Patent ID: 6928369
Filing Date: 2005-08-09
Classification: G01F,G01P

Abstract:
1. A low power ultrasonic flow velocity meter comprising: burst signal generating means for generating two kinds of burst signals with a phase difference; a pair of transmission/reception ultrasonic transducers located on the upstream side and downstream side of a conduit to be measured, which receive their corresponding burst signals from said burst signal generating means, convert said burst signals, send ultrasonic waves with a phase difference into the conduit to be measured, receive ultrasonic waves sent by the other transmission/reception ultrasonic transducer and propagated through the conduit to be measured and convert the ultrasonic waves to received signals; binarizing means for binarizing the received signals from said respective transmission/reception ultrasonic transducers; phase difference measuring means for measuring a phase difference between these binarized received signals binarized by the binarizing means by a logical circuit; and flow velocity measuring means for measuring a flow velocity of the conduit to be measured based on the phase difference signal between the received signals from said phase difference measuring means.