CN104406641A - Method and compensation system for detecting peak value of ultrasonic flow meter - Google Patents
Method and compensation system for detecting peak value of ultrasonic flow meter Download PDFInfo
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- CN104406641A CN104406641A CN201410680831.8A CN201410680831A CN104406641A CN 104406641 A CN104406641 A CN 104406641A CN 201410680831 A CN201410680831 A CN 201410680831A CN 104406641 A CN104406641 A CN 104406641A
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Abstract
The invention discloses a method and a compensation system for detecting the peak value of an ultrasonic flow meter. The method and the compensation system are capable of dynamically compensating voltage drop of a diode in a peak-value detector circuit, and measuring an accurate ultrasonic signal peak value, so as to be applied to an accurate operation process of the ultrasonic flow meter. The method comprises the following steps: providing reference voltage; measuring voltage on a capacitor, and calculating the difference between the voltage and the reference voltage to obtain a forward voltage drop of the diode; when a normal ultrasonic signal peak value is measured, adding the detected voltage on the capacitor with the obtained forward voltage drop of the diode as signal peak value voltage to calculate the flow. The method and the system disclosed by the invention are capable of dynamically compensating the diode voltage drop in the peak-value detector circuit and measuring the accurate ultrasonic signal peak value, so as to be applied to the accurate operation process of the ultrasonic flow meter, and therefore, the accuracy of the flow meter is improved.
Description
Technical field
The present invention relates to ultrasonic flow rate measurement amount field, particularly relate to the bucking-out system of a kind of ultrasonic flow meter peak-value detection method and ultrasonic flow meter peakvalue's checking.
Background technology
Ultrasonic flow meter is the flowmeter that the time difference propagated in a fluid by ultrasonic signal or frequency-splitting carry out measuring flow, its most important part is exactly process to ultrasonic signal and measurement, and the peakvalue's checking of ultrasonic signal a kind of metering system that to be ultrasonic signal process conventional.At present, for the peakvalue's checking of ultrasonic signal, mostly use simple peak detection circuit, namely utilize the one-way conduction characteristic of diode, utilize the peak value of capacitance stores ultrasonic signal, then measure the peak value of magnitude of voltage as ultrasonic signal of capacitance stores.This method has obvious deficiency: 1. diode is when one-way conduction, there is forward conduction voltage drop, so the magnitude of voltage of capacitance stores differs the forward conduction voltage drop of diode with the true peaks of ultrasonic signal; 2. diode due to model, batch difference, forward conduction voltage drop is also not quite similar, and when temperature changes, and the one-way conduction pressure drop of diode exists serious temperature drift.So this simple method for measuring, the ultrasound wave peak value recorded is a coarse value, only can be used for rough computing.
Summary of the invention
The present invention is to solve in ultrasonic flow meter peak-detector circuit by the forward conduction voltage drop of diode and there is serious temperature and float the measurement out of true problem caused, and provide a kind of can diode drop in dynamic compensation peak-detector circuit, accurate ultrasonic signal peak value can be measured, thus the ultrasonic flow meter peak-value detection method of ultrasonic flow meter accurate operational process can be applied to.
Another object of the present invention be to provide a kind of can diode drop in dynamic compensation peak-detector circuit, accurate ultrasonic signal peak value can be measured, thus the bucking-out system of the ultrasonic flow meter peakvalue's checking of ultrasonic flow meter accurate operational process can be applied to.
The technical scheme adopted for realizing object of the present invention is:
A kind of ultrasonic flow meter peak-value detection method, comprises the steps:
(1) reference voltage is provided, measures the voltage on electric capacity, and calculate the difference of this voltage and reference voltage, obtain diode forward conduction voltage drop;
(2) when normal ultrasonic signal peak value measurement, the voltage that described electric capacity detects is added the diode forward conduction voltage drop that step (1) obtains, as signal peak voltage calculated flow rate.
