CN103674909A - Sensor for detecting gas nitro-aromatics explosives - Google Patents
Sensor for detecting gas nitro-aromatics explosives Download PDFInfo
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- CN103674909A CN103674909A CN201310446038.7A CN201310446038A CN103674909A CN 103674909 A CN103674909 A CN 103674909A CN 201310446038 A CN201310446038 A CN 201310446038A CN 103674909 A CN103674909 A CN 103674909A
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Abstract
The invention relates to a sensor for detecting gas nitro-aromatics explosives, wherein an optical fiber sensing head with a fire core exposed type structure is arranged in a gas chamber, a fluorescent material MEH-PPV which is sensitive to nitro-aromatics explosives is coated on the fiber core surface of the optical fiber sensing head with the fire core exposed type structure; a gas inlet and a gas outlet are formed on the gas chamber for explosive gas in various concentrations to run through; the light emitted from a laser is focused and coupled into the optical fiber sensing head with the fire core exposed type structure via a first focusing lens, the output laser and fluorescence are filtered by a high-pass filter of which the cutoff wavelength is 510nm, and finally are focused and transmitted into a spectrograph via a second lens. The concentration of gas explosives is detected by detecting the fluorescence intensity of the fluorescent material with the spectrograph. Compared with a similar product, the sensor provided by the invention has advantages that the lower limit of detection and the sensitivity can be improved. Due to the adoption of the exposed optical fiber, the fluorescent material coated around an air hole can directly interact with the gas explosives; and furthermore, the sensor has the advantages of high detection speed, stable working performance, small amount of required sample, and the like.
Description
Technical field
The present invention relates to a kind of sensor, particularly a kind of fibre core exposed type microstructured optical fibers that utilizes detects the sensor of gas nitro arene explosive substance as sensing head.
Background technology
Explosives detection techniques can be for fields such as anti-terrorism, nonmetallic mine detection and environmental quality monitorings.Particularly in recent years, international terrorist activities is day by day savage, and according to related data statistics, only one of the terrorist bombings accounts for 57% of global terrorist operations.The nitro arene explosive substances such as trinitro-toluene (TNT) are because its brisance is large and low price is often used by terrorist, and in 21 kinds of compounds relevant to explosive, all contain TNT, and it is to attach product and catabolite.Therefore in order effectively to control and to combat terrorist activities, safeguard the country and people's safety, develop highly sensitive, detection time is short, the nitro arene explosive substance new detecting method of stable working state, new equipment have great far-reaching economy and social effect, becomes the focus that countries in the world are paid close attention to.
At present, the detection of microscratch amount nitro arene explosive substance can be undertaken by electrochemical method, molecular imprinting method, ion mobility spectrometry method, bio-sensing method and optical means etc.Wherein again with optical means, particularly fluorescent quenching method is paid close attention to by people most, this is owing to comparing with additive method, that fluorescence quenching method has is highly sensitive, selectivity good, detection speed is fast, sensor bulk is little, cost is low, the feature such as easy and simple to handle, is considered to one of optimal technology of current trace explosive context of detection.
Fibre core exposed type microstructure optical fiber sensing head schematic cross-section as shown in Figure 1, the middle fibre core 4-2 diameter of fibre core exposed type microstructured optical fibers is 10 microns, having 2 apertures is around the airport 4-1 of 8 microns, the non-closure of another one airport 4-4 and then part fibre core is exposed, external diameter 4-3 is 125 microns.The advantage of this sensing head is that fluorescence indicator can directly be coated to around airport, detected gas nitro arene explosive substance can be directly and fluorescence indicator interact, detection time is short.
At present the main difficult technical of the microscratch amount explosives sensor based on Fluorescence Quenching Principle be fluorescence indicator fluorescence intensity a little less than, thereby increased, survey the difficulty of fluorescence signal, and make the sensitivity of system and detect lower limit and reduce.
Summary of the invention
The present invention be directed to the current microscratch amount explosives sensor based on Fluorescence Quenching Principle because the problem that the fluorescence intensity of fluorescence indicator causes detection sensitivity to reduce a little less than, a kind of sensor that detects gas nitro arene explosive substance is proposed, the intensity of fluorescence indicator can reduce along with the increase of explosive concentration, by surveying the fluorescence intensity of fluorescence indicator, the concentration of explosive is carried out to detection sensitivity reduction, because the evanescent wave intensity of fibre core exposed type microstructured optical fibers is larger, and then the luminous intensity of raising fluorescence indicator, reach the sensitivity of raising system and the object of detection lower limit, can well solve the problem that current sensors with auxiliary electrode were exists.
Technical scheme of the present invention is: a kind of sensor that detects gas nitro arene explosive substance, comprise laser instrument, two condenser lenses, shelve the adjustment rack of condenser lens, fibre core exposed type microstructure optical fiber sensing head, air chamber, high-pass filter, spectrometer, fibre core exposed type microstructure optical fiber sensing head is placed in air chamber, fibre core exposed type microstructure optical fiber sensing head surface is coated with the fluorescent material MEH-PPV to nitro-aromatic class class explosive sensitivity, on air chamber, there are gas feed and outlet, the light that laser instrument sends focuses on through the first condenser lens, the first condenser lens emitting laser enters in fibre core exposed type microstructure optical fiber sensing head through the coupling of end face coupling process, the laser of fibre core exposed type microstructure optical fiber sensing head output and the high-pass filter of fluorescence through being 510nm by wavelength filter, finally by the second lens focus, enter spectrometer, spectrometer is surveyed the fluorescence intensity of fluorescent material gas burst substrate concentration in air chamber is surveyed.
The light that described laser instrument sends focuses on through the first condenser lens, regulates the adjustment rack under the first condenser lens, makes the first condenser lens shoot laser be coupled to the fiber end face of fibre core exposed type microstructure optical fiber sensing head.
Beneficial effect of the present invention is: a kind of sensor that detects gas nitro arene explosive substance of the present invention, can improve compared with similar products and detect lower limit and sensitivity.In addition, this sensor is because fibre core exposes, and being coated in airport fluorescent material around can be directly and the interaction of gas explosive, have detection speed soon, the advantage such as stable work in work, required sample size be little.
Accompanying drawing explanation
Fig. 1 is fibre core exposed type microstructure optical fiber sensing head schematic cross-section;
Fig. 2 is the sensor construction schematic diagram that the present invention detects gas nitro arene explosive substance.
Embodiment
Detect as shown in Figure 2 the sensor construction schematic diagram of gas nitro arene explosive substance, comprise laser instrument 1, condenser lens 2, shelve adjustment rack 3, fibre core exposed type microstructure optical fiber sensing head 4, air chamber 5, high-pass filter 6, condenser lens 7, the spectrometer 8 of condenser lens 2.Fibre core exposed type microstructure fiber sensor head schematic cross-section as shown in Figure 2 wherein.
The preparation of fibre core exposed type microstructure optical fiber sensing head 4: first sensitive material MEH-PPV is dissolved in methenyl choloride, concentration is 0.5mg/ml.Then the fibre core exposed type microstructure optical fiber sensing head 4 of 20 centimeter length is placed in to this sensitive material, places 5 minutes.Take out to be placed in the baking oven that temperature is 80 degree and place 10 minutes, after methenyl choloride volatilization, from baking oven, take out.
After the light line focus lens 2 that laser instrument 1 sends focus on, adjust adjustment rack 3, make condenser lens 2 emitting lasers adopt the coupling of end face coupling process to enter in fibre core exposed type microstructure optical fiber sensing head 4, the end face of fibre core exposed type microstructure optical fiber sensing head 4 is as Fig. 1 schematic cross-section.
Fibre core exposed type microstructure optical fiber sensing head 4 is placed in to air chamber 5, on air chamber 5, has gas feed and outlet, for passing through the explosive gas of variable concentrations; Laser in optical fiber and fluorescence, by the high-pass filter 6 that is 510nm by wavelength, enter in spectrometer 8 finally by lens focus 7.By spectrometer, surveying the fluorescence intensity of fluorescent material surveys gas burst substrate concentration.
