JP7186932B2 - Waveguide mode measuring device, waveguide mode measuring method, and waveguide system - Google Patents

Description

The present disclosure relates to a waveguide mode measurement device, a waveguide mode measurement method, and a waveguide system.

As a method for measuring the amplitude of each electromagnetic wave in a plurality of waveguide modes possessed by a circular waveguide, a horn antenna is used to radiate the electromagnetic wave in the waveguide mode into space, and the electromagnetic wave in the space is measured. There is a method of measuring the amplitude of each electromagnetic wave by analyzing the radiation pattern (hereinafter referred to as "conventional waveguide mode measuring method").

By the way, by connecting a plurality of coaxial cables around a circular waveguide, there is a power divider that enables extraction of TM01 mode electromagnetic waves possessed by the circular waveguide from each coaxial cable. (See, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2016-040900

In the conventional waveguide mode measurement method, depending on the power of the electromagnetic waves in the circular waveguide, the electromagnetic waves radiated into the space may have adverse effects such as electromagnetic interference on the peripheral devices of the circular waveguide. be. In order to suppress adverse effects on peripheral devices, it may be necessary to stop the emission of electromagnetic waves into space. The conventional waveguide mode measurement method has a problem that the amplitude of the electromagnetic wave cannot be measured if the radiation of the electromagnetic wave to the space is stopped.
Even if the power divider disclosed in Patent Document 1 is applied to a conventional waveguide mode measuring device, it is not possible to suppress adverse effects on peripheral devices, so the above problem cannot be solved.

The present disclosure has been made to solve the problems described above, and is a waveguide mode measuring device and a waveguide mode measuring device capable of measuring the amplitude of an electromagnetic wave without radiating the electromagnetic wave in a circular waveguide into space. The objective is to obtain a wave tube mode measurement method.

A waveguide mode measuring apparatus according to the present disclosure measures the amplitude of a TM01 mode electromagnetic wave propagating through a circular waveguide having a waveguide wall or a TE11 mode electromagnetic wave propagating through a circular waveguide. A measuring device for obtaining measurements of the voltage appearing at each probe from a measuring instrument connected to the ends of a plurality of probes inserted into respective ones of a plurality of holes through the pipe wall. Calculate the amplitude of the electromagnetic wave in the TM01 mode from the measured value acquisition unit, the average value calculation unit that calculates the average value of the plurality of measured values acquired by the measured value acquisition unit, and the average value calculated by the average value calculation unit Subtracting the average value calculated by the average value calculation unit from each measurement value acquired by the first amplitude calculation processing unit or the measurement value acquisition unit, and weighting the plurality of measurement values after the average value subtraction Among the second amplitude calculation processing units that calculate the average value and calculate the amplitude of the electromagnetic wave in the TE11 mode from the weighted average value, the amplitude calculation unit includes one or more amplitude calculation processing units.

According to the present disclosure, the amplitude of electromagnetic waves can be measured without radiating the electromagnetic waves in the circular waveguide into space.

1 is a configuration diagram showing a waveguide system according to Embodiment 1; FIG. 1 is a perspective view showing waveguide device 1 according to Embodiment 1. FIG. 1 is a side view showing waveguide device 1 according to Embodiment 1. FIG. 1 is a cross-sectional view showing waveguide device 1 according to Embodiment 1. FIG. 2 is an enlarged view showing a main part of waveguide device 1 according to Embodiment 1. FIG. 1 is a configuration diagram showing a waveguide mode measuring device 5 according to Embodiment 1. FIG. 2 is a hardware configuration diagram showing hardware of the waveguide mode measuring device 5 according to Embodiment 1. FIG. 2 is a hardware configuration diagram of a computer when the waveguide mode measuring device 5 is implemented by software, firmware, or the like; FIG. 9A is an explanatory diagram showing the electric field and magnetic field of the electromagnetic wave in the TE11A mode, FIG. 9B is an explanatory diagram showing the electric field and magnetic field of the electromagnetic wave in the TE11B mode, and FIG. 9C is the electric field and magnetic field of the electromagnetic wave in the TM01 mode. FIG. 2 is an explanatory diagram showing each of 5 is a flow chart showing a waveguide mode measuring method, which is a processing procedure of the waveguide mode measuring device 5. FIG. FIG. 10 is a configuration diagram showing a waveguide system according to Embodiment 2; FIG. 11 is a side view showing the waveguide device 1 according to Embodiment 2; FIG. 5 is a cross-sectional view showing a waveguide device 1 according to Embodiment 2;

Hereinafter, in order to describe the present disclosure in more detail, embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings.

Embodiment 1.
FIG. 1 is a configuration diagram showing a waveguide system according to Embodiment 1. FIG.
The waveguide system shown in FIG. 1 includes a waveguide device 1 , a measuring device 4 and a waveguide mode measuring device 5 .
A waveguide device 1 includes circular waveguides 2 and 2 n-th power probes 3 . n is an integer of 2 or more.
In the waveguide system shown in FIG. 1, n=3, and the waveguide device 1 includes 2 to the power of 3 (=8) probes 3-1 to 3-8. Hereinafter, when the probes 3-1 to 3-8 are not distinguished, they may be referred to as probe 3.
The circular waveguide 2 has TM01 mode and TE11 mode as waveguide modes.
The circular waveguide 2 shown in FIG. 1 only needs to have the TM01 mode and the TE11 mode, and may further have a waveguide mode different from the TM01 mode and the TE11 mode.