A kind of bucking-out system of ultrasonic flow meter peakvalue's checking, comprise MCU module U1, diode D1, electronic switch U2, electric capacity C1, diode D2, resistance R1 and A/D modular converter U3, S1 one end, ultrasonic signal source ground connection, the Chang Kaiduan of the other end and described electronic switch U2 is connected, the normally closed termination reference voltage V of described electronic switch U2
+, the common port of described electronic switch U2 connects with described diode D1 positive pole, the control end of described electronic switch U2 connects with the control output end of described MCU module U1, the negative pole of described diode D1 respectively with described electric capacity C1 one end, the input end of described resistance R1 one end and described AD conversion module U3 connects, described electric capacity C1 other end ground connection, the described resistance R1 other end connects with the positive pole of described diode D2, the negative pole of described diode D2 and the I/O port of described MCU module U1 are connected, the output terminal of described AD conversion module U3 and the input end of described MCU module U1 are connected, the negative pole that described MCU module U1 controls described diode D2 is high level, and controls described electronic switch U2 and switch to normal-closed end, makes the positive pole of described diode D1 connect reference voltage V
+, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
1, described MCU module U1 calculates the forward conduction voltage drop V of diode D1
ffor: V
f=V
+-V
1, the negative pole that described MCU module U1 controls described diode D2 is low level, the voltage of described electric capacity C1 is released, the negative pole controlling described diode D2 is again high level, and control described electronic switch U2 and switch to Chang Kaiduan, make described diode D1 positive pole meet ultrasonic signal source S1, signal is by described diode D1, and crest voltage is stored on described electric capacity C1, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
2, calculate the crest voltage V of signal
pfor: V
p=V
2+ V
f, as ultrasonic signal peak voltage calculated flow rate.
Compared with prior art, the invention has the beneficial effects as follows:
1, detection method of the present invention is by reference voltage and the difference detecting voltage, obtain the forward conduction voltage drop of diode, the forward conduction voltage drop of diode is compensated when normal ultrasonic signal is measured, obtain signal peak voltage accurately, eliminate the measurement caused due to diode model, batch difference or temperature drift and forbidden problem, the ultrasonic signal peak value measured is applied in accurate Calculation process, improves the degree of accuracy of flowmeter.
2, can diode drop in dynamic compensation peak-detector circuit by bucking-out system of the present invention, can measure accurate ultrasonic signal peak value, thus can be applied to ultrasonic flow meter accurate operational process, structure is simple, practical.
Accompanying drawing explanation
Figure 1 shows that the circuit theory diagrams of the bucking-out system of ultrasonic flow meter peakvalue's checking of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Ultrasonic flow meter peak-value detection method of the present invention comprises the steps:
(1) reference voltage is provided, measures the voltage on electric capacity, and calculate the difference of this voltage and reference voltage, obtain diode forward conduction voltage drop;
(2) when normal ultrasonic signal peak value measurement, the voltage that described electric capacity detects is added the diode forward conduction voltage drop that step (1) obtains, as signal peak voltage calculated flow rate.
