JPH0140299B2 - - Google Patents
Info
- Publication number
- JPH0140299B2 JPH0140299B2 JP58129551A JP12955183A JPH0140299B2 JP H0140299 B2 JPH0140299 B2 JP H0140299B2 JP 58129551 A JP58129551 A JP 58129551A JP 12955183 A JP12955183 A JP 12955183A JP H0140299 B2 JPH0140299 B2 JP H0140299B2
- Authority
- JP
- Japan
- Prior art keywords
- wave
- circuit
- wave signal
- signal
- delayed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
- G01F1/325—Means for detecting quantities used as proxy variables for swirl
- G01F1/3282—Means for detecting quantities used as proxy variables for swirl for detecting variations in infrasonic, sonic or ultrasonic waves, due to modulation by passing through the swirling fluid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
- G01F1/325—Means for detecting quantities used as proxy variables for swirl
- G01F1/3287—Means for detecting quantities used as proxy variables for swirl circuits therefor
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
Description
【発明の詳細な説明】
本発明は超音波検出式のカルマン渦流速計の改
良に関するものである。流体の流れの中に置いた
物体により、その物体の下流側に流体の流量又は
流速に応じたカルマン渦列が発生し、該カルマン
渦を検出することによりその流体の流量又は流速
を測定できる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of an ultrasonic detection type Karman vortex current meter. An object placed in a fluid flow generates a Karman vortex street corresponding to the flow rate or flow velocity of the fluid on the downstream side of the object, and by detecting the Karman vortex, the flow rate or flow velocity of the fluid can be measured.
従来、カルマン渦の検出には超音波を用い、カ
ルマン渦への発信超音波と該渦を通過して受信し
た受信超音波との平均位相差を一定にする為に、
この平均位相差を直流電圧としてとらえ、それに
よつて超音波発生周波数または受信波の遅延等を
制御することが行われていた。しかし、この従来
の流速計は、制御検出入力及び制御出力がアナロ
グ信号であるため、回路が複雑でありまた信頼性
が低かつた。 Conventionally, ultrasonic waves are used to detect Karman vortices, and in order to keep the average phase difference between the transmitted ultrasonic waves to the Karman vortices and the received ultrasonic waves that have passed through the vortices and received them constant,
This average phase difference is taken as a DC voltage, and the ultrasonic generation frequency or the delay of the received wave is controlled using it. However, in this conventional current meter, the control detection input and control output are analog signals, so the circuit is complicated and the reliability is low.
本発明は上記従来の流速計の欠点を解決するも
ので、制御系の全てにデジタル信号を用い調整個
所を無くし、回路構成を単純なものにし且つ、カ
ルマン渦検出の信頼性を高めた超音波カルマン渦
流速計を得ることを目的とする。 The present invention solves the drawbacks of the conventional current velocity meters described above, and uses digital signals in all control systems to eliminate adjustment points, simplify the circuit configuration, and improve the reliability of Karman vortex detection using ultrasonic waves. The purpose is to obtain a Karman vortex current meter.
次に本発明の一実施例を添附図面に従つて説明
する。第１図は本発明の流速計のカルマン渦検出
の回路図を示す全体のブロツク図であり、カルマ
ン渦検出用センサー部本体１は、流体用管２に流
体の流れに直角になるよう設置したカルマン渦発
生体である柱３と、その下流側でカルマン渦を挾
む位置に対称に設置した超音波送信用マイク４及
び受信用マイク５から構成されている。 Next, one embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 is an overall block diagram showing a circuit diagram for detecting Karman vortex in the current velocity meter of the present invention, in which a sensor body 1 for detecting Karman vortex is installed in a fluid pipe 2 so as to be perpendicular to the flow of the fluid. It consists of a pillar 3 which is a Karman vortex generator, and an ultrasonic transmitting microphone 4 and a receiving microphone 5 which are symmetrically installed at positions sandwiching the Karman vortex on the downstream side thereof.