2 is a perspective view showing the waveguide device 1 according to Embodiment 1, FIG. 3 is a side view showing the waveguide device 1 according to Embodiment 1, and FIG. 1 is a cross-sectional view showing a waveguide device 1 according to form 1. FIG.
FIG. 5 is an enlarged view showing a main part of the waveguide device 1 according to Embodiment 1. FIG.
The circular waveguide 2 has a pipe wall 2a, and the pipe wall 2a is provided with a plurality of holes 2b as through holes.
The number of holes 2b is 2n, and 2n holes 2b are arranged in the circumferential direction of the pipe wall 2a at intervals of 45 degrees. In the waveguide system shown in FIG. 1, n=3 and the number of holes 2b is 2@3 (=8).
As the plurality of probes 3, 2 n probes 3 are arranged in the circumferential direction of the pipe wall 2a at intervals of 45 degrees.
In the waveguide system shown in FIG. 1, n=3, and eight probes 3-1 to 3-8 are arranged at intervals of 45 degrees in the circumferential direction of the tube wall 2a.
Probe 3-1 is the first probe, probe 3-2 is the second probe, probe 3-3 is the third probe, and probe 3-4 is the fourth probe.
Probe 3-5 is the fifth probe, probe 3-6 is the sixth probe, probe 3-7 is the seventh probe, and probe 3-8 is the eighth probe.

The probes 3-m (m=1, 2, . . . , 8) are realized by coaxial lines, for example.
When the probe 3-m is implemented by a coaxial line, the probe 3-m has an inner conductor 3a of the coaxial line.
One end of the probe 3-m is inserted into a hole 2b penetrating the wall 2a of the circular waveguide 2. As shown in FIG.
The other end of the probe 3-m is connected to the measuring device 4. FIG.
When the probe 3-m is realized by a coaxial line, the inner conductor 3a of the coaxial line is inserted into the hole 2b as shown in FIG.
In FIG. 5, the inner conductor 3a of the coaxial line is inserted into the hole 2b, and the tip of the inner conductor 3a remains at the position of the hole 2b. However, this is only an example, and the tip of the inner conductor 3a may be inserted into the circular waveguide 2 through the hole 2b.
In the waveguide system shown in FIG. 1, it is assumed that probes 3 having the same shape are used as the eight probes 3-1 to 3-8. However, this is only an example, and probes 3 having different shapes may be used as the probes 3-1 to 3-8.
In the waveguide system shown in FIG. 1, probe 3-m is realized by a coaxial line. However, this is only an example, and probe 3-m may be realized by, for example, a rectangular waveguide.

Measuring device 4 is implemented by, for example, an oscilloscope.
The measuring device 4 is connected to the other ends of the probes 3-1 to 3-8.
A measuring device 4 measures the voltage appearing at each probe 3-m.
The measuring device 4 outputs to the waveguide mode measuring device 5 measurement information indicating the measured values Pm (m=1, 2, . . . , 8) of the respective voltages.

The waveguide mode measuring device 5 includes a measured value acquiring section 11, an average value calculating section 12, and an amplitude calculating section 13, as shown in FIG.
The waveguide mode measuring device 5 calculates the amplitude of the electromagnetic wave in the TM01 mode and the amplitude of the electromagnetic wave in the TE11 mode.

FIG. 6 is a configuration diagram showing a waveguide mode measuring device 5 according to Embodiment 1. As shown in FIG.
FIG. 7 is a hardware configuration diagram showing hardware of the waveguide mode measuring device 5 according to the first embodiment.
The measured value acquisition unit 11 is implemented by, for example, a measured value acquisition circuit 21 shown in FIG.
The measured value acquisition unit 11 acquires from the measuring device 4 measurement information indicating the measured value Pm of the voltage appearing at each probe 3-m (m=1, 2, . . . , 8).
The measured value acquisition unit 11 outputs measurement information to the average value calculation unit 12 and the amplitude calculation unit 13, respectively.

The average value calculator 12 is implemented by, for example, an average value calculator circuit 22 shown in FIG.
The average value calculator 12 calculates an average value P _ave of the measured values P1 to P8 acquired by the measured value acquirer 11 .
The average value calculator 12 outputs the average value P _ave to the amplitude calculation processor 13 .

The amplitude calculator 13 includes a first amplitude calculator 14 and a second amplitude calculator 15 .
The amplitude calculator 13 calculates the amplitude Amp ₁ of the electromagnetic wave in the TM01 mode and the amplitudes Amp _2A and Amp _2B of the electromagnetic waves in the TE11 mode.
In the waveguide system shown in FIG. 1, the amplitude calculator 13 includes a first amplitude calculator 14 and a second amplitude calculator 15 . However, even if the amplitude calculator 13 calculates the amplitude of the electromagnetic wave in one of the amplitude Amp ₁ of the electromagnetic wave in the TM01 mode and the amplitudes Amp _2A and Amp _2B of the electromagnetic wave in the TE11 mode, good. When calculating the amplitude of the electromagnetic wave in any one mode, the amplitude calculation unit 13 may include either the first amplitude calculation processing unit 14 or the second amplitude calculation processing unit 15. .

