Calibration method of response ratio parameter of infrared detector

Abstract

The invention discloses a calibration method of absolute response ratio of an infrared detector and a device thereof. By using the method of combining a blackbody origin and a narrow band pass filter, the absolute response ratio parameter of the detector under an appointed wavelength is acquired. According to the method, the blackbody origin is adopted as a calibration light source, so the stability of the uniformity of spatial output light spots is guaranteed; the placement positions of the detectors does not need to be precisely adjusted during calibration measurement, so the calibration efficiency and the precision of batch detectors are greatly improved; and meanwhile, power parameter of light irradiated onto the surfaces of the detectors is acquired through a theoretical calculation method, so errors in the power measurement of weak light signals are overcome. Through changing the wavelength parameter of the pass filter and the blackbody temperature, the method can be applied to parameter calibration of the detectors at various wavelengths, and the applicability is high.

Description

technical field [0001] The invention relates to a method for calibrating the responsivity parameter of a photoelectric detector, in particular to a method for calibrating the absolute responsivity of an infrared detector. Background technique [0002] Infrared detectors are the core components of laser power / energy density distribution measurement equipment. The number of infrared detectors used in this equipment is as many as hundreds. Accurate measurement of the responsivity parameters of the detectors is a prerequisite for determining the indicators of the measurement equipment. Responsivity refers to the ratio of the signal generated by the detector to the incident optical power of the wavelength at a specified wavelength. To achieve its absolute measurement, it is necessary to accurately measure the optical power of the wavelength incident on the detector and the signal generated by the detector. . [0003] The existing responsivity measurement methods mainly include b...

AI Technical Summary

Problems solved by technology

However, since the light intensity of the above-mentioned light source is very weak, and its power is even weaker after being split by the grating, it is difficult to accurately measure the light power after splitting, and it is also difficult to theoretically calculate the radiation characteristics and grating diffraction parameters of the broadband light source. Therefore, it can only be used for the relative measurement of the responsivity; the laser light source absolute measurement method uses a laser as a light source to measure the absolute responsivity of the detector at this wavelength. laser power

Due to the uneven spatial distribution of the output beam of the laser and the small effective photosensitive surface of the detector, when measuring a large number of detectors, it is necessary to measure the laser power and the response of the detector at the corresponding laser position twice for each detector signal, it is necessary to use a precision optical adjustment frame to precisely adjust the placement position of each detector, which will ultimately affect the efficiency and accuracy of batch measurement; in addition, when measuring the detector responsivity of special wavelengths such as mid-infrared Instable laser output power or high operating costs limit the application of this method

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