LED based spectrum distribution adjustable illuminating source system

Abstract

The invention discloses an adjustable illuminant system based on a spectral distribution of an LED, which is characterized in that the invention comprises an integrating sphere, the rear half sphere is near the equator, and pluralities of LED module installation holes are uniformly arranged on the same excircle with the equator, each LED module installation hole is equipped with a LED module, andeach LED module is uniformly equipped with pluralities of LED lights, the rear end of the LED is equipped with a radiator fan, the position of the front end of the LED light is located at the outsideof the LED module installation hole, the integrating sphere is provided with a light opening which is located right ahead of the excircle, every LED light is externally connected with a power controller to control the electric current, and the power controller is controlled by a computer. The spectral distribution is fairly similar to a main spectral distribution needed to be observed, thereby increasing the measuring accuracy.

Description

technical field [0001] The invention belongs to the fields of remote sensing science and spectroscopy, and in particular relates to a light source system with a novel luminescent material as a medium and adjustable spectral distribution. Background technique [0002] Before the optical remote sensor is launched, it must be calibrated in the laboratory. Usually laboratory radiation calibration means that before the launch of the satellite, the entrance pupil of the remote sensor is irradiated with the exit hole of a large uniform integrating sphere light source in the laboratory. The radiance of this spherical light source is adjustable and can cover the remote sensing the dynamic range of the device. By using the standard detector-based calibration method of "multi-band radiance standard detector + integrating sphere (diffuse reflection plate)", the radiance standard detector is used to directly calibrate the optical remote sensor to be calibrated, and the "radiance" to " ...

AI Technical Summary

Problems solved by technology

[0014] Due to the simple operating mechanism, the traditional measurement method mainly manually positions the detector to measure the reflection brightness of the target, and measures the reflection brightness of the reference plate during the measurement process to measure the BRDF characteristics of the relative measurement target. Shortcomings of long length and many influencing factors, and the spectral resolution of the detector is low

[0015] As a calibration light source, the traditional integrating sphere usually uses different standard lamps as the luminescent medium. In the ultraviolet and visible bands, the peak wavelength of commonly used incandescent lamps and halogen tungsten lamps is around 900nm, and their spectral distribution is different from that of the sun. When the remote sensor calibrated under this light source is used to measure objects that use the sun or reflected sunlight as the light source, there are errors in the measurement results, and the brightness of the standard lamp in the visible light band, especially around 400nm, is relatively low, which is very important for visible light. Optical radiation measurements in the band also have an impact

Traditional standard lamps consume a lot of power, have low luminous efficiency, and generate a lot of heat, requiring additional equipment to maintain them

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