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Topic: Ultrasonic Sensor question. (Read 352 times) previous topic - next topic

nz005

Oct 19, 2017, 09:05 am Last Edit: Oct 19, 2017, 05:53 pm by nz005
I'm doing an Underwater ROV for my final year project and would like to include an ultrasonic sensor (specifically JSN-SR04) attached to my ROV. Will that ultrasonic sensor works well under-water or not? This sensor is the best for my project because it's less expensive than any other waterproof ultrasonic sensors out there. Also, if it does works well under water, do I need to do some waxing on some part of the sensor? Thanks.

Paul_KD7HB

Did your research show ANY hint the device could be used under water?

Paul

MarkT

#2
Oct 21, 2017, 01:18 pm Last Edit: Oct 21, 2017, 01:19 pm by MarkT
The acoustic impedance of water is 3000 times higher than air, you _have_ to use a hydrophone for
underwater sonar, its just so very different from air.  Also you need very high frequencies for any
resolution as the speed of sound is 4.5 times higher too.  Sonar kit is, I believe, expensive.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

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