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Liquid crystal rotation effect-based non-electrical readout thermal imaging detection method

A thermal imaging and optical effect technology, applied in the field of non-electrical readout infrared thermal imaging, can solve the problems of expensive economic cost, complex technology of electrical readout infrared thermal detector, etc. simple method effect

Inactive Publication Date: 2013-04-24
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a non-electrical readout thermal imaging detection method based on the optical rotation effect of liquid crystals, and its purpose is to overcome the complex technical and expensive economic cost problems of the existing electrical readout infrared thermal detectors

Method used

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  • Liquid crystal rotation effect-based non-electrical readout thermal imaging detection method
  • Liquid crystal rotation effect-based non-electrical readout thermal imaging detection method

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Experimental program
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Effect test

Embodiment 1

[0025] Cholesteric liquid crystals are heated above the clearing point and filled into pre-prepared liquid crystal cells by capillarity. The liquid crystal cell is prepared with two pieces of glass coated with a soluble polyimide-based alignment agent. Use glass fiber to control the thickness to 8mm, reserve two holes on the top and bottom to fill the liquid crystal, and encapsulate the rest with epoxy resin. In order to achieve infrared absorption, the inner side of a piece of glass is coated with an infrared absorbing material, through which visible light can pass. That is, a thermosensitive element containing cholesteric liquid crystal and infrared absorbing material is obtained. according to figure 1 Optical system assembled as shown. Place the side coated with the infrared absorbing material of the above-mentioned heat sensitive element close to the analyzer. A helium-neon laser is used as the visible light source. When the infrared radiation emitted by the object is...

Embodiment 2

[0027] An infrared absorbing material is added to the liquid crystal. Above the clearing point of the liquid crystal, the mixture is filled into the prepared liquid crystal cell by using the capillary phenomenon to obtain the thermal sensitive element. The liquid crystal cell is made of a glass sheet coated with an alignment agent, the thickness is controlled by glass fiber to 8mm, holes are left at the upper and lower ends, and the rest is encapsulated with epoxy resin. According to attached figure 1 An optical system is formed, and the heat sensitive element is put into the system. The infrared radiation emitted by the object shines on the heat sensitive element through the infrared lens and the beam splitter. Another beam of laser light is also irradiated on the heat sensitive element through the collimator, polarizer and beam splitter. Infrared light is absorbed by the infrared absorbing material in the heat sensitive element, and the optical rotation effect of the liqu...

Embodiment 3

[0029] Add a certain amount of infrared absorbing material into the liquid crystal, heat the liquid crystal to above the clearing point, use the capillary phenomenon to fill the mixture of liquid crystal and infrared absorbing material into the twisted liquid crystal cell, and become a twisted liquid crystal cell with optical rotation effect, that is, heat sensitive Yuan. According to attached figure 1 Build the optical system and put the heat sensitive element into the system. When the infrared radiation emitted by the object shines on the heat sensitive element through the infrared lens and the beam splitter, it is absorbed by the infrared absorbing material in the liquid crystal cell, causing the temperature of the liquid crystal to rise. Due to the optical rotation effect of the twisted nematic liquid crystal cell, the polarization direction of another beam of visible light passing through the collimating mirror and the polarizer to the heat sensitive element changes,...

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Abstract

The invention relates to the technical field of non-electrical readout infrared thermal imaging, in particular to a liquid crystal rotation effect-based non-electrical readout thermal imaging detection method, which aims to solve the problem of complex technology and expensive economic cost of the conventional electrical readout infrared thermal detector. To solve the problem of the prior art, the invention provides the liquid crystal rotation effect-based non-electrical readout thermal imaging detection method in which a detected object is imaged by using the strong sensitizing effect of theoptical activity of the liquid crystal to temperature. A device constructed according to the method comprises an infrared lens, a beam splitter, a heat reactive element, an analyzer, a charge coupleddevice (CCD) and a computer which are positioned on the same main optical axis, and a visible light source, a collimation lens, and a polarizer which are arranged sequentially; optical axes of the visible light source, the collimation lens, and the polarizer are vertical to the main optical axis to be converged to the beam splitter; and one side of the heat reactive element, on which an infrared absorption material is plated is near the analyzer. Compared with the prior art, the method has the advantages of simplicity, low cost, and wide application range.

Description

technical field [0001] The invention relates to the technical field of non-electrical readout infrared thermal imaging, in particular to a non-electrical readout thermal imaging detection method based on the optical rotation effect of liquid crystals. Background technique [0002] At present, the principle of most infrared detectors is mainly electrical readout, that is, a device that converts the incident infrared radiation signal into an electrical signal output. According to the energy conversion method, infrared detectors can be divided into two categories: thermal detectors and photon detectors: [0003] 1) The photon detector is based on the photoelectric effect generated by the interaction between the incident photon flow and the detection material. The specific performance is that the detector responds to the change in the number of free carriers (that is, electrons and / or holes), and then converts the electrical signal into an image. output. This detector is done...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/58G01J5/08
Inventor 刘卫国蔡长龙牛小玲张雅
Owner XIAN TECH UNIV
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