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A Dynamic Measuring Method of Two-Dimensional Distribution of Refractive Index

A refractive index distribution and dynamic measurement technology, which is applied in the direction of measuring devices, phase influence characteristic measurement, and material analysis, etc., can solve the problems of cumbersome data processing methods, small measurement range, and refractive index distribution, etc., to achieve a wide range of refractive index, The effect of simple data processing method and simple structure

Active Publication Date: 2018-07-03
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, a variety of refractive index sensors based on special optical fiber devices have been widely used due to their high sensitivity and high measurement accuracy, but their measurement range is small and requires complex manufacturing processes
In addition, both refractometers and fiber optic refractive index sensors can only measure the refractive index of homogeneous materials
However, the measurement object in the actual situation is often non-uniform, and the existing methods are difficult to effectively measure the distribution of its refractive index, especially for the dynamic refractive index distribution of some measurement objects in chemical and physical processes.
It was also proposed a method for dynamic measurement of two-dimensional distribution of refractive index in a large range (Y.Chu, et al. "Full-field refractive index measurement with simultaneous phase-shift interferometry," Optik 125(13), 3307-3310( 2014).), but this method requires a complex optical path structure and cumbersome data processing methods, which brings great inconvenience to practical applications

Method used

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  • A Dynamic Measuring Method of Two-Dimensional Distribution of Refractive Index

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Embodiment

[0028] Embodiment: The optical path of a dynamic measurement method of a two-dimensional distribution of refractive index designed by the present invention is as follows figure 1 As shown, it includes: semiconductor pumped solid-state laser 1, fiber coupler 2, first optical fiber 3, optical fiber beam splitter 4, second optical fiber 5, third optical fiber 6, first collimating lens 7, second collimating lens 8. A first half-wave plate 9, a second half-wave plate 10, a rectangular prism 11, a mirror 12, a dichroic prism 13, an image acquisition device 14, and a sample 15.

[0029] The workflow of the dynamic measurement method for the two-dimensional distribution of the refractive index is as follows:

[0030] Step 1: A beam of horizontally or vertically polarized parallel light is incident from one right-angled side of a right-angled prism, and then undergoes total internal reflection at the interface between the hypotenuse of the prism and the air at an incident angle θ, and ...

specific Embodiment

[0048] The linearly polarized light emitted by the semiconductor pumped solid-state laser 1 (wavelength is 532nm) is coupled into the first optical fiber 3 through the fiber coupler 2, and the optical fiber beam splitter 4 is arranged at the end of the first optical fiber 3, which can split the light beam into the first light beam and the second light beam; wherein the first light beam becomes the parallel light of horizontal polarization after the first collimating lens 7, the first half-wave plate 9, and it enters the rectangular prism 11 (K9 glass, n as the object light wave with 45°) 1 =1.5195) and total internal reflection (θ=72.7332°) takes place at the center of its hypotenuse surface, then it is reflected by reflector 12 and reaches dichroic prism 13, and the hypotenuse surface of rectangular prism 11 goes up along the horizontal direction and It is adjusted to a certain height to ensure that the outgoing beam is coaxial with the incident beam; the second beam passes th...

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Abstract

The invention relates to a refractive index two-dimensional distribution dynamic measurement method, which combines a digital holographic interferometry and total internal reflection. Phase shift magnitude of reflected light in a total internal reflection process is relative to an incident angle of the incident light and refractive index of mediums at two sides of a total internal reflection prism interface, a double-exposure digital holographic interferometry is used for dynamic measurement of a phase shift difference value of reflected light before and after a sample to-be-detected is placed on a total internal reflection hypotenuse surface, and the two-dimensional refractive index dynamic distribution of the sample can be calculated directly according to a relation of the reflected light phase shift difference value and the refractive index of air and the sample. The method is characterized in that the refractive index of the sample can ensure that incident light generates total internal reflection in the total internal reflection prism interface, so that large scope refractive index distribution measurement can be realized.

Description

technical field [0001] The invention relates to a dynamic measurement method for two-dimensional distribution of refractive index, in particular to a method for dynamically measuring two-dimensional distribution of refractive index by using the phase shift characteristic of reflected light during total internal reflection combined with digital holographic interferometry. Background technique [0002] Refractive index is an important optical parameter, and its accurate measurement is very important in the fields of material analysis, biochemical sensing, and optical component parameter design. At present, the methods used to measure the refractive index include the natural collimation method, the minimum deflection angle method, etc., and these methods are all based on the laws of refraction and reflection. The traditional instrument for measuring the refractive index is the refractometer, but it needs to be calibrated in advance. In recent years, a variety of refractive ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/45
CPCG01N21/453
Inventor 赵建林张继巍邸江磊席特立马超杰李颖
Owner NORTHWESTERN POLYTECHNICAL UNIV
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