CN101587077A - Optical fibre sensor structure - Google Patents
Optical fibre sensor structure Download PDFInfo
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- CN101587077A CN101587077A CNA2009101121178A CN200910112117A CN101587077A CN 101587077 A CN101587077 A CN 101587077A CN A2009101121178 A CNA2009101121178 A CN A2009101121178A CN 200910112117 A CN200910112117 A CN 200910112117A CN 101587077 A CN101587077 A CN 101587077A
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- optical fibre
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Abstract
The invention relates to optical measurement field, particularly relates to optical fibre sensor structure, laser is inputted through optical fibre, evanescent wave generated in the optical fibre by laser excites peripheral gas or liquid materials to obtain fluorescence or Raman light, collecting the fluorescence or Raman light and proceeding frequency analysis and processing through a spectrometer to obtain a testing result. The optical fibre is disposed in capillary sleeve which is glued by three section of capillary sleeves, specifically includes a first capillary sleeve which is regular section of optical fibre in tube; a second capillary sleeve which is cone section of optical fibre in tube; a third capillary sleeve which is cone section of optical fibre in tube. The invention has technical advantages of removing effect of pump light to measuring light, implementing a optical fibre gas sensor or optical fibre liquid sensor with simple structure and test sensitivity.
Description
Technical field
The present invention relates to the optical measurement field, relate in particular to the evanescent wave that utilizes input laser in optical fiber, to produce and encourage gas or liquid substance in a kind of capillary pipe structure, fluorescence spectrum that obtains or Raman spectrum, utilize spectrometer to carry out spectrum analysis again, thereby realize optical fibre sensor structure that test gas or liquid substance are detected.
Background technology
Fiber gas sensor or fiber liquid sensor because have that electrical insulating property is good, anti-electromagnetic interference capability is strong, explosion-proof, can long-term at a distance on-line measurement, sensing unit is simple in structure, reliable and stable, be easy to form advantage such as optical fiber sensing network, be widely used in to various poisonous and harmful gas or liquid substances detection, atmospheric pollution and industrial gaseous waste, industrial waste waters monitoring and to the detection of food and habitation environment quality etc.
Fiber gas sensor or fiber liquid sensor comprise spectral absorption type, fluorescent type, dye indicator type, variations in refractive index type and evanescent wave type etc.The sensing measurement system of wherein spectral absorption type sensor is complicated, optical element is more, cost is higher, less stable; Dye indicator type sensor is subject to the chemical reaction velocity restriction, and to environment temperature and humidity sensitive, reversibility is poor; Variations in refractive index type sensor is subject to other gases affect and needs frequent adjustment, and its reliability and stability are relatively poor; The signal that the fluorescent type sensor does not usually make by force generation owing to pump light a little less than, thereby detection system complexity, system cost is higher; Evanescent wave type sensor has advantages such as structural design is simple, cost is lower, but has the not high shortcoming of sensitivity equally.
Summary of the invention
At the deficiency of above-mentioned each fiber gas sensor or fiber liquid sensor, the present invention proposes a kind of combined with fluorescent type, raman type and evanescent wave type principle and makes fiber gas sensor or fiber liquid sensor.
Technical scheme of the present invention is:
Optical fibre sensor structure of the present invention, by optical fiber input laser, the evanescent wave that laser produces in optical fiber encourages its peripheral gas or liquid substance, fluorescence that obtains or Raman light, collect described fluorescence or Raman light, carry out spectrum analysis and processing by spectrometer again, obtain testing result.Described optical fiber is arranged in the capillary pipe box, and described capillary pipe box is formed together by 3 sections capillary pipe box gummeds, specifically comprises:
The first capillary pipe box (102A) is the conventional section (101A) of optical fiber in its pipe;
The second capillary pipe box (102B) is the tapered segment (101B) of optical fiber in its pipe;
Three capillary cover (102C) is the tapered segment (101C) of optical fiber in its pipe.
Further, the gummed place of the described first capillary pipe box (102A) and the second capillary pipe box (102B) is provided with an introduction channel (104), and the gummed place of described first capillary pipe box (102A) and three capillary cover (102C) is provided with one and derives passage (105).
Further, gas or liquid substance by constantly circulating in the pipeline configuration that described introduction channel (104), first capillary pipe box (102A) internal channel and derivation passage (105) form are realized flow detection gas or liquid substance.
Perhaps, after feeding gas or liquid substance in the pipeline configuration that described introduction channel (104), first capillary pipe box (102A) internal channel and derivation passage (105) form, the inlet seal plug (1041) of closed introduction channel (104) and the exit seal plug (1051) of deriving passage (105), thus a closed pipeline structure formed.Seal fluid and gas are realized detected gas or liquid substance as the spectroscopic standard body.