The first amplitude calculation processing section 14 is realized by, for example, the first amplitude calculation circuit 23 shown in FIG.
The first amplitude calculation processing section 14 calculates the amplitude Amp ₁ of the electromagnetic wave in the TM01 mode from the average value P _ave calculated by the average value calculation section 12 .
The second amplitude calculation processing section 15 is realized by, for example, the second amplitude calculation circuit 24 shown in FIG.
The second amplitude calculation processing unit 15 subtracts the average value P _ave calculated by the average value calculation unit 12 from each measurement value Pm acquired by the measurement value acquisition unit 11, thereby obtaining Measured value Pm' is calculated.
The second amplitude calculation processing unit 15 calculates a weighted average value of the plurality of measured values Pm′ after subtracting the average value, and calculates the amplitudes Amp _2A and Amp _2B of the electromagnetic waves in the TE11 mode from the weighted average value.

In FIG. 6, each of the measured value acquisition unit 11, the average value calculation unit 12, the first amplitude calculation processing unit 14, and the second amplitude calculation processing unit 15, which are components of the waveguide mode measurement device 5, is shown in FIG. 7 is assumed to be realized by dedicated hardware. That is, it is assumed that the waveguide mode measuring device 5 is implemented by a measured value acquisition circuit 21, an average value calculation circuit 22, a first amplitude calculation circuit 23 and a second amplitude calculation circuit 24. FIG.
Each of the measured value acquisition circuit 21, the average value calculation circuit 22, the first amplitude calculation circuit 23, and the second amplitude calculation circuit 24 is, for example, a single circuit, a composite circuit, a programmed processor, or a parallel programmed processor. , ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or a combination thereof.

The components of the waveguide mode measurement device 5 are not limited to those realized by dedicated hardware, and the waveguide mode measurement device 5 is realized by software, firmware, or a combination of software and firmware. It may be
Software or firmware is stored as a program in a computer's memory. A computer means hardware that executes a program, for example, a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, a processor, or a DSP (Digital Signal Processor). do.

FIG. 8 is a hardware configuration diagram of a computer when the waveguide mode measuring device 5 is implemented by software, firmware, or the like.
When the waveguide mode measuring device 5 is implemented by software, firmware, or the like, each of A memory 31 stores a program for causing a computer to execute the processing procedure of . Then, the processor 32 of the computer executes the program stored in the memory 31 .

7 shows an example in which each component of the waveguide mode measurement device 5 is implemented by dedicated hardware, and FIG. 8 shows an example in which the waveguide mode measurement device 5 is implemented by software, firmware, or the like. example. However, this is only an example, and some components in the waveguide mode measurement device 5 may be implemented by dedicated hardware, and the remaining components may be implemented by software, firmware, or the like. .

The circular waveguide 2 has at least TM01 mode and TE11 mode as waveguide modes.
Electromagnetic waves in the TE11 mode have a first polarization and a second polarization that is orthogonal to the first polarization. The first polarization is, for example, vertical polarization in the vertical direction as shown in FIG. 9A, and the second polarization is horizontal polarization in the horizontal direction, for example, as shown in FIG. 9B.
Hereinafter, vertically polarized waves in the vertical direction as shown in FIG. 9A are referred to as electromagnetic waves in the TE11A mode. Further, the laterally horizontally polarized wave as shown in FIG. 9B is called an electromagnetic wave in the TE11B mode.
Among the electromagnetic waves in the TE11 mode, even polarized waves having an arbitrary tilt angle can be included in either the TE11A mode or the TE11B mode.
FIG. 9A is an explanatory diagram showing the electric field and magnetic field of the electromagnetic wave in the TE11A mode, and FIG. 9B is an explanatory diagram showing the electric field and magnetic field of the electromagnetic wave in the TE11B mode.
FIG. 9C is an explanatory diagram showing each of the electric field and magnetic field of electromagnetic waves in the TM01 mode.
In the waveguide system shown in FIG. 1, vertical polarization in the vertical direction and horizontal polarization in the horizontal direction are defined as follows.
The vertically polarized wave in the longitudinal direction is the polarized wave in the direction of φ=0 [deg], which is the direction from the center of the circular waveguide 2 to the probe 3-1 in FIG.
The horizontally polarized wave in the horizontal direction is the polarized wave in the direction of φ=90 [deg], which is the direction from the center of the circular waveguide 2 to the probe 3-3 in FIG.

On the tube wall 2a of the circular waveguide 2, eight probes 3-1 to 3-8 are arranged circumferentially at intervals of 45 degrees.
The probe 3-1 is arranged in the φ=0 [deg] direction, and the measured value of the voltage appearing on the probe 3-1 is P1.
The probe 3-2 is arranged in the direction of φ=45 [deg], and the measured value of the voltage appearing on the probe 3-2 is P2.
The probe 3-3 is arranged in the direction of φ=90 [deg], and the measured value of the voltage appearing on the probe 3-3 is P3.
The probe 3-4 is arranged in the direction of φ=135 [deg], and the measured value of the voltage appearing on the probe 3-4 is P4.
The probe 3-5 is arranged in the φ=180 [deg] direction, and the measured value of the voltage appearing on the probe 3-5 is P5.
The probe 3-6 is arranged in the direction of φ=225 [deg], and the measured value of the voltage appearing on the probe 3-6 is P6.
The probe 3-7 is arranged in the φ=270 [deg] direction, and the measured value of the voltage appearing on the probe 3-7 is P7.
The probe 3-8 is arranged in the φ=315 [deg] direction, and the measured value of the voltage appearing on the probe 3-8 is P8.

