Linear double-refraction measuring device and method for glass material

Abstract

The invention discloses a linear double-refraction measuring device and a linear double-refraction measuring method for a glass material. The device comprises a light source module and a measuring module; the measuring module comprises a four-quadrant detector, a focusing objective lens and an image sensor which are arranged sequentially; the four-quadrant detector comprises four light channels; and line polaroids with the polarization directions of 0 degree, 45 degrees, 90 degrees and 135 degrees are arranged on the four light channels correspondingly. Linear double-refraction measurement ofthe glass material does not relate to rotation and mechanical motion of a polarizing device, and the polarization information is the polarization information of to-be-detected light at the same time,so error caused by fluctuation of the light source and the mechanical rotation of the polarizing device can be overcome and the measuring accuracy is improved.

Description

Technical field [0001] The invention relates to the technical field of optical glass detection, in particular to a linear birefringence measuring device and method for glass materials. Background technique [0002] In the process of glass production and use, various reasons will cause the birefringence of glass materials: structural stress such as stripes, nodules, and bubbles caused by the inhomogeneity of glass chemical components; temperature gradients that are inevitable during the annealing process The residual thermal stress and the mechanical stress generated inside the glass due to the extrusion of external force during use. This effect produces a slight refractive index difference between the stress axis and the orthogonal axis in the glass, which in turn causes the polarization components of the linearly polarized light transmitted in the glass to have different transmission speeds on the two axes, and long-distance transmission of polarized light It will depolarize to...

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a linear birefringence measurement device and method for glass materials, thereby overcoming the problem that the birefringence measurement method in the prior art is easily caused by the fluctuation of the light source and the mechanical rotation of the polarizing device. to error, resulting in inaccurate measurement

Images