Garg, N. and Soni, K. and Kumar, A. and Saxena, T. K. (2015) Applications of Laser Interferometry in Providing Traceable Vibration Measurements in India. Mapan , 30 (2). pp. 91-104. ISSN 0970-3950

PDF - Published Version Restricted to Registered users only Download (1268Kb) | Request a copy

Abstract

The paper discusses the advantages of laser interferometry in providing traceable vibration measurements with lowest levels of uncertainty of measurement due to which it has been established as National primary standard. The potential high precision measurements can be achieved with air bearing exciters of beryllium armature having lowest transverse motion, by special vibration isolation and by data acquisition at a high sampling rate. The national standards briefly described are mainly used for the primary calibration of reference standard accelerometers which are used in accredited calibration laboratories. Strengths, weaknesses, opportunities and threats (SWOT) analysis of laser interferometer approach is discussed. The expanded measurement uncertainty (k = 2) of 0.3 to 1.8 % in range 5 Hz to 20 kHz was re-affirmed by absolute calibration of standard reference accelerometers by laser interferometery technique using multi-point laser positions.

Item Type:	Article
Uncontrolled Keywords:	National Metrology Institute (NMI); Laser interferometer; ine approximation method (SAM); Discrete Fourier transforms (DFT); Uncertainty of measurement (UoM)
Subjects:	Instruments/ Instrumentation Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	16 Sep 2016 07:11
Last Modified:	16 Sep 2016 07:11
URI:	http://npl.csircentral.net/id/eprint/1723

Actions (login required)

View Item