Transceiver

The present invention provides a transceiver comprising: a vibrator having a radiation surface and emitting ultrasonic waves from the radiation surface; and a flow guide cover which is disposed on theoutside of the vibrator, the distance between the radiation surface of the vibrator and the inner surface of the flow guide cover being twice the sum of the integral multiple of the wavelength of theultrasonic wave and the half wavelength of the ultrasonic wave. Through the structure, the source level and the conversion efficiency of the wave transceiver can be improved even if the flow guide cover is installed. 本发明提供一种收发波器，包括：振动子，具有放射面，并从所述放射面放射超声波；以及导流罩，配设在所述振动子的外侧，所述振动子的所述放射面到所述导流罩的内面的距离的两倍为所述超声波的波长的整数倍加上所述超声波的半波长。通过此结构，即使装设导流罩，收发波器的源水平和变换效率也可以提高。