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The plasma microphone is a little bit similar to Rydberg-sensor.

The plasma microphone is a little bit similar to Rydberg-sensor.


Plasma, laser, and radar microphones are the tools of tomorrow. In plasma-based microphone is the chamber where is hovering plasma. The chamber observes the movement of plasma by radio waves, which have the same polarity as plasma.  

When a soundwave hits the chamber, it will change its form, and the radar can detect the interactive movement with the plasma and the chamber. So that thing can make it possible to make more sensitive microphones than ever before. 

If that kind of system wanted to transform the laser-use. The inside layer of the chamber can cover by laser-LEDs and photovoltaic cells. The system detects the change of the form of the chamber when the soundwaves are hitting it. And then those small movements of the wall of the chamber can transform to sound. 

Radar and laser microphones are multi-use tools. The same lasers that are used in laser microphones, can use to point the targets on the battlefield and as communication tools. So that makes those systems multi-use tools. By using laser microphones the satellite can detect speak of people from the orbital trajectory. 

Radar microphones can use radar to see the resonance of the windows. But those systems can also benefit the things like walls for observing the resonance what the speaking between people causes. The laser and radar microphones are almost identical systems, only the frequency of radiation, which is used to make observations are different. Laser microphones can aim also at houses, and they are hearing voices through the walls. 

Laser microphones can install in drones and quadcopters, as well as in normal helicopters and aircraft. They can detect voices from the rooms from very great distances. If the laser microphones are installed in satellites, they can hear everything that is spoken in rooms from the orbital trajectory if the laser ray will aim at windows.  

But laser microphone can also look like a normal directional microphone. In that kind of system, the movement of the membrane will detect by using laser rays. That kind of system might be very sensitive even that kind of system would not aim any laser rays to the house. 

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