Accession Number : AD0467990


Title :   NOISE THERMOMETRY AT HIGH PRESSURE.


Descriptive Note : Technical rept. no. 1,


Corporate Author : POLYTECHNIC INST OF BROOKLYN NY


Personal Author(s) : Tillinger, Martin H


Report Date : Jun 1965


Pagination or Media Count : 46


Abstract : It has long been known that the emf of thermocouples is a function of the pressure. In order to measure the magnitude of this effect at very high pressures and temperatures, the thermal noise voltage developed by a resistor can be used. This thermal noise voltage is a pressure independent, thermodynamic thermometer. The noise thermometer is a differential device which compares the noise output of two resistors, one at high pressure and the other at atmospheric pressure. In order to compare these noise outputs and hence the temperatures, the noise outputs are amplified and their magnituded are integrated. The difference between the integrated noise magnitudes is proportional to the temperature difference between the resistors. The precision of this thermometer is 0.1% at 300 K and increases at higher temperatures. (Author)


Descriptors :   *RESISTORS , *THERMOCOUPLES , NOISE , THERMOMETERS , HIGH PRESSURE , CIRCUITS , THERMODYNAMICS , BROADBAND , EQUATIONS , FOURIER ANALYSIS


Distribution Statement : APPROVED FOR PUBLIC RELEASE