| 基于扭转向列型液晶的Stokes矢量测量 |
| 郑军, 丁秋时 |
| 清华大学 机械工程系, 先进成形制造教育部重点实验室, 北京 100084 |
| Measurement of the Stokes vector based on a twisted nematic liquid crystal |
| ZHENG Jun, DING Qiushi |
| Key Laboratory of Materials Processing Technology of Ministry of Education, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China |
摘要:
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| 摘要光线的Stokes矢量包含完整的偏振信息, Stokes矢量的测量在偏振成像技术中具有重要意义。传统测量方式一般采用手动旋转偏振片的方法, 测量效率低, 不能实时检测。该文提出了一种基于扭转向列型(TN)液晶的快速测量方法, 用已知偏振光对测量装置标定后, 可以得到TN液晶和固定偏振片组合的Mueller矩阵的第1行参量, 再对TN液晶施加不同的电压, 对入射光线进行测量, 可以得出入射光线的Stokes矢量。采用通过测量入射光入射角的实验方法验证Stokes矢量测量的准确性, 测量入射角10°~70°, 每隔10°测量一次, 得到结果分别为8.54°、18.47°、27.09°、38.93°、47.86°、60.27°、70.89°, 可见该方法最终测量精度与旋转偏振片法相似。 | |||||||||
| 关键词 ：光学测量,偏振,扭曲向列型(TN)液晶,Stokes矢量,偏振度,偏振成像 | |||||||||
| Abstract：The Stokes vector contains complete polarization information. Traditional measurements of the Stokes vector have commonly used a rotating polarizer, but this method cannot be used in real time. This paper presents a fast measurement method based on a twisted nematic (TN) liquid crystal and a polarizer. Light with the known polarization state is used to calibrate the device by calculating the first line of the Mueller matrix for the device. Then, the Stokes vector of the incident light is obtained by applying different voltages to the TN liquid crystal. The method is tested by measuring the incident angle of natural light reflected by a dielectric. The tested incident angles are 10°-70° with every 10° tested once. The results are 8.54°, 18.47°, 27.09°, 38.93°, 47.86°, 60.27°, and 70.89°. Thus, this method has similar accuracy to a rotating polarizer. | |||||||||
| Key words：optical measurementpolarizationtwisted nematic (TN) liquid crystalStokes vectordegree of polarizationpolarization imaging | |||||||||
| 收稿日期: 2015-07-06 出版日期: 2016-02-17 | |||||||||
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| 基金资助:国家 “八六三” 高技术项目(2013AA041003) | |||||||||
| 作者简介: 郑军(1971—), 男(汉), 山西, 副研究员。E-mail: zhengj@mail.tsinghua.edu.cn | |||||||||
| 引用本文: |
| 郑军, 丁秋时. 基于扭转向列型液晶的Stokes矢量测量[J]. 清华大学学报（自然科学版）, 2016, 56(2): 206-210. ZHENG Jun, DING Qiushi. Measurement of the Stokes vector based on a twisted nematic liquid crystal. Journal of Tsinghua University(Science and Technology), 2016, 56(2): 206-210. |
| 链接本文: |
| http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2016.22.010或 http://jst.tsinghuajournals.com/CN/Y2016/V56/I2/206 |
图表:
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| 图1 透明电介质表面反射和折射光矢量示意图 |
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| 图2 自然光偏振态叠加图 |
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| 图3 旋转偏振片法检测原理示意图 |
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| 图4 液晶法检测原理示意图 |
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| 图5 实验系统示意图 |
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| 图6 检测系统实物图 |
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| 图7 采集到的一幅图像 |
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| 图8 测量入射角实际入射角的关系曲线 |
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