Further, the gap filling with sealant (103) of the tapered segment (101B) of the optical fiber in the described second capillary pipe box (102B) and its pipe, the gap filling with sealant (103) of the tapered segment (101C) of the optical fiber in described three capillary cover (102C) and its pipe.Prevent that fluid to be measured or gas from leaking from the second capillary pipe box (102B) or three capillary cover (102C) end.
The embodiment of expansion, described three capillary cover (102C) is formed by capillary pipe box (102C1, the 102C2) gummed of 2 angular cuts, described cemented surface plating reflectance coating (S2).In this embodiment, derive passage (105) and can be arranged at two gummed inclined-planes.
The peripheral plating of the pipeline of the described first capillary pipe box (102A) reflectance coating (S1).With the fluorescence that produces or Raman light limit propagation pipe interior at the first capillary pipe box, realize that end face collects, can be used for measuring the liquid that refractive index is higher than optical fiber.
Preferred embodiment, described fluorescence or Raman light (106) are also assembled by optical convergence's element (107) and are collected, and reenter and inject Transmission Fibers (108) to described spectrometer.
But technological merit of the present invention is the cancellation pump light measuring light is influenced, realize a kind of detect again sensitive fiber gas sensor or fiber liquid sensor simple in structure.
Description of drawings
Fig. 1 is the structural representation of embodiments of the invention one;
Fig. 2 is the structural representation of embodiments of the invention two;
Fig. 3 is the structural representation of embodiments of the invention three;
Fig. 4 is the structural representation of embodiments of the invention four.
Embodiment
Now the present invention is further described with embodiment in conjunction with the accompanying drawings.
Optical fibre sensor structure of the present invention, by optical fiber input laser, the evanescent wave that laser produces in optical fiber encourages its peripheral gas or liquid substance, fluorescence that obtains or Raman light, collect described fluorescence or Raman light, carry out spectrum analysis and processing by spectrometer again, obtain testing result.
Consult embodiment shown in Figure 1, wherein 101A is the conventional section of optical fiber, 101B, 101C are the tapered segment of optical fiber, 102A, 102B, 102C are three sections optical fiber capillary pipe boxes, 104,105 be respectively introduction channel and derive passage, 103 are tapered segment 101B, the 101C of bonding filling optical fiber and the glue of optical fiber capillary pipe box 102B, 102C, and 106 is fluorescence or the Raman light that produces by fast travelling waves of optical fibre.Because the conventional section 101A of optical fiber can form one section very thin optical fiber in optical fiber capillary pipe box 102A, thereby can produce very light laser light intensity at the conventional section 101A of optical fiber and the conventional section 101A surface of optical fiber.The conventional section 101A of optical fiber, the tapered segment 101B of optical fiber, the tapered segment 101C of optical fiber, optical fiber capillary pipe box 102A, 102B, 102C are integral by adhesive bond, and gas to be measured or liquid can enter optical fiber capillary pipe box 102A and be produced fluorescence or Raman light 106 by laser excitation from introduction channel 104.
Because optical fiber capillary pipe box 102A has than high permeability fluorescence or the Raman light that produces, thereby fluorescence or Raman light that the conventional section 101A of optical fiber produces can be received from the side, and can be used for the slit spectral measurement.
Shown in Figure 2 is expansion embodiment of the present invention, and wherein, by optical fiber kapillary 102A, optical fiber kapillary 102B, optical fiber kapillary 102C1,102C2 that the optical fiber kapillary 102C among Fig. 1 expands to the band angular cut form.Wherein the S2 face is the high-reflecting film layer, is the otch cemented surface of optical fiber kapillary 102C1,102C2.Thereby optical fiber kapillary 102A inside surface S1 is coated with metallic reflective coating or diffusive reflective film and forms optical waveguide or diffuse-reflective cavity here, propagates along optical fiber kapillary 102A inwall from fluorescence or Raman light that the conventional section 101A of optical fiber produces.104,105 be respectively introduction channel and derive passage.After feeding gas or liquid substance, the inlet seal plug 1041 of closed introduction channel 104 and the exit seal plug 1051 of deriving path 10 5, thus form a closed pipeline structure.When optical fiber kapillary 102B is ceramic material, then can in optical fiber kapillary 102B, form diffuse-reflective cavity.Wherein a part of light is assembled by optical convergence's element 107 by the fluorescence of S2 surface reflection or Raman light 106 and is collected, and reenters to inject Transmission Fibers 108 to described spectrometer and carry out analyzing and processing.Adopt this structure can improve the fluorescence or the Raman light intensity of collection greatly.
