CN101750403A - Fluorescent optical fiber sensor for detecting nitrogen dioxide - Google Patents
Fluorescent optical fiber sensor for detecting nitrogen dioxide Download PDFInfo
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- CN101750403A CN101750403A CN200810229876A CN200810229876A CN101750403A CN 101750403 A CN101750403 A CN 101750403A CN 200810229876 A CN200810229876 A CN 200810229876A CN 200810229876 A CN200810229876 A CN 200810229876A CN 101750403 A CN101750403 A CN 101750403A
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- optical fiber
- branch optical
- detection cell
- nitrogen dioxide
- fluorescent film
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Abstract
The invention relates to a fluorescent optical fiber sensor for detecting nitrogen dioxide, which comprises an excitation light source, a branch optical fiber and a NO2 nano-fluorescent thin film, wherein an optical path of the excitation light source is coupled with an incident end of the branch optical fiber, a receiving end of the branch optical fiber is coupled with a photoelectric conversion device, and the NO2 nano-fluorescent thin film is arranged on the outer side of the end surface of a total end of the branch optical fiber. The nitrogen dioxide sensor has the advantages of low cost, high performance, rapid response, good stability and easy miniaturization, and can be used for real-time on-line detection of low-concentration nitrogen dioxide gas.
Description
Technical field
The present invention relates to a kind of fluorescent optical fiber sensor that detects nitrogen dioxide, relate to the optical sensor of low concentration nitrogen dioxide gas in a kind of on-the-spot on-line determination air specifically, belong to the sensor field technology.
Background technology
Nitrogen dioxide (NO
2) mainly from the waste gas and the vehicle exhaust of coal combustion generation, be the stronger air pollutants of a kind of toxicity, be the principal ingredient of environmental problems such as acid rain, photo-chemical smog, be detrimental to health.The method that detects nitrogen dioxide mainly contains chemoluminescence method and electrochemical process.The former gases affect that coexisted easily, the latter then needs experiment conditions such as accurate control electrode electromotive force and temperature.Detecting instrument based on these 2 kinds of methods mostly is large-scale instrument, costs an arm and a leg, and all is not easy to carry out the nitrogen dioxide field monitoring.
Summary of the invention
The purpose of this invention is to provide a kind of fluorescent optical fiber sensor that detects low concentration nitrogen dioxide, its cost is low, performance is high, response is rapid, good stability, be easy to microminiaturization; Utilize nitrogen dioxide that specific fluorescent reagent emitted fluorescence is had quenching effect, low concentration nitrogen dioxide is detected.
For achieving the above object, the technical solution used in the present invention is:
A kind of fluorescent optical fiber sensor that detects nitrogen dioxide comprises excitation source, branch optical fiber, NO
2The nano fluorescent film, the incident end of the light path of described excitation source and branch optical fiber is coupled, and the receiving end and the electrooptical device of branch optical fiber are coupled, and total end end face arranged outside of branch optical fiber has NO
2The nano fluorescent film.
Described NO
2The nano fluorescent thin film cladding is provided with optical filter in transparent carrier sheet upper surface between the receiving end of branch optical fiber and the electrooptical device.
Total end of described branch optical fiber in transparent carrier sheet lower surface, and is coated on the NO that shows on the transparent carrier sheet by the optical coupler fixed coupling
2The nano fluorescent film is corresponding.
The incident end of described branch optical fiber is by optical coupler and excitation source fixed coupling, and the receiving end of branch optical fiber is by optical coupler and electrooptical device fixed coupling; Total end of branch optical fiber is fixed in the top of a detection cell by optical coupler, and total end of branch optical fiber stretches into detection cell, is coated on the NO on the transparent carrier sheet
2The nano fluorescent film place in the detection cell and be positioned at branch optical fiber always end face under, be provided with catoptron at the lower surface of transparent carrier sheet, receive the fluorescence intensity of fiber end face to the total termination of branch optical fiber with enhanced rad; Described detection cell is provided with sample gas inlet and sample export; Between the optical coupler at detection cell top and detection cell, carry out air seal by " O " circle.
Described excitation source is the flashlight that High Power LED maybe can be launched suitable wavelength; The incident end of described branch optical fiber transfers to the sensitive fluorescent film with exciting light; Described quartzy branch optical fiber receiving end transfers to electrooptical device with fluorescence; Described NO
2Nano fluorescent film (201) refers to be embedded with fluorescence probe perylene or Ti (Pc)
2The fluorescence sense film.
