Measuring principle

When light travels through the polarizer, it becomes circular polarized light. When a stressed sample is placed, there is an optical retardation between the slow axis and fast axis . Thus the outgoing light becomes elliptical polarized light. By rotating the analyzer , the rotating angle of the polarized light which is affected by the presence of internal stress can be detected precisely. By applying the rotating angle to a formula, stress value in the sample will be calculated.

A camera is connected with a computer. Detecting data and images can be stored easily .

Features

1. One-key automatic stress measurement within the whole viewing field ;

2. Equipped with 10X zoom lens to provide high-resolution stress image of small objects 

3. Under high-speed mode , a single measurement can be finished in 15s;

4.  Strong testing results analysis functions :

      3D stress image within viewing field,which visually displays the stress level of each point;

     area stress image ( support selecting any rectangular area or circle area )

zooming with area stress image 

4. When moving the cursor , it will automatically display stress retardation at the point of the cursor ;