CN1558209A - Coupled type monomode fiber fadeout wave sensor - Google Patents
Coupled type monomode fiber fadeout wave sensor Download PDFInfo
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- CN1558209A CN1558209A CNA2004100162553A CN200410016255A CN1558209A CN 1558209 A CN1558209 A CN 1558209A CN A2004100162553 A CNA2004100162553 A CN A2004100162553A CN 200410016255 A CN200410016255 A CN 200410016255A CN 1558209 A CN1558209 A CN 1558209A
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Abstract
The present invention is one coupled high-sensitivity single-mode fiber evanescent wave sensor, and belongs to the field of optical fiber and sensor technology. The sensor consists of mainly light source, optical fiber, fiber evanescent wave sensor element, detector, signal processing unit and container holding measured medium. It features the single-mode fiber; the melting cone type single-mode fiber coupler probe as the fiber evanescent wave sensor element; the basal body with the packed melting cone type single-mode fiber coupler probe, sensing single-mode fiber cone area, single-mode fiber lead-in ends and fixing glue to fix the fiber; the hollow channel for tested gas or liquid to be led in; and the container holding measured medium. The present invention has simple structure, high sensitivity, high selectivity of lowest measurement limit in ppb to ppm level, and other advantages
Description
Technical field:
The present invention addresses a kind of novel manifold type single-mode fiber evanescent wave sensor, belongs to optical fiber and sensor technical field.
Background technology:
Optical fiber evanescent wave sensing technology is by the evanescent wave that appears fibre-optic waveguide and the interaction of measured object, the interior transmission of optical fiber light intensity, phase place or frequency are changed, measure these variations, thereby obtain measured object concentration, refractive index, the isoparametric method of pH value.When being applied to fields such as environment, biology, chemistry, because of parameters such as the content of material that will test, variations in refractive index very small, as drinking water quality measurement, DNA measurement, biological immune measurement etc.How to improve optical fiber evanescent wave sensor sensitivity, reduce noise, make test macro have high resolving power, satisfy trace test and just become a problem that urgency is to be solved.At present, many researchers do a lot of work from sensing principle, sensing head mode and three aspects of sensor fibre, and have obtained certain achievement for addressing this problem.
Aspect sensing principle, the absorption optical fiber evanescent wave sensor of realizing with principle of absorption is the most basic evanescent wave sensing form, also is the most direct a kind of measuring method.It utilizes the attenuated total reflection characteristic of optical fiber, and evanescent wave and absorbing medium are interacted, and detects its light intensity and changes.It is simple in structure, convenient test, be easy to use, but sensitivity lower (general water quality and some liquid can at 100ppb), and, be subject to light source and Effect of Environmental because of Direct-detection Optical is strong.In order to improve measurement sensitivity, fluorescence formula evanescent wave sensor has just appearred, and this is a kind of mark measuring method, and its sensitivity will be higher than 2～4 orders of magnitude of absorption evanescent wave sensor.Yet, only there is 20～30% the measured matter can autofluorescence, most of fluorescence formula test macros also need to add some indicator (as the orange fluorescein of pyridine, Beta-methyl-San shape ketone, neutral bifurcation pyridine etc.) just can carry out assay determination, after these indicator are excited by evanescent wave, fluorescence can directly be sent and detected.Fluorescence method is because a little less than the fluorescence signal, so need highly sensitive detecting instrument, the adding of indicator simultaneously also can be disturbed the receptivity and the accuracy of measurement of measured object molecule.
Aspect the sensing head form, three kinds of at present main D shape optical fiber, naked core optical fiber and conical fibers.
Aspect sensor fibre, the evanescent wave sensor adopts multimode optical fiber more at present.
Researchers adopt diverse ways to remove to improve sensitivity, the reducing noise of optical fiber evanescent wave sensor, and have spent great amount of manpower and material resources around this theme.Yet up to the present, the high sensitivity evanescent wave sensor multiparameter on-line measurement of unmarked (no fluorescence) still is a difficult problem that does not have solution.
Summary of the invention
At this problem, this patent has proposed based on the optical fiber coupling principle, a kind of single-mode fiber evanescent wave sensor that utilizes fiber coupler to realize.The object of the present invention is to provide a kind of highly sensitive melting cone type manifold type single-mode fiber evanescent wave sensor.
