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.

Objects of Polariscope
float glass plate, automotive glass
crystal , quartz , lens glass
glass container , glass vial , water glass
glass wafer , glass tube , laboratory glassware
resin plate , resin film , mold injection resin products
industrial new material glass , optical new material glass

Measuring principle
The internal stress of glass and plastic products has a birefringent characteristic. In other words, if there is stress inside of these types of products, light from he polarized lamp will be divided into different units, which produces optical interference phenomenon (ripple patterns) in turn.