Optics and Precision Engineering, Volume. 18, Issue 1, 212(2010)
Development of current stabilized source of standard lamp for spaceborne calibration integrating sphere
The onboard calibration is a basis of a spaceborne Hyper-spectral Imager(HSI) to obtain accurately quantified spectral imaging data. In order to enhance the stability of the tungsten-halogen lamps of the spaceborne calibration integral sphere and to reduce the change of the integral sphere radiance, a kind of current stabilized source for the tungsten-halogen lamps was developed. The operating principle and current stabilized circuit with a soft start characteristic were introduced. And the effects of some performance parameters, inputting voltage load, temperature and so on , on the properties of current stabilized source were analyzed. Then a test was carried out for the current stabilized source. Experimental results show that the current stability can be up to 0.037% by changing the transistor's gain to adjust the time of soft start, collecting the voltage of the high precision resistor and computing the value of the current. Furthermore, the current stability can be up to 0.043% after the repetition. These results also indicate that the accuracy of the current stability can satisfy the requirements that the change of integrating sphere radiance should be less than 1%. The integrating sphere system has been successfully applied to a HSI onboard calibration.
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LI Dong-jing, YU Ping, WANG Xiao-peng. Development of current stabilized source of standard lamp for spaceborne calibration integrating sphere[J]. Optics and Precision Engineering, 2010, 18(1): 212
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Received: Nov. 4, 2008
Accepted: --
Published Online: Aug. 31, 2010
The Author Email: LI Dong-jing (ldj880@tom.com)
CSTR:32186.14.