ULTRASONIC TRANSMITTER-RECEIVER

To provide an ultrasonic transmitter-receiver that easily receives ultrasonic waves with high sensitivity.SOLUTION: An ultrasonic transmitter-receiver 10 comprises: a transmitter 11 that transmits ultrasonic waves; and a plurality of receivers 21, 22, 23 that receive reflection waves from an object X of the ultrasonic waves transmitted from the transmitter 11. The receivers 21, 22, 23 have a reception characteristic that identifies the sensitivity indicating the level of amplifying the reflection waves at each frequency of the received reflection waves and has the maximum sensitivity at the center frequency included in the frequencies of the received reflection waves. In the reception characteristic, a particular frequency band in which the sensitivity is a half or more of the maximum sensitivity is included in the frequency band. In the plurality of receivers 21, 22, 23, their center frequencies vary such that the particular frequency bands are consecutive.SELECTED DRAWING: Figure 3 【課題】超音波を高感度で受信し易い超音波送受信器を提供する。【解決手段】超音波送受信器１０は、超音波を送信する送信器１１と、送信器１１から送信された超音波の対象物Ｘによる反射波を受信する複数の受信器２１，２２，２３と、を備えている。受信器２１，２２，２３は、受信する反射波の周波数ごとに反射波を増幅する度合いを示す感度が特定されるとともに、受信する反射波の周波数に含まれる中心周波数で感度が最大となる受信特性を有する。受信特性において、最大の感度の半分以上の感度となる特定周波数帯域が周波数帯域に含まれている。複数の受信器２１，２２，２３において、特定周波数帯域が連続するようにそれぞれの中心周波数が異なっている。【選択図】図３