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.
Application
Glass Inspection
Plastic Inspection
Crystal Inspection
Optical Fiber Inspection
Detecting method : Sensitive Color + Senarmont
Retardation of full-wave plate : 560nm
Viewing field : 200mm*200mm
Optical retardation range : 0-280nm
Measuring height ( adjustable ) : max 240mm
Overall size : W280*D380*680mm
Voltage: 24VDC( with a AC/DC adaptor )
Light source : White fluorescent lamp
Weight : 15kg
Test Methods:
1.Sensitive Color Method
The background color is aubergine.
After putting a sample on the sample plate, the parts with green ,blue, orange and yellow stripes show the presence of stain. Whether it is compressive strain or tensile strain can be determined easily.
The part without strain has the same color as the background.
2.Senarmont Method
The viewing field is dark-brown .
After putting a sample on the Sample plate, pay attention to the part that is relatively darker in the viewing field . This part has the relatively larger strain . Then rotate the dial until the relatively brighter part can’t get darker.
Greatly improve the measurement accuracy with automatic Senarmont method
Real time display of stress presence
Equipped with a zoom lens for detection of small samples ;
Save data and images automatically with a laptop
Easy to operate , long serving life
Functions
Observe stress presence and stress distribution state
Measure glass temper grade
Measure optical retardation caused by residual stress
