This Polariscope adopts automatic Senarmont Method to measure the residual stress in transparent objects. In the previous manual Senarmont method, the observer needs to determine the darkest point by their eyes, thus operation errors can not be prevented. This instrument automatically detects the image luminance, thereby finding the darkest point precisely. By inputting sample photoelastic constant and optical path length in advance, the stress value will be calculated by the computer.
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