Method for measuring refractive index of material by irradiating edges and bottom surface of biprism
A technology of double prism and refractive index, which is applied in phase influence characteristic measurement, instruments, teaching models, etc. It can solve problems such as inability to measure, complicated adjustment of spectrometer and Abbe refractive index, etc., and achieve easy-to-understand measurement methods and simple calculations , the effect of clear measurement principle
Inactive Publication Date: 2020-03-27
SICHUAN UNIV
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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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[0020] A method for measuring the refractive index of a material by illuminating the edges and bottom of a double prism, including two lasers 1 and a double prism 2, the double prism 2 includes two isosceles triangular faces and three rectangular faces, the largest rectangular face is the bottom face 3, in addition The two faces are facets 4, the side where the two facets 4 intersect is edge 8, and the isosceles triangle face is called side face 9 (the two isosceles triangle faces are parallel to each other and perpendicular to the three rectangular faces), the isosceles triangle The included angles between the two waists and the base are both α, that is, the included angle between the facet 4 and the bottom 3 is α; α is 0.5-1 o, so the sine value, tangent value and the radian value of the angle are approximately equal, the length of the double prism 2 is 40-60mm, and its thickness is 0.3-1mm, the length of the optical bench is generally more than 1000mm, so the thickness of th...
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Abstract
The present invention relates to a method for measuring the refractive index of a material by irradiating the edges and bottom surface of a biprism. A laser shell is a cylinder, and the lasers can rotate around a central axis, and the emergent light of the two lasers is in a same straight line. Each graduated scale is provided with a square hole, so that an emergent light spot of each laser is changed into a square from a circular light spot. A biprism is positioned right between the two lasers, the right laser irradiates the edge of the biprism, and the distance between the nearest ends of the two reflection light spots is S1. By closing the right side laser, turning on the left laser, rotating the left laser, and moving the biprism backwards, the laser of the left laser is perpendicularto the bottom surface of the biprism and irradiates to the bottom surface corresponding to the front end edge surface, the distance between the rear end of the refraction light spot and the rear end of the square hole is S2, namely the distance between the same sides of the square hole and the refraction light spot is S2, and the refractive index n of the material corresponding to the wavelength of the left laser is equal to 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 ...
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IPC IPC(8): G01N21/41G09B23/22
CPCG01N21/41G09B23/22
Inventor 胡再国
Owner SICHUAN UNIV
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