JPS6019927U - ultrasonic flow meter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

FIG. 1 shows an ultrasonic flowmeter of the prior art, FIG. 2 shows an ultrasonic flowmeter of this invention, FIGS. 3 and 4 are diagrams for explaining the operation of this invention, and FIG. FIG. 5 is a diagram for explaining the majority logic circuit. 1... Successive approximation means, 2... Conversion circuit, 3... Propagation path, 4... Time difference detection circuit, 5... Plurality Signal generation circuit, 6...
Majority logic circuit.

Claims (1)

[Scope of utility model registration request] A propagation path having a transducer attached to a pipe through which a fluid to be measured transmits and receives ultrasonic waves, a plurality of synchronization signals that drive the transducer a plurality of times, and a fixed delay time in synchronization with the plurality of synchronization signals. a time difference detection circuit that inputs the plurality of received signals from the propagation path and the plurality of frequency-divided signals and detects a mutual time difference; a majority logic circuit that outputs a determination signal using majority logic from the output of the time difference detection circuit; and successive approximation means that successively approximates the plurality of frequency-divided signals to the plurality of received signals based on the determination signal. and a conversion circuit which receives the output of the successive approximation means and outputs a synchronization signal and a frequency-divided signal to the plurality of signal generation circuits.