Compensation of a Primary Transducer Resistance Alteration by Changing the Amplitude-Frequency Characteristics of a Noise-Thermometer Input Circle by ProQuest

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									                     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: mykytynip@ukr.net


             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 [1] 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  4kTRf ,                                                (1)

The spectral density of the noise voltage S0 could be described by the expression [2]


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                      Sensors & Transducers Journal, Vol. 117, Iss
								
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