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 .
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