The relative amount of electromagnetic waves coupled to each probe 3-m (m=1, 2, . . . , 8) is as follows. The amount of coupling is represented by the amplitude of the electromagnetic wave coupled with the probe 3-m and the phase of the electromagnetic wave coupled with the probe 3-m.
In the TM01 mode, the amplitude of the electromagnetic waves coupled to each probe 3-m (m=1, 2, . . . , 8) is the same amplitude, and the phase of the electromagnetic waves coupled to each probe 3-m is , have the same phase.

In the TE11A mode, the amplitude of the electromagnetic wave coupled to each of the probes 3-1 and 3-5 is the amplitude of the electromagnetic wave coupled to each of the other probes 3-2 to 3-4 and 3-6 to 3-8. Amplitude and maximum amplitude. The phase of the electromagnetic wave coupled to the probe 3-1 and the phase of the electromagnetic wave coupled to the probe 3-5 are opposite in phase. The amplitude of the electromagnetic waves coupled to each of the probes 3-2 and 3-6 is -3 [dB] below the maximum amplitude. The phase of the electromagnetic wave coupled with the probe 3-2 and the phase of the electromagnetic wave coupled with the probe 3-6 are opposite in phase. The amplitude of the electromagnetic waves coupled to each of the probes 3-4 and 3-8 is -3 [dB] below the maximum amplitude. The phase of the electromagnetic wave coupled with the probe 3-4 and the phase of the electromagnetic wave coupled with the probe 3-8 are opposite in phase. Almost no electromagnetic waves are coupled to each of the probes 3-3 and 3-7.

In the TE11B mode, the amplitude of the electromagnetic wave coupled to each of the probes 3-3 and 3-7 is coupled to each of the other probes 3-1, 3-2, 3-4 to 3-6, 3-8. is larger than the amplitude of the electromagnetic wave that is applied, and becomes the maximum amplitude. The phase of the electromagnetic wave coupled with the probe 3-3 and the phase of the electromagnetic wave coupled with the probe 3-7 are opposite in phase. The amplitude of the electromagnetic waves coupled to each of the probes 3-2 and 3-6 is -3 [dB] below the maximum amplitude. The phase of the electromagnetic wave coupled with the probe 3-2 and the phase of the electromagnetic wave coupled with the probe 3-6 are opposite in phase. The amplitude of the electromagnetic waves coupled to each of the probes 3-4 and 3-8 is -3 [dB] below the maximum amplitude. The phase of the electromagnetic wave coupled with the probe 3-4 and the phase of the electromagnetic wave coupled with the probe 3-8 are opposite in phase. Almost no electromagnetic waves are coupled to each of the probes 3-1 and 3-5.

If the probes 3-1 to 3-8 have the same shape, the amount of electromagnetic waves coupled to each probe 3-m will be the relative amount of coupling as described above.
For example, if the probes 3-1 to 3-8 have the same shape, a computer (not shown) can determine from the relative amount of electromagnetic wave coupling to each probe 3-m the TM01 mode for all the probes 3. , the coupling amount B _TE11A in the TE11A mode for all the probes 3, and the coupling _amount B _TE11B in the TE11B mode for all the probes 3 are calculated. Calculation processing for each of the coupling amount B _TM01 , the coupling amount B _TE11A , and the coupling amount B _TE11B is a known technique, and detailed description thereof will be omitted.
Depending on the shape of each probe 3-m, the amount of electromagnetic waves coupled to each probe 3-m differs. If the probes 3-1 to 3-8 have different shapes, for example, a computer (not shown) performs electromagnetic field analysis or the like to determine the amount of coupling B _TM01 in the TM01 mode and the coupling in the TE11A mode. Quantity B _TE11A and the coupling quantity B _TE11B in the TE11B mode are calculated respectively.
The coupling amount B _TM01 is stored in the internal memory of the first amplitude calculation processing section 14, and the coupling amount B _TE11A and the coupling amount B _TE11B are stored in the internal memory of the second amplitude calculation processing section 15, respectively.

Next, the operation of the waveguide system shown in FIG. 1 will be described.
FIG. 10 is a flow chart showing a waveguide mode measuring method, which is a processing procedure of the waveguide mode measuring device 5. As shown in FIG.
The measuring device 4 measures the voltage appearing on each probe 3-m (m=1, 2, . . . , 8) as a time waveform.
The measuring device 4 outputs to the waveguide mode measuring device 5 measurement information indicating the measured values Pm (m=1, 2, . . . , 8) of the respective voltages.

The measured value acquiring unit 11 of the waveguide mode measuring device 5 acquires measured information indicating the measured value Pm of the voltage appearing in each probe 3-m from the measuring device 4 (step ST1 in FIG. 10).
The measured value acquisition section 11 outputs the measurement information to the average value calculation section 12 and the second amplitude calculation processing section 15, respectively.

