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REVERBERATION ROOMS 

 


We designs Reverberation Rooms to make sure about sound power level of noise sources, transmission loss of partitions, insertion loss of silencers, response characteristics of microphones, and random incidence absorption coefficients of materials .

Reverberation Rooms are used for high-intensity noise-level fatigue testing of aircraft, space vehicles, and other heavy equipment with fully satisfy reverberation requirements and also meet specific interior acoustic sound levels and other environmental requirements as well .

In addition, rooms are designed to provide appropriate working spaces, sizes and types of doors, lighting and electrical systems, climate controls, as well as RF shielding appropriate to the work intended.

All these elements are assembled within an engineered modular structural framework, to assure the overall integrity of the Reverberation Room. With the Envirotech Systems’ Component System, virtually any size room can be created.

Preferred Minimum Room Volume as a function of Lowest Frequency Band of Interest*

Lowest Frequency Band of Interest

Room Volume

Ft3

M3

125 Hz Octave or 100 Hz one-third octave

7062

200

125 Hz one-third octave

5297

150

160 Hz one-third octave

3531

100

250 Hz octave or 200 Hz one-third octave or higher

2472

70


Envirotech Systems has installed many field-proven reverberations rooms in rectangular configurations. 


A reverberation chamber is used in precision-grade sound power measurements, such as ANSI S12.31 and ISO 3741, and in sound absorption measurements, such as ASTM C423 and ISO 354. Such a chamber consists of a high-transmission loss envelope with sound reflective interior cladding. All measurements are made in the reverberant field of the sound source.

For Sound Absorption Testing

All surfaces are intentionally made reflective, with an average absorption coefficient of 0.05 or less required at all frequencies after allowance for air absorption. The volume of the chamber must be greater than 125 m3 and should be 200 m3 or greater. Room dimensions shall not be ratios of small integer numbers, nor shall the ratio of the largest to smallest room dimension exceed 2:1. Sound-reflective diffusing elements are required to be suspended in the chamber, and it is strongly recommended that some of them be kept moving during tests. The number and surface area of diffusers may be determined empirically using a qualification procedure. Otherwise, the surface area of the diffusers (both sides) should be at least 25% of that of the host chamber.

The ideal dynamic range of the measurement in each one-third octave band is on the order of 45 dB. Note that in order to be able to measure simultaneously in all bands, the dynamic range requirement must also be met in all bands simultaneously.

For Sound Power Testing

The requirements are similar, but the room volume should be 100 times the source volume for precision-grade testing. Also, additional sound absorption is required at frequencies below 200 V1/3, where V is the volume in cubic meters.




 

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News & Events
The Polycarbonate Noise Barriers' work was completed by Envirotech in a good manner and also according to our specifications.
Shree Cement Limited  ....

Acoustic Enclosure supplied by Envirotech, has fulfilled CPCB Norms without affecting DG set performance.
PepsiCo India Holding Pvt. Ltd  ....

The Noise Test Booth designed by Envirotech (ESPL) has acieved the desired noise level i.e 35 dB(A) in side the chamber.
Maruti Suzuki Limited  ....

The design of Anechoic Chamber has fulfill our requirement & no echo generation was found inside the chamber .
Dongyong  ....

 

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