Residual stress measurement of optical glass based on liquid crystal device phase compensation

WANG Haili; YAO Hai; QI Wenhao; LI Xiang; LI Yeqiu; WU Rina

doi:10.37188/CJLCD.2026-0104

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Residual stress measurement of optical glass based on liquid crystal device phase compensation

Device Physics and Device Preparation | 更新时间：2026-09-12

- Residual stress measurement of optical glass based on liquid crystal device phase compensation
- Chinese Journal of Liquid Crystals and Displays Vol. 41, Issue 7, Pages: 962-969(2026)
- 作者机构：
  
  沈阳理工大学理学院，辽宁沈阳 110159
- 作者简介：
- 基金信息：
  
  Scientific Research Project of the Education Department of Liaoning Province(LJ212410144010;LJ212510144036);Optical Selection Research Team Development Project of Shenyang Ligong University
- DOI：10.37188/CJLCD.2026-0104
  CLC： O753.2
- CSTR：32172.14.CJLCD.2026-0104
- Received：08 June 2026，
  
  Revised：2026-06-18，
  
  Published：06 July 2026
- 稿件说明：
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WANG Haili, YAO Hai, QI Wenhao, et al. Residual stress measurement of optical glass based on liquid crystal device phase compensation[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(7): 962-969.
DOI：

WANG Haili, YAO Hai, QI Wenhao, et al. Residual stress measurement of optical glass based on liquid crystal device phase compensation[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(7): 962-969. DOI： 10.37188/CJLCD.2026-0104. CSTR： 32172.14.CJLCD.2026-0104.

摘要

光学玻璃中的残余应力会引起应力诱导双折射效应，导致偏振光产生相位延迟，该相位延迟是实现残余应力定量表征的重要参数。针对传统偏振相位反演方法在较大相位延迟范围内存在相位判定不稳定的问题，提出了一种基于液晶器件相位补偿的光学玻璃残余应力偏振成像测量方法。在偏振光路中引入液晶器件，通过驱动电压连续调节补偿相位，实现液晶补偿量与待测玻璃相位延迟的匹配；以成像灰度与背景灰度差值作为评价指标，通过最小灰度差值确定最佳补偿状态，从而获得光学玻璃相位延迟，并结合应力光学关系实现残余应力反演。实验结果表明，当驱动电压为3.8 V时系统达到最佳补偿状态，对应残余应力为36.235 nm/cm，与标准偏振相位反演方法测得的34.128 nm/cm相比，相对偏差为6.17%，两者结果具有较好一致性，验证了所提方法的有效性。

Abstract

Residual stress in optical glass induces stress-induced birefringence， resulting in phase retardation of polarized light. The phase retardation is an important parameter for quantitative residual stress characterization. To address the instability of phase determination in conventional polarization phase retrieval methods over a large phase retardation range， a polarization imaging measurement method for optical glass residual stress based on liquid crystal device phase compensation is proposed. A liquid crystal device is introduced into the polarization optical path， and the compensation phase is continuously adjusted by the driving voltage to achieve phase matching between the liquid crystal compensation and the phase retardation of the tested optical glass. The difference between the image grayscale and the background grayscale is used as the evaluation metric， and the optimal compensation state is determined by minimizing the grayscale difference， thereby the phase retardation of the optical glass is obtained. The residual stress is then determined based on the stress-optic law. Experimental results show that the optimal compensation state is achieved at a driving voltage of 3.8 V， corresponding to a residual stress of 36.235 nm/cm. Compared with the result obtained using the standard polarization phase retrieval method （34.128 nm/cm）， the proposed method exhibits a relative deviation of 6.17%， indicating good consistency between the two results and validating the effectiveness of the proposed method.

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references

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