Multispectral uniform surface light source

Abstract

The invention relates to a multispectral uniform surface light source for generating a multispectral uniform light-emitting surface and suitable for detecting the image surface uniformity and the spectral response of photoelectronic imaging equipment, i.e. a camera and the like, belonging to the technical field of optical precision measurement. The multispectral uniform surface light source comprises a shell, a light source controller, a light source driver, a light balancing system and a multispectral light-emitting diode (LED) array, wherein the light source controller and the light source driver are fixed in the shell; the light balancing system is fixed on a light-emitting opening of the shell; the multispectral LED array is fixed in the shell, and multispectral light rays emitted by the multispectral LED array are emitted out of the light-emitting opening of the shell after penetrating through the light balancing system; a light balancing plate scatters the light rays emitted by the multispectral LED array to generate a multispectral uniform lambert surface, and the illumination of the lambert surface can be regulated. The light source has high brightness and small volume and can realize the spectral turning flashing and the multispectral colour mixing and meet the requirements of the fast detection and calibration of the image surface uniformity and the dynamic spectral response of a photoelectronic imaging system.

Description

technical field [0001] The invention belongs to the technical field of optical imaging testing, can be used to generate a multi-spectrum uniform light-emitting surface, and is mainly applicable to the image surface uniformity and spectral response detection of photoelectric imaging equipment such as cameras. technical background [0002] The optoelectronic imaging system in the field of aerospace science and technology industry has developed rapidly, and many new imaging satellite platforms have added high-performance optoelectronic imaging systems. As the "eyes" of satellites, optoelectronic equipment has become an important payload on satellites, mainly used to realize the functions of observation and mapping of ground targets. [0003] The core component in the photoelectric imaging system - high-precision CCD image sensor is composed of discrete photosensitive picture elements. Although the geometrical precision of modern sensors is very high, the responsivity of each p...

AI Technical Summary

Problems solved by technology

Patent 200810104199.7 uses a diffuser plate and a curved reflector to form a surface light source, which has good stability, safety and reliability, but the processing of the curved reflector is complicated, and the thickness of the surface light source is relatively large

Another type of LED surface light source does not require light guide plates or reflectors due to the use of LED array lighting. For example, patent CN201057435Y uses an adjustable constant current source to drive the LED array to provide a uniform surface light source with small size, high uniformity, and low heat dissipation. However, the device does not have multi-spectral characteristics and cannot realize multiple spectral responsivity detection

In the patent CN2852594Y, multiple colors of LEDs are used to form an LED array, providing a surface light source with variable color tone, but the PWM driving method used will cause the LED array to produce high-frequency flicker, which cannot be detected by human eyes , but it will cause the instability of the photo brightness of the camera under test, which will affect the measurement accuracy of the camera

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