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Can sensors .see. underground or underwater?

April 26, 2017sensors underground underwater

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Can sensors .see. underground or underwater?

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Under very special circumstances (using long wave radar over an area that is extremely dry) it is possible to see a few metres into the ground. In Canada, where usually the ground has lots of moisture, we are limited to seeing what’s on the surface only. Some of the visible wavelengths, like blue for instance, penetrate water quite well and if the water is clear, we can see down several metres.