平均値算出部１２は、平均値Ｐ_ａｖｅを第１の振幅算出処理部１４及び第２の振幅算出処理部１５のそれぞれに出力する。The average value calculator 12 acquires measurement information from the measured value acquirer 11 .
The average value calculator 12 calculates the average value P _ave of the measured values P1 to P8 indicated by the measurement information, as shown in the following equation (1) (step ST2 in FIG. 10).

The average value calculator 12 outputs the average value P _ave to each of the first amplitude calculation processor 14 and the second amplitude calculation processor 15 .

The first amplitude calculation processing section 14 acquires the average value P _ave from the average value calculation section 12 .
The first amplitude calculation processing unit 14 adds the coupling amount B _TM01 in the TM01 mode stored in the internal memory to the average value P _ave to obtain The amplitude Amp ₁ of the electromagnetic wave is calculated (step ST3 in FIG. 10).
Amp ₁ =P _ave +B _TM01 (2)
The first amplitude calculation processing unit 14 outputs the amplitude Amp ₁ of the electromagnetic waves in the TM01 mode to, for example, an external device (not shown) that uses electromagnetic waves in the TM01 mode.

The second amplitude calculation processing section 15 acquires the measurement information from the measurement value acquisition section 11 and acquires the average value P _ave from the average value calculation section 12 .
The second amplitude calculation processing unit 15 calculates the average value P _ave from each measured value Pm (m=1, 2, . By subtracting, the measured value Pm' after the mean value subtraction is calculated (step ST4 in FIG. 10).
Pm′=Pm−P _ave (3)

ｋは、係数であり、ｋ＝√２であれば、ｋをデシベル換算すると、３［ｄＢ］に相当する。The second amplitude calculation processing unit 15 calculates a measured value P1′, a measured value P2′, a measured value P4′, a measured value P5′, a measured value P6′, and a measured value P8′ as shown in the following equation (4). is calculated as the first weighted average value WP _ave1 (step ST5 in FIG. 10).

k is a coefficient, and if k=√2, k is equivalent to 3 [dB] when converted to decibels.

The second amplitude calculation processing unit 15 calculates a measured value P2', a measured value P3', a measured value P4', a measured value P6', a measured value P7', and a measured value P8' as shown in the following equation (5). is calculated as the second weighted average value WP _ave2 (step ST6 in FIG. 10).

The second amplitude calculation processing unit 15 adds the coupling amount B _TE11A in the TE11A mode stored in the internal memory to the first weighted average value WP _ave1 as shown in the following equation (6). , the amplitude Amp _2A of the electromagnetic wave in TE11 mode A is calculated (step ST7 in FIG. 10).
Amp _2A = WP _ave1 + B _TE11A (6)

The second amplitude calculation processing unit 15 adds the coupling amount B _TE11B in the TE11B mode stored in the internal memory to the second weighted average value WP _ave2 as shown in the following equation (7). , and the amplitude Amp _2B of the electromagnetic wave in the TE11B mode (step ST8 in FIG. 10).
Amp _2B = WP _ave2 + B _TE11B (7)
The second amplitude calculation processing unit 15 calculates each of the amplitude Amp _2A of the electromagnetic wave in the TE11A mode and the amplitude Amp _2B of the electromagnetic wave in the TE11B mode, for example, an external device ( (not shown).

In the first embodiment described above, waveguide mode measurement for measuring the amplitude of the TM01 mode electromagnetic wave propagating in the circular waveguide 2 having the pipe wall 2a or the TE11 mode electromagnetic wave propagating in the circular waveguide 2 A device 5 measuring the voltage appearing at each probe 3 from a measuring device 4 connected to the ends of a plurality of probes 3 inserted in each of a plurality of holes 2b penetrating the tube wall 2a. A measured value acquisition unit 11 that acquires measured values, an average value calculation unit 12 that calculates the average value of the plurality of measured values acquired by the measured value acquisition unit 11, and the average value calculated by the average value calculation unit 12 , subtracting the average value calculated by the average value calculation unit 12 from the first amplitude calculation processing unit 14 for calculating the amplitude of the electromagnetic wave in the TM01 mode or the measurement value acquired by the measurement value acquisition unit 11 , one or more amplitude calculation processing out of the second amplitude calculation processing unit 15 that calculates a weighted average value of a plurality of measured values after subtraction of the average value, and calculates the amplitude of the electromagnetic wave in the TE11 mode from the weighted average value and an amplitude calculator 13 having a section. Therefore, the waveguide mode measuring device 5 can measure the amplitude of the electromagnetic wave without radiating the electromagnetic wave in the circular waveguide 2 into space.

