Acoustics Standard maintains the primary standard of sound pressure level and vibration amplitude. The primary standard of sound pressure level is maintained using the Reciprocity Microphone calibration technique while that of vibration amplitude is maintained using the primary vibration calibration facility. The secondary calibration of accelerometers, vibration meters, sound level meters, sound calibrators, pistonphones and tachometers is carried out for different R&D organizations. Consultancy services are being rendered to industries for Building Acoustics, Noise and Vibration control and its abatement. Apart from this, the Type approval (T.A) and Conformity of Production (C.O.P) is being carried out for the Diesel generating sets as per the CPCB norms.

The Ultrasonic Standards continued to provide services to the industry for calibration of Ultrasonic Non-destructive testing equipment and ultrasonic medical equipments. Calibration procedure was developed for ultrasonic response and dimensional accuracy of test rails as per Euro norms for the on-line ultrasonic inspection of the rails manufactured in India for high-speed trains along with high volume of traffic. In another significant work, ultrasonic velocity has been measured at different pressures in various liquids varying from 0 bar to 7000 bar. A facility has also been created for study of ultrasonic dispersion in liquids at different temperatures (Fig. 1.9).

An ultrasonic method was developed and used for calibrating the hole flatness and depth in steel block, having FBH holes at non-zero angles.

NABL started a Proficiency testing program in ultrasonic testing. NPL is a nodal laboratory. It has to make the artifact also. Steel blank has been prepared. They have been tested ultrasonically for zero defects. The design of defects has been made. Artificial defects in the form of holes and notches have been made in the artifact. These have been tested for homogeneity test.

The section is involved in acoustic profiling of atmosphere by SODAR. Site specific SODAR observations pertaining to coastal regions of Paradeep Orissa were analyzed in relation to EIA. Similar studies for Tata Nagar and Keonjhar are in progress.

Three prestigious consultancies were completed successfully for Delhi and Bangalore Metro and one for multipurpose hall design in Lucknow.