Design of conjugated reflectometer for reflectance measurement

被引：1
|
作者：
Wu L.-X. [1 ,2 ]
Wang L.-J. [1 ]
Lin X.-W. [1 ]
Liu F. [1 ]
机构：
[1] State Key Laboratory of Laser Interaction with Matter, Northwest Institute of Nuclear Technology
[2] College of Opto-Electric Science and Engineering, National University of Defense Technology
来源：
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | 2010年 / 18卷 / 12期
关键词：
Collection efficiency; Conjugated reflectometer; Coulpling characteristics; Laser radiation; Reflectance measurement;
D O I：
10.3788/OPE.20101812.2521
中图分类号：
学科分类号：
摘要：
A conjugated reflectometer was designed to measure both the total hemispherical reflectance and the specular reflectance of samples in real-time, and it could also be used for temperature-dependent reflectance measurement. The primary component of the conjugated reflectometer is a hemi-ellipsoidal shape shell (axis ratio 10:9:9) with relatively high specular reflectance (>70% in the spectral ranges from visible light to long-wave infrared) on its inner surface. The measuring principle and configuration of the reflectometer were introduced. The main influencing factors of collection efficiency including the position of incident port, incident direction, incident beam diameter, collecting aperture, and the reflection property of interior surface of the hemi-ellipsoidal shell were analyzed and simulated by the ray tracing method qualitatively. Obtained results indicate that a collection efficiency of 97.8% ratio to entire collection can be obtained by the detecting laser beam with a diameter of 10 mm and collecting aperture of 38.1 mm. Furthermore, the higher degree of fineness is required for a shorter wave measurement; and the collection efficiency for certain area is mainly decided by the specular reflectance of inner surface with a perfect shape. It is concluded that the key factor for the accuracy and reliability of measurement is the machining precision of interior surface of hemi-ellipsoidal shell, therefore, the shape accuracy, degree of fineness and the reflectivity of inner surface are all very important.
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页码：2521 / 2529
页数：8
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共 12 条
  • [1] Min G.R., Technology of Satellite Thermal Control, (1991)
  • [2] Zhang Y.Q., Wabg G.B., Tang X.S., Et al., Ablation threshold measurement and absorption characteristic analysis of two fiber reinforced composites irradiated by CW laser, High Power Laser and Particle Beams, 21, 2, pp. 199-202, (2009)
  • [3] Wang G.B., Liu C.L., Absorption characteristics of the composite reinforced by polyarylamide fibers irradiated by high power laser, High Power Laser and Particle Beams, 15, 11, pp. 1065-1067, (2003)
  • [4] Yang B.Y., Zhang L.M., Shen Z.G., Et al., Characteristic measurement of diffuser panel used for on-board calibration for satellite optical sensors, Opt. Precision Eng., 17, 8, pp. 1851-1858, (2009)
  • [5] Bergstrom D., Powell J., Kaplan A., The absorptance of steels to Nd:YLF and Nd:YAG laser light at room temperature, Applied Surface Science, 253, 1, pp. 5017-5028, (2007)
  • [6] Neu J.T., Measurement of hemispherical directional reflectance in the infrared, SPIE, 1995, pp. 101-120, (1993)
  • [7] Bergstrom D., Kaplan A., Powell J., Et al., Laser absorptance measurements in opaque solids, Proc. of 10th Nordic Laser Materials Processing Conference, pp. 91-115, (2005)
  • [8] Andrew L.S., Donald F.S., Et al., Temperature effects on reflectance and emittance measurements of martin black and enhanced martin blacks surfaces, SPIE, 2864, pp. 387-405, (1996)
  • [9] Freeman R.K., Rigby F.A., Doerr S.E., Et al., Reflectance of laser damaged spacecraft thermal control materials, SPIE, 3343, pp. 983-994, (1998)
  • [10] Freeman R.K., Rigby F.A., Temperature-dependent reflectance of plated metals and composite materials under laser irradiation, Journal of Thermophysics and Heat Transfer, 14, 3, pp. 305-312, (2000)
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