超音波送受信及び制御回路は、上記センサー部
本体１を挾んで超音波の基準波発振回路６と受信
回路７、遅延波発生回路８、遅延波選択制御回路
９、遅延波選択回路１０、AND回路１１、及び
ローパスフイルター１２から構成されている。該
基準波発振回路６は上記超音波送信用マイク４に
接続すると共に該遅延波選択制御回路９及び該
AND回路に各々接続している。上記超音波受信
用マイク５は該受信回路７に接続し、該受信回路
７は該遅延波発生回路８に接続している。該遅延
波発生回路８は遅延波選択回路１０に接続してｂ
及びｃの信号を送り且つ、上記基準波発振回路６
から接続している上記遅延波選択制御回路９も該
遅延波選択回路１０に接続している。該遅延波選
択回路１０は該遅延波選択制御回路９に接続しル
ープを構成すると共に、上記基準波発振回路６か
ら接続している上記AND回路１１に接続してい
る。該AND回路１１は、抵抗１３とコンデンサ
ー１４から構成されるローパスフイルター１２に
接続している。該ローパスフイルター１２の出力
端はカルマン渦出力端になつている。 The ultrasonic transmission/reception and control circuit includes an ultrasonic reference wave oscillation circuit 6, a reception circuit 7, a delayed wave generation circuit 8, a delayed wave selection control circuit 9, a delayed wave selection circuit 10, and an AND circuit, sandwiching the sensor main body 1. 11, and a low-pass filter 12. The reference wave oscillation circuit 6 is connected to the ultrasonic transmitting microphone 4, and also connected to the delayed wave selection control circuit 9 and the ultrasonic wave transmission microphone 4.
Each is connected to an AND circuit. The ultrasonic receiving microphone 5 is connected to the receiving circuit 7, and the receiving circuit 7 is connected to the delayed wave generating circuit 8. The delayed wave generation circuit 8 is connected to the delayed wave selection circuit 10.
and c signals, and the reference wave oscillation circuit 6
The delayed wave selection control circuit 9 connected to the delayed wave selection circuit 10 is also connected to the delayed wave selection circuit 10. The delayed wave selection circuit 10 is connected to the delayed wave selection control circuit 9 to form a loop, and is also connected to the AND circuit 11 connected from the reference wave oscillation circuit 6. The AND circuit 11 is connected to a low pass filter 12 composed of a resistor 13 and a capacitor 14. The output end of the low-pass filter 12 is a Karman vortex output end.
上記基準波発振回路６で作られた超音波の基準
波は超音波送信マイク４から受信マイク５に伝わ
る間にカルマン波及びその他の原因による位相変
調を受ける。該受信マイク５で受信された超音波
受信波は受信回路７でデジタル化され、該デジタ
ル化された信号は遅延波発生回路８に入り遅延波
発生の処理を受け、第１図の実施例ではｂが受信
波そのまま、またｃがｂの受信波に対して90゜の
位相遅れをもつた遅延波として遅延波選択回路１
０に入力される。該遅延波選択回路１０は電源投
入後遅延波発生回路８からの受信波ｂ又は遅延波
ｃを選び信号ｄとして遅延波選択制御回路９及び
AND回路１１に送る。該遅延波選択制御回路９
はAND回路を備えており、遅延波選択回路１０
によつて選ばれた信号ｄと基準波発振回路６から
の基準信号ａを常に監視し、基準信号ａの立ち上
り及び立ち下がりと信号ｄの立ち上りについて
AND回路が成立すると、即ち上記両信号入力が
同時に加えられたときだけ出力を与え、つまり信
号ｄと基準信号ａの遅れが0゜又は180゜の正又は負
の整数倍であるとき上記遅延波選択回路１０に信
号を送り、該遅延波選択回路１０は今まで遅延波
選択制御回路９及びAND回路１１に送つていた
受信波ｂの信号又は該受信波ｂに対して90゜の位
相遅れをもつた遅延波ｃの信号を今までのものと
異つたものとする。 The ultrasonic reference wave generated by the reference wave oscillation circuit 6 is subjected to phase modulation due to Kalman waves and other causes while being transmitted from the ultrasonic transmitting microphone 4 to the receiving microphone 5. The ultrasonic reception wave received by the reception microphone 5 is digitized by the reception circuit 7, and the digitized signal enters the delayed wave generation circuit 8 and undergoes delay wave generation processing, and in the embodiment shown in FIG. Delayed wave selection circuit 1 where b is the received wave as it is, and c is a delayed wave with a phase delay of 90 degrees with respect to the received wave of b.
It is input to 0. After the power is turned on, the delayed wave selection circuit 10 selects the received wave b or the delayed wave c from the delayed wave generation circuit 8 and outputs the delayed wave selection control circuit 9 and the delayed wave c as a signal d.
