Ahmad, Saood and Charles, Michael and Allal, Djamel and Negi, P. S. and Ojha, V. N. (2018) Realization of 2.4mm coaxial microcalorimeter system as national standard of microwave power from 1 MHz to 50 GHz. Measurement, 116. pp. 106-113. ISSN 0263-2241

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Abstract

A 2.4mm coaxial microcalorimeter system based on thermoelectric principle has been realized as a national standard of microwave power at National Physical Laboratory India (NPLI). The design is based on two symmetrical and thermally isolated transmission lines, one connected to power standard and the other connected to an identical power standard used as a thermal reference. The main function of the system is to determine the temperature variation between the two power standards, which is of the order of few milli-Kelvin, using a specially designed thermopile. The coaxial microcalorimeter along with the thermocouple power sensor will provide traceable measurements from 1 MHz to 50 GHz. An interlaboratory measurement comparison of microwave power for the validation of the 2.4mm coaxial microcalorimeter system has been carried out between NPLI and Laboratoire National de Metrologie et d'Essais (LNE) France. The difference between the effective efficiency evaluated by the two laboratories was less than 0.5% at all frequency points. The normalized error value of NPLI for effective efficiency varies between -0.23 and +0.09 with respect to LNE. The result shows good agreement in assigning the effective efficiency to power sensor among the two labs within their claimed expanded uncertainty. It proves the degree of equivalence in measurements between two national metrology institutes (NMIs).

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Engineering Instruments/ Instrumentation
Divisions:	UNSPECIFIED
Depositing User:	Mr. Yogesh Joshi
Date Deposited:	27 Sep 2019 08:32
Last Modified:	27 Sep 2019 08:32
URI:	http://npl.csircentral.net/id/eprint/3938

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