Answers to Readers' Questions on Sound Detection. Also refer to physical science, ear, hearing, microphone, vibration, process, electrical signals, amplified, music, loud sounds, spy devices, laser, School for Champions. Copyright © Restrictions
Answers to Readers' Questions on Sound Detection
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Using high frequency sound to detect explosives
Question
October 26, 2010
We are in an engineering design course and are considering making a device that can detect explosive devices buried beneath the ground. We are fairly certain that these devices are non-metallic and we believe there must be a way to detect these objects. The detector should not be touching the ground and therefore the sound must travel through air as well as the ground. Would a high frequency sound be a good starting point for detecting the reflected signal?
David - USA
20581
Answer
Ultrasound can be used to detect objects in a fluid environment, such as underwater, but using sound is not effective for underground devices because of the variations in the soil.
Most devices used to detect non-metallic explosives use radio waves or radar. Some devises detector molecules from the explosive materials.
One article on the subject is at:
http://www.defensenews.com/story.php?i=4468302
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Answers to Readers' Questions on Sound Detection