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Distorted liquid crystal array-based polarization intensity dual-mode imaging system

A dual-mode imaging, liquid crystal array technology, applied in the direction of measuring the polarization of light, measuring devices, instruments, etc., can solve the problem that non-destructive intensity imaging and polarization imaging cannot coexist, only linear polarization imaging can be achieved, and achieve high cost and work. The effect of wide band and high extinction ratio

Pending Publication Date: 2022-04-29
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention provides a polarization intensity dual-mode imaging system based on a twisted liquid crystal array, which solves the problem that the non-destructive intensity imaging and polarization imaging of the existing focal plane polarization cameras cannot coexist, and can only Realization of linear polarization imaging and other technical issues

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  • Distorted liquid crystal array-based polarization intensity dual-mode imaging system
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  • Distorted liquid crystal array-based polarization intensity dual-mode imaging system

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Embodiment 1

[0060] Embodiment 1: The structure of the four-domain bidirectionally twisted liquid crystal polarization array in this embodiment is specifically as follows figure 2 As shown, it includes a lower quartz substrate 201 , an upper quartz substrate 202 , a lower alignment layer 203 , an upper alignment layer 204 , a liquid crystal layer 205 and a glue frame 206 mixed with spacers.

[0061] Wherein the lower alignment layer 203 and the upper alignment layer 204 are prepared in the lower quartz substrate 201 and the upper quartz substrate 202 respectively. The lower alignment layer 203 can use rubbed alignment materials or photo-controlled alignment materials for uniform alignment; the upper alignment layer 204 can use photo-controlled alignment materials, and according to different design schemes, use digital dynamic micromirror lithography technology or laser direct writing Technology realizes arrayed light-controlled alignment. Their alignment directions can induce the liquid ...

Embodiment 2

[0066] Embodiment 2: Design of a four-domain bidirectionally twisted liquid crystal array that can realize linear polarization imaging in the visible light band, and a device and measurement results for linear polarization measurement using the liquid crystal array and a uniform polarizer. The polarization azimuth modulation or polarization phase modulation of incident light by the twisted liquid crystal structure induced by the arrayed alignment layer. When the parameters of the designed twisted liquid crystal layer 205 meet Morgan's conditions, the twisted liquid crystal array can realize optical rotation modulation of linear polarization on the pixel scale of incident light, thereby realizing linear polarization measurement and imaging.

[0067] image 3 It is the coordinate relationship between the orientation of the upper and lower orientation layers of the bidirectionally twisted liquid crystal array of the present invention and the orientation and twist angle of the pol...

Embodiment 3

[0078] Embodiment 3: A design of a four-domain bidirectionally twisted liquid crystal array capable of realizing full-polarization imaging in the visible light band, and a device and measurement results for full-polarization measurement using the liquid crystal array and a uniform polarizer.

[0079] In this embodiment, four kinds of warping angles are still selected, that is, N=4, as a superpixel.

[0080] Preferably, the orientations of the upper alignment layer 204, the lower alignment layer 203 and the uniform polarizer 104 in this embodiment are as follows Figure 4 As shown: the upper alignment layer 204 uses light-controlled alignment technology to form an arrayed alignment, in which every 4 kinds of twist angles are a super pixel; the uniform polarizer uses iodine-containing polyvinyl alcohol polarizer, and the transmission axis direction is parallel to the upper alignment layer 204 The orientation direction of the polarizer, that is, the azimuth angle (θ) of the polar...

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Abstract

The invention discloses a polarization intensity dual-mode imaging system based on a twisted liquid crystal array, and belongs to the field of polarization imaging and liquid crystal device design. The system mainly comprises a front lens, a micro lens array, a bidirectional twisted array liquid crystal device, a uniform polarizing film, a relay lens and an image sensor focal plane. The bidirectional arrayed twisted liquid crystal polarization device adopts a structure that an arrayed polarization modulation part and an overall intensity modulation part are separated from each other, polarization imaging and intensity imaging without loss of light intensity and resolution can be realized by inserting or cutting out a uniform polaroid, and repeated registration between a polarization array and detector pixels is not needed. Through optimization design of parameters of the bidirectional twisted array liquid crystal layer, linear polarization imaging or full polarization imaging can be achieved, meanwhile, the method has the technical advantages of being low in preparation cost, simple in process, high in extinction ratio, wide in working wave band and the like, and practical application of a focal plane splitting type polarization imaging system is promoted.

Description

technical field [0001] The invention belongs to the field of liquid crystal polarization optical devices, in particular to a polarization intensity dual-mode imaging system based on twisted liquid crystal arrays. Background technique [0002] Polarization is caused by reflection, refraction or scattering at the interface of different substances during the propagation of light. Therefore, the polarization state can provide a lot of information about the interaction between light and matter, making it impossible to accurately identify target variables under traditional intensity imaging systems. clearly visible. By measuring and imaging polarization information, the ability to identify targets in complex backgrounds can be improved, and it has considerable application potential in the fields of environmental monitoring, remote sensing, biomedicine, and military detection. At present, based on the detection requirements of dynamic targets, the polarization imaging system is de...

Claims

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Application Information

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IPC IPC(8): G01J4/00G02B26/00G02B27/28G02F1/133
CPCG01J4/00G02B26/00G02B27/28G02B27/286G02F1/133G01J4/04
Inventor 穆全全张士元孙子珺彭增辉张杏云李大禹王启东鲁兴海宣丽
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI