光谱学与光谱分析 |
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Application of BaSO4 Diffuser Plate in 250-400 nm Spectral Radiance Calibration |
JIA Hui, LI Fu-tian |
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, China |
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Abstract Sprayed BaSO4 diffuser plate is the most Lambertian surface actually used in spectral radiance calibration known by now. Its hemispheric reflectance and Bi-directional Reflectance Distribution Functions(BRDF) were measured in the experiment. Its diffuse characteristics were compared with Lambertian surface. In order to calibrate spectral radiance more accurately, the small variation of diffuser’s BRDF with scattered angles and the nonuniformity of spectral irradiance on diffuser surface illuminated by the standard lamp should be considered. By integrating the radiation flux reflected by the element area and that entering the entrance slit within the viewing area of spectrometer, the measured spectral radiance can be calculated. Further more, the spectral radiance of Lambertian surface whose BRDF was derived from hemispheric reflectance was compared with that from the average of the measured BRDF.
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Received: 2002-11-28
Accepted: 2003-06-16
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Corresponding Authors:
JIA Hui
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Cite this article: |
JIA Hui,LI Fu-tian. Application of BaSO4 Diffuser Plate in 250-400 nm Spectral Radiance Calibration[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2004, 24(01): 4-8.
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http://www.gpxygpfx.com/EN/Y2004/V24/I01/4 |
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