Ultrasonic Doppler flowmeter with correction for vibratory signals at zero-flow conditions

摘要

An ultrasonic Doppler flowmeter for measuring flowing fluid by reflection of sonic waves from particles in the fluid is provided with a discriminating circuit including a comparator amplifier connected to the received signal that produces a zero-flow output from the flowmeter when the signal received by the receiving means is produced by vibration of the reflecting particles in a zero-flow condition.