| 摘要 |
An apparatus for measuring surface stress of glass coating and transparent plastic product comprises means for projecting the coherent light (1) on the surface (3) of the object (2) to be measured, an output prism (4) having a refractive index greater than that of said surface (3), mounted proximal to the light incident point on said surface (3) in such a manner that one face thereof is in optically close contact with said surface (3), a telescope (5) to measure the critical angle at the interface (3 min ) of said surface (3) and said output prism (4) in respect of the projected light from said output prism (4), and a polarizer (13) located on the optical path of said projected light. The apparatus facilitates easily a direct and non-destructive measurement of the surface stress without any complex calculation.
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