Garg, N. and Kumar, Anil and Sanjid, M. Arif and Chaudhary, K. P. and Maji, S. (2014) Reaffirmation of measurement uncertainty in pressure sensitivity determination of LS2P microphones by reciprocity method. Measurement, 51. pp. 281-288. ISSN 0263-2241

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Abstract

The paper presents the accuracy and precision associated with realization of primary standard of sound using the reciprocity method. An experimental determination of the front cavity volume on Universal Measuring Machine has lead to reaffirmation of measurement uncertainty in pressure sensitivity determination to 0.04-0.15 dB in frequency range 31.5 Hz to 25 kHz. The reduced measurement uncertainty has also been validated from the results of the recent APMP Key comparison and also by comparison to the manufacturer's value for LS2P microphones. The use of optical method for measuring the front cavity volume has refined the measurement methodology followed with adaptation of a self reliant, traceable and systematic measurement procedure in comparison to the earlier use of nominal values for sensitivity fitting exercise conducted on MP.EXE program. Consequently, the measurement uncertainty associated with the calibration of working standard microphones, multifunction acoustic calibrator and A-weighted sound pressure level measurements is also reduced.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/S Elsevier.
Uncontrolled Keywords:	Reciprocity method Front cavity depth Front cavity volume LS2P microphones MP.EXE program Sensitivity fitting exercise
Subjects:	Engineering Instruments/ Instrumentation
Divisions:	UNSPECIFIED
Depositing User:	Dr. Rajpal Walke
Date Deposited:	04 Nov 2015 07:13
Last Modified:	04 Nov 2015 07:13
URI:	http://npl.csircentral.net/id/eprint/1493

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