Honda Electronics Co., Ltd.

Hiromasa Tomura

Kenji Nagareda

Yuki Murai

Katsuyuki Inagaki

Yuya Ishiguro

A flowmeter sensor can stably measure in a wide temperature range including one over 100° C. The flowmeter sensor includes an ultrasonic transducer, a pipe, and an acoustic prism. The acoustic prism has a bottom surface that is arranged in contact with the outer peripheral surface of the pipe and a front-side inclination surface that supports the ultrasonic transducer. The acoustic prism propagates ultrasonic waves from the ultrasonic transducer toward the fluid within the pipe. The pipe is made of a first heat-resistant resin having heat resistance in a temperature range of 90° C. to 200° C. and negative thermoacoustic characteristics in which the ultrasonic transmittance decreases as the temperature rises in such a temperature range. The acoustic prism is made of a second heat-resistant resin having heat resistance in the temperature range and positive thermoacoustic characteristics in which the ultrasonic transmittance increases as the temperature rises in such a temperature range.

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Aichi, Japan

Hiromasa Tomura