| 单词 | photoelasticity |
| 释义 | photoelasticity An effect in which certain materials exhibit double refraction when subjected to stress. It is used in a technique for detecting strains in transparent materials (e.g. Perspex, celluloid, and glass). When polarized white light is passed through a stressed sample, the birefringence causes coloured patterns to be seen on the viewing screen of a suitable polariscope. If monochromatic polarized light is used, a complex pattern of light and dark fringes is produced |
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