Handheld glass stress meter model: SWZY-150
First, use:
The glass product stress inspection instrument is an instrument for inspecting the internal stress of the glass by using the principle of polarization interference. Due to the use of sensitive color chips, the instrument can be qualitatively measured according to the interference color sequence in the polarization field, and the internal stress of the glass. The instrument is suitable for glass factories and glass products factories to check the residual stress of glass products or crystals. It is simple and compact. Lightweight and other features.
Second, the main technical parameters:
1. Polarizing plate through light diameter: 15O mm
2. Spectacle lens polarizer size: 48 mm
Third, the detection principle:
When a birefringent material is placed between the orthogonal polarizer and the analyzer, an interference color appears in the field of view, and a certain interference color corresponds to a certain birefringence optical path difference, and the relationship is as shown in the table.
The full-wave plate between the polarizer and the analyzer is a sheet made of a polymer material, and its birefringence optical path difference & is 565 nm. It is known from the table that the interference color in the field of view is purple-red.
If a test piece is added between the crossed polarizers except for the full wave plate, the combined optical path difference of the two will be greater than or less than 565 nm, and the interference color will change accordingly, and the combined light is obtained according to the interference color chart. The value of the path difference.
Stressed glass specimens are also birefringent materials. Putting such specimens into the stress inspection optical path will also cause changes in the interference color, just as the above-mentioned additional specimens are placed in the optical path, just because of the glass test. The stress of the part is not evenly distributed, so the birefringence optical path difference of each point of the test piece is also different, and the interference color change of each point in the field of view is also different.
Four: Measurement method:
The test piece is placed in the interference field of view, the surface of the whole test piece is observed through the analyzer, and the stress of the glass test piece (the annealing quality of the glass test piece) is qualitatively determined according to the interference color, such as the color of the test piece is basically unchanged or only slightly changed. (from purple to purple), indicating that the annealing quality is good; if the thousands of color changes in some parts of the test piece are large (for example, green or yellow), the annealing quality is poor.
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