Electronic fluid flow meter

摘要

PCT No. PCT/AU92/00314 Sec. 371 Date Mar. 15, 1994 Sec. 102(e) Date Mar. 15, 1994 PCT Filed Jun. 25, 1992 PCT Pub. No. WO93/00569 PCT Pub. Date Jan. 7, 1993An electronic fluid flowmeter includes an LSI digital device and an LSI analog device. The digital device drives a pair of acoustic transducers to transmit acoustic waves within a fluid, the flow of which is being measured. The acoustic waves are received within the analogue device, the moment of arrival being determined by envelope detection associated with the phase of the received signal. The reception of a signal stops a counter within the digital device, the value in the counter representing the time of flight of the acoustic signals within the fluid. Fluid flow data can be stored on an EEPROM from which meter data can be read using a liquid crystal display or via an interface port to an external device.