Described detection cell can be by metal material or nonmetallic materials, process as polyetheretherketone (PEEK) or Teflon (Teflon) or Polyvinylchloride transparent materials such as (PVC).
The present invention has following advantage:
Described a kind of fluorescent optical fiber sensor that detects nitrogen dioxide, this sensor is made up of the fluorescence nano film of optical system and nitrogen dioxide.This sensor has the following advantages:
Sensor-based system can with different nitrogen dioxide fluorescence nano film combinations, greatly simplified operation and apparatus structure, help enlarging the range of application of instrument.
2. adopting cheap light emitting diode is light source, greatly the cost of manufacture of lowering apparatus.
3. compare with electrochemical process with traditional chemoluminescence method, fluorescence method has highly sensitive and the good advantage of selectivity.Selection has the fluorescent reagent of special response to nitrogen dioxide, can eliminate other gas, as SO
2, CO, Cl
2And NH
3Interference Deng gas.
In a word, described sensor cost is low, performance is high, response is rapid, good stability, be easy to realize the microminiaturization of sensor, and the real-time online that can be used for the nitrogen dioxide gas of low concentration detects.
Description of drawings
Fig. 1 has the synoptic diagram of fluorescent optical fiber sensor of the nitrogen dioxide of detection cell for a kind of detection;
Fig. 2 is a kind of synoptic diagram of fluorescent optical fiber sensor of the sonde-type nitrogen dioxide that does not have a detection cell;
Among the figure: 101 is excitation source (as: High Power LED or pulsed light source), and 102 is branch optical fiber, and 103 for receiving the electrooptical device (as: photomultiplier or silicon photocell or CCD spectrometer) of fluorescence, 104 is optical filter, 105 is optical coupler, and 201 is nitrogen dioxide nano fluorescent film, and 202 is the transparent carrier sheet, 203 is mirror surface, 301 is the detection cell body, and 302 is test chamber, and 303 is sample inlet, 304 is sample export, and 305 are sealing " O " circle;
Fig. 3 is the fluorescence spectrum response diagram of the fluorescent optical fiber sensor of nitrogen dioxide to variable concentrations nitrogen dioxide.
Embodiment
Embodiment 1
As shown in Figure 1, a kind of fluorescent optical fiber sensor that detects nitrogen dioxide, it is the sonde configuration that has detection cell, comprises excitation source 101 (High Power LED), branch optical fiber 102, NO
2Nano fluorescent film 201, the incident end of the light path of described excitation source 101 and branch optical fiber 102 is coupled, and the receiving end of branch optical fiber 102 and electrooptical device 103 (CCD spectrometer) are coupled, and total end end face arranged outside of branch optical fiber 102 has NO
2Nano fluorescent film 201.Described NO
2Nano fluorescent film 201 is coated on transparent carrier sheet 202 upper surfaces, is provided with optical filter 104 between the receiving end of branch optical fiber 102 and the electrooptical device 103.
The incident end of described branch optical fiber 102 is by optical coupler 105 and excitation source 101 fixed coupling, and the receiving end of branch optical fiber 102 is by optical coupler 105 and electrooptical device 103 fixed coupling; Total end of branch optical fiber 102 is fixed in the top of a detection cell 301 by optical coupler 105, and total end of branch optical fiber 102 stretches into detection cell 301, is coated on the NO on the transparent carrier sheet 202
2Nano fluorescent film 201 place in the detection cell 301 and be positioned at branch optical fiber 102 total end end faces under, be provided with catoptron 203 at the lower surface of transparent carrier sheet 202, with the fluorescence intensity of enhanced rad to branch optical fiber 102 total terminations receipts fiber end faces.
Described detection cell 301 is provided with sample gas inlet 303 and sample export 304, and the cavity of detection cell 301 inside is a test chamber 302; Between the optical coupler 105 at detection cell 301 tops and detection cell 301, carry out air seal by " O " circle 305.
Detection cell body of the present invention and fiber coupler can be processed by non-metallic materials such as metal material or macromolecules.Wherein metal material can be stainless steel, titanium-aluminium alloy etc.; Nonmetallic materials such as pottery; Macromolecular material such as polyetheretherketone (PEEK), Teflon (Teflon) or Polyvinylchloride (PVC) etc.
