Technology Groups > Ocean Acoustics and Modelling > Facilities

Acoustic Test Facility

A state-of-the-art Acoustic Test Facility (ATF) has been set up at NIOT to cater to the needs of testing and calibration of marine instruments of NIOT and other National Research Laboratories, Institutes and Industries. This facility has obtained an ISO/IEC 17025:2005 accreditation from National Accreditation Board for Testing and Calibration Laboratories (NABL) for testing and calibration parameters of underwater acoustic transducers. This facility is used to evaluate acoustic and electrical measurements include spectrum analysis of noise sources and scattering measurements on objects. Acquired data can be processed through various analysis techniques such as FFT and spectrum analysis. It consists of Acoustic Tank, Acoustic Calibration System (ACS) and Acoustic Transducer Positioning System (ATPS). Acoustic transducers are characterized using comparison calibration and reciprocity calibration techniques.

This test facility is equipped with a full complement of both digital and analog test equipment, capable of performing the following:

Receiving sensitivity Transmitting Voltage/Current Response Impedance/Admittance/Phase vs. Frequency Power / Source level Linearity Transmit and Receive Beam Patterns Frequency Analysis

Acoustic tank with Positioning system

Reciprocity calibration setup

Services

The Acoustic Test Facility, NIOT provides a unique range of facilities and measurement services to meet the individual measurement needs of the customer.

ATF, NIOT currently provides the following underwater acoustics calibration and testing services:

Free-field calibration of hydrophones by the reciprocity calibration method upto 100 kHz. Free-field calibration of under water acoustic transducers and hydrophones by a comparison method upto 100 kHz. Directional response measurement of hydrophones and transducers in the frequency range upto 100 kHz over 360 degrees of rotation. Transducer electrical impedance / admittance in the frequency range of 100Hz to 1MHz. Power / Source level measurement of transducers. Sound pressure level measurement and frequency analysis

Other measurements include, for example, transducer electrical impedance/admittance, directional response/beam patterns of transducers and transducer efficiency.

Quality and Accreditation

ATF, NIOT is committed to provide a quality service to all users

ATF QUALITY POLICY

“ The Acoustic Test Facility at National Institute of Ocean Technology is committed to ensuring accurate, continuous improvement on timely testing and calibration of Acoustic Instruments / Transducers / Parameters to National International Standards. ”

Accredited Calibration Services (accredited to ISO17025 by NABL)

ATF, NIOT currently provides the following underwater acoustics calibration and testing services accredited to ISO17025 :

Free-field calibration of hydrophones by the reciprocity from 3 kHz to 100 kHz. Free-field calibration of underwater acoustic transducers and hydrophones by a comparison method from 3 kHz to 100 kHz. Directional response measurement of hydrophones and transducers in the frequency range 3 kHz to 100 MHz over 360 degrees of rotation. Transducer electrical impedance. Power measurement of transducers.