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An infrared narrow-band filter film and an infrared identification system

A narrow-band filtering and infrared technology, applied in the field of optical film, can solve the problem of low image acquisition accuracy, and achieve the effects of avoiding interference, improving accuracy, and high discrimination

Active Publication Date: 2021-08-10
ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide an infrared narrow-band filter film and an infrared identification system to solve the problem of low accuracy in image acquisition of infrared image cameras in the prior art

Method used

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  • An infrared narrow-band filter film and an infrared identification system
  • An infrared narrow-band filter film and an infrared identification system
  • An infrared narrow-band filter film and an infrared identification system

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preparation example Construction

[0051] In addition, the present application also provides a method for preparing the above-mentioned visible light cut-off film system, the preparation method includes: step S1, setting a high refractive index material layer 21 on the base material layer 1; step S2, setting a matching layer on the high refractive index material layer 21 material layer 22 ; and optionally repeating step S3 one or more times, disposing the high-refractive-index material layer 21 on the matching material layer 22 , and disposing the matching material layer 22 on the high-refractive-index material layer 21 .

[0052] Preferably, the high refractive index material layer 21 is an α-hydrogenated amorphous silicon layer, the matching material layer 22 is an oxide layer, and the oxide layer is a metal oxide layer or a non-metal oxide layer. Both layers and oxide layers can be fabricated using methods commonly used in the art. In order for the two to contact to form a stable The structure, preferably,...

Embodiment 1

[0077] The structure of the infrared narrowband filter film of this embodiment is as follows figure 1 As shown, that is, the substrate layer, the visible light cut-off film system and the infrared window film system are stacked in sequence. The structure of each membrane system is as follows:

[0078] The structure of the visible light cut-off film system is Sub|1.376L1.795H|Sub|5.003H0.236L|Air, wherein: Sub is the substrate layer, Air is air; H is α-hydrogenated amorphous silicon layer, and the refractive index is 4.306; L is the silicon dioxide layer, the refractive index is 1.470, you can refer to figure 1 .

[0079] The above-mentioned visible light cut-off film is prepared by vacuum magnetron sputtering method:

[0080] (1) Forming a hydrogenated amorphous silicon layer on a substrate

[0081] The glass substrate layer is strictly cleaned before use: soaked in a standard washing solution (saturated solution of potassium permanganate of sulfuric acid) for 24 hours; th...

Embodiment 2

[0095] The difference from Example 1 is that the structure of the infrared window film system is designed as

[0096] Sub|0.934H 1.018L 1.013H 1.133L 1.274H 1.402L 1.481H 1.635L 1.814H1.894L 1.981H2.223L 0.792H 1.067L 1.057H 1.195L 1.272H 1.435L 1.519H 1.641L1.774H 1.886L 2.012H2.134L |Air, in which there are two membrane stacks:

[0097] 0.934H 1.018L 1.013H 1.133L 1.274H 1.402L 1.481H 1.635L 1.814H 1.894L 1.981H 2.223L;

[0098] 0.792H 1.067L 1.057H 1.195L 1.272H 1.435L 1.519H 1.641L 1.774H 1.886L 2.012H 2.134L.

[0099] The above infrared narrow-band filter films were tested by a full-wavelength transmittance meter. The test results are shown in Figure 4 . according to Figure 4 It can be seen that the wavelength range of infrared light transmission is 900-1000nm, the center wavelength is 950nm, and the bandwidth is less than 50nm, the transmittance is also large, and the visible light is basically completely cut off.

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Abstract

The invention provides an infrared narrow-band filter film and an infrared identification system. The infrared narrow-band filter film includes: a base material layer; a visible light cut-off film system, used to absorb or reflect visible light in the range of 380nm to 780nm; an infrared window film system, with one or more narrow-band light-transmitting windows in the range of 700-1400nm. The peak width of the narrow-band light-transmitting window when the transmittance is greater than or equal to 50% is in the range of 5 to 50nm; the visible light cut-off film system and the infrared window film system are relatively arranged on the two surfaces of the base material layer or stacked on the base material layer on one surface. At the same time, it is equipped with a visible light cutoff film system and an infrared window film system, which realizes the effective cutoff of visible light, allowing the narrow band of infrared rays to pass through, avoiding the interference of visible light, and using infrared light to achieve higher discrimination and improve visual hierarchy. The effect can greatly improve the accuracy of biological identification and improve the accuracy of the final infrared image camera image collection.

Description

Technical field [0001] The present invention relates to the field of optical films, and specifically to an infrared narrow-band filter film and an infrared identification system. Background technique [0002] Facial recognition is also called face recognition, facial image recognition, facial recognition, etc. Facial recognition uses a general-purpose camera as an identification information acquisition device. The facial image of the recognition subject is acquired in a non-contact manner, and the computer system completes the recognition process after acquiring the image and comparing it with the database image. Facial recognition is an identification method based on biometrics. Compared with traditional identification methods such as fingerprint recognition, it has the characteristics of real-time, accurate, high-precision, easy to use, high stability, difficult to counterfeit, cost-effective and non-intrusive. It is easier to be User accepts. A regional feature analysis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/28G02B5/22G06K9/20
Inventor 于甄张国臻夏振
Owner ZHANGJIAGANG KANGDE XIN OPTRONICS MATERIAL
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