Described excitation source 101 maybe can be launched the flashlight of suitable wavelength for High Power LED; Described CCD spectrometer is used for receiving and handling fluorescence signal; Nitrogen dioxide sensitive fluorescent film 201 is by nitrogen dioxide photaesthesia molecule is obtained in embedding techniques is fixed on the transparent material of certain collosol and gel matrix or organic polymer;
The testing process of nitrogen dioxide is as follows:
1) detection cell pond body 301 receives and disposal system 103 couplings by branch optical fiber 102 and signal by branch optical fiber 102 and light emitting diode 101 couplings.
2) be provided with optical filter 104 between reception of branch optical fiber 102 and signal and the disposal system 103.
3) High Power LED of sensor employing is an excitation source 101, excitation source 101 is by fiber coupler 105 and branch optical fiber 102 couplings, exciting light shines on the nitrogen dioxide sensitive fluorescent film 201 by branch optical fiber 102 incident ends, and the fluorescence of generation is branched the collection of optical fiber 102 receiving ends and transmits after filtration and detects in mating plate 104 to the CCD spectrometers 103.
4) sensitive fluorescent film 201 is coated on carrier glass sheet 202 upper surfaces usually, and carrier glass sheet 202 lower surfaces are fixed in reflecting optics 203 upper surfaces, and reflecting optics 203 is fixed in flow cell 301 bottom centre positions, and is relative with branch optical fiber 102 total ends.
5) selection of nitrogen dioxide sensitive fluorescent film: select to be embedded with the nitrogen dioxide sensitive fluorescent film of fluorescence probe, as be embedded with perylene[Sens.Actuators B Chem.2001,72:51.] or Ti (Pc)
2(Sens.Actuators B Chem.2001,74:12.] etc. fluorescent probe molecule as the fluorescence sense film.
Application examples
On being installed in the nitrogen dioxide sensitive fluorescent film that is embedded with fluorescence probe perylene in the embodiment 1 described flow cell, the purple High Power LED that with centre wavelength is 390nm is a light source, by branch optical fiber one end the nitrogen dioxide sensitive fluorescent membrane is excited, emitting fluorescence enters CCD spectrometer (USB4000) by long pass filter (LP400) and detects through the transmission of the emission branch optical fiber other end.When nitrogen dioxide existed, excited state perylene molecule and nitrogen dioxide molecules reacted, and produced fluorescent quenching, its result as shown in Figure 3, spectral line is followed successively by 10ppm from top to bottom, 20ppm, and the nitrogen dioxide of 50ppm and 100ppm is to the action response of perylene emitting fluorescence.When using, only get the fluorescence of 470nm wavelength as sensor.
Embodiment 2
As shown in Figure 2, a kind of fluorescent optical fiber sensor that detects nitrogen dioxide, it comprises excitation source 101, branch optical fiber 102, NO for open no pond sonde configuration
2Nano fluorescent film 201, the incident end of the light path of described excitation source 101 and branch optical fiber 102 is coupled, and the receiving end of branch optical fiber 102 and electrooptical device 103 are coupled, and total end end face arranged outside of branch optical fiber 102 has NO
2Nano fluorescent film 201.Described NO
2Nano fluorescent film 201 is coated on transparent carrier sheet 202 upper surfaces, is provided with optical filter 104 between the receiving end of branch optical fiber 102 and the electrooptical device 103.
Total end of described branch optical fiber 102 passes through optical coupler 105 fixed coupling in transparent carrier sheet 202 lower surfaces, with the NO that is coated on table on the transparent carrier sheet 202
2Nano fluorescent film 201 is corresponding.
Claims (7)
1. a fluorescent optical fiber sensor that detects nitrogen dioxide comprises excitation source (101), branch optical fiber (102), NO
2Nano fluorescent film (201), it is characterized in that: the incident end of the light path of described excitation source (101) and branch optical fiber (102) is coupled, the receiving end of branch optical fiber (102) and electrooptical device (103) are coupled, and total end end face arranged outside of branch optical fiber (102) has NO
2Nano fluorescent film (201).
