The Method of Measuring the Refractive Index of Materials by Irradiating the Prism and Bottom of a Double Prism
A technology of double prism and refractive index, which is applied to the measurement of phase influence characteristics, etc., can solve the problems of complex adjustment of spectrometer and Abbe refractive index, and inability to measure, so as to achieve easy-to-understand measurement methods, simple calculations, and clear measurement principles Effect
Inactive Publication Date: 2021-08-03
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 method of measuring the refractive index of the material by illuminating the facet and bottom of the double prism involves the measurement of the refractive index. The thickness of the double prism can be ignored, and the outgoing light of the two lasers is on a straight line; the exit hole of each laser has a scale. The ruler has a square hole aligned with the exit hole of the laser. One end of the square hole is the zero point of the scale; the double prism is located in the middle of the two lasers; The bottom surface of the light does not change the optical path, and the light irradiates the facet, then reflects to the bottom surface, refracts out and irradiates to the left scale to form a refracted light spot. The distance between the rear end of the refracted light spot and the rear end of the square hole is S2; The distance between the light spot and the square hole formed by the light reflected on the facet and the scale on the right is S1, and S1 refers to the distance between the back end of the laser square exit hole and the back end of the reflected light spot; the refractive index n=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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IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 胡再国
Owner SICHUAN UNIV