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Topic: Suggestion for measuring underwater? (Read 1 time) previous topic - next topic

alvinford


No, these transducers work at 200KHz, whereas the ones in ultrasonic modules for use in air are more commonly 40KHz.


can you suggest a cheaper way, those fishfinder have a blind spot of 2 ft and lower... my goal is to measure depth at least from 20cm up to 4ft...

dc42

The only cheaper way I can think of is to make your own ultrasonic transducers from raw piezo elements (these are available - or at least used to be - because a long time ago I used them for tuning the frequency of lasers). You would need to machine a tapered metal block to mount them on, in order to match their stiffness to the compressibility of water. And you would need to waterproof them.

Or, with help from Google, you may be able yo find some less expensive transducers designed for use underwater. Remember, it's not just that you need waterproof transducers, you also need a reasonable acoustic impedance match between the transducer and the water it is immersed in.
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alvinford


The only cheaper way I can think of is to make your own ultrasonic transducers from raw piezo elements (these are available - or at least used to be - because a long time ago I used them for tuning the frequency of lasers). You would need to machine a tapered metal block to mount them on, in order to match their stiffness to the compressibility of water. And you would need to waterproof them.

Or, with help from Google, you may be able yo find some less expensive transducers designed for use underwater. Remember, it's not just that you need waterproof transducers, you also need a reasonable acoustic impedance match between the transducer and the water it is immersed in.


hmm, It seems to be more complicated than before XD, If I happen to see or purchase a underwater Transducer 200khz, how would I drive it, how can I produce a module(Circuit) like the one in an ultrasonic transducer?

xvjeko



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