The present invention realizes the schematic diagram of the bucking-out system of the ultrasonic flow meter peakvalue's checking of above-mentioned detection method as shown in Figure 1, comprise MCU module U1, diode D1, electronic switch U2, electric capacity C1, diode D2, resistance R1 and A/D modular converter U3, wherein, MCU module can adopt MSP430 series monolithic MSP430F249TPM or other models of homologous series of TI company, also MCS-51 series can be adopted, AVR series or the MCU such as PIC is serial, S1 one end, ultrasonic signal source ground connection, the Chang Kaiduan of the other end and described electronic switch U2 is connected, the normally closed termination reference voltage V of described electronic switch U2
+, the common port of described electronic switch U2 connects with described diode D1 positive pole, the control end of described electronic switch U2 connects with the control output end of described MCU module U1, the negative pole of described diode D1 respectively with described electric capacity C1 one end, the input end of described resistance R1 one end and described AD conversion module U3 connects, described electric capacity C1 other end ground connection, the described resistance R1 other end connects with the positive pole of described diode D2, the negative pole of described diode D2 and the I/O port of described MCU module U1 are connected, the output terminal of described AD conversion module U3 and the input end of described MCU module U1 are connected, the negative pole that described MCU module U1 controls described diode D2 is high level, and controls described electronic switch U2 and switch to normal-closed end, makes the positive pole of described diode D1 connect reference voltage V
+, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
1, described MCU module U1 calculates the forward conduction voltage drop V of diode D1
ffor: V
f=V
+-V
1, the negative pole that described MCU module U1 controls described diode D2 is low level, the voltage of described electric capacity C1 is released, the negative pole controlling described diode D2 is again high level, and control described electronic switch U2 and switch to Chang Kaiduan, make described diode D1 positive pole meet ultrasonic signal source S1, signal is by described diode D1, and crest voltage is stored on described electric capacity C1, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
2, calculate the crest voltage V of signal
pfor: V
p=V
2+ V
f, as ultrasonic signal peak voltage calculated flow rate.
Detection method of the present invention is by reference voltage and the difference detecting voltage, obtain the forward conduction voltage drop of diode, the forward conduction voltage drop of diode is compensated when normal ultrasonic signal is measured, obtain signal peak voltage accurately, eliminate the measurement caused due to diode model, batch difference or temperature drift and forbidden problem, the ultrasonic signal peak value measured is applied in accurate Calculation process.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. a ultrasonic flow meter peak-value detection method, is characterized in that, comprises the steps:
(1) reference voltage is provided, measures the voltage on electric capacity, and calculate the difference of this voltage and reference voltage, obtain diode forward conduction voltage drop;
(2) when normal ultrasonic signal peak value measurement, the voltage that described electric capacity detects is added the diode forward conduction voltage drop that step (1) obtains, as signal peak voltage calculated flow rate.
2. one kind realizes the bucking-out system of the ultrasonic flow meter peakvalue's checking of detection method described in claim 1, it is characterized in that, comprise MCU module U1, diode D1, electronic switch U2, electric capacity C1, diode D2, resistance R1 and A/D modular converter U3, S1 one end, ultrasonic signal source ground connection, the Chang Kaiduan of the other end and described electronic switch U2 is connected, the normally closed termination reference voltage V of described electronic switch U2
+, the common port of described electronic switch U2 connects with described diode D1 positive pole, the control end of described electronic switch U2 connects with the control output end of described MCU module U1, the negative pole of described diode D1 respectively with described electric capacity C1 one end, the input end of described resistance R1 one end and described AD conversion module U3 connects, described electric capacity C1 other end ground connection, the described resistance R1 other end connects with the positive pole of described diode D2, the negative pole of described diode D2 and the I/O port of described MCU module U1 are connected, the output terminal of described AD conversion module U3 and the input end of described MCU module U1 are connected, the negative pole that described MCU module U1 controls described diode D2 is high level, and controls described electronic switch U2 and switch to normal-closed end, makes the positive pole of described diode D1 connect reference voltage V
+, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
1, described MCU module U1 calculates the forward conduction voltage drop V of diode D1
ffor: V
f=V
+-V
1, the negative pole that described MCU module U1 controls described diode D2 is low level, the voltage of described electric capacity C1 is released, the negative pole controlling described diode D2 is again high level, and control described electronic switch U2 and switch to Chang Kaiduan, make described diode D1 positive pole meet ultrasonic signal source S1, signal is by described diode D1, and crest voltage is stored on described electric capacity C1, described MCU module U1 controls described AD conversion module U3 and carries out AD conversion, records the magnitude of voltage V on described electric capacity C1
2, calculate the crest voltage V of signal
pfor: V
p=V
2+ V
f, as ultrasonic signal peak voltage calculated flow rate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410680831.8A CN104406641B (en) | 2014-11-24 | 2014-11-24 | A kind of ultrasonic flowmeter peak-value detection method and compensation system |
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| CN201410680831.8A CN104406641B (en) | 2014-11-24 | 2014-11-24 | A kind of ultrasonic flowmeter peak-value detection method and compensation system |
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| CN104406641A true CN104406641A (en) | 2015-03-11 |
| CN104406641B CN104406641B (en) | 2018-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932037A (en) * | 2015-12-30 | 2017-07-07 | 浙江大学 | A kind of transit-time ultrasonic flow meter receives signal wave crest sequence location decision method |
| CN108981897A (en) * | 2018-09-26 | 2018-12-11 | 李扬渊 | Ultrasound signal receipt circuit and signal detecting method |
Citations (4)
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|---|---|---|---|---|
| JPH1019619A (en) * | 1996-06-28 | 1998-01-23 | Osaka Gas Co Ltd | Method of ultrasonic measuring flow velocity |
| CN101718567A (en) * | 2009-10-29 | 2010-06-02 | 南京大学 | Pulse-detecting circuit used for ultrasonic gas flowmeter based on time difference method |
| CN201748940U (en) * | 2010-06-04 | 2011-02-16 | 中环天仪股份有限公司 | Ultrasonic flowmeter peak detection circuit adopting singlechip to control discharging |
| CN203086427U (en) * | 2013-01-31 | 2013-07-24 | 杭州士兰微电子股份有限公司 | Peak detection circuit, input feedforward compensating circuit and power factor correction circuit |
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2014
- 2014-11-24 CN CN201410680831.8A patent/CN104406641B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1019619A (en) * | 1996-06-28 | 1998-01-23 | Osaka Gas Co Ltd | Method of ultrasonic measuring flow velocity |
| CN101718567A (en) * | 2009-10-29 | 2010-06-02 | 南京大学 | Pulse-detecting circuit used for ultrasonic gas flowmeter based on time difference method |
| CN201748940U (en) * | 2010-06-04 | 2011-02-16 | 中环天仪股份有限公司 | Ultrasonic flowmeter peak detection circuit adopting singlechip to control discharging |
| CN203086427U (en) * | 2013-01-31 | 2013-07-24 | 杭州士兰微电子股份有限公司 | Peak detection circuit, input feedforward compensating circuit and power factor correction circuit |
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| Title |
|---|
| 张国雄 等: "《测控电路》", 31 January 2001, 机械工业出版社 * |
| 施昌彦: "测量误差、修正值及偏差", 《中国计量》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106932037A (en) * | 2015-12-30 | 2017-07-07 | 浙江大学 | A kind of transit-time ultrasonic flow meter receives signal wave crest sequence location decision method |
| CN106932037B (en) * | 2015-12-30 | 2019-04-02 | 浙江大学 | A kind of transit-time ultrasonic flow meter reception signal wave crest sequence location determination method |
| CN108981897A (en) * | 2018-09-26 | 2018-12-11 | 李扬渊 | Ultrasound signal receipt circuit and signal detecting method |
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| CN104406641B (en) | 2018-01-26 |
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Address after: No. 256-11, Huitong Street, Ganjingzi District, Dalian, Liaoning 116091 Patentee after: Li Zhuo Address before: 116000 No. 1-5-2, No. 37, Spring H1 District, Ganjingzi District, Dalian City, Liaoning Province Patentee before: Li Zhuo |
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Effective date of registration: 20230315 Address after: No. 188-2, Haiming Road, Shilibao Street, Dalian Free Trade Zone, Liaoning 116102 Patentee after: Hengke Instrument (Dalian) Co.,Ltd. Address before: No. 256-11, Huitong Street, Ganjingzi District, Dalian, Liaoning 116091 Patentee before: Li Zhuo |
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