A dual-threshold detection circuit and detection method for ultrasonic signal propagation time

A detection circuit and signal propagation technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measurement devices, and electrical devices, etc., can solve problems affecting measurement accuracy, etc., and achieve light weight, convenient measurement of ultrasonic propagation time, and accurate measurement. Effect

Active Publication Date: 2018-05-01
BEIJING INST OF CONTROL ENG
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When comparing the ultrasonic signal with a single threshold, there is a change in the ultrasonic signal, which causes the ultrasonic propagation time to stop and the timing enable to change, which affects the measurement accuracy

Method used

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  • A dual-threshold detection circuit and detection method for ultrasonic signal propagation time
  • A dual-threshold detection circuit and detection method for ultrasonic signal propagation time
  • A dual-threshold detection circuit and detection method for ultrasonic signal propagation time

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Embodiment Construction

[0055] see figure 1 The ultrasonic signal dual-threshold detection circuit of the present invention includes a first comparator U1, a second comparator U2, a first NOR gate U3, an AND gate U4, a NOT gate U5 and a second NOR gate U6;

[0056] The positive input terminal of the first comparator U1 is connected to the measured ultrasonic signal, the negative input terminal is connected to the first threshold signal, the output terminal OUT is connected to an input terminal of the AND gate U4, and the reverse output terminal OutB is connected to the first NOR gate One input terminal of U3, the latch terminal Latch is connected to the output terminal of the first NOR gate U3;

[0057] The negative input terminal of the second comparator U2 is connected to the measured ultrasonic signal, the positive input terminal is connected to the second threshold signal, the output terminal OUT is connected to the other input terminal of the AND gate U4, the reverse output terminal OutB is susp...

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Abstract

The present invention relates to a dual-threshold detection circuit and detection method for ultrasonic signal propagation time. The detection circuit includes a first comparator, a second comparator, a first NOR gate, an AND gate, a NOT gate and a second NOR gate; The first threshold signal is 0.2~0.5V; the second threshold signal is 0~20mV; the first external control signal is turned to low level after 80~100μs of the emission pulse; the second external control signal is 80~100μs after the emission pulse After flipping to low or high level. It avoids the error caused by the influence of fluid temperature and viscosity on the ultrasonic waves in the fluid propagation, making the propagation time measurement more accurate; the invention can cut out the NOT gate U5 and the NOR gate U6, and lead the Latch of the first comparator U2 The pin is connected to GND, which can also realize the detection processing and generate multiple stop timing enable functions, which can further simplify the circuit and improve reliability.

Description

technical field [0001] The invention relates to a double-threshold detection circuit and a detection method for ultrasonic signal propagation time, belonging to the field of flow metering instruments. Background technique [0002] Ultrasonic flowmeter is a kind of measuring instrument that uses the fluid flow to modulate the ultrasonic signal, and obtains the volume flow by detecting the propagation time of the signal. Ultrasonic flowmeter has the characteristics of simple structure, fast response, large measurement range, good stability and high precision. In addition, the ultrasonic flowmeter is also a non-contact measurement method, which will not cause pressure loss to the measurement pipeline, has no requirements for the measurement medium, and can measure the flow rate of various gases and liquid media. [0003] In the process of measuring the ultrasonic propagation time, when the excitation line starts to generate the excitation pulse, the high-precision time measure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/06G01F1/66
Inventor 李宗良于洋李湘宁马云华白建军潘海林梁军强王雪婷成聪
Owner BEIJING INST OF CONTROL ENG
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