Analyses Of Heat Sink In Low Temperature Measurement

First, the development of the low-temperature technology is reviewed in the paper, the most means is simply introduced to obtain the low temperature and infinitesimal temperature, and the application of low-temperature technology is introduced. In succession, the paper calculated and analyzed size effect of heat sink in the low-temperature measurement.To reduce the amount of heat load in the thermometer due to electrical leads of heat conduction and improve the accuracy of temperature measurement, it is very important and virtual to utilize heat sink. The paper analyzed and discussed one-dimensional and two-dimensional heat sink in theory.The result of calculation in one-dimensional heat sink shows that the length of heat sink is reduced with increasing electrical leads. In this way, heat load of thermometer is reduced, so as to guarantee the precision of temperature measurement. In this paper, we analyzed and discussed size effect of two-dimensional heat sink in theory. The result of calculation and analysis indicates that two-dimensional heat sink is better than one-dimensional one. Various kinds of leak heat and size of heat sink are particularly discussed in the use of heat sink. Device of one-dimensional heat sink is calculated and analyzed in big electric current and low-temperature, and the relationship been discussed among the length of one-dimensional heat sink, electric current and the length of electrical leads, self-heating of the electrical leads and the heat sink must be calculated in the device of heat sink, it is much shorter and thicker, it is much better that electrical leads connect temperature sensor and heat sink, so as to reduce the heat load on the thermometer.The result of calculation and analysis indicates that in the low-temperature experimental measurement, it is necessary and effective to use heat sink, especially in two-dimensional heat sink. The heat sink can effectively guarantee the reducing of the heat load on the thermometer, and improve the accuracy of temperature measurement.