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将外差干涉用于给定光学材料的光弹特性测量领域 ,提出了一种测定光弹性某些参数的新方法 ,并研制了一套气压加载装置用以测量不同应力下的折射率变化情况 ,通过实验给出了应力 折射率关系曲线 ,并对实验结果进行了分析。该方法测试方便 ,装置简单 ,可通过很小应力 (1～ 2个大气压 )获得折射率变化与应力的关系 ,折射率变化的测试精度可达 8 4× 10 - 8。
In the field of measuring the photoelastic properties of a given optical material using heterodyne interference, a new method for measuring some parameters of photoelasticity has been proposed. A barometric pressure loading device has been developed to measure the change of refractive index under different stresses The relationship curves of stress and refractive index are given through experiments and the experimental results are analyzed. The method has the advantages of convenient testing, simple device, and the relationship between the refractive index change and the stress can be obtained by using a very small stress (1 to 2 atm). The test precision of the refractive index change is up to 8 4 × 10 -8.