3 results about "Blackbody cavity" patented technology

This invention relates to a protective device for a low-temperature blackbody radiation source, belonging to the field of low-temperature radiation metrology and calibration technology. It solves the problem in existing technologies where the temperature inside the blackbody cavity is easily affected by the external environment when calibrating infrared instruments and equipment using a low-temperature blackbody radiation source, leading to temperature instability within the blackbody cavity. The invention includes a protective body, a piping assembly, and a cap. The protective body has a protective cavity extending through it, with one end connected to the opening of the blackbody cavity and the other end serving as a measuring end. The cap is positioned at the measuring end of the protective cavity. The protective cavity is connected to an external dry nitrogen source via the piping assembly, which supplies both low-temperature and room-temperature dry nitrogen to the protective cavity, isolating the blackbody cavity from the external environment. This invention effectively isolates the blackbody cavity from the external environment, preventing external environmental influences on the temperature inside the blackbody cavity and maintaining its stability.

This invention provides a liquid metal homogenizing blackbody furnace based on induction heating, belonging to the technical field of infrared radiation temperature measurement equipment. It includes a coaxial graphite tube, liquid metal, insulation material, a water-cooled coil, a temperature measuring device, and a high-frequency power control module. The coaxial graphite tube consists of an inner and outer graphite tube, forming an annular gap between them. The inner cavity of the inner graphite tube constitutes the blackbody cavity. The liquid metal fills the annular gap, generating eddy current heat under an alternating magnetic field. The insulation material covers the outer graphite tube. The water-cooled coil is wound around the outside of the insulation material. The temperature measuring device is attached to the wall of the coaxial graphite tube. The high-frequency power control module is electrically connected to the water-cooled coil to provide high-frequency current, causing it to generate an alternating magnetic field. This invention achieves high spatial temperature uniformity and long-term operational stability of the blackbody radiation cavity wall at high temperatures without relying on precise coil arrangement or mechanical motion compensation.

This invention relates to a thermometer calibration method, belonging to the field of low-temperature radiation metrology calibration technology. It solves the problems of easy error and low accuracy in existing thermometer calibration techniques. This invention uses a low-temperature blackbody radiation device to calibrate the thermometer, including the following steps: Step S1: Stabilizing the temperature inside the blackbody cavity to the target temperature and isolating the cavity from the external environment; Step S2: Installing the thermometer; Step S3: Setting the calibration temperature point and gradually increasing the temperature inside the blackbody cavity from the lowest calibration temperature to the highest calibration temperature; Step S4: Collecting and recording data; Step S5: Processing and analyzing the data. This invention isolates the blackbody cavity from the external environment, preventing external influences on the temperature inside the cavity and maintaining a stable temperature. This avoids errors during thermometer calibration and improves the accuracy of temperature calibration.