The Method of Measuring the Refractive Index of Materials by Irradiating the Edge and Bottom of a Double Prism

Abstract

The method of measuring the refractive index of the material by illuminating the edge and bottom surface of the double prism; the laser shell is a cylinder, and the laser can rotate around the central axis; the outgoing light of the two lasers is on a straight line; each scale has a square hole to make the exit of the laser The emitting light point is changed from a circular light point to a square; the double prism is located in the middle of the two lasers; the right laser shines on the edge of the double prism, and the distance between the closest ends of the two reflected light points is S1; turn off the right laser, turn on the left Side laser, rotate the left laser, move the double prism backward, so that the laser of the left laser is perpendicular to the bottom surface of the double prism and irradiates the bottom surface corresponding to the front edge, and the distance between the rear end of the refracted light spot and the rear end of the square hole The distance is S2, that is, the distance between the square hole and the same side of the refracted light spot is S2; the refractive index of the material corresponding to the laser wavelength on the left is n=2S2 / S1. The measurement principle is clear, the measurement method is easy to understand, and the calculation is simple.

Description

technical field [0001] The invention relates to the measurement of the refractive index, especially the measurement of the refractive index of a double prism or a small-angle wedge. Background technique [0002] The measurement of refractive index is mainly based on the law of refraction, and total reflection is often used for measurement; the tools used are usually spectrometer or Abbe refractometer, and the adjustment of spectrometer and Abbe refractometer is more complicated; There are certain requirements for the shape, size and thickness of the material, and it cannot be measured for certain shapes of materials. Therefore, it is necessary to propose an appropriate measurement method based on the specific shape of the transparent material. Contents of the invention [0003] The invention mainly proposes a method for measuring the refractive index for small-angle wedges such as double prisms. [0004] The technical solution adopted by the present invention to realize ...

AI Technical Summary

Problems solved by technology

[0002] The measurement of refractive index is mainly based on the law of refraction, and total reflection is often used for measurement; the tools used are usually spectrometer or Abbe refractometer, and the adjustment of spectrometer and Abbe refractometer is more complicated; There are certain requirements for the shape, size and thickness of the material, and it cannot be measured for certain shapes of materials

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