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Fabrication method of fluorescent sensitive film for optical fiber explosive sensor, optical fiber explosive sensor and explosive vapor detection system

A technology for sensitive thin films and explosives, applied in the directions of fluorescence/phosphorescence, light guides doped with fluorescent agents, cladding fibers, etc. It can solve the problems of low saturated vapor pressure and the inability of sensors to achieve fast film formation and improved response. Speed ​​and sensitivity, high yield effect

Active Publication Date: 2022-02-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the deficiencies in the prior art, propose a kind of optical fiber explosives sensor fluorescence sensitive film preparation method, optical fiber explosives sensor and explosives vapor detection system, to solve the problem caused by nitroaromatics explosives such as TNT, DNT, etc. The saturated vapor pressure is extremely low, and the existing sensors cannot realize the technical problems of fast, long-distance, safe and trace detection of TNT, DNT and other nitroaromatic explosives

Method used

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  • Fabrication method of fluorescent sensitive film for optical fiber explosive sensor, optical fiber explosive sensor and explosive vapor detection system
  • Fabrication method of fluorescent sensitive film for optical fiber explosive sensor, optical fiber explosive sensor and explosive vapor detection system
  • Fabrication method of fluorescent sensitive film for optical fiber explosive sensor, optical fiber explosive sensor and explosive vapor detection system

Examples

Experimental program
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preparation example Construction

[0040] In this embodiment, the method for preparing the fluorescent sensitive film of the optical fiber explosive sensor comprises the following steps:

[0041] 1) Seal the cladding air holes of the hollow-core photonic crystal fiber (HC-PCF) with UV-curable glue; the structure of the hollow-core photonic crystal fiber is as follows figure 2 As shown, it includes silica glass cladding 1 , core air holes 2 and cladding air holes 3 .

[0042] According to the knowledge of fluid mechanics, when the solution is filled by the capillary action of the hollow core photonic crystal fiber (HC-PCF) air hole, the filling speed can be obtained according to the following related formula:

[0043]

[0044] Among them, υ is the average speed of UV curing glue in the HC-PCF air hole, r is the radius of the HC-PCF air hole, Δp is the air pressure difference at both ends of the HC-PCF air hole, l is the distance length filled by the UV curing glue, μ is the viscosity of the UV-curable adhes...

example 1

[0076] Example 1: The thickness of the fluorescent vapor sensitive film containing enphenyltetraphenylethylene coated on the inner wall of the core of the hollow-core photonic crystal fiber is 50 nm. Taking trinitrotoluene, 2-4 dinitrotoluene, 2-6 dinitrotoluene, p-nitrotoluene, 1, 3, 5 trinitrotoluene and the vapor of water at saturated vapor pressure as the research objects, Make each research object interact with the fluorescent sensitive film on the inner wall of the fiber core air hole respectively.

[0077] In the experiment, the known saturated vapor pressure concentration is 0ppb (water), 10ppb (trinitrotoluene), 20ppb (1,3,5-trinitrotoluene), 400ppb (2,4 dinitrotoluene), 650ppb ( The explosive vapors of p-nitrotoluene) and 900ppb (2,6-dinitrotoluene) were detected respectively, and the corresponding fluorescence intensity changes ΔI were measured as 0, 950 (a.u), 1740 (a.u), 9784 (a.u ), 12700(a.u), 15860(a.u), the obtained linear regression equation is: ΔI=17.504c+1...

example 2

[0079] Example 2: The thickness of the fluorescent film of explosive vapor containing enphenyltetraphenylethylene coated on the inner wall of the core of the hollow-core photonic crystal fiber is 100 nm. The known saturated vapor pressure concentration is 0ppb (water), 10ppb (trinitrotoluene), 20ppb (1,3,5-trinitrotoluene), 400ppb (2,4-dinitrotoluene), 650ppb (p-nitrotoluene) Toluene) and 900ppb (2,6 dinitrotoluene) explosive vapors were detected respectively. The corresponding fluorescence intensity change ΔI is 0, 1020(a.u), 1966(a.u), 10040(a.u), 13680(a.u), 17840(a.u), then the linear regression equation is: ΔI=19.353c+1037.9, correlation coefficient R 2 =0.9879, that is, k and b in the linear regression equation are 19.353 and 1037.9 respectively.

[0080] When the explosive vapor to be measured is in contact with the sensitive film on the inner surface of the air hole of the hollow-core photonic crystal fiber core, the average change in fluorescence intensity ΔI is 678...

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Abstract

The invention discloses a preparation method for a fluorescent sensitive film of an optical fiber explosive sensor, an optical fiber explosive sensor and an explosive vapor detection system. The preparation method of the fluorescent sensitive film includes cleaning the inner wall of the fiber core air hole of the optical fiber, activating the hydroxyl groups on the quartz surface, placing the optical fiber in an ethanol solution of vinyltrimethoxysilane to prepare a fluorescent mixed solution, and using a pneumatic drive device to The fluorescent mixed solution passes into the air hole of the fiber core to form a fluorescent sensitive film of explosive vapor. The fiber optic explosive sensor includes a hollow-core photonic crystal fiber and a fluorescent sensitive film for explosive vapor. Explosive vapor detection system includes semiconductor laser, optical fiber explosive sensor, test gas chamber, spectrometer and computer. The fluorescence sensitive film in the invention has high fluorescence quantum yield and stable fluorescence light intensity; when explosive vapor molecules are in full contact with the fluorescence sensitive film, the fluorescence intensity will change significantly, and the sensor has high sensitivity.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a hollow-core photonic crystal optical fiber explosive vapor sensing device based on fluorescence quenching for obtaining explosive vapor concentration. Background technique [0002] Worldwide, terrorist activities are rampant, and terrorist bombings are on the rise year by year, seriously threatening the safety of people's lives and property. According to relevant statistics, in most of the terrorist bombings, the commonly available trinitrotoluene (TNT), dinitrotoluene (DNT) and other nitroaromatic explosives are used, but the saturated vapor of such explosives The pressure is extremely low and cannot be easily detected. Therefore, realizing fast, remote, safe, trace detection of TNT, DNT, etc. is of great significance to national security, social security and people's property security. [0003] At present, the techniques for detecting the volatilized vapor of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/64G02B6/00G02B6/02
CPCG01N21/643G02B6/0003G02B6/02328G01N2021/6432
Inventor 杨建春沈睿晏培新李小冰
Owner CHONGQING UNIV
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