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1. (WO2018139193) ULTRASONIC DEVICE

Pub. No.:    WO/2018/139193    International Application No.:    PCT/JP2018/000269
Publication Date: Fri Aug 03 01:59:59 CEST 2018 International Filing Date: Thu Jan 11 00:59:59 CET 2018
IPC: H04R 3/00
G01S 7/52
G01S 7/521
G01S 7/526
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: NAKAO, Motoyasu
中尾 元保
WATANABE, Kosuke
渡辺 恒介
Title: ULTRASONIC DEVICE
Abstract:
An ultrasonic device (100) is provided with an ultrasonic transducer (120), a transmitting circuit (110), a receiving circuit (140), a Q value measuring circuit (210), and a frequency measuring circuit (250). The ultrasonic transducer is a terminal-type ultrasonic transducer having a transmitting electrode (121), a receiving electrode (122), and a common electrode (123). The transmitting circuit outputs a drive signal to the transmitting electrode and transmits an ultrasonic wave from the ultrasonic transducer. The receiving circuit receives a reception signal from the receiving electrode. The frequency measuring circuit measures the resonant frequency of the ultrasonic transducer from a reverberation signal of the reception signal. The Q-value measuring circuit measures the Q value of the ultrasonic transducer from the reverberation signal of the reception signal.