PTC Computerized Glass Polariscope Stress Magnifier

Computerized  Polariscope (Ref : PSV-702  )

 

This Polarimeter adopts automatic Senarmont to  measure the internal stress in transparent objects . In the previous manual Senarmont method, the observer needs to determine the brightest point and the darkest point by their eyes, thus operation errors can not be prevented .

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

 

Detection objects

1.  lighting industry , such as light bulbs, light tubes

2.  beverage and medical packaging industry, such as drink bottles , Penicillin bottles, ampoule bottles ;

3.  household glassware, such as red wine glass , crisper, salad bowl ;

4.  other glass products , such as contact lenses, solar glass ,automobile glass;

5.  optical crystals, such as calcium fluoride

 

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

 

Composition : polarized stress meter , laptop computer ,  operating system, CCD camera, zoom  lens, cable, operating manual etc

Detecting methods 

Sensitive Color method

( roughly determine the location that has stress )

Senarmont

(Switch to Senarmont. Accurate test is performed  in the parts with stress. In the interface above , the image luminance is 34.4 when the rotation angle on the scale compass is 0°. Manually rotate the scale compass to adjust the  image luminance to the minimum. As  shown in the figure  below, the value is 16.5. A nd the value of analyser  angle is the same as the rotation angle on the scale compass. At this time, the software automatically calculates the stress value 0.12KG/cm² .