Wide-temperature-range high-precision temperature calibration device

Abstract

The invention relates to a wide-temperature-range high-precision temperature calibration device which comprises a thermal switch gold barrel, a pressure cabin and a refrigerating machine. The pressurecabin is positioned inside the thermal switch gold barrel; cold flow can be provided by the refrigerating machine, so that the internal temperature of the pressure cabin can be reduced to reach target temperatures. The wide-temperature-range high-precision temperature calibration device is characterized in that a resonant cavity is arranged in the pressure cabin, a plurality of protruded hollow cylindrical bosses are arranged on the side surfaces of the resonant cavity, and thermometers are arranged on the surfaces of the protruded hollow cylindrical bosses. The wide-temperature-range high-precision temperature calibration device has the advantages that the thermodynamic temperatures of very low temperature zones at the temperatures of 5K-25K in wide temperature ranges of 5K-300K can be measured by the aid of advanced constant-pressure gas refractive index temperature measuring methods in a high-precision manner, and accordingly reference-level thermometers and standard-level thermometers can be calibrated by the aid of the wide-temperature-range high-precision temperature calibration device.

Description

technical field [0001] The invention relates to a calibration device, in particular to a high-precision temperature calibration device in a wide temperature range. Background technique [0002] Thermodynamic temperature is the most basic parameter in the field of thermology. It is one of the seven basic units of the International System of Units. It is used to measure the degree of coldness and heat of an object on a macroscopic level, and it is used to represent the intensity of molecular thermal motion of an object on a microscopic level. Thermometers are widely used in cutting-edge scientific research, scientific research equipment development, national defense security and high-tech development, which are measured by the law of certain material properties changing with temperature, for example, rhodium-iron thermometers and cernox thermometers commonly used at low temperatures, room temperature Platinum resistance thermometers used in low temperature areas rely on the re...

AI Technical Summary

Problems solved by technology

At present, in the temperature zone below 25K, there are only standard devices in my country, which can only calibrate application-grade thermometers. Usually, the calibration accuracy is 5mK-100mK, which cannot meet the urgent needs of high-precision temperature measurement in China; Every year, it needs to be sent to a foreign reference device for calibration, which is not self-controllable; in addition, the traditional temperature calibration device also has problems such as narrow calibration temperature range, short temperature control time, and poor accuracy, which seriously affects the demand for high-accuracy temperature measurement. One of the bottlenecks restricting the rapid development of frontier scientific research, scientific research equipment development, national defense security and high-tech development

Images