Precise lab-use Polariscope glass stress Plane Polariscope

Quantative Polariscope measuring tempered grafeÂ

Application

Polarized light interference is adopted to observe and analyze the internal stress of transparent plastic and glass products .

For transparent glass products , Senarmont method is also used to measure the internal stress precisely.

At the moment , this instrument is widely used for quality control and quality improvement within transparent plastic and glass products .

Detection objects

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

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. industrial glass , such as lenses, solar glass ,automobile glass

5. optical crystals, such as calcium fluoride, etc.

Testing methods

Sensitive Color

When the scale compass is at 0 degree，the entire viewing field is orange . This is called the sensitive color. Put the sample onto the polarizer, the part with stress will be light white or grayish black, different from the background color. The part without stress will be orange, the same as the background color.

2. Senarmont

Internal stress of glass products can be measured precisely under this method . Turn on the power, the entire viewing field is dark brown when the scale compass is at 0°. Put the sample onto the polarizer, focus on the brightest spot in the viewing field .That's where the maximum stress exists. Rotate the scale compass on the analyzer until the brightest point turns dark brown, record the rotation angle of the scale compassl . The stress value will be calculated through a formula .

 Specifications

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Other parameters :

1 .Brightness of light field: ≥120cd/m2

2.polarization degree at any point of the polarizing ‰¥ 99%

3. Polarization field : 200*200mm

4. instrument structure : 1/4 wave plate and full wave plate (wavelength: 565nm) are respectively inserted into the analyzer and the polarizer. And the slow axis of the 1/4 wave plate is 90° to the polarization plane of the polarizer. The slow axis of the full wave plate is 45°to the polarization plane of the polarizer.

5. There is a scale compass on the top of the analyzer (measuring range : 1°- 180°)