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A method for detecting infrared radiation

An infrared radiation and infrared technology, applied in the field of infrared radiation detection, can solve the problems of low infrared up-conversion efficiency and so on

Inactive Publication Date: 2017-10-27
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the traditional shortcomings of low infrared up-conversion efficiency involving multi-photon processes, the present invention proposes a method for detecting infrared radiation based on the infrared up-conversion effect of long-lasting luminescent materials

Method used

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  • A method for detecting infrared radiation
  • A method for detecting infrared radiation
  • A method for detecting infrared radiation

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0027] The background light source is an ultraviolet LED with a wavelength λ of 350nm and a power of 50mW. Under the irradiation of an infrared light pulse with a wavelength of 980nm, a power of 10mW, and a pulse width of 0.3 seconds, the detection galvanometer shows that the current increases, as shown in image 3 . It can be seen that the method can effectively detect 980nm infrared light.

experiment example 2

[0029] The background light source is a blue-violet LED with a wavelength λ of 407nm and a power of 80mW. Before and after continuous mid-infrared light irradiation with a wavelength of 1750nm and a power of 20mW, the detection galvanometer shows the change of the current, as shown in Figure 4 . It can be seen that the method can effectively detect 1750nm infrared light.

experiment example 3

[0031] The background light source is a blue LED with a wavelength λ of 450nm and a power of 100mW. Under the irradiation of an infrared light pulse with a wavelength of 1350nm and a power of 15mW, the detection galvanometer shows that the current increases significantly.

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Abstract

The invention discloses a method for detecting infrared radiation. The photon energy corresponding to infrared radiation is small, and it is difficult to detect it with silicon-based photodetectors. The invention uses the background light source to excite electrons to the Dy3+ trap energy level in the forbidden band of the SrAl2O4:(Eu2+, Dy3+) material, and the emission wavelength of the background light source is 350-450nm. When irradiated by infrared light, the electrons in the trap energy level can jump to the conduction band, and further transfer to the Eu2+ energy level to radiate green light, causing the enhancement of the visible light radiation intensity. The intensity of infrared radiation can be measured indirectly by measuring the intensity of green light emitted by SrAl2O4: (Eu2+, Dy3+). The present invention uses SrAl2O4:(Eu2+, Dy3+) material as the up-conversion material, and the conversion process does not involve multi-photon process, so the conversion efficiency is high, and the infrared radiation can be effectively detected only under the illumination of the background light source.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to an infrared radiation detection method. Background technique [0002] Due to the small photon energy corresponding to infrared radiation, it is not easy to detect it with silicon-based photodetectors. Since the forbidden band width of silicon is only 1.12eV, the corresponding upper-line wavelength of infrared detection is about 1100nm. Therefore, theoretically, silicon-based photodetection technology based on photogenerated carriers cannot detect infrared radiation with a wavelength greater than 1100nm. Infrared up-conversion is to convert the difficult-to-detect infrared radiation into the easier-to-detect visible light for detection. It has potential application value in the fields of infrared radiation detection, biological identification and monitoring, drug treatment and marking, and military sensing. At present, most infrared up-conversion mainly uses multi-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J5/10
Inventor 季振国包文浩李鹤
Owner HANGZHOU DIANZI UNIV