This device automatically detects the image luminance, thereby finding the darkest point 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.

Features
1.greatly improve the measurement accuracy with the combination of Senarmont, Sensitive Color method and machine vision processing;
2.equipped with a zoom lens for detection of small samples ;
3.measurement can be finished in 10s;
4.save data and images automatically with a laptop

Application
1.measurement of residual stress in various types of glass products ;
2.stress presence and stress distribution in plastic products ;
3.phase difference measurement of optical film ;
4.stress presence in crystalline materials

Instrument parameters
Detecting range :   0-280nm
Magnification 1-24 times
Viewing field max 176×132mm min 6.9×5.2mm
Accuracy about ±1.5nm (scale compass rotation : ± 0.5°)
Dimension W280*D380*680mm
Light source LED
Power supply AC220V

Weight 15kg