Send to AND circuit 11. The delayed wave selection control circuit 9
is equipped with an AND circuit, and the delayed wave selection circuit 10
The signal d selected by
When the AND circuit is established, that is, when both of the above signal inputs are applied at the same time, it gives an output, that is, when the delay between the signal d and the reference signal a is a positive or negative integer multiple of 0° or 180°, the above delayed wave A signal is sent to the selection circuit 10, and the delayed wave selection circuit 10 receives the signal of the received wave b that has been sent to the delayed wave selection control circuit 9 and the AND circuit 11, or has a phase delay of 90° with respect to the received wave b. Assume that the signal of the delayed wave c with .
つまり、信号ｄと基準信号ａとにより回路が形
成され上記AND回路１１から出された信号ｅの
１レベルが0゜又は180゜の幅を持たないように、上
記遅延波選択制御回路９は上記遅延波選択回路１
０によつて信号ｂ又はｃのどちらかを選択して信
号ｄとして送るという位相制御を行つている。 In other words, a circuit is formed by the signal d and the reference signal a, and the delayed wave selection control circuit 9 operates as described above so that one level of the signal e outputted from the AND circuit 11 does not have a width of 0° or 180°. Delayed wave selection circuit 1
Phase control is performed in which either signal b or c is selected by 0 and sent as signal d.
第２図の信号のタイミング図に示してある通
り、信号ａ，ｂ，ｃのデユーテイー比が50％でカ
ルマン渦による信号ｅの１レベルの幅△Ｐの変化
が0゜を超え90゜未満であれば上記の制御によりカ
ルマン渦の検出ができる。該信号ｅは第１図に図
示の通りローパスフイルター１２を介して検出し
たカルマン渦出力端子に送られ流速計の流速測定
に用いられる。 As shown in the signal timing diagram in Figure 2, when the duty ratio of signals a, b, and c is 50%, the change in width △P of one level of signal e due to Karman vortex exceeds 0° and is less than 90°. If so, the Karman vortex can be detected by the above control. As shown in FIG. 1, the signal e is sent to the detected Karman vortex output terminal via a low-pass filter 12 and is used to measure the flow velocity of the current meter.
上記の実施例でも明らかなとおり、本発明では
カルマン渦列中を通過した受信波の送信波に対す
る位相差が±90゜以内であることに着目し、受信
波を基に造られた同相の矩形波による受信波信号
と、90゜位相差の異なる矩形波による遅延波信号
の２種のうちから適切な信号を選択して比較波信
号とし、該比較波信号を送信波と同相の基準波信
号と比較せしめ、この比較結果にもとずいてカル
マン渦によ位相変調成分を検出するものである。
これにより、回路構成が極めて簡単で且つ調整個
所は不要となり、安価で信頼性の高いカルマン渦
流速計を得ることができる。 As is clear from the above embodiments, the present invention focuses on the fact that the phase difference between the received wave that has passed through the Karman vortex street and the transmitted wave is within ±90°, and the in-phase rectangle created based on the received wave. An appropriate signal is selected from two types, a received wave signal by a wave and a delayed wave signal by a rectangular wave with a 90° phase difference, as a comparison wave signal, and the comparison wave signal is used as a reference wave signal in phase with the transmission wave. Based on the results of this comparison, the phase modulation component due to the Karman vortex is detected.
This makes it possible to obtain an inexpensive and highly reliable Karman vortex current meter with an extremely simple circuit configuration and no need for adjustment.
図面は本発明の一実施例を示すものであり、第
１図は本発明の流速計のカルマン渦検出の回路図
であり、第２図は信号のタイミング図である。
符号の説明、１……カルマン渦検出用センサー
部本体、２……流体用管、３……カルマン渦発生
体、４……超音波送信用マイク、５……受信用マ
イク、６……基準波発振回路、７……受信回路、
８……遅延波発生回路、９……遅延波選択制御回
路、１０……遅延波選択回路、１１……AND回
路、１２……ローパスフイルター、１３……抵
抗、１４……コンデンサー。
The drawings show one embodiment of the present invention, and FIG. 1 is a circuit diagram for detecting Karman vortices in the current meter of the present invention, and FIG. 2 is a signal timing diagram. Explanation of symbols, 1... Karman vortex detection sensor unit main body, 2... Fluid tube, 3... Karman vortex generator, 4... Ultrasonic transmission microphone, 5... Receiving microphone, 6... Reference wave oscillation circuit, 7...reception circuit,
8... Delayed wave generation circuit, 9... Delayed wave selection control circuit, 10... Delayed wave selection circuit, 11... AND circuit, 12... Low pass filter, 13... Resistor, 14... Capacitor.
