Showing papers by "Hajime Miyata published in 2012"

Ultrasonic gas meter

Abstract: PROBLEM TO BE SOLVED: To provide an ultrasonic gas meter for measuring a flow rate for a short period, discriminating an appliance, monitoring the safety, and implementing an accurate measurement in a low current consumption. SOLUTION: The ultrasonic gas meter comprises: a transmitting means 2 for transmitting an ultrasonic signal; a receiving means 3 for receiving the ultrasonic signal; a direction switching means 3 for switching the transmitting means and the receiving means, and changing the transmitting/receiving direction of the ultrasonic signal; a measurement control means 1 for measuring a propagation time in the direction indicated by the direction switching means until the ultrasonic signal transmitted from the transmitting means is received by the receiving means, and implementing a propagation time measurement for a period T2 as 1/N of a normal period T1; a calculating means 1 for obtaining the flow rate from the propagation time measured for the period T2; a safety logic operating means 6 for determining whether the gas flow rate is abnormal or not from the flow rate obtained by the calculating means 1; a calculating means 2 for obtaining the flow rate from the propagation time measured for the period T1; an accumulating means 8 for accumulating a result from the calculating means 2; and a minute leakage sensing means 9 for detecting a minute leakage. COPYRIGHT: (C)2010,JPO&INPIT

Ultrasonic flow measurement unit and manufacturing method therefor

Abstract: PROBLEM TO BE SOLVED: To provide an ultrasonic flow measurement unit that is excellent in mass productivity and by which a flow rate can be highly accurately measured.SOLUTION: An ultrasonic flow measurement unit has a configuration in which a pair of ultrasonic transceivers 5, 6 and a measurement circuit 8 are arranged so as to abut against a part of a flow passage, the pair of ultrasonic transceiver 5, 6 each having at least a piezoelectric body 17 and an acoustic matching body 15 being arranged the flow passage so that an ultrasonic wave can be transmitted and received, and a measurement circuit 8 calculating a flow rate on the basis of propagation time between the pair of ultrasonic transceivers. In the ultrasonic flow measurement unit, the abutting surface of the ultrasonic transceiver with the flow passage, the outer periphery of the piezoelectric body and at least a part of the measurement circuit are formed integrally and simultaneously with an insulating vibration control member 13 so as to give a certain adhesive strength. By this, housing propagation noise generated by vibration in one ultrasonic transceiver that is transmitted to another ultrasonic transceiver through the flow passage or the measurement circuit and reverberation noise induced by vibration transmitted to each member can be efficiently reduced, achieving highly accurate flow rate measurement.