Method for measuring refractive index distribution of transparent medium on basis of interference fringe image processing

A technology of refractive index distribution and interference fringes, which is applied in the field of providing a measurement device for realizing the measurement method, can solve the problems of complicated data processing, long measurement time, and inability to measure the refractive index distribution of non-uniform transparent media.

Active Publication Date: 2015-05-06
SICHUAN UNIV
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Problems solved by technology

However, the measurement time is long, the data processing is cumbersome, and only low-frequency interference fringe signals can be processed
Then "Optics Communications" disclosed "A single-element interferometer for measuring refractive index of transparent liquids" (see "Optics Communications" 332 (2014) 14–17, Tao Zhang, etc.), which improved and improved the above method , the measurement results with higher precision are obtained, but this method can only measure the refractive index of transparent media with uniform refractive index distribution, and cannot measure the refractive index distribution of non-uniform transparent media

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  • Method for measuring refractive index distribution of transparent medium on basis of interference fringe image processing
  • Method for measuring refractive index distribution of transparent medium on basis of interference fringe image processing
  • Method for measuring refractive index distribution of transparent medium on basis of interference fringe image processing

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Embodiment 1

[0056] This example is a simulation experiment. The refractive index distribution is measured on a non-uniform transparent medium. The simulated refractive index distribution is n=peaks(256,256) / 10000+1.3316, where the peaks function is a function that comes with matlab, which produces a concave-convex surface. Contains three local maxima and three local minima, set the carrier frequency in the x direction to 1 / 8, and the carrier frequency in the y direction to 0, simulate the interference fringes, and obtain that the sample stage 3 rotates at 0° and The two interference fringe patterns at 18° are as follows image 3 (a) and image 3 As shown in (b), the integer part of the interference fringe movement during the rotation from 0° to 18° is 245, respectively for image 3 The middle interference fringe diagram (a) and the interference fringe diagram (b) use the two-dimensional FFT method to extract the wrapped phase, and then use the conventional diamond unpacking algorithm to ...

Embodiment 2

[0058] In this example, the distribution of the refractive index of the transparent medium is measured based on the interference fringe image processing as follows figure 1Measurements are carried out as shown in the structure diagram of the measuring device. The sample 11 to be tested is a sodium chloride-water solution that is dissolving, and it is placed in a cuvette 2; a micro stepper motor 3-2 and a lifting platform are arranged below the loading table 3-1 in the sample table 3 3-3, driven by the micro-stepping motor 3-2, the loading table surface 3-1 is rotated, and the lifting table 3-3 is used to control the sample 11 to be tested to move up and down on a plane perpendicular to the optical path; the optical matching system 1 adopts A telescope system with a magnification of 10 times to expand the laser beam with a diameter of 2mm and a wavelength of 636.94nm generated by a semiconductor laser into a circular beam with a diameter of about 2cm; the thickness of the sodi...

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Abstract

The invention relates to a method for measuring the refractive index distribution of a transparent medium on the basis of interference fringe image processing, and belongs to the technical field of substance refractive index measurements. The method comprises the following steps: generating an interference fringe image by virtue of the beam splitting surface of a three-dimensional beam splitting prism, and then measuring the refractive index distribution of the transparent medium to be measured by calculating the interference fringe movement number generated by changing the difference between an optical path of an input light transmitting the sample to be measured and an optical path of the input light transmitting a reference medium. The invention also provides a measurement device for realizing the measurement method. The measurement method disclosed by the invention is capable of measuring the refractive index of a uniform transparent medium with higher accuracy, and measuring the refractive index distribution of a non-uniform transparent medium. The measurement method and the measurement device thereof disclosed by the invention further have the advantages of reducing measurement times, shortening measurement time and simplifying data processing on the premise of ensuring measurement accuracy and stability.

Description

technical field [0001] The invention belongs to the technical field of material refractive index measurement, in particular to a method for measuring the refractive index distribution of a transparent medium based on interference fringe image processing, and provides a measuring device for realizing the measurement method. Background technique [0002] As the basic physical quantity that characterizes the properties of matter, the refractive index reflects a lot of information inside the matter. It is often used in engineering fields such as optics, chemistry, new material synthesis, and material identification, as well as in scientific research. The precise measurement of the refractive index is widely used in industrial applications. Significance. [0003] There are many methods for measuring the refractive index of materials, and the automatic and high-precision measurement of the refractive index of materials has always been the goal pursued by researchers. Among the va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/45
Inventor 冯国英兰斌张涛周寿桓
Owner SICHUAN UNIV
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