Temperature measurement using thermal noise conducting objects

Introduction. A noise method of temperature measurement is widely used in engineering and science. The disadvantage of noise methods is dependent measurement results of the resistance of the object.Main part. In conducting object is always present thermal noise. He called the velocity fluctuations of electric charge carriers. The paper shows the possibility of electrically conductive object temperature measurement by assessing their own thermal noise. The structure of the construction of the noise temperature of the meter and the algorithm of its work. The scheme includes the following elements: lead object, separate capacitors, transformer, broadband amplifiers, multiplier, low-pass filter and voltmeter. RMS noise voltage is determined by the Nyquist formula. The algorithm of the measuring system eliminates the effect of the resistance of the object on the measuring result. Limiting thermal noise band occurs in the resonant circuit. This eliminates the noise correlation own band amplifiers. The scheme allows for the measurement of low temperatures in the low-thermal noise.Conclusions. The independence of the measurement results of temperature resistance thermal noise source allows refusing sensors. Considered measuring the temperature comfortable in when placing sensors at the site difficult.