Claims (1)
を発生させて送信用マイクを介してカルマン渦列
中に伝送させる基準波発振回路と、カルマン渦列
中を通過して位相変調された受信波を受信用マイ
クで検出し、当該受信波に基づいて矩形波による
超音波の受信波信号を発生する受信回路と、前記
受信波信号を受けて受信波信号に対して90゜の位
相差を有する矩形波による超音波の遅延波信号を
造ると共に、当該遅延波信号と受信波信号とを出
力する遅延波発生回路と、前記遅延波信号と受信
波信号のいずれか一方を選択的に比較波信号とし
て出力する遅延波選択回路と、該遅延波選択回路
から出力された比較波信号と前記基準波信号とが
入力され、当該両信号の立ち上り又は立ち下りが
一致しない場合には前記遅延波選択回路に対して
引続き同じ比較波信号を出力するよう制御すると
共に、両信号の立ち上り又は立ち下りが一致する
場合には遅延波選択回路に対して別の比較波信号
を出力するよう切換え制御させる遅延波選択制御
回路と、前記比較波信号と基準波信号とが入力さ
れてカルマン渦による位相差をパス巾の変化とし
て出力する比較回路と、該比較回路の出力から超
音波信号を除去してカルマン渦による位相変調成
分を検出するローパスフイルターとを備えた超音
波検出式カルマン渦流速計。1 A reference wave oscillation circuit that generates an ultrasonic reference wave signal using a rectangular wave with a constant period and transmits it into the Karman vortex street via a transmitting microphone, and a received wave that is phase-modulated after passing through the Karman vortex street. a receiving circuit that detects the received wave signal with a receiving microphone and generates a rectangular ultrasonic received wave signal based on the received wave; and a receiving circuit that receives the received wave signal and has a phase difference of 90° with respect to the received wave signal. a delayed wave generation circuit that generates a delayed ultrasonic wave signal using a rectangular wave and outputs the delayed wave signal and the received wave signal; and a wave signal that selectively compares either the delayed wave signal or the received wave signal. and a comparison wave signal output from the delayed wave selection circuit and the reference wave signal are input, and if the rising or falling edges of the two signals do not match, the delayed wave selection circuit outputs A delay wave that controls the delay wave selection circuit to continue to output the same comparison wave signal, and to control the delay wave selection circuit to output another comparison wave signal when the rising or falling edges of both signals match. a selection control circuit; a comparison circuit into which the comparison wave signal and the reference wave signal are input; and a comparison circuit that outputs the phase difference caused by the Karman vortex as a change in path width; and a comparison circuit that removes the ultrasonic signal from the output of the comparison circuit to generate the Karman vortex. An ultrasonic detection type Karman vortex current meter equipped with a low-pass filter that detects phase modulation components.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58129551A JPS6022625A (en) | 1983-07-18 | 1983-07-18 | Ultrasonic detection type Karman vortex current meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58129551A JPS6022625A (en) | 1983-07-18 | 1983-07-18 | Ultrasonic detection type Karman vortex current meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6022625A JPS6022625A (en) | 1985-02-05 |
| JPH0140299B2 true JPH0140299B2 (en) | 1989-08-28 |
Family
ID=15012300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58129551A Granted JPS6022625A (en) | 1983-07-18 | 1983-07-18 | Ultrasonic detection type Karman vortex current meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6022625A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60109020U (en) * | 1983-12-28 | 1985-07-24 | 株式会社クボタ | Ultrasonic detection type Karman vortex current meter |
| JPS6172638U (en) * | 1984-10-18 | 1986-05-17 | ||
| JPS61132717U (en) * | 1985-02-07 | 1986-08-19 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57201308A (en) * | 1981-06-03 | 1982-12-09 | Mitsubishi Electric Corp | Frequency demodulating circuit |
-
1983
- 1983-07-18 JP JP58129551A patent/JPS6022625A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6022625A (en) | 1985-02-05 |
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