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.