A kind of manifold type single-mode fiber evanescent wave sensor of the present invention, main by light source, optical fiber, optical fiber evanescent wave sensing element, detector, signal processing unit and fill by the container of side medium and form; It is characterized in that the fine little single-mode fiber that is of optics; Optical fiber evanescent wave sensing element is melting cone type single-mode optical-fibre coupler probe; This melting cone type single-mode optical-fibre coupler probe is packaged in the matrix, and the single-mode fiber awl district of a sensing is arranged in the matrix, and respectively there is the single-mode fiber leading-in end of a sensing with single-mode optical-fibre coupler at two ends, and it is fixed on the matrix optical fiber by fixing glue; Near the optical taper district, also leave the hollow turnover groove that tested gas or liquid is passed through and surround the optical taper district; Melting cone type single-mode optical-fibre coupler probe or sensing element are positioned in the container that fills measured medium, and are surrounded by measured medium.
The minimum diameter in the sensing polarization maintaining optical fibre awl district in the above-mentioned matrix is 3-7 times of fibre core.
Principle of the present invention is: utilize the coupling of two optical fiber, the evanescent wave in coupling mechanism awl district is interacted with the measured medium that surrounds the awl district, the variation of measured medium will be reacted to the splitting ratio of coupling mechanism output terminal very sensitively like this, relating to parameters such as the length in this splitting ratio and pyrometric cone district, wavelength, pyrometric cone district surrounding medium are as long as detect the purpose that its result can realize detecting each parameter.
Adopt single-mode fiber among the present invention, because multimode optical fiber pattern in transmission and sensing process interacts, modal noise can occur, detector can't be differentiated these noises and measured signal; And single-mode fiber can not produce above-mentioned problem, and single-mode fiber only has the basic mode transmission, does not have modal noise to exist.Under the equivalent coupled power, single-mode fiber is than multimode optical fiber average electric field height on optical fiber surface in addition, so single mode has higher sensing efficient than multimode evanescent wave sensor.
The present invention adopts the melting cone type single-mode fiber, and good pyrometric cone technology can guarantee the making of conical fiber, and the guided wave that draws when boring to a certain degree (as fibre diameter near fibre core) to have greater than 90% when optical fiber is transformed into evanescent wave.
Manifold type single-mode fiber evanescent wave sensor of the present invention has the following advantages: (1) is highly sensitive, and what its was measured based on the evanescent wave sensor of coupling principle is not to absorb light intensity, but the splitting ratio of coupling mechanism.It has the sensitivity of interferometer, than absorption highly sensitive, can compare favourably with the sensitivity of fluorescence formula; The fusion coupling of (2) two optical fiber, the useful effect face than single conical fiber is big in form in sensing, so efficient height, the sensitivity of sensing are big.In addition, its awl district is also than the length of single conical fiber; (3) can determine different pyrometric cone length according to different requirements and measurement range, can obtain different sensitivity; (4) output signal is a splitting ratio, and signal output changes with light intensity and noise has nothing to do.
Sensor construction of the present invention is simple, highly sensitive, antijamming capability is strong, detects, need not sampled measurements in real time, is convenient to advantages such as networking, and its minimum survey limit reaches the ppb-ppm level.
Description of drawings
Fig. 1 is a gradually formula wave sensor schematic diagram of manifold type single-mode fiber of the present invention
Among the figure: 1-light source; 2-single-mode fiber, 3-sensing are popped one's head in single-mode optical-fibre coupler; 4,5---detector, 6-signal processing unit; 7-container; 8-measured medium
Fig. 2 is the encapsulation synoptic diagram of single-mode optical-fibre coupler probe
Among the figure: the single-mode fiber leading-in end of the single-mode optical-fibre coupler that 31-sensing is used; 32-matrix; 33-fixing glue; The single-mode fiber awl district of 34-sensing; The hollow turnover groove of 35-tested gas or liquid.
Embodiment
Now in conjunction with the accompanying drawings and embodiments, the present invention further is described in after
Embodiment one: referring to Fig. 1 and Fig. 2, a kind of manifold type single-mode fiber evanescent wave sensor of the present invention, main by light source 1, optical fiber 2, optical fiber evanescent wave sensing element 3, detector 4,5, signal processing unit 6 and fill by the container 7 of side medium 8 and form; It is characterized in that optical fiber 2 is single-mode fiber; Optical fiber evanescent wave sensing element 3 is melting cone type single-mode optical-fibre coupler probe; This melting cone type single-mode optical-fibre coupler probe 3 is packaged in the matrix 32, the single-mode fiber awl district 34 that one sensing is arranged in the matrix 32, respectively there is the single-mode fiber leading-in end 31 of a sensing with single-mode optical-fibre coupler at two ends, and it is fixed on the matrix 32 optical fiber 31 by fixing glue 33; Near optical taper district 34, also leave the hollow turnover groove 35 that tested gas or liquid is passed through and surround optical taper district 34; Melting cone type single-mode optical-fibre coupler probe or sensing element 3 are positioned in the container 7 that fills measured medium 8, and are surrounded by measured medium.
