Design of conjugated reflectometer for reflectance measurement

WU Li-xiong; WANG Li-jun; LIN Xin-wei; LIU Feng

doi:10.3788/OPE.20101812.2521

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Design of conjugated reflectometer for reflectance measurement

Article | 更新时间：2020-08-12

- Design of conjugated reflectometer for reflectance measurement
- Optics and Precision Engineering Vol. 18, Issue 12, Pages: 2521-2529(2010)
- 作者机构：
  
  1. 西北核技术研究所激光与物质相互作用国家重点实验室, 陕西西安 710024
  2. 国防科学技术大学光电科学与工程学院, 湖南长沙 410073
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20101812.2521
  CLC： TN247
- Received：10 May 2010，
  
  Revised：23 July 2010，
  
  Published Online：25 December 2010，
  
  Published：25 December 2010
- 稿件说明：
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吴丽雄, 王立君, 林新伟, 刘峰. 用于材料反射率测量的共轭反射计设计与分析[J]. 光学精密工程, 2010,18(12): 2521-2529

WU Li-xiong, WANG Li-jun, LIN Xin-wei, LIU Feng. Design of conjugated reflectometer for reflectance measurement[J]. Editorial Office of Optics and Precision Engineering, 2010,18(12): 2521-2529
吴丽雄, 王立君, 林新伟, 刘峰. 用于材料反射率测量的共轭反射计设计与分析[J]. 光学精密工程, 2010,18(12): 2521-2529 DOI： 10.3788/OPE.20101812.2521.

WU Li-xiong, WANG Li-jun, LIN Xin-wei, LIU Feng. Design of conjugated reflectometer for reflectance measurement[J]. Editorial Office of Optics and Precision Engineering, 2010,18(12): 2521-2529 DOI： 10.3788/OPE.20101812.2521.

摘要

为了研究激光辐照过程中材料的耦合特性及耦合特性随温度的变化规律

设计了一套主体为半椭球壳体

可用于激光辐照过程中材料反射率在线测量的共轭反射计实验装置

研制完成的初样其主体内壁在可见-长波红外光谱范围内镜面反射率优于70% 。介绍了测量原理和测试系统的设计方案

采用光线追迹模拟方法研究了主体部分的设计参数

分析了开孔位置、入射方向、光斑尺寸、收集孔径以及内壁反射特性对测量收集效率的影响。结果表明:在设计指标下选用探测光束直径为

10 mm、收集孔径为

38.1 mm时

收集效率可达到完全收集的97.8%

满足测量要求。另外

用短波激光测量内表面光洁度有更高要求;理想面型条件下

限定范围内的收集效率主要由内壁镜面反射率决定;因此

半椭球内壁的面型、光洁度、反射率及其均匀性是影响测量精度的主要因素。

Abstract

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.

关键词

Keywords

references

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