Low light intensity calibration device

Abstract

The invention discloses a low light intensity calibration device. The device comprises an integrating sphere source, a diaphragm, an optical alignment system, a detection system and a computer, wherein the integrating sphere source includes a variable incident diaphragm and an emergent diaphragm; the optical alignment system includes a plane mirror, an off-axis parabolic mirror and a one-dimensional motorized translation stage; the detection system includes a standard low light detector, a calibrated instrument and a one-dimensional motorized translation stage; the computer is installed with a measurement software packet; the variable incident diaphragm and the emergent diaphragm of the integrating sphere source are automatically adjusted by controlling a step motor via the computer, to realize intensity adjustment within a large dynamic range of 10<-3>1x-10<-9>1x; and the plane mirror for reflecting a light path in the optical alignment system can be controlled by the computer to shift in and out of the light path via the one-dimensional motorized translation stage, to realize switching between double light paths and meet the view field requirements of different calibrated instruments. The low light intensity calibration device solves the problem of accurate calibration of low light measurement instruments such as low light illuminometers and calibrated star sensors, and has the characteristics of high measurement accuracy, large dynamic range, good repeatability and wide application prospect.

Description

technical field [0001] The invention belongs to the field of optical metrology and testing, and relates to a low-light photometric calibration device, in particular to a low-light photometric calibration device with a large dynamic range based on an integrating sphere light source with adjustable illuminance. Background technique [0002] With the development of science and technology, star sensors are widely used in high-precision attitude determination, space navigation and positioning of satellites, spacecraft, space shuttles and space stations. The use of star sensors for star-light inertial compound guidance improves the anti-jamming capability and effectively improves the system's hit accuracy. The aviation starlight navigation system proposes that the star sensor be in (10 -3 ~10 -9 )1x range of weak light illumination calibration requirements, the "Chang'e" lunar exploration project proposed the starlight simulator in the aircraft (illuminance less than 10 -5 lx) ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that weak light measuring instruments cannot be calibrated accurately in the prior art, the present invention provides a weak light photometric calibration device. Specifically, the calibration device is based on an integrating sphere light source with adjustable illuminance, combined with dual optical path switching technology and Weak light detection technology, through comparison with standard weak light detectors, to achieve accurate calibration of weak light measuring instruments (such as weak light meter, star sensor, etc.)

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