Automatic gain control method and circuit for ultrasonic flow metering device

Through the automatic gain control method, the gain is adjusted according to the pulse width deviation value of the echo signal in the ultrasonic flow metering system, which solves the problems of inaccurate measurement and poor stability in the environment changes in traditional systems, and achieves higher measurement accuracy and stability.

CN119642912AActive Publication Date: 2025-03-18SUZHOU ANCHAO MICROELECTRONICS CO LTD
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Patent Information

Application Number
CN202411949760.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-03-18
Estimated Expiration
2044-12-27

AI Technical Summary

Technical Problem

Traditional ultrasonic flow metering systems cannot adapt to changes in the environment, resulting in inaccurate measurement results and poor stability, and the fixed gain settings cannot be effectively adjusted to cope with signal amplitude fluctuations.

Method used

The automatic gain control method is adopted to measure the pulse width of the echo signal, calculate the deviation value, and adjust the gain of the variable gain amplifier to ensure the stability of the echo signal amplitude.

Benefits of technology

The measurement accuracy and stability of the ultrasonic flow metering device under different environmental conditions is improved, the error caused by fluctuations in signal amplitude is reduced, and the accuracy of the system's response speed and gain adjustment are enhanced.

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Abstract

The invention provides an automatic gain control method and circuit of an ultrasonic flow metering device, and aims to improve the accuracy and stability of flow metering. According to the method, the gain is automatically adjusted by measuring the pulse width of an echo signal and comparing the pulse width with an expected value. The circuit comprises a transmitting circuit, an ultrasonic transducer, a variable gain amplifier, a variable threshold comparator, a zero-crossing comparator, a flight time measuring unit, a pulse width measuring unit, a time-to-digital converter and a calculation and control unit. According to the scheme, independent gain configuration of uplink and downlink flight time and a fine gain adjustment strategy based on echo amplitude change can be realized. In addition, by setting the allowable maximum pulse width change value, whether the measurement error is within a reasonable range can be automatically judged, and re-measurement can be carried out when necessary. According to the integrated design scheme, the flexibility and the response speed of measurement are improved, the signal processing flow is optimized, and an innovative solution is provided for ultrasonic flow metering.
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