Method and device for measuring refractive index of curved optical component based on Brewster's law

A technology of optical components and measuring devices, which is used in the measurement of refractive power, testing optical performance, etc., to achieve generalization, shorten measurement time, and solve dynamic errors.

Active Publication Date: 2019-04-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

[0007] The purpose of the present invention is to solve the limitation problem that the traditional Brewster's law measurement method can only detect the plane medium to be measured, improve the universality and practicality of measurement, and propose a curved surface based on Brewster's law Method for measuring refractive index of optical element, and measuring device

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  • Method and device for measuring refractive index of curved optical component based on Brewster's law
  • Method and device for measuring refractive index of curved optical component based on Brewster's law
  • Method and device for measuring refractive index of curved optical component based on Brewster's law

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Embodiment

[0039] A device for measuring the refractive index of curved optical elements based on Brewster's law, such as figure 1 As shown, it includes a laser 1 , a beam expander 2 , a collimator 3 , a first linear polarizer 4 , a converging lens 5 , a second linear polarizer 6 , an area array detector 8 , and a computing processing system 9 .

[0040] The medium 7 to be measured in this embodiment is a rectangular prism whose material is K9. During the measurement process, the laser 1 uses a He-Ne laser with a center wavelength of 632.8nm, and the spot diameter is 2mm; the beam expander 2 operates at a wavelength of 450-780nm, and the beam expansion rate is 6 times; the first linear polarizer 4, the first line The extinction ratio of the polarizer 6 is 100:1, and the transmittance is greater than 50%. Taking the horizontal direction as a reference, the polarization angle of the first linear polarizer 4 is 60°, and the polarization angle of the second linear polarizer 6 is 0°; the conv...

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Abstract

The invention discloses a method and a device for measuring a refractive index of a curved optical component based on Brewster's law, and belongs to the field of optical precision testing. A concentrated laser beam is used instead of a small-diameter parallel laser beam as incident light. Extended beam laser is focused on the apex of a surface of the medium to be tested. The problem caused by beamdivergence is eliminated with a smaller spot area. Reflected light intensity distribution is obtained by using an area array detector. The DC of light intensity minimum detection is converted to thedarkest position of laser dark spot detection, and accurate quantification for Brewster's angle is realized by using digital image processing, which is insensitive to time-varying stray light and motion errors, thereby solving a precision problem caused by motion. At the same time, the time for a single measurement is shortened, thereby achieving accurate measurement for refractive index parameters of the curved optical component. Compared with a traditional Brewster's angle measuring device, the device of the invention has a simpler structure, and device costs and measuring time are reduced while effectively improving the measuring precision.

Description

technical field [0001] The invention relates to a method and a measuring device for measuring the refractive index of a curved surface optical element, in particular to a method and a measuring device for measuring the refractive index of a curved surface optical element based on Brewster's law, and belongs to the technical field of optical precision testing. Background technique [0002] The optical refractive index of a medium is a physical quantity used to describe the degree of deceleration of the speed of light in a medium relative to that in a vacuum. For an optical system, the refractive index of its optical components directly affects the performance of the optical system. With the development of modern science and technology, the performance requirements of optical systems are increasing day by day. Therefore, the accurate measurement of the optical refractive index of optical components is also very important. [0003] Using the Brewster's angle method to measure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
CPCG01M11/0228
Inventor 胡摇吕佳航郝群
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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