subject: Anechoic Chamber: A Revolution in the World of Sound [print this page] Anechoic Chamber: A Revolution in the World of Sound
It is a specially designed sound laboratory that minimizes the sound vibrations and the external noise. Since the first sort this was built in 1940, anechoic chambers are quiet prevalent today.
How Does It Work?
These chambers are physically isolated structures that have very detailed acoustical filters in the ventilating ducts. The interior surfaces of the walls are covered with highly absorbent materials that use wedge model panels to obstruct the incoming and outgoing sound reflections.
The absorptive material can be glass fiber or mineral wool in horizontal and vertical wedges. The floors are also padded and have a thin steel mesh spread on the top to facilitate walking. The ceiling is also covered with the absorptive material so as to dissipate noise radiation as much as possible.
No wonder with the entire shield provided, anechoic chambers can absorb more than 95% of the vibrations.
Uses
Anechoic chambers are used in many areas. They are used for measuring the acoustic properties of various instruments that send electromagnetic or radiation waves. They help to read the precise amount of energy transferred to the electro-acoustic devices. Their usage in the music industry cannot be looked down as they help filter all the external sound while recording and help test microphones to measure their acoustic properties. In science and technology, they are used to conduct psychoacoustic experiments.
Merits and Demerits
Since these chambers are built to block acoustic and electromagnetic radiations, they negate any vibrations inside from outside. Their wedge shape reflects energy to its highest point so that it bounces upon impact with the panels ultimately dissipating it as vibration there within the material. These reflections of vibrations provide different frequencies and they help to test a variety of electromagnetic devices like radio.
The disadvantage of these chambers is they work successfully only in the given condition of having the entire room covered with radiation absorbent material.
Parameters to Consider While Purchasing an Anechoic Chamber
Magnitude or extent of the text component
Type of the testing setup
The noise level and interference of the surrounding
The basic structural facilities like supports and space available for the installation of the chamber
Today anechoic chambers are used for advanced research, which has lead to the development of speakers that provide virtual sound.
