偏光镜是一种结构简单，操作方便的宝石鉴定仪器，主要用于检测宝石的光性，还可用于判断宝石的轴性，光性符号及宝石的多色性。是鉴定宝石常用仪器之一。
仪器测试，通常是通过偏光仪来测试它的结构晶体，通过折射仪来测试它的折射率。
Instrument testing, usually by polarizing instrument to test the structure of its crystals, through the refractometer to test its refractive index.
国内外在测试应力方面主要采用偏光仪、X射线应力测试仪、中子衍射应力仪、超声波应力测定仪等现代测试手段。
Now the typical means to measure residual stress are polariscope, X-ray diffraction, neutron diffraction, ultrasonic and so on.
本文提出了采用偏光显微镜和X射线衍射仪联合方法鉴定自行车闸皮中低含量的温石棉、铁石棉及青石棉等三种石棉的方法。
A method of identification for low content chrysotile, crocidolite and amosite in brake rubber of bicycle by the united way of polarized light microscope and X-ray diffraction had been established.
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