Real-time polarization state and phase measurement method based on pixel polarizing film array

A polarizer array, real-time measurement technology, used in measurement devices, measurement optics, optical radiation measurement, etc., can solve the problems of inability to real-time measurement, high vibration isolation, etc., to overcome the inability to measure dynamic objects, reduce the complexity of use, and overcome Effects that require precise position matching and grayscale correction

Active Publication Date: 2014-09-10
UNIV OF SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

[0005] The present invention proposes a real-time polarization state and phase measurement method, the method is mainly based on the pixel polarizer array, and the light intensity, polarization state and phase information of the image can be obtained in real time by collecting a single frame image, so as to solve the problem that the traditional measurement method cannot real-time Measurement and technical problems that require high vibration isolation, can be used for real-time measurement of dynamic objects

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  • Real-time polarization state and phase measurement method based on pixel polarizing film array

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Embodiment 1

[0066] Embodiment 1. Real-time polarization state measurement based on pixel polarizer array

[0067] Figure 5 It is an example of the application of the pixel polarizer array to the measurement of the polarization state. The object to be photographed is a polarizer sample array composed of six square polarizers and a metal disc with a smooth surface, and the background is a rough wall. The materials of the six square polarizers are the same, and the polarizing directions are slightly different. A single image captured by the camera can be divided into four images, namely I(0), I(π / 4), I(π / 2) and I(3π / 4), so that S 0 and DoLP. S 0 Represents what a camera without an integrated pixel polarizer array would look like. DoLP is the degree of linear polarization of the image, which ranges from 0 to 1 (see Figure 5 Medium DoLP color scale), the intensity of the degree of linear polarization is represented by grayscale in the figure, and the higher the grayscale, the higher the...

Embodiment 2

[0068]Embodiment 2. Real-time measurement of phase information of parallel light based on pixel polarizer array

[0069] In this embodiment, to measure the phase of parallel light, the object to be measured is selected as a smooth plane mirror, and its normal is slightly inclined to the incident light. The optical path of this embodiment is as Figure 4 shown, and will not be repeated here.

[0070] Figure 6 It is a schematic diagram of the application of the pixel polarizer array in the embodiment to measure the phase of the plane wave by the phase shift method, Figure 6 The picture (a) is a single-frame interference image collected by a CCD integrated with a pixel polarizer array. The unit pixels of the same transmission polarization direction in the collected pictures are taken out separately, and interpolated and averaged to obtain four pictures with the same resolution. ,Such as Figure 6 Figures (b) to (e) respectively represent the images collected by the CCD when...

Embodiment 3

[0072] Embodiment 3. Real-time measurement of phase information of spherical waves based on pixel polarizer array

[0073] Similarly, the optical path of this embodiment is also as Figure 4 As shown, the difference from the previous embodiments is that the object to be measured in this embodiment is a smooth concave mirror to obtain the spherical wave phase.

[0074] Figure 7 It is a schematic diagram of the application of the pixel polarizer array in the embodiment to measure the phase of the spherical wave by the phase shift method, the Figure 7 The picture (a) is a single-frame interference image collected by a CCD integrated with a pixel polarizer array. The unit pixels of the same transmission polarization direction in the collected image are taken out separately, and interpolated and averaged to obtain four pictures with the same resolution. ,Such as Figure 7 Figures (b) to (e) respectively represent the images collected by the CCD when the transmission polarizati...

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Abstract

The invention discloses a real-time polarization state and real-time phase measurement method based on a pixel polarizing film array. According to the method, the polarizing film array is integrated with a photosensitive element array, each polarizing film unit of the polarizing film array aligns to each photosensitive unit of the photosensitive element array one by one, the polarizing film array is composed of a plurality of equal-sized subarraies, each subarray comprises a plurality of polarizing film units, and transmission polarization directions of different polarizing film units in the same subarray are different. When polarization states are measured, after first three corresponding stokes parameters of light are obtained according to light intensity value which each pixel corresponds to, the linear polarization degree and the linear polarization angle of each pixel of images are calculated, and when phase positions are measured, laser is divided into object light wave and reference light and then modulated to levogyration circularly polarized light and dextrorotation circularly polarized light which penetrate the polarizing film array to be incident to the photosensitive element array. By means of the real-time polarization state and phase measurement method based on the pixel polarizing film array, light intensity, polarization state information and phase information of a dynamic object can be real-timely measured.

Description

technical field [0001] The invention belongs to or relates to the field of polarization state or phase measurement. Specifically, the invention proposes a method for real-time measurement of polarization state and phase, which is mainly based on a polarizer array structure. Background technique [0002] Light is an electromagnetic wave, which contains information such as light intensity, phase, and polarization state (degree of linear polarization, polarization angle). Traditional single-frame photography technology can only record the light intensity information of the object, but not the polarization degree and phase information of the light. In order to obtain the polarization state information of the image, the traditional method is to place a polarizer in front of the lens, rotate the polarizer multiple times and collect the image to calculate the Stokes parameter of the image, thereby obtaining the polarization state information. Since multiple images are collected at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J4/00G01J9/02
Inventor 张青川张志刚程腾伍小平
Owner UNIV OF SCI & TECH OF CHINA
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