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Testing principle and application field of glass surface stress meter

  • Source: Unknown
  • Date: April 28, 2020
  • Number of views: two hundred and eight
Glass surface stress meter The principle of the measurement is to use the optical waveguide effect of the ion exchange layer on the glass surface for measurement. The diverging light from the light source passes through the slit, converges by the high refractive index cylindrical prism and becomes a parallel light. By adjusting the position of the light source, a beam of parallel light can be incident to the interface between the glass and the prism at a critical angle. Due to the stress on the glass surface, the light is decomposed into vector light with two vibration surfaces perpendicular to each other, These two beams of light propagate at different speeds in the ion exchange layer of the glass, so they are refracted to the prism at different total reflection angles. The light emitted from the prism is reflected by the reflector into the interference filter, focused by the telescope system, and then imaged on the reticle after passing through the analyzer to form a light and dark step image. The analysis software can accurately measure the height of steps and the number of step lines to calculate the surface stress intensity and the depth of stress layer.
       
Due to uneven cooling or other reasons such as mechanical action, the internal stress of transparent objects will produce, causing birefringence. The crystal material itself has the optical characteristics of birefringence.
        
The surface stress meter adopts the principle of polarization photoelectric vector synthesis and optical compensation, and determines the size of the stress birefringence of the sample through the quantitative measurement of the optical path difference of the sample. It can accurately measure the optical path difference of optical wave plate and determine the stress level of optical glass. It is an indispensable instrument in optical instrument manufacturing industry and an important tool for studying crystal minerals. Widely used in optical glass, glass products, transparent plastic products industry.
 
The surface stress instrument is used to check the size and distribution of stress in transparent objects. It is not only widely used in optical glass, optical instruments, glass products, plastic products and other industries, but also plays an important role in the inspection of safety explosion-proof indicators of building materials, lamps, pharmaceuticals, beverages, handicrafts, and also has many applications in the fields of crystal jewelry production, geology and minerals, and materials science. At the same time, the surface stress instrument provided by Dongyi Seiko is also an ideal teaching experimental equipment for colleges and universities.
 
 

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