6 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.

The invention discloses an ultrahigh-temperature blackbody cavity radiation source self-adaptive closed-loop temperature control method and system, and belongs to the field of radiation temperature control, and the method comprises the following steps: S1, collecting a multi-source observation signal of a blackbody cavity in real time, carrying out the time domain alignment processing of the multi-source observation signal to eliminate the dynamic response lag, and carrying out the time domain alignment processing of the multi-source observation signal; performing frequency domain decomposition to separate out a high-frequency component for temperature tracking and a low-frequency component for emissivity identification; s2, constructing a state space observation model, and operating a nonlinear state estimation algorithm based on the state space observation model to update a temperature estimation value and an effective emissivity estimation value; and S3, performing compensation calculation on the target radiation exitance based on the effective emissivity identified in real time, generating a compensation temperature, generating a final heating power instruction, identifying a fault type according to a time-varying feature of an effective emissivity estimation value, and triggering a corresponding maintenance instruction, thereby improving the accuracy of adaptive precise temperature control of the ultra-high temperature black body cavity radiation source.

The utility model discloses a bionic device for thermal imaging type screening instrument mobile calibration, which relates to the technical field of thermal imaging type screening instrument calibration and comprises a mobile cart and a bionic human head, a black body radiation source with effective emissivity of 0.98 is arranged in the bionic human head, a black body cavity of the black body radiation source is positioned at the center of the forehead of the bionic human head, and the black body cavity of the black body radiation source is positioned at the center of the forehead of the bionic human head. A first heating coil and a second heating coil are wound on the outer side of the black body cavity; according to the utility model, the black-body radiation source is embedded into the bionic human head, so that the black-body radiation source can be used for body temperature mode error calibration under the condition of face recognition of the screening instrument, the black-body radiation source is provided with the uninterruptible power supply, and when screening instruments at different positions are calibrated, the blackbody radiation source is prevented from being powered off due to position movement, and the calibration accuracy is improved. The waiting time required for restarting and stabilizing the blackbody radiation source is avoided, and the working efficiency of field calibration is improved. The device disclosed by the utility model is placed on a movable trolley, so that field calibration movement is facilitated, and the labor intensity of calibration personnel is reduced.

The utility model relates to a light shield for stray light on the side wall of a deep-cavity black body, and belongs to the field of black body light shields. The light shield comprises a light shielding part which is installed right in front of a black body radiation surface and is provided with a circular through hole, and a light extinction structure is arranged in the circular through hole; the auxiliary heat dissipation part is located at the edge of one end of the shading part away from the blackbody radiation surface; wherein a first gap is formed between the shading part and the black body radiating surface, and a second gap is formed between the outer wall of the shading part and the inner side wall of the black body cavity. According to the light shield for stray light on the side wall of the black body of the deep cavity, the light shield part is arranged in the black body cavity, and the light shield part is not in contact with the radiating surface of the black body and the inner side wall of the black body cavity, so that the influence of stray light on the inner side wall of the black body cavity on a test can be effectively eliminated; and the influence caused by reflection heat can be inhibited.

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.