关键词: 流量检测, 超声波流量计, 时差法, 线性

Abstract:

In order to improve the measurement accuracy and lower limit of gas pipeline in coal mine, integrating the advantage of ultra-audible sound flow meter and time difference method detect theory, a pipeline ultra-audible sound gas flow meter was designed which used 40kHz ultra-audible sound of energy conversion as the main component, the two-level amplifier circuit and square pulse generator were designed using the TDC-GP22 for high precision timing measurement. The experiment analysis shows that the flow meter has a very high accuracy with the measure lower limit up to 0.05m/s, and the time difference has a very good linearity relationship with the gas flow speed.

Key words: Flow Detection, Ultra-audible Flow Meter, Time Difference Method, Linear