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An anechoic chamber is used for either acoustic measurements or electromagnetic / RF measurements. Acoustic anechoic chambers do not allow reflection of sound waves inside the chamber and do not allow sound waves coming from outside. Electromagnetic/ RF anechoic chambers do not allow the reflection of electromagnetic waves inside the chamber and do not allow electromagnetic waves coming from outside.
Why anechoic chamber is used?
The main purpose is to create a reflection-free and noise-free test
and measurement environment. Performing tests inside an anechoic
chamber give you much more reliable and accurate results when
compared to testing outside.
Acoustic and electromagnetic measurements are the measurements of the strengths of frequencies. But, when performing these measurements, how will you avoid reflections from other objects, interfering signals or noise? You have to use special materials that absorbs unwanted signals and shielding that prevents interfering signals or noise.
There are three main types of acoustic test chambers:
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