JPS6143646B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a marker device, and particularly to a marker device suitable for use in calibrating the horizontal axis of a spectrum.

In conventional analyzers, markers are recorded on recording paper as scales when, for example, the horizontal axis of the spectrum is the wave number or wavelength in a spectrophotometer, or the specific mass (m/e) in a mass spectrometer. There is a device. An example of marker display by a conventional marker device is shown in FIG. 1st
The figure shows the spectral curve 10 of polystyrene, which is usually used as a standard material in an infrared spectrophotometer.
The horizontal axis is the wave number, and the vertical axis is the transmittance. Here, in order to read the known peak positions 11, 12, and 13 of the spectrum curve 10, short pulse markers 21 and long pulse markers 22 are written at regular intervals on the wave number axis 20. Using these pulse markers 21 and 22, the peak positions 11 and 1 of the spectrum curve 10 are determined.
2 and 13, and since the peak position of the standard substance is known, wave number calibration can be performed by comparing it with the reading value from the pulse marker. In order to improve the accuracy of this wave number calibration, it is sufficient to increase the accuracy of wave number reading by the pulse marker. However, there is a limit to how narrow the marker interval can be in order to improve reading accuracy, and if the interval is too narrow, it becomes difficult to read and wave number calibration cannot be performed accurately.

There are also examples where the display position of the pulse marker is displayed not on the wavenumber axis but on the spectrum curve.
There are problems similar to those mentioned above.

Furthermore, as another method, there is a method in which the peak position of the spectrum curve is detected and the wave number is read by data processing. Peak position detection using this method detects the point where the first-order differential value of the spectrum curve becomes zero. However, the method of detecting the point where the first derivative value is zero is easily affected by noise, cannot accurately detect the peak position for wide peaks of absorption lines, and has difficulty in fixing adjacent lines. It has problems such as: Therefore, even with this method, there is a problem that wave number calibration cannot be performed accurately.

The present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a marker device that can easily and accurately read the horizontal axis of the peak position of a spectral curve, and that allows accurate horizontal axis calibration. It is on offer.

In the present invention, a marker is written on the spectrum when the horizontal axis value of a known peak position matches the horizontal axis value during horizontal axis scanning.

An embodiment of the present invention will be described with reference to FIGS. 2 and 3. In FIG. 2, a scan control circuit 50 is a circuit that controls scanning of the horizontal axis in the spectrum curve. The scan control circuit 50 may be, for example, a circuit that controls pulses supplied to the pulse motor when a pulse motor is used for wavelength scanning of a spectrometer in a spectrophotometer or an X-ray analyzer, or a circuit that controls magnetic field scanning in a mass spectrometer. There are circuits that control the voltage applied to magnets, circuits that control magnetic field scanning or frequency scanning in nuclear magnetic resonance apparatuses, etc. Here, the scan control circuit 50
will be explained below as a circuit for controlling pulses supplied to a pulse motor. The pulses generated by the scan control circuit 50 are supplied to a pulse motor (not shown), etc., and are read into the counter 30.
The comparator 35 compares the contents of the counter 30 with the storage device 8.
It compares the contents of the register 45 that holds some of the contents of the plurality of 0s and outputs a comparison signal. Address counter 40 receives the output signal of comparator 35 and designates an address in storage device 80 to be read. The timer 55 receives the output signal of the comparator 35 and outputs the signal in a fixed time sequence. Adder/subtractor 60 receives a signal from timer 55 , adds/subtracts a constant voltage from power source 65 to spectrum data 61 obtained from a detector (not shown), and outputs the result to recorder 70 .

