The spectral density of the noise voltage S^sub 0^ could be described by the expression  where k is the Boltzmann constant. [...] the determination of a noise-voltage square mean value could be carried out also due to the spectral density of the noise voltage, according to the formula : Standard resistance thermotransducers as well as specially developed ones with individual characteristics (a temperature measurement range, the nominal value of the sensitive element resistance, an individual conversion function and etc.) could serve as a primary transducer (PT) of a noise thermometer (NTh).
Sensors & Transducers Journal, Vol. 117, Issue 6, June 2010, pp. 85-91 Sensors & Transducers ISSN 1726-5479 © 2010 by IFSA http://www.sensorsportal.com Compensation of a Primary Transducer Resistance Alteration by Changing the Amplitude-Frequency Characteristics of a Noise-Thermometer Input Circle Bogdan STADNYK, Ihor MYKYTYN National University ‘Lviv Polytechnic’ Institute of Computer Technologies, Automation and Metrology Bandera str. 12, 79013 Lviv, Ukraine Tel.: +38 0322 375089 E-mail: email@example.com Received: 6 May 2010 /Accepted: 21 June 2010 /Published: 25 June 2010 Abstract: Method of compensation for the influence of a primary transducer resistance temperature alteration upon the determination of a noise-voltage square mean value, proportional to the measured temperature, by changing the Amplitude-Frequency Characteristics (AFCh) of a noise-thermometer input circle. Copyright © 2010 IFSA. Keywords: Temperature, Measurement error, Noise tension, Metrological descriptions, Transformation function 1. Setting the Task The underlying basis of noise thermometry encloses Nyguist dependence  of the noise-voltage square mean value U 2 at a resistor on the temperature T , the noise-voltage frequency range f and the resistor active resistance value R : U 2 4kTRf , (1) The spectral density of the noise voltage S0 could be described by the expression  85 Sensors & Transducers Journal, Vol. 117, Iss
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