Claims (2)
1. a sensor that detects gas nitro arene explosive substance, it is characterized in that, comprise laser instrument, two condenser lenses, shelve the adjustment rack of condenser lens, fibre core exposed type microstructure optical fiber sensing head, air chamber, high-pass filter, spectrometer, fibre core exposed type microstructure optical fiber sensing head is placed in air chamber, fibre core exposed type microstructure optical fiber sensing head surface is coated with the fluorescent material MEH-PPV to nitro-aromatic class class explosive sensitivity, on air chamber, there are gas feed and outlet, the light that laser instrument sends focuses on through the first condenser lens, the first condenser lens emitting laser enters in fibre core exposed type microstructure optical fiber sensing head through the coupling of end face coupling process, the laser of fibre core exposed type microstructure optical fiber sensing head output and the high-pass filter of fluorescence through being 510nm by wavelength filter, finally by the second lens focus, enter spectrometer, spectrometer is surveyed the fluorescence intensity of fluorescent material gas burst substrate concentration in air chamber is surveyed.
2. detect according to claim 1 the sensor of gas nitro arene explosive substance, it is characterized in that, the light that described laser instrument sends focuses on through the first condenser lens, regulate the adjustment rack under the first condenser lens, make the first condenser lens shoot laser be coupled to the fiber end face of fibre core exposed type microstructure optical fiber sensing head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310446038.7A CN103674909A (en) | 2013-09-27 | 2013-09-27 | Sensor for detecting gas nitro-aromatics explosives |
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| CN201310446038.7A CN103674909A (en) | 2013-09-27 | 2013-09-27 | Sensor for detecting gas nitro-aromatics explosives |
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| CN103674909A true CN103674909A (en) | 2014-03-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089938A (en) * | 2014-07-22 | 2014-10-08 | 苏州迅康纳米科技有限公司 | Non-contact nano-explosive detecting device |
| CN105548074A (en) * | 2015-12-31 | 2016-05-04 | 郑州光力科技股份有限公司 | Self-calibrating gas chamber and detecting system for gas sensor using self-calibrating gas chamber |
| CN107037019A (en) * | 2017-04-01 | 2017-08-11 | 陕西师范大学 | Laminated construction fluorescent optical sensor |
| CN109406439A (en) * | 2018-11-20 | 2019-03-01 | 宁波大学 | Gas sensor, the preparation method of gas sensor and gas-detecting device |
| CN110563766A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Fluorescent gas-sensitive material and application thereof to benzene series sensor |
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| WO2009012528A1 (en) * | 2007-07-24 | 2009-01-29 | Adelaide Research & Innovation Pty Ltd | Optical fiber sensor |
| CN101419217A (en) * | 2008-11-25 | 2009-04-29 | 上海电力学院 | Sensing head for detecting nitro arene explosive substance and method for making same |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089938A (en) * | 2014-07-22 | 2014-10-08 | 苏州迅康纳米科技有限公司 | Non-contact nano-explosive detecting device |
| CN105548074A (en) * | 2015-12-31 | 2016-05-04 | 郑州光力科技股份有限公司 | Self-calibrating gas chamber and detecting system for gas sensor using self-calibrating gas chamber |
| CN107037019A (en) * | 2017-04-01 | 2017-08-11 | 陕西师范大学 | Laminated construction fluorescent optical sensor |
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| CN107037019B (en) * | 2017-04-01 | 2024-01-23 | 陕西师范大学 | Lamination structure fluorescence light sensor |
| CN110563766A (en) * | 2018-06-06 | 2019-12-13 | 中国石油化工股份有限公司 | Fluorescent gas-sensitive material and application thereof to benzene series sensor |
| CN109406439A (en) * | 2018-11-20 | 2019-03-01 | 宁波大学 | Gas sensor, the preparation method of gas sensor and gas-detecting device |
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Application publication date: 20140326 |