封闭玻璃管道内液体折射率的非接触测量

张宗权; 徐铭; 任俊鹏; 姚志; 苗润才

doi:10.3788/OPE.20162410.2408

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封闭玻璃管道内液体折射率的非接触测量

现代应用光学 | 更新时间：2020-07-07

- 封闭玻璃管道内液体折射率的非接触测量
- Non-contact measurement for liquid refractive index in a closed pipe
- 光学精密工程 2016年24卷第10期页码：2408-2416
- 作者机构：
  
  1.陕西师范大学基础实验教学中心, 陕西西安 710062
  2.陕西师范大学物理学与信息技术学院, 陕西西安 710062
  3.西安航空学院理学院, 陕西西安 710077
- 作者简介：
  
  张宗权(1959-),男,陕西凤翔人,高级工程师,1982年于陕西师范大学获得学士学位,主要从事图像信息处理、光电检测与光学仪器设计等方面的研究。E-mail:zzq@snnu.edu.cn
  [ "徐铭(1991-),男,陕西西安人,硕士研究生,主要从事光学测量和图像处理方面的研究。E-mail:xuming@snnu.edu.cn" ]
- 基金信息：
  
  中央高校基本科研业务费专项资金资助项目(No.GK261001069)
- DOI：10.3788/OPE.20162410.2408
  中图分类号： O661;TP216.1
- 收稿日期：2016-06-24，
  
  录用日期：2016-7-15，
  
  纸质出版日期：2016-10
- 稿件说明：
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张宗权, 徐铭, 任俊鹏, 等. 封闭玻璃管道内液体折射率的非接触测量[J]. 光学精密工程, 2016,24(10):2408-2416.

Zong-quan ZHANG, Ming XU, Jun-peng REN, et al. Non-contact measurement for liquid refractive index in a closed pipe[J]. Optics and precision engineering, 2016, 24(10): 2408-2416.
张宗权, 徐铭, 任俊鹏, 等. 封闭玻璃管道内液体折射率的非接触测量[J]. 光学精密工程, 2016,24(10):2408-2416. DOI： 10.3788/OPE.20162410.2408.

Zong-quan ZHANG, Ming XU, Jun-peng REN, et al. Non-contact measurement for liquid refractive index in a closed pipe[J]. Optics and precision engineering, 2016, 24(10): 2408-2416. DOI： 10.3788/OPE.20162410.2408.

摘要

为了实时、原位和非接触测量工业生产过程中封闭管道系统内透明、半透明液体折射率，提出了一种简单的基于玻璃管壁光学特性的液体折射率测量方法。该方法通过涂覆在玻璃管壁外表面上的透射散射层，将入射激光束转换为进入玻璃管壁的大角度分布的透射散射光；透射散射光到达玻璃管壁与液体的界面上后，符合全反射条件的散射光反射到透射散射层上，自动形成与玻璃管内液体折射率值相关的椭圆形暗斑图像。根据椭圆形暗斑长轴长度与液体折射率之间的解析关系，即可实现玻璃管内液体折射率的原位、非接触测量。对几种常见的透明、半透明液体的折射率进行了实验测量，结果表明：该测量方法的准确性与目前商用数字阿贝折射仪相当（±2×10

-4

RIU）。该测量方法具有成本低、稳定性好、抗干扰且光源稳定等优点，而且在处理与液体折射率相关的光学图像时无需调试，光照即显，有望用于封闭管道在非常温、非常压状态下液体折射率的实时、自动和非接触在线监测。

Abstract

To measure the Refractive Index (RI) of transparent liquid and translucence liquid in industrial process in real-time

in situ and non-contact

a simple method for measuring liquid RI was proposed based on the optical property of glass pipe wall is presented in this paper. By coating a transmission-scattering layer on the outer wall surface of a glass pipe

the incident laser beam was transformed into a wide-angle distributed transmitted scattering light in the glass wall. After the scattered light reached the interface between the pipe wall and the liquid

the scattered light satisfying the condition of total internal reflection was reflected to the transmission-scattering layer to form automatically an oval dark pattern related to the RI of the liquid in the pipe. The method to measure the RI of the liquid in the glass pipe in situ and non-contact could be implemented according to the analytic relation between the long axis length of the oval dark pattern and the liquid RI in the glass pipe. Several RIs of transparent liquid and translucency liquid were measured. The experimental results show that the accuracy of this apparatus is the same as that of an Abbe refractometer(±2×10

-4

RIU(refractive index unit)). It concludes that the method is characterized by simple configuration

lower cost

anti-interference and higher robustness. It is suitable for the optical images relative to liquid refractive indexes

and is expected to monitor the liquid RIs of a closed pipe at an abnormal temperature and an abnormal pressure in real-time

in situ and non-contact.

关键词

Keywords

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