Reciprocal Transducer?

Hi,

I have two similar piezoelectric ultrasonic transducers and I have to calculate the transmit and receive sensitivity. I have a small tank and I can calculate the receive sensitivity by comparing my transducer with the calibrated hydrophone. For the transmit sensitivity can I assume that it is equal to the receive sensitivity?

Thanks

Regards

I don't see how transmit and receive sensitivity can be equal. Unit of transmit sensitivity is sound pressure at distance x for transmitter voltage y, receiver sensitivity is received voltage for sound pressure x.

I mean the magnitude only. I read it in few papers that if the transducer is reciprocal, then the receive sensitivity is 'identical' to the transmit sensitivity at some frequency i.e.
|Velocity / Current| = |Voltage / Force|

Sorry for the confusion.

Thanks

I see, you mean same frequency response in RX and TX. It can be expected if the terminating impedance is the same in both cases.

Interesting question. Non-reciprocal behavior can be observed in cases where the media has gyrotropic/anisotropic properties. In principle, the transducer is also a part of the media, so even if your media is a vacuum (besides the transducer itself), reciprocity is not guaranteed, especially when the transducer is polarized. I'm not familiar enough with piezo physics to give a solid answer though.

However it has been reported that many media (including many human tissues) exhibit anisotropic properties to acoustic waves.