Garg, Naveen and Sharma, Omkar and Kumar, Ashok and Schiefer, Mark I. (2012) A novel approach for realization of primary vibration calibration standard by homodyne laser interferometer in frequency range of 0.1 Hz to 20 kHz. Measurement, 45 (8). pp. 1941-1950. ISSN 0263-2241

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Abstract

The paper discusses the primary vibration calibration standard of NPL, India capable of calibrating the reference accelerometers in frequency range from 0.1 Hz to 20 kHz as per ISO 16063-11. The excitation subsystem produces constant vibration at a specified amplitude and frequency, while the measurement system uses NI interface for measuring the quadrature output. The acceleration level and voltage level at the calibration frequency f is determined by applying a Discrete Fourier Transform to the voltage and displacement signals, and then examining the spectral component at frequency f. A PC-based data acquisition system acquires the accelerometer voltage signal and analog quadrature interferometer photodetector signal pair as well as a digital quadrature pair whereby the software processes the demodulated photodetector signals to reconstruct the armature displacement. The validation of the calibration results for standard reference accelerometers with manufacturer results and uncertainty in calibration in entire frequency range 0.1 Hz to 20 kHz is reported in the present work.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Engineering Instruments/ Instrumentation
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	05 Feb 2020 10:57
Last Modified:	05 Feb 2020 10:57
URI:	http://npl.csircentral.net/id/eprint/3709

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