The principle of the embodiment three of Fig. 3 and the embodiment two of Fig. 2 are similar, and can be used for the test liquid sample.Wherein 104,105 be respectively inlet and liquid outlet, nF is an optical fibre refractivity, and ng is kapillary glass (or plastics) refractive index, and nL is a liquid refractivity, and nF＞nL＞ng produces waveguide in kapillary, and a part of fluorescence or Raman 106 light reflect along the wave guide direction transmission and by the S2 face; Another part fluorescence or Raman 106 can be collected in optical fiber capillary pipe box 102A side, and fluorescence or Raman light 106 are all assembled collections by optical convergence's element 107, reenter to inject Transmission Fibers 108 to described spectrometer and carry out analyzing and processing.
The structural principle of the embodiment four of Fig. 4 is also similar with the embodiment two of Fig. 2, plating reflectance coating or diffusive reflective film S3 outside optical fiber kapillary 102A pipe, with the fluorescence that produces or Raman light 106 limit propagation in optical fiber kapillary 102A inside, the realization end face is collected, fluorescence or Raman light 106 are assembled by optical convergence's element 107 and are collected, reenter and inject Transmission Fibers 108 to described spectrometer and carry out analyzing and processing, can be used for measuring the liquid that refractive index is higher than optical fiber.
The salable liquids and gases of the present invention also can be by gas, the liquid substance of circulation as the spectroscopic standard body.But advantage cancellation pump light of the present invention influences measuring light, because pumping is exported from optical fiber.The present invention can adopt multi-wavelength light to enter pumping, also can import laser by tunable laser.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present invention that do not break away from appended claims and limited; can make various variations to the present invention in the form and details, be protection scope of the present invention.
Claims (10)
1. optical fibre sensor structure, by optical fiber input laser, the evanescent wave that laser produces in optical fiber encourages its peripheral gas or liquid substance, and fluorescence that obtains or Raman light (106) are collected described fluorescence or Raman light (106), carry out spectrum analysis and processing by spectrometer again, obtain testing result, it is characterized in that described optical fiber is arranged in the capillary pipe box, described capillary pipe box is formed together by 3 sections capillary pipe box gummeds, specifically comprises:
The first capillary pipe box (102A) is the conventional section (101A) of optical fiber in its pipe;
The second capillary pipe box (102B) is the tapered segment (101B) of optical fiber in its pipe;
Three capillary cover (102C) is the tapered segment (101C) of optical fiber in its pipe.
2. optical fibre sensor structure according to claim 1, it is characterized in that: the gummed place of the described first capillary pipe box (102A) and the second capillary pipe box (102B) is provided with an introduction channel (104), and the gummed place of described first capillary pipe box (102A) and three capillary cover (102C) is provided with one and derives passage (105).
3. optical fibre sensor structure according to claim 1 and 2 is characterized in that: gas or liquid substance by constantly circulating in the pipeline configuration that described introduction channel (104), first capillary pipe box (102A) internal channel and derivation passage (105) form.
4. optical fibre sensor structure according to claim 1 and 2, it is characterized in that: after feeding gas or liquid substance in the pipeline configuration that described introduction channel (104), first capillary pipe box (102A) internal channel and derivation passage (105) form, the inlet seal plug (1041) of closed introduction channel (104) and the exit seal plug (1051) of deriving passage (105), thus a closed pipeline structure formed.
5. optical fibre sensor structure according to claim 1 and 2, it is characterized in that: the gap filling with sealant (103) of the tapered segment (101B) of the optical fiber in the described second capillary pipe box (102B) and its pipe, the gap filling with sealant (103) of the tapered segment (101C) of the optical fiber in described three capillary cover (102C) and its pipe.
6. optical fibre sensor structure according to claim 1 is characterized in that: described three capillary cover (102C) is formed by capillary pipe box (102C1, the 102C2) gummed of 2 angular cuts, described cemented surface plating reflectance coating (S2).
7. optical fibre sensor structure according to claim 1 and 2 is characterized in that: the peripheral plating of the pipeline of the described first capillary pipe box (102A) reflectance coating (S1).
8. optical fibre sensor structure according to claim 3 is characterized in that: the peripheral plating of the pipeline of the described first capillary pipe box (102A) reflectance coating (S1).
