Near-infrared Weak Pulse Spectral Radiance Calibration Device

Abstract

The invention discloses a near infrared weak pulse spectral radiance calibration device which belongs to the technical field of optical metrology. The device comprises a light source component which is used for grating spectrometer calibration, an optical fiber component with an array optical fiber bundle, a computer provided with a spectral radiance calibration data processing software package and a grating spectrometer with a flat field concave surface grating and a surface array EMCCD. The input end of the array optical fiber bundle is a single optical fiber, and the output end comprises n optical fibers in line arrangement. A pulse light beam emitted by a measured pulse light source passes through the optical fiber component and a slit, and is dispersed by the flat field concave surface grating. Dispersed lights are focused onto the photosensitive surface of the surface array EMCCD to form n rows of line spectrum. The computer collects n rows of line spectrum, acquires the spectral radiance value of the measured pulse light source changing with wavelength according to a spectral radiance calculation formula, and shows a single width or multi width spectral radiance curve on a computer screen. The device provided by the invention solves the problem of difficult calibration of the spectral radiance of a near infrared weak pulse light source, and has a broad application prospect.

Description

technical field [0001] The invention belongs to the technical field of optical metrology, and mainly relates to a light source spectral radiance calibration device, in particular to a spectral radiance calibration device for a near-infrared weak pulse light source. Background technique [0002] In recent years, near-infrared pulsed light sources have been widely used in military reconnaissance and guidance and other fields. Near-infrared pulsed light sources include pulsed xenon lamps, semiconductor pulsed lasers, etc., which provide active light for target detection. The reflected light of the target includes the near-infrared band 0.9μm~ The characteristic spectrum of 1.1μm is received and processed by military reconnaissance or guidance equipment to realize target recognition. In order to ensure that reconnaissance and guidance equipment have better anti-reconnaissance capabilities, the radiance of near-infrared pulsed light sources is required to be weaker and weaker, lo...

AI Technical Summary

Problems solved by technology

In this instrument, since the EMCCD detector works under cooling conditions, compared with the spectrometer using an uncooled linear array CCD detector, its spectral test sensitivity is higher; however, the instrument needs to be equipped with a collimating mirror and a focusing mirror and other optical systems, causing unnecessary energy loss

In addition, the instrument can test the relative spectral radiation measurement curve in the range of 0.9 μm to 1.1 μm in the near-infrared band, and there is no report giving the absolute spectral radiance in the near-infrared band

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