The circular waveguide 2 shown in FIG. 1 has TM01 mode and TE11 mode as waveguide modes. The circular waveguide 2 shown in FIG. 1 may have, for example, a TE21 mode as a waveguide mode in addition to the TM01 mode and the TE11 mode.
When the circular waveguide 2 shown in FIG. 1 has the TE21 mode, in the TE21 mode, the phases of the electromagnetic waves coupled to the two probes 3 arranged at opposing positions are in phase. Become. Also, the phase of the electromagnetic wave coupled to a certain probe 3 is in phase with the phase of the electromagnetic wave coupled to the probe 3 arranged at a position shifted by 90 degrees from the certain probe 3 . In the TE21 mode, the average value P _ave of the measured values P1 to P8 is 0, so that the circular waveguide 2 has the TE21 mode is the amplitude of the electromagnetic wave in the TM01 mode calculated from the average value P _ave Does not affect Amp ₁ .
In addition, in the TE21 mode, the phases of the electromagnetic waves coupled to the two probes 3 arranged at positions facing each other are in phase, so that the circular waveguide 2 has the TE21 mode. , and the calculation of the amplitudes Amp _2A and Amp _2b of the electromagnetic waves in the TE11 mode.

In the waveguide device 1 shown in FIG. 1, eight probes 3-1 to 3-8 are arranged in a line at intervals of 45 degrees in the circumferential direction of the pipe wall 2a. However, the value of the coefficient k included in each of the equations (4) and (5) may be changed according to the spacing between the probes, and the eight probes 3-1 to 3-8 are , need not be evenly spaced at 45 degree intervals. However, the four coefficients k included in each of equations (4) and (5) are set to different values as k1, k2, k3, and k4 according to the spacing between the probes. There is a need.
Also, the probes 3-1 to 3-8 do not have to be arranged in a line in the circumferential direction of the tube wall 2a.

Embodiment 2.
In Embodiment 2, n=2, and 4 (=2 ² ) probes 3 are arranged in the circumferential direction of the pipe wall 2a of the circular waveguide 2 at intervals of 45 degrees. will be explained.

FIG. 11 is a configuration diagram showing a waveguide system according to Embodiment 2. FIG.
12 is a side view showing the waveguide device 1 according to Embodiment 2, and FIG. 13 is a cross-sectional view showing the waveguide device 1 according to Embodiment 2. FIG.
In FIGS. 11 to 13, the same reference numerals as those in FIGS. 1 to 5 denote the same or corresponding parts, so description thereof will be omitted.
Probe 3-1 is the first probe, probe 3-2 is the second probe, probe 3-3 is the third probe, and probe 3-4 is the fourth probe.

The probe 3-1 is arranged in the φ=0 [deg] direction, and the measured value of the voltage appearing on the probe 3-1 is P1.
The probe 3-2 is arranged in the direction of φ=45 [deg], and the measured value of the voltage appearing on the probe 3-2 is P2.
The probe 3-3 is arranged in the direction of φ=90 [deg], and the measured value of the voltage appearing on the probe 3-3 is P3.
The probe 3-4 is arranged in the direction of φ=135 [deg], and the measured value of the voltage appearing on the probe 3-4 is P4.

The configuration of the waveguide mode measuring device 5 according to Embodiment 2 is the same as the configuration of the waveguide mode measuring device 5 according to Embodiment 1, and the waveguide mode measuring device 5 according to Embodiment 2 A configuration diagram showing the is shown in FIG.
In the waveguide system shown in FIG. 11, the amplitude calculator 13 includes a first amplitude calculator 14 and a second amplitude calculator 15 . However, even if the amplitude calculator 13 calculates the amplitude of the electromagnetic wave in one of the amplitude Amp ₁ of the electromagnetic wave in the TM01 mode and the amplitudes Amp _2A and Amp _2B of the electromagnetic wave in the TE11 mode, good. When calculating the amplitude of the electromagnetic wave in any one mode, the amplitude calculation unit 13 may include either the first amplitude calculation processing unit 14 or the second amplitude calculation processing unit 15. .

Next, the operation of the waveguide system shown in FIG. 11 will be described.
The measuring device 4 measures the voltage appearing on each probe 3-m (m=1, 2, 3, 4) as a time waveform.
The measuring device 4 outputs to the waveguide mode measuring device 5 measurement information indicating the measured values Pm (m=1, 2, 3, 4) of the respective voltages.

The measured value acquisition unit 11 of the waveguide mode measuring device 5 acquires from the measuring device 4 measurement information indicating the measured value Pm of the voltage appearing at each probe 3-m.
The measured value acquisition section 11 outputs the measurement information to the average value calculation section 12 and the second amplitude calculation processing section 15, respectively.

平均値算出部１２は、平均値Ｐ_ａｖｅを第１の振幅算出処理部１４及び第２の振幅算出処理部１５のそれぞれに出力する。The average value calculator 12 acquires measurement information from the measured value acquirer 11 .
The average value calculator 12 calculates an average value P _ave of the measured values P1 to P4 indicated by the measurement information, as shown in the following equation (8).

The average value calculator 12 outputs the average value P _ave to each of the first amplitude calculation processor 14 and the second amplitude calculation processor 15 .

The first amplitude calculation processing section 14 acquires the average value P _ave from the average value calculation section 12 .
The first amplitude calculation processing unit 14 adds the coupling amount B _TM01 in the TM01 mode stored in the internal memory to the average value P _ave as shown in the following equation (9), thereby obtaining Calculate the amplitude Amp ₁ of the electromagnetic wave.
Amp ₁ =P _ave +B _TM01 (9)
The first amplitude calculation processing unit 14 outputs the amplitude Amp ₁ of the electromagnetic waves in the TM01 mode to, for example, an external device (not shown) that uses electromagnetic waves in the TM01 mode.

The second amplitude calculation processing section 15 acquires the measurement information from the measurement value acquisition section 11 and acquires the average value P _ave from the average value calculation section 12 .
The second amplitude calculation processing unit 15 subtracts the average value P _ave from each measured value Pm (m=1, 2, 3, 4) indicated by the measurement information, as shown in the following equation (10). Thus, the measured value Pm' after subtraction of the average value is calculated.
Pm′=Pm−P _ave (10)

The second amplitude calculation processing unit 15 calculates the weighted average value of the measured value P1', the measured value P2', and the measured value P4' as the first weighted average value WP _ave1 as shown in the following equation (11). do.

The second amplitude calculation processing unit 15 calculates the weighted average value of the measured value P2', the measured value P3', and the measured value P4' as the second weighted average value WP _ave2 as shown in the following equation (12). do.

The second amplitude calculation processing unit 15 adds the coupling amount B _TE11A in the TE11A mode stored in the internal memory to the first weighted average value WP _ave1 as shown in the following equation (13). , the amplitude Amp _2A of the electromagnetic wave in the TE11 mode.
Amp _2A = WP _ave1 + B _TE11A (13)

The second amplitude calculation processing unit 15 adds the coupling amount B _TE11B in the TE11B mode stored in the internal memory to the second weighted average value WP _ave2 as shown in the following equation (14). , the amplitude Amp _2B of the electromagnetic wave in the TE11B mode.
Amp _2B = WP _ave2 + B _TE11B (14)
The second amplitude calculation processing unit 15 calculates each of the amplitude Amp _2A of the electromagnetic wave in the TE11A mode and the amplitude Amp _2B of the electromagnetic wave in the TE11B mode, for example, an external device ( (not shown).

In the second embodiment described above, the waveguide mode measuring device 5 in which 4 (=2 ² ) probes 3 are arranged at intervals of 45 degrees in the circumferential direction of the pipe wall 2a of the circular waveguide 2 is used. Configured. Even when the four probes 3 are arranged at intervals of 45 degrees in the circumferential direction of the pipe wall 2a of the circular waveguide 2, the waveguide mode measuring device 5 can measure the electromagnetic waves in the circular waveguide 2. The amplitude of electromagnetic waves can be measured without being radiated into space.
When four probes 3 are arranged at intervals of 45 degrees in the circumferential direction of the wall 2a of the circular waveguide 2, eight probes 3 are arranged along the circumference of the wall 2a of the circular waveguide 2. The electromagnetic wave amplitude calculation process in the amplitude calculator 13 of the waveguide mode measuring device 5 can be reduced compared to the case where they are arranged at intervals of 45 degrees in the direction.

In the waveguide system shown in FIGS. 1 and 11, the number of probes 3 inserted into the holes 2b of the pipe wall 2a is 2@n. However, by changing the value of the coefficient k included in each of the equations (4) and (5) or the value of the coefficient k included in each of the equations (11) and (12), weighting If the average calculation formula is changed, the number of probes 3 inserted into the holes 2b of the pipe wall 2a does not have to be 2 to the nth power.
However, for example, the four coefficients k included in each of equations (4) and (5) are set to different k according to the number of probes 3 and the position of each probe 3, and the number of probes 3 and depending on the position of each probe 3, different values of k should be set.

It should be noted that the present disclosure allows free combination of each embodiment, modification of arbitrary constituent elements of each embodiment, or omission of arbitrary constituent elements in each embodiment.

The present disclosure is suitable for waveguide mode measurement apparatus and waveguide mode measurement methods.
The present disclosure is suitable for waveguide systems including waveguide devices and waveguide mode measurement devices.
The present disclosure is suitable for waveguide devices.

1 waveguide device, 2 circular waveguide, 2a pipe wall, 2b hole, 3, 3-1 to 3-8 probe, 3a inner conductor, 4 measuring device, 5 waveguide mode measuring device, 11 measurement value acquisition 12 average value calculation unit 13 amplitude calculation unit 14 first amplitude calculation processing unit 15 second amplitude calculation processing unit 21 measured value acquisition circuit 22 average value calculation circuit 23 first amplitude calculation circuit , 24 second amplitude calculation circuit, 31 memory, 32 processor.

Claims (10)

