--more precision--
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--more precision--
| Info | |
| APPLICATION | The unit is used to perform surveillance and record speech of a person who might be up to 300m away, in a vehicle, building, or elsewhere. The microphone picks up on surface vibrations, and it has the power to do all of this independent from the target optical conditions. The laser is unseen by human eyes or common cameras. This allows users to target those in closed rooms through windows. During operation the system eliminates ambient interferences, noises. How It Works The sensor can collect the vibrations in various surfaces, as mentioned. It can detect speech, and the best sensitivity occurs when objects are thin, soft, or lightweight. Some of the targets that could be used include papers, leaves on a plant indoors, pictures hanging on a wall, seat cushions, window panes, and clothing. The beam detects vibrations, turns them into an electrical signal and then amplifies them and creates an audible output. The vibrations, caused by a speaker, cause a backscatter laser light frequency (Doppler) shift. This shift is then extracted from the laser light. After that, the signal will pass through decoding and convertion to standard audio signal. |