2. according to the described sensor of claim 1, it is characterized in that: described NO
2Nano fluorescent film (201) is coated on transparent carrier sheet (202) upper surface, is provided with optical filter (104) between the receiving end of branch optical fiber (102) and the electrooptical device (103).
3. according to the described sensor of claim 2, it is characterized in that: total end of described branch optical fiber (102) passes through optical coupler (105) fixed coupling in transparent carrier sheet (202) lower surface, with the NO that is coated on transparent carrier sheet (202) upper surface
2Nano fluorescent film (201) is corresponding.
4. according to the described sensor of claim 2, it is characterized in that: the incident end of described branch optical fiber (102) is by optical coupler (105) and excitation source (101) fixed coupling, and the receiving end of branch optical fiber (102) is by optical coupler (105) and electrooptical device (103) fixed coupling; Total end of branch optical fiber (102) is fixed in the top of a detection cell (301) by optical coupler (105), and total end of branch optical fiber (102) stretches into detection cell (301), is coated on the NO on the transparent carrier sheet (202)
2Nano fluorescent film (201) place in the detection cell (301) and be positioned at branch optical fiber (102) always end face under, lower surface at transparent carrier sheet (202) is provided with catoptron (203), receives the fluorescence intensity of fiber end face to the total termination of branch optical fiber (102) with enhanced rad.
5. according to the described sensor of claim 4, it is characterized in that: described detection cell (301) is provided with sample gas inlet (303) and sample export (304); Be positioned between the optical coupler (105) at detection cell (301) top and the detection cell (301) by " O " circle (305) sealing.
6. according to the described sensor of claim 4, it is characterized in that: detection cell (301) is processed by opaque metal material or nonmetallic materials, and nonmetallic materials are polyetheretherketone or Teflon or Polyvinylchloride.
7. according to the described sensor of claim 1, it is characterized in that: described NO
2Nano fluorescent film (201) refers to be embedded with fluorescence probe perylene or Ti (Pc)
2The fluorescence sense film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810229876A CN101750403A (en) | 2008-12-17 | 2008-12-17 | Fluorescent optical fiber sensor for detecting nitrogen dioxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810229876A CN101750403A (en) | 2008-12-17 | 2008-12-17 | Fluorescent optical fiber sensor for detecting nitrogen dioxide |
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| CN101750403A true CN101750403A (en) | 2010-06-23 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445440A (en) * | 2010-10-09 | 2012-05-09 | 北京网新易尚科技有限公司 | Thin-layer fluorescent detector |
| CN103163110A (en) * | 2013-02-25 | 2013-06-19 | 东南大学 | Optical fiber gas array sensor and preparation method thereof |
| CN107132225A (en) * | 2016-02-29 | 2017-09-05 | 希森美康株式会社 | Blood clotting analytical equipment and blood clotting analysis method |
| CN107796795A (en) * | 2017-10-13 | 2018-03-13 | 福州大学 | Fluorescent optical sensor for gas detection |
| CN112924424A (en) * | 2021-01-21 | 2021-06-08 | 重庆大学 | Preparation method of fluorescent thin block and TATP optical fiber fluorescent probe for trace explosives |
-
2008
- 2008-12-17 CN CN200810229876A patent/CN101750403A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445440A (en) * | 2010-10-09 | 2012-05-09 | 北京网新易尚科技有限公司 | Thin-layer fluorescent detector |
| CN103163110A (en) * | 2013-02-25 | 2013-06-19 | 东南大学 | Optical fiber gas array sensor and preparation method thereof |
| CN107132225A (en) * | 2016-02-29 | 2017-09-05 | 希森美康株式会社 | Blood clotting analytical equipment and blood clotting analysis method |
| CN107132225B (en) * | 2016-02-29 | 2024-04-12 | 希森美康株式会社 | Blood coagulation analyzer and blood coagulation analysis method |
| CN107796795A (en) * | 2017-10-13 | 2018-03-13 | 福州大学 | Fluorescent optical sensor for gas detection |
| CN107796795B (en) * | 2017-10-13 | 2019-08-09 | 福州大学 | Fluorescent optical sensor for gas detection |
| CN112924424A (en) * | 2021-01-21 | 2021-06-08 | 重庆大学 | Preparation method of fluorescent thin block and TATP optical fiber fluorescent probe for trace explosives |
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Open date: 20100623 |