A waveguide mode measuring device for measuring the amplitude of a TM01 mode electromagnetic wave propagating in a circular waveguide having a waveguide wall or a TE11 mode electromagnetic wave propagating in the circular waveguide,
a measurement value acquisition unit that acquires measurement values of voltages appearing in each of the probes from a measuring device connected to ends of the plurality of probes inserted into each of the plurality of holes penetrating the tube wall; ,
an average value calculation unit that calculates an average value of the plurality of measured values acquired by the measured value acquisition unit;
A first amplitude calculation processing unit that calculates the amplitude of the electromagnetic wave in the TM01 mode from the average value calculated by the average value calculation unit, or from each measurement value acquired by the measurement value acquisition unit, the average A second amplitude for subtracting the average value calculated by the value calculating unit, calculating a weighted average value of a plurality of measured values after subtracting the average value, and calculating the amplitude of the electromagnetic wave in the TE11 mode from the weighted average value A waveguide mode measurement apparatus comprising: an amplitude calculation unit including one or more amplitude calculation processing units among the calculation processing units. As the plurality of probes, 2 n (n is an integer of 2 or more) power probes are arranged in the circumferential direction of the pipe wall at intervals of 45 degrees,
2. The waveguide mode measuring apparatus according to claim 1, wherein said measured value acquiring unit acquires measured values of voltages appearing at respective probes from said measuring device. n = 3, and as 2 3 probes, the first probe, the second probe, the third probe, the fourth probe, the fifth probe, the sixth probe, the seventh probe and eighth probes are arranged in the circumferential direction at intervals of 45 degrees;
P1 is the measured value of the voltage appearing at the first probe, P2 is the measured value of the voltage appearing at the second probe, P3 is the measured value of the voltage appearing at the third probe, and P3 is the measured value of the voltage appearing at the third probe. P4 is the measured value of the voltage appearing at the probe No. 4, P5 is the measured value of the voltage appearing at the fifth probe, P6 is the measured value of the voltage appearing at the sixth probe, and P6 is the measured value of the voltage appearing at the seventh probe. When the measured value of the voltage appearing at the probe is P7 and the measured value of the voltage appearing at the eighth probe is P8,
The average value calculation unit
3. The waveguide according to claim 2, wherein an average value of said P1, said P2, said P3, said P4, said P5, said P6, said P7 and said P8 is calculated. Modal measuring device. The first amplitude calculation processing unit,
4. The waveguide mode measuring apparatus according to claim 3, wherein the amplitude of the electromagnetic wave in said TM01 mode is calculated from the average value calculated by said average value calculating section. The second amplitude calculation processing unit,
By subtracting the average value calculated by the average value calculating unit from each of P1, P2, P3, P4, P5, P6, P7 and P8, Calculate each of P3', P4', P5', P6', P7' and P8',
Calculate the weighted average value of the P1 ', the P2 ', the P4 ', the P5 ', the P6 ' and the P8 ' as a first weighted average value,
Calculate a weighted average value of the P2', the P3', the P4', the P6', the P7' and the P8' as a second weighted average value;
From the first weighted average, calculate the amplitude of the first polarization in the TE11 mode; from the second weighted average, calculate the amplitude of the first polarization in the TE11 mode, which is orthogonal to the first polarization 4. The waveguide mode measuring apparatus according to claim 3, wherein the amplitude of two polarized waves is calculated. n=2, and the first probe, second probe, third probe and fourth probe are arranged at intervals of 45 degrees in the circumferential direction of the pipe wall as 2 squared probes and
P1 is the measured value of the voltage appearing at the first probe, P2 is the measured value of the voltage appearing at the second probe, P3 is the measured value of the voltage appearing at the third probe, and P3 is the measured value of the voltage appearing at the third probe. When the measured value of the voltage appearing at probe 4 is P4,
The average value calculation unit
3. The waveguide mode measuring apparatus according to claim 2, wherein an average value of said P1, said P2, said P3 and said P4 is calculated. The first amplitude calculation processing unit,
7. The waveguide mode measuring apparatus according to claim 6, wherein the amplitude of the electromagnetic wave in said TM01 mode is calculated from the average value calculated by said average value calculating section. The second amplitude calculation processing unit,
Calculate P1′, P2′, P3′ and P4′ by subtracting the average value calculated by the average value calculating unit from each of P1, P2, P3 and P4,
Calculate the weighted average value of the P1 ', the P2 ' and the P4 ' as a first weighted average value,
Calculate the weighted average value of the P2 ', the P3 ' and the P4 ' as a second weighted average value,
From the first weighted average, calculate the amplitude of the first polarization in the TE11 mode; from the second weighted average, calculate the amplitude of the first polarization in the TE11 mode, which is orthogonal to the first polarization 7. The waveguide mode measuring apparatus according to claim 6, wherein amplitudes of two polarized waves are calculated. A waveguide mode measurement method for measuring the amplitude of a TM01 mode electromagnetic wave propagating in a circular waveguide having a waveguide wall or a TE11 mode electromagnetic wave propagating in the circular waveguide, comprising:
A measurement value acquisition unit acquires measurement values of the voltage appearing in each probe from a measuring device connected to ends of a plurality of probes inserted into each of the plurality of holes penetrating the pipe wall. death,
An average value calculating unit calculates an average value of the plurality of measured values acquired by the measured value acquiring unit,
Amplitude calculation processing in which the amplitude calculation unit calculates the amplitude of the electromagnetic wave in the TM01 mode from the average value calculated by the average value calculation unit;
Alternatively, the average value calculated by the average value calculation unit is subtracted from each measurement value acquired by the measurement value acquisition unit, and a weighted average value of the plurality of measurement values after the average value subtraction is calculated, A waveguide mode measurement method, comprising performing one or more amplitude calculation processes among amplitude calculation processes for calculating the amplitude of the electromagnetic wave in the TE11 mode from the weighted average value. A circular waveguide having a tube wall, having a TM01 mode and a TE11 mode as waveguide modes, and having a plurality of holes penetrating through the tube wall as through-holes in the tube wall. a tube;
a plurality of probes having one end inserted into each hole penetrating the tube wall;
a measuring instrument to which the other end of each probe is connected;
A waveguide system comprising: the waveguide mode measuring device according to any one of claims 1 to 8.

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