Method for measuring refractive index of material by irradiating prismatic surface and bottom surface of biprism
A technology of double prism and refractive index, which is applied to the measurement of phase influence characteristics, etc., can solve the problems of inability to measure, spectrometer and complex adjustment of Abbe refractive index, etc., and achieve easy-to-understand measurement methods, simple calculations, and clear measurement principles Effect
Inactive Publication Date: 2020-05-19
SICHUAN UNIV
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[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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[0009] Remarks: Attached Figure 4-8 It belongs to the top view; for the convenience of expression, in the following expressions, according to Figure 4-8 The direction of the description is described in order to understand the drawings, and the description of the real optical path will use another description: for example Figure 4-8 The upper-lower relationship in the horizontal plane is the front-back relationship, so the attached Figure 4-8 The up and down adjustment of the horizontal direction is the same as the front and rear adjustment of the horizontal direction.
[0010] Laser 1 is a commonly used optical component. The support of the laser is fixed on the optical bench. There is a hole in the middle of the support to insert the support shaft. The support shaft can be fixed by fastening screws; the upper end of the support shaft is fixedly connected to a flat plate (called is a fixed plate), the fixed plate is connected to another plate (called a suspended plate) t...
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Abstract
The invention provides a method for measuring the refractive index of a material by irradiating a prismatic surface and a bottom surface of a biprism and relates to the measurement of the refractive index. The thickness of the biprism can be ignored, and emergent light of two lasers is on the same straight line; the emergent hole of each laser is provided with a graduated scale, the graduated scale is provided with a square hole aligned with an emergent hole of the laser, and one end of the square hole is a zero point of the graduated scale; the biprism is positioned right between the two lasers; laser of a left laser device is perpendicular to a bottom surface of the biprism and irradiates to a bottom surface corresponding to a front end edge surface, a light ray do not change in light path, the light ray irradiates to an edge surface, the light ray is reflected to the bottom surface and then refracted to irradiate to a left graduated scale to form a refracted light spot, and the distance between a rear end of the refracted light spot and a rear end of the square hole is S2; the distance between a light spot formed by the light reflected by the prismatic surface to a right graduated scale and the square hole is S1, and S1 is the distance between a rear end of a square emergent hole of the laser and a rear end of a reflected light spot; and the refractive index n is equal to S2 / S1.
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 scheme that the present invention realizes the purpos...
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Login to View More IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 胡再国
Owner SICHUAN UNIV