| 基于TDC-GP22的超声波渡越时间测量方法研究 |
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| 引用本文：马勤勇1，2.基于TDC-GP22的超声波渡越时间测量方法研究[J].计算技术与自动化,2023,(2):96-99 |
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| 中文摘要:介绍了采用TDC-GP22用于超声波气体流量计信号接收和渡越时间（TOF）检测的实现方法。针对超声波信号接收电路，设计了带通滤波放大电路进行噪声抑制和放大处理，采用高速模数转换器（ADC）和数字电位器设计了增益控制电路，实现了对超声波接收信号的自动增益控制（AGC）；针对超声波渡越时间检测，设计了阈值比较电路和高精度TDC-GP22时间检测电路。利用噪声阈值门限对TDC-GP22进行动态使能，避免了噪声引起的误检测。在音速喷嘴气体流量标准装置上进行了流量标定试验，试验结果证明了本测量系统具有良好的测量精度和测量稳定性。 |
| 中文关键词:超声波气体流量计 渡越时间 数字电位器 自动增益控制 阈值比较 |
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| Research on Ultrasonic Transit Time Measurement Method Based on TDC-GP22 |
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| Abstract:This paper introduces the realization method of TDC-GP22 for signal reception and TOF detection of ultrasonic gas flowmeter. For the ultrasonic signal receiving circuit, the band-pass filter amplifier circuit is designed for noise suppression and amplification. The gain control circuit is designed by using high-speed analog-to-digital converter (ADC) and digital potentiometer, and the automatic gain control (AGC) of the ultrasonic signal is realized; for ultrasonic transit time detection, a threshold comparison circuit and a high-precision TDC-GP22 time detection circuit are designed. The noise threshold is used to dynamically enable TDC-GP22 to avoid false detection caused by noise. The flow calibration test is carried out on the sonic nozzle gas flow standard device. The test results show that the measurement system has good measurement accuracy and stability. |
| keywords:ultrasonic gas flowmeter transit time digital potentiometer automatic gain control threshold comparison |
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