Infrared detector absolute responsivity calibration device and method based on laser scanning

Abstract

The invention discloses an infrared detector absolute responsivity calibration device and method based on laser scanning. The device comprises an absolute spectral power responsivity device and an absolute spectral irradiance (radiance) responsivity device. The absolute spectral power responsivity device can calibrate the standard transmission detector absolute power responsivity. By designing theaperture geometry and radiation calibration method of an irradiance standard detector and a radiance standard detector, an absolute measurement of irradiance (radiance) function is achieved. An absolute spectral irradiance (radiance) responsivity calibration device is created to transmit the absolute magnitude of the standard transfer detector traceable to a cryogenic absolute radiometer to ausersensor, and performs ultra-fine spectral scanning of the user sensor in medium and long-wave infrared, obtains absolute spectral irradiance (radiance) responsivity, makes the calibration accuracy ofthe user sensor better than 2%, and plays a key role in improving the quantitative inversion level of the infrared optical remote sensor.

Description

technical field [0001] The invention relates to the technical fields of remote sensing science and optical radiation measurement, in particular to an infrared detector absolute responsivity calibration device and method based on laser scanning. Background technique [0002] The photoelectric remote sensor in the infrared band is one of the main detection methods in the fields of my country's new generation of earth observation missions, the national major science and technology project "high-resolution earth observation system", meteorological and climate forecasting, and astronomical target detection. The quality of its observation data It directly affects the realization of major scientific issues such as global radiant energy balance, temporal and spatial distribution of greenhouse gases, and long-term climate monitoring. [0003] Compared with the visible light-short-wave infrared band, the calibration technology of my country's medium and long-wave infrared band (3μm-5μm...

AI Technical Summary

Problems solved by technology

The biggest uncertainty of this implementation method comes from the measurement of temperature. In actual operation, it is difficult to accurately control and measure the temperature, and it is difficult to ensure a high degree of uniformity in the distribution of the internal temperature of the black body. Therefore, the measurement uncertainty is relatively large. After the standard transmission, The uncertainty of the working standard is 1%-7%. After several standard transfers, the uncertainty actually transferred to the spectroradiometric measuring instrument has reached 5%-15%.

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