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Priority to JP1987097015UpriorityCriticalpatent/JPH0733186Y2/en
Publication of JPS642188UpublicationCriticalpatent/JPS642188U/ja
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Publication of JPH0733186Y2publicationCriticalpatent/JPH0733186Y2/en
Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves
(AREA)
Description
【図面の簡単な説明】[Brief explanation of the drawing]
第１図はこの考案の一実施例を示す回路図であ る。第２図は送受波器の周波数―インピータンス 特性曲線である。第３図は信号波形図である。
FIG. 1 is a circuit diagram showing an embodiment of this invention. Figure 2 shows the frequency-impedance characteristic curve of the transducer. FIG. 3 is a signal waveform diagram.
Claims (1)
【実用新案登録請求の範囲】
各々異なる送信周波数を有する複数の送受波器 を備えてなる送受信回路と、
該送受信回路の受信側に接続される１つの混合 器と、
送受波器の選択に連動して該送受波器の送信周 波数より一定周波数だけ高い（低い）局発周波信 号を上記混合器に送入する局発と、
上記混合器出力から差又は和周波の一方の信号 を抽出するフイルターとから成る超音波送受信装 置。[Claims for Utility Model Registration] A transmitting/receiving circuit comprising a plurality of transducers each having a different transmission frequency, one mixer connected to the receiving side of the transmitting/receiving circuit, and linked to the selection of the transducer. a local oscillator that sends a local oscillator frequency signal higher (lower) by a certain frequency than the transmission frequency of the transducer to the mixer; and a filter that extracts either a difference or sum frequency signal from the output of the mixer. An ultrasonic transmitting and receiving device consisting of.