Spectrum programmable light source system applied to hyper-spectrum calibration

Abstract

The invention discloses a spectrum programmable light source system applied to hyper-spectrum calibration. The spectrum programmable light source system applied to hyper-spectrum calibration comprises a light source. An optical filter, a collimation system, a cylindrical lens coupled system, a slit, a collimation objective and a dispersion element are sequentially placed on a light path in front of the light source, an imaging system and a digital micromirror device are sequentially arranged on a light path in front of the dispersion element, a light collection lens and an optical fiber coupler are arranged on a light path of useful light modulated by the digital micromirror device, wherein the optical fiber coupler is connected with a integrating sphere, a light splitting radiometer is arranged on the integrating sphere, and feedback control is conducted and target spectrums are simulated through a spectrum simulation program and monitoring the light splitting radiometer. A focusing system and a garbage light collector are sequentially arranged on a light path of garbage light modulated by the digital micromirror device, and the garbage light is eliminated. The spectrum programmable light source system applied to hyper-spectrum calibration can simulate accurately the target spectrums and reduce the effect of inconsistence of calibration light source spectrums and the target spectrums to a calibration result. The spectrum programmable light source system applied to hyper-spectrum calibration accurately measures radiation quantity, and is favorable to improving optical radiation calibration accuracy of a sensor.

Description

technical field [0001] The invention belongs to a calibration instrument in the field of optical radiation calibration, and is specifically used as a calibration light source for hyperspectral remote sensing and biomedical photoelectric detection systems. Background technique [0002] In the field of optical radiation calibration, the light source often used in the calibration of various photoelectric detection equipment is the light source of the integrating sphere. The light source of the integrating sphere generally uses bromine tungsten lamp, xenon lamp, etc. as the luminescent medium. The spectral fine structure of the light source does not match the spectral fine structure of the target observed by the calibration instrument, which affects the calibration accuracy. The target spectrum can be simulated by using an integrating sphere light source based on LED and other luminescent media. However, in hyperspectral applications, limited by the type of LED and the spectral ...

AI Technical Summary

Problems solved by technology

[0002] In the field of optical radiation calibration, the light source often used in the calibration of various photoelectric detection equipment is the light source of the integrating sphere. The light source of the integrating sphere generally uses bromine tungsten lamp, xenon lamp, etc. as the luminescent medium. The spectral fine structure of the light source does not match the spectral fine structure of the target observed by the calibration instrument, which affects the calibration accuracy

The target spectrum can be simulated by using an integrating sphere light source based on LEDs and other luminous media, but in hyperspectral applications, limited by the type of LED and the spectral bandwidth, the fine structure of the simulated target spectrum needs to be improved

[0003] The traditional integrating sphere light source works in a wide-spectrum mode. The radiation measurement of the integrating sphere light source needs to use the light board system for standard transfer. The primary standard is traceable to the standard black body. The standard transfer method has an uncertainty of about 1 On the order of %~5%

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