کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7121962 | 1461471 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Realization of 2.4â¯mm coaxial microcalorimeter system as national standard of microwave power from 1â¯MHz to 50â¯GHz
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
کنترل و سیستم های مهندسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Realization of 2.4â¯mm coaxial microcalorimeter system as national standard of microwave power from 1â¯MHz to 50â¯GHz Realization of 2.4â¯mm coaxial microcalorimeter system as national standard of microwave power from 1â¯MHz to 50â¯GHz](/preview/png/7121962.png)
چکیده انگلیسی
A 2.4â¯mm 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 1â¯MHz to 50â¯GHz. An interlaboratory measurement comparison of microwave power for the validation of the 2.4â¯mm coaxial microcalorimeter system has been carried out between NPLI and Laboratoire National de Métrologie 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 â0.23 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).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Measurement - Volume 116, February 2018, Pages 106-113
Journal: Measurement - Volume 116, February 2018, Pages 106-113
نویسندگان
Saood Ahmad, Michael Charles, Djamel Allal, P.S. Negi, V.N Ojha,