The operation of this embodiment will be explained below. In the storage device 80, the horizontal axis values of the peak positions of the spectrum of the standard substance, for example, the wave numbers of the peak positions 11, 12, and 13 of the spectrum shown in FIG. 1, are sequentially stored by specifying addresses. Let the respective address positions be i, i+1, and i+2. To measure the spectrum of a standard substance using analytical equipment,
When scanning is started by the scanning control circuit 50, the pulse signals 51 are counted by the counter 30. On the other hand, at the start of scanning, the address counter 40 is
The address i of the storage device 80 is specified by the address selection signal 41, and the storage contents of the address i,
That is, the wave number at peak position 11 is
5. The comparator 35 compares the contents A of the counter 30, which changes with scanning, and the contents B of the register 45, which is at a constant value, and when the contents match, the comparator 35 outputs a match signal 36.
Output. When the scan control circuit 50 receives the match signal 36, it stops scanning. In addition, spectrum data 61 obtained as a result of scanning by the scan control circuit 50 is also recorded on the recorder 70, but upon receiving the coincidence signal 36, horizontal axis feeding of the recorder 70 is stopped. On the other hand, the timer 55 starts operating upon receiving the coincidence signal 36. The timer 55 starts operating and generates an addition command 56 after _t1 seconds. The adder/subtractor 60 is
Upon receiving the addition instruction 56, the spectrum data 61
A constant voltage 62 from a constant voltage source 65 is added to . FIG. 3 shows a spectrum recorded on a recorder by the apparatus shown in FIG. 2, and a positive marker 26 is recorded on the spectrum 10 by the addition instruction 56 mentioned above. Next, the timer 55 executes a subtraction command 57 after t ₂ seconds.
occurs. Upon receiving the subtraction command 57, the adder/subtractor 60 subtracts a constant voltage 62 from a constant voltage source 65 to the spectrum data 61. Therefore, the third
As shown, a negative marker 27 is recorded on the spectrum 10, and now a marker 21 is recorded. Furthermore, the timer 55 generates a start signal 58 after _t3 seconds. Upon receiving the start signal 58,
The scan control circuit 50 starts scanning, and the recorder 70 also starts horizontal axis feeding. The contents of the counter 30 increase with the start of scanning. Therefore, the content A of counter 30 will be greater than the content B of register 45 and comparator 35 will generate a mismatch signal 37. When the address counter 40 receives the mismatch signal 37, it increments the designated address by "1" and designates the address i+1 of the storage device. address i+
1, that is, the wave number for peak position 12 is held in register 45. Therefore, the content A becomes smaller than the content B, and when the content A of the counter 30 matches the content B of the register 45 during scanning, a marker is recorded on the spectrum as described above. By repeating the above steps, as shown in FIG.
2 and 23 are recorded. As is clear from comparing FIG. 1 and FIG. 3, it is easier to confirm the peak position and marker in FIG. 3. That is, it is clear that the marker 21 and the peak position 11 match, the peak position 12 is shifted to the right with respect to the marker 22, and the peak position 13 is shifted to the left with respect to the marker 23. be.

In the above description, the marker is described above and below the spectrum, but it is also possible to describe only one of them. however,
If the absorption line of the spectrum is sharp, the marker and the spectrum may overlap, so writing the markers above and below has the advantage that even if one side overlaps, it can be confirmed.

Furthermore, in the above description, the counter 30 counts the signal that the scanning control circuit 50 applies to the controlled section, for example, the pulse supplied to the pulse motor. It is also possible to count the signals from the

Furthermore, as described above, the aspects of the counter 30 and the scanning control circuit 50 can be changed depending on the type of analytical instrument. For example, in a mass spectrometer, the voltage for magnetic field scanning can be input to the comparator as an analog quantity, or it can be converted to a digital quantity and then input to the comparator.

According to an embodiment of the present invention, the difference between the marker position and the peak position of the spectrum can be easily determined, so the peak position of the spectrum curve can be read easily and accurately, and accurate horizontal axis calibration can be performed. becomes.

Furthermore, since markers are written above and below the spectrum, even if one marker overlaps the spectrum, the difference from the peak position can be determined.

Furthermore, there is no need to memorize the horizontal axis scale of the peak position of the spectrum of the standard substance during calibration.

A modification of the present invention will be explained using FIG. 4. In this modification, the main part of the embodiment shown in FIG. 2 is performed by an arithmetic storage device 90, and a predetermined program is stored in the arithmetic storage device 90, and the system operates according to the program. It is. Output data from arithmetic storage device 90 is supplied to analytical instrument 100 via output interface 95 . Various data output from the analytical instrument 100 are processed by the arithmetic storage device 90 via the input interface 110, and markers are added to the spectral data converted into digital signals by the A/D converter 105. do. The signal is then converted into an analog signal by the D/A converter 115 and then recorded on the recorder 70.

According to the present invention, it is possible to easily and accurately read the horizontal axis of the peak position of a spectral curve.
Accurate horizontal axis calibration becomes possible.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a marker using a conventional marker device, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of a marker of an embodiment of the present invention. FIG. 4 is a block diagram of a modification of the present invention. 35... Comparator, 60... Addition/subtraction device, 65...
Power supply, 70...Recorder, 80...Storage device.

Claims (1)

[Scope of Claims] 1. A marker device that marks a marker on a spectrum obtained by scanning the horizontal axis, including means for storing known horizontal axis values at arbitrary peak positions in the spectrum of a standard substance, and A marker device comprising means for detecting coincidence between a horizontal axis value and a horizontal axis stored in the storage means and marking a marker on the spectrum. 2. The marker device according to claim 1, wherein the means for marking the marker on the spectrum marks the marker above and below the spectrum in the vertical axis direction of the spectrum.