Murata Manufacturing Co., Ltd.

Chitaka Ochiai

Noriaki Okuda

Koichi Watanabe

Masaharu Kota

Junshi Ohta

A loop flow-path is formed by providing a partition in the path of flow of a fluid duct. An incoming flow-path and an outgoing flow-path are provided with the fluid duct through connecting ducts, and a gas G flows in the fluid duct. An ultrasonic sensor having two opposing surfaces for transmission and reception is disposed in a part of the loop flow-path so that ultrasonic waves to be transmitted and receive have vector components in the direction of the loop flow-path. The ultrasonic waves outputted from the two opposing surfaces of the ultrasonic sensor travel in opposite directions to each other in the loop flow-path, one ultrasonic wave with the flow of the gas and the other ultrasonic wave against the flow of the gas, and are received on the opposite surfaces of the sensor, respectively.

Ultrasonic flowmeter and gas flowmeter using the same

An ultrasonic flowmeter includes a fluid duct including therein first and second flow-paths separated by a partition and an ultrasonic sensor provided at one end of the fluid duct. A reflecting plate provided at the other end of the fluid duct reflects ultrasonic waves generated by the ultrasonic sensor and reaching the reflecting plate through the first and second flow-paths, and returns the ultrasonic waves to the ultrasonic sensor through the second and first flow-paths, respectively, which are different from the first and second flow-paths, respectively, through which the ultrasonic waves have reached the reflecting plate. The ultrasonic flowmeter also includes first and second connecting flow-paths communicating with the first flow-path at the vicinity of one end and the other end, respectively, of the fluid duct.

Ultrasonic flowmeter for measuring the flow rate of a gas or liquid by using an ultrasonic sensor

An electric potential sensor, having: a power source including a first output terminal having a first electric potential, a second output terminal having a second electric potential; a first and a second potential dividing elements connected in series between the first output terminal and the second output terminal; a ground node connected to a mutual connection node of the first potential dividing element and the second potential dividing element; a first resistance element connected between the ground node and an output node; a second resistance element connected between the output node and a detection node; a transistor connected between the first output terminal and the detection node; a pickup device for controlling a base current or a gate voltage of said transistor such that an electric potential of the detection node is equal to an electric potential of a measuring object; and a third resistance element connected between said detection node and the second output terminal.

Electric potential sensor

An ultrasonic sensor has a built-in temperature compensation capacitor housed in a casing and facilitates an inside-the-casing lead-wire bonding connection process and a connection verifying process while increasing reliability. The ultrasonic sensor is provided with a piezoelectric vibration element and a capacitor for temperature compensation capacitor both housed in a casing. The temperature compensation capacitor includes a pair of electrodes located on one common surface of a dielectric body thus allowing the ultrasonic sensor to be electrically connected to lead wires on the one common surface.

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Omihachiman, Japan

Chitaka Ochiai