Calibration method of low-temperature temperature element

Abstract

The invention belongs to the field of temperature element calibration, and in particular relates to a calibration method of a low-temperature temperature element; and the invention aims at improving the calibration efficiency of a low-temperature temperature-sensing element and lowering the calibration cost of the low-temperature temperature-sensing element. In the invention, temperature-sensing elements are connected with constant temperature copper block terminals of a cryostat through two pins, one pin of the temperature-sensing element n is connected with a NO. n+1 terminal, and the other pin thereof is connected with a NO. n+2 terminal, wherein n is a natural number larger than 1 and smaller than 41; a standard sleeve platinum resistance thermometer is connected with NO. 45-48 terminals; the constant temperature copper block terminals and the external wiring terminals on the cryostat are in one-to-one corresponding relation; and the external wiring terminals NO. n, NO. n+1, NO. n+2 and NO. n+3 correspond to an nth passage of a scanning switch, wherein n is the natural number larger than 1 and smaller than 42. The 41 temperature-sensing elements are installed in a core of the cryostat, and compared with the installation quantity of a traditional measuring method, the installation quantity is increased by nearly 3 times, and the cost can be lowered by 75 percent. The calibration method can be applied to the field of low-temperature temperature element calibration.

Description

technical field [0001] The invention belongs to the field of temperature element calibration, and in particular relates to a low temperature temperature element calibration method. Background technique [0002] Cryogenic Temperature Element - The cryogenic calibration of the temperature sensing element is done in the cryostat. There are two cold sources of the cryostat, liquid nitrogen is used as the cold source in the temperature range above 78K, and liquid helium is used as the cold source in the temperature range from 4.2K to 80K. The cryostat core structure see figure 1 . Because cryostats use expensive liquid helium, and the latent heat and heat of vaporization of liquid helium are relatively small, in order to reduce the consumption of cold sources, the volume of cryostats is set to be small, and the effective use space is also small. The measuring leads of the components are wound in the core of the cryostat and pasted on the metal surface in a large area, so that ...

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Problems solved by technology

[0004] The disadvantage of the above method is that the number of temperature sensing elements installed in one experiment is small, and a maximum of 11 can be installed at one time, so the cost of the experiment is relatively high

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