9. optical fibre sensor structure according to claim 4 is characterized in that: the peripheral plating of the pipeline of the described first capillary pipe box (102A) reflectance coating (S1).
10. optical fibre sensor structure according to claim 1 is characterized in that: described fluorescence or Raman light (106) are also assembled by optical convergence's element (107) and are collected, and reenter and inject Transmission Fibers (108) to described spectrometer.
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| CN2009101121178A CN101587077B (en) | 2009-06-24 | 2009-06-24 | Optical fibre sensor structure |
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| CN2009101121178A CN101587077B (en) | 2009-06-24 | 2009-06-24 | Optical fibre sensor structure |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900682A (en) * | 2010-03-11 | 2010-12-01 | 哈尔滨工程大学 | Inner-wall waveguide mode capillary fiber based online evanescent field biosensor |
| CN103454239A (en) * | 2012-06-01 | 2013-12-18 | 株式会社电装 | Liquid component sensor |
| CN104155286A (en) * | 2014-08-29 | 2014-11-19 | 四川九高科技有限公司 | Spectrum generator |
| CN104266972A (en) * | 2014-10-08 | 2015-01-07 | 东北大学 | Method for manufacturing optical fiber type liquid refractive index detection tank |
| CN104350377A (en) * | 2012-07-29 | 2015-02-11 | 惠普发展公司，有限责任合伙企业 | Scattering spectroscopy nanosensor |
| CN104405613A (en) * | 2014-11-28 | 2015-03-11 | 广东工业大学 | Laser-induced micro pump |
| CN105022004A (en) * | 2015-07-07 | 2015-11-04 | 华南师范大学 | Waveguide magnetic field/current sensor based on surface plasmons and device |
| CN105424604A (en) * | 2015-10-02 | 2016-03-23 | 黄辉 | Sensor based on sleeved waveguide tube |
| CN106290305A (en) * | 2016-10-26 | 2017-01-04 | 中国计量大学 | Raman scattering substrate is strengthened based on optical fiber evanescent field auxiliary surface |
| CN107796795A (en) * | 2017-10-13 | 2018-03-13 | 福州大学 | Fluorescent optical sensor for gas detection |
| CN110260256A (en) * | 2019-05-29 | 2019-09-20 | 深圳市星汉激光科技有限公司 | A kind of white light laser source |
-
2009
- 2009-06-24 CN CN2009101121178A patent/CN101587077B/en active Active
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900682B (en) * | 2010-03-11 | 2012-02-01 | 哈尔滨工程大学 | Inner-wall waveguide mode capillary fiber based online evanescent field biosensor |
| CN101900682A (en) * | 2010-03-11 | 2010-12-01 | 哈尔滨工程大学 | Inner-wall waveguide mode capillary fiber based online evanescent field biosensor |
| CN103454239B (en) * | 2012-06-01 | 2016-11-23 | 株式会社电装 | Liquid component sensor |
| CN103454239A (en) * | 2012-06-01 | 2013-12-18 | 株式会社电装 | Liquid component sensor |
| CN104350377A (en) * | 2012-07-29 | 2015-02-11 | 惠普发展公司，有限责任合伙企业 | Scattering spectroscopy nanosensor |
| US9389186B2 (en) | 2012-07-29 | 2016-07-12 | Hewlett-Packard Development Company, L.P. | Scattering spectroscopy nano sensor |
| CN104155286A (en) * | 2014-08-29 | 2014-11-19 | 四川九高科技有限公司 | Spectrum generator |
| CN104266972A (en) * | 2014-10-08 | 2015-01-07 | 东北大学 | Method for manufacturing optical fiber type liquid refractive index detection tank |
| CN104405613A (en) * | 2014-11-28 | 2015-03-11 | 广东工业大学 | Laser-induced micro pump |
| CN105022004A (en) * | 2015-07-07 | 2015-11-04 | 华南师范大学 | Waveguide magnetic field/current sensor based on surface plasmons and device |
| CN105424604A (en) * | 2015-10-02 | 2016-03-23 | 黄辉 | Sensor based on sleeved waveguide tube |
| CN105424604B (en) * | 2015-10-02 | 2018-10-23 | 黄辉 | A kind of sensor based on nested waveguide |
| CN106290305A (en) * | 2016-10-26 | 2017-01-04 | 中国计量大学 | Raman scattering substrate is strengthened based on optical fiber evanescent field auxiliary surface |
| 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 |
| CN110260256A (en) * | 2019-05-29 | 2019-09-20 | 深圳市星汉激光科技有限公司 | A kind of white light laser source |
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| CN101587077B (en) | 2011-06-01 |
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