Absolute Responsivity Calibration Device and Method for Infrared Detector Based on Laser Scanning
An infrared detector and laser scanning technology, which is applied in the fields of remote sensing science and optical radiation measurement, can solve the problems of difficult to ensure high uniformity of temperature distribution and large measurement uncertainty, so as to reduce the error link, improve the accuracy level, and improve the stability. The effect of standard accuracy
Active Publication Date: 2020-04-14
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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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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[0028] Such as Figure 4 As shown, an infrared detector absolute responsivity calibration device based on laser scanning includes a tunable laser 1, a laser wavelength meter 2, a laser power stabilizer 3, a chopper 4, and a gold-plated integrating sphere 5 , the irradiance standard detector 6, the radiance standard detector 20 and the measured detector 7, the adjustable laser light emitted by the tunable laser 1 is incident to the beam splitter 8, and the reflected part is incident into the laser wavelength meter 1 2 , the transmission part is incident into the chopper-4 after being controlled by the polarizing prism 9 and the laser power stabilizer-3 in sequence, and the AC signal modulated by the chopper-4 is incident into the gold-plated integrating sphere 5, and the gold-plated integrating sphere 5 is more After secondary reflection and decoherence, a uniform and stable monochromatic irradiance and radiance light source are formed at the exit position of the integrating sp...
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The invention discloses an infrared detector absolute responsivity calibration device and method based on laser scanning, including absolute spectral power responsivity, absolute spectral irradiance (radiance) responsivity, and the absolute spectral power responsivity device can realize The absolute power responsivity of the standard transfer detector is calibrated. By designing the aperture geometry and radiation calibration method of the irradiance standard detector and the radiance standard detector, the function of absolute measurement of irradiance (radiance) is realized, and an absolute The spectral irradiance (radiance) responsivity calibration device transmits the absolute value of the standard transfer detector traced back to the low-temperature absolute radiometer to the user sensor, and conducts ultra-fine spectral scanning on the user sensor in the medium and long-wave infrared to obtain The absolute spectral irradiance (radiance) responsivity makes the calibration accuracy of the user sensor better than 2%, which will play a key role in improving the quantitative inversion level of infrared optical remote sensors.
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...
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IPC IPC(8): G01J5/00G01J5/06
CPCG01J5/00G01J5/06G01J5/48G01J5/80
Inventor 李健军郑小兵谢臣瑜孟凡刚戚涛庞伟伟夏茂鹏闫静
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI