Low-temperature radiometer for laboratory

Abstract

The invention discloses a low-temperature radiometer for a laboratory, and particularly relates to the technical field of low-temperature radiation. The low-temperature radiometer solves the problemsthat the existing low-temperature radiometer mostly uses liquid nitrogen-liquid helium refrigeration, so that the cost is high, and the number of starting up and use times is limited. The low-temperature radiometer for the laboratory comprises a refrigerating machine, wherein a primary cold head and a secondary cold head are connected onto the refrigerating machine; a vacuum support frame is arranged outside the refrigerating machine; the upper part of the vacuum support frame is connected with a vacuum cover; a primary cold screen, a secondary cold screen, a sample low-temperature cold screenand a sample table are fixed in the vacuum cover; the primary cold head is connected with the primary cold screen; the secondary cold head is connected with the secondary cold screen; the sample table is connected with the sample low-temperature cold screen; the secondary cold head is connected with a cold disc through a high-conductivity flexible cold conducting structure, and is used for isolating the vibration of the refrigerating machine; an absorption cavity heat shielding structure is arranged on the cold disc; an absorption cavity is formed in a position of the absorption cavity heat shielding structure; and an electric heating wire and a thermistor used for temperature measurement are arranged at the outer side of the absorption cavity.

Description

technical field [0001] The invention relates to the technical field of low temperature radiation, in particular to a laboratory low temperature radiometer. Background technique [0002] The core of optical radiation metrology is the measurement and measurement of the characteristics of the radiation source and the detection characteristics of the radiation detector. As the highest standard of radiation measurement, there are standard radiation sources and standard radiation detectors. As a standard radiation source, the standard black body is commonly used internationally. As the standard radiation detector, the cryoradiometer is currently recognized. [0003] The low temperature radiometer adopts advanced low temperature, vacuum and superconducting technology, and uses electric heating instead of optical radiation heating method, so that the optical calibration accuracy can reach 0.02%. The cryogenic radiometer uses the principle of electrical substitution to trace the o...

AI Technical Summary

Problems solved by technology

As a strategic resource, liquid helium is relatively expensive and scarce, which will limit the number of times of use of liquid nitrogen-liquid helium cryogenic radiometers and the use time of each startup

Images