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In Reply to: RE: The quietest place on earth: anechoic chamber posted by 4everyoung on October 18, 2015 at 19:09:30
In the 1980's I was sent off to work at General Motors Proving Grounds in Milford MI where we installed and tested electronically controlled dynamometers and emissions testing equipment in a large anechoic chamber for automobiles.
In one application they use the chamber to bombard the vehicle with RF energy at varying frequencies and intensities to ensure that the vehicle electronics are not affected. You don't want your car to suddenly slam on the brakes or the electronics to shut down when passing by a communications tower.
The one at GM was much larger but similar with blue absorption cones
GM Proving Grounds
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I've been in several RF anechoic chambers and a few audible freq chambers. The RF chambers are quite dead sounding, the audible freq anechoic chamber are erie.
The RF anechoic chamber at GM was audibly quiet and we had fun playing around yelling into the corners. I imagine it wasn't as acoustically quiet in the audio range as a chamber designed specifically for audio frequencies.
They used various antennas like small log periodic beams to not only blast the cars with RF but to observe the car's own RFI on spectrum analyzers. I wasn't directly involved with that testing but the GM engineers who hosted my months long visit showed me around. It was a fun place!
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