Having been looking for said transducers, I've come across both receive and transmit versions of seemingly similar products. I would've thought that due to reciprocity, a so called transmitter could receive just as efficiently.
Could somebody enlighten me on the difference please? All I can gather really is slightly wider receiver bandwidths.
Examples Receiver: http://uk.farnell.com/prowave/400sr100/receiver-ultrasonic-40khz-10mm/dp/1007342
Transmitter: http://uk.farnell.com/prowave/400st100/transmitter-ultrasonic-40khz/dp/1007341
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