Acoustic Test Facility of CSIR-NAL established in the year 1986 is a national facility for acoustic environment qualification testing of satellites, launch vehicle stages and their subsystems for the ISRO. The ATF has a 1100 cu.m reverberation chamber in which a maximum sound pressure level of 157 dB (Spectrum controlled) can be generated. It has performed more than 4000 blowdowns over 145 acoustic test programme for the Department of Space.
Qualifying launch vehicle stages and spacecraft for the noise environments encountered during take-off and transonic flight by simulating their acoustic spectrum in a reverberation chamber
Testing chamber features:
Volume (cu.m) : 1100
Dimensions (l x b x h – mtr) : 10.33 x 8.2 x 13
Maximum Overall
Sound Pressure Level (OASPL) dB: 157 (Ref. 20µ Pa)
Frequency range (Hz) : 25 – 10,000
Spatial Distribution OASPL (dB) : +/- 1 in central 10% volume
Data acquisition& analysis system:
Real-Time acoustic spectrum control & measurements: 16 channel
Vibration measurement : 192 channel
Strain measurement : 16 Channel
Clean room facility : 100,000 Class
Calibration facility:
Calibration of acoustic sensors at octave frequencies ranging from 31.5 Hz to 8 kHz, with acoustic levels up to 160 dB
Design & development:
- Design & establishment of large size reverberation chamber for acoustic testing of spacecraft & launch vehicle stages
- High intensity acoustic sensor calibrators High frequency air jet noise sources
