作者: Hironobu Inoue , Kazumasa Yamauchi , Yasunori Yonezawa
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摘要: PURPOSE:To achieve a smaller size of the apparatus and reduced cost, by providing transmitting/receiving ultrasonic head which transmits an wave to monitoring space according transmitting signal outputted from oscillator while receiving reflected object be detected within monitor space. CONSTITUTION:An 1 oscillates frequency in range oscillation output is applied 11 comprising piezo-electric element through impedance circuit 10 as transmission amplified with amplifier 2. The emits corresponding space, received converted into electrical combined signal. Thus, contains component reception same amplitude phase fetched part are inputted differential 12 remove component. alone extracted.