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1. (WO2018139192) ULTRASONIC DEVICE

Pub. No.:    WO/2018/139192    International Application No.:    PCT/JP2018/000268
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
Applicants: MURATA MANUFACTURING CO., LTD.
株式会社村田製作所
Inventors: WATANABE, Kosuke
渡辺 恒介
NAKAO, Motoyasu
中尾 元保
Title: ULTRASONIC DEVICE
Abstract:
An ultrasonic device (1) is provided with an ultrasonic transducer (100), a drive circuit (104), a reception circuit (106), a frequency detection unit (114), a frequency storage unit (118), a temperature detection unit (112), and an abnormality determining unit (119). The frequency detection unit (114) detects the resonant frequency of the ultrasonic transducer (100). The frequency storage unit (118) stores the resonant frequency of the ultrasonic transducer at a predetermined temperature. The abnormality determining unit (119) determines abnormality of the ultrasonic transducer (100) on the basis of the temperature detected by the temperature detection unit (112), a resonant frequency (fini) stored in the frequency storage unit (118), and a resonant frequency (fm) detected by the frequency detection unit (114). Consequently, the ultrasonic device capable of accurately detecting the abnormality of the ultrasonic transducer can be provided.