This Polariscope adopts automatic Senarmont method to measure the internal stress in transparent objects. In the previous manual Senarmont method, the observer needs to determine the relatively brighter part and relatively darker part by their eyes, thus operation errors can not be prevented.
This device automatically detects the image luminance, thereby finding the relatively darker part precisely. By inputting sample photoelastic constant and thickness in advance, the stress value will be calculated by the computer. In addition, Sensitive Color method is used to clearly define the direction of stress.