The minimum diameter in the sensing polarization maintaining optical fibre awl district 34 in the above-mentioned matrix 32 is 3-7 a times of fibre core.
Concrete operations principle and process prescription are as follows: utilize and the corresponding light source 1 of measured matter absorbing wavelength (as LED, LD etc.), enter sensing by single-mode fiber 2 and pop one's head in 3 with single-mode optical-fibre coupler, the measured medium 8 that sensing unit 3 has container 7 to contain surrounds, the evanescent wave of measured medium and sensing element 3 interacts, changed the light intensity that is transferred to detector 4 and 5, both change the splitting ratio of single-mode optical-fibre coupler, become content (or concentration) information that electric signal entering signal processing unit 6 can obtain fluid to be measured or gas medium through opto-electronic conversion then.
In concrete manufacturing process, adopting the oxyhydrogen flame lamp is the low baking temperature torch, in order to reduce stress and to keep high polarization state to need long preheating time; Adopt the slow relatively awl speed of drawing; Draw the length of awl to want the sensitivity of view sensor and decide, the general minimum diameter of selecting the awl district is that 3-7 times of fibre core get final product.Adopt the rotatable modified fused conic clinker of anchor clamps to make the sensing single-mode optical-fibre coupler in addition, can select pitch is 3-5mm.
In order to reduce the influence of temperature to sensor, the sensing probe fit on adopts the material close with the fiber optic materials temperature characterisitic, as quartz.In addition, the material of negative temperature coefficient also can compensate temperature variation in the practical application as the substrate of sensor head.Adopt two the non-awl ends and the substrate of the little glue bond coupling mechanism of temperature effect, solidify glue as secondary UV.
High sensitivity, high selectivity that sensor of the present invention is fit to gas or liquid substance are measured, and can be applicable to the trace element identification, extraction, evaluation in fields such as biology, chemistry, medicine, environment etc.
Claims (2)
1. manifold type single-mode fiber evanescent wave sensor is mainly by light source (1), optical fiber (2), optical fiber evanescent wave sensing element (3), detector (4,5), signal processing unit (6) and fill by the container of side medium (8) (7) and form; It is characterized in that optics fibre little (2) is a single-mode fiber; Optical fiber evanescent wave sensing element (3) is melting cone type single-mode optical-fibre coupler probe; This melting cone type single-mode optical-fibre coupler probe (3) is packaged in the matrix (32), the single-mode fiber awl district (34) that one sensing is arranged in the matrix (32), respectively there is the single-mode fiber leading-in end (31) of a sensing with single-mode optical-fibre coupler at two ends, and it is fixed on the matrix (32) optical fiber (31) by fixing glue (33); Near optical taper district (34), also leave the hollow turnover groove (35) that tested gas or liquid is passed through and surround optical taper district (34); Melting cone type single-mode optical-fibre coupler probe or sensing element (3) are positioned in the container (7) that fills measured medium (8), and are surrounded by measured medium.
2. a kind of manifold type single-mode fiber evanescent wave sensor according to claim 1, the minimum diameter that it is characterized in that the sensing polarization maintaining optical fibre awl district (34) in the described matrix (32) are 3-7 times of fibre core.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410016255 CN1258678C (en) | 2004-02-12 | 2004-02-12 | Coupled type monomode fiber fadeout wave sensor |
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| CN 200410016255 CN1258678C (en) | 2004-02-12 | 2004-02-12 | Coupled type monomode fiber fadeout wave sensor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297843A (en) * | 2010-06-23 | 2011-12-28 | 中国科学院微电子研究所 | Evanescent-wave optical sensing testing system applied to total phosphorus detection and method thereof |
| CN102735368A (en) * | 2011-04-13 | 2012-10-17 | 上海大学 | Tapered optical fiber temperature sensor and sensing probe manufacture method thereof |
| CN103439262A (en) * | 2013-07-16 | 2013-12-11 | 深圳大学 | Volatile organic compound detection device based on optical fiber evanescent field and manufacturing method thereof |
| CN104568883A (en) * | 2014-12-31 | 2015-04-29 | 中国科学院深圳先进技术研究院 | Fiber coupling total internal reflection fluorescence microscopic imaging chip |
| CN105115939A (en) * | 2015-07-28 | 2015-12-02 | 重庆大学 | Tapered multimode interference-based high-sensitivity optical fiber methane sensing device |
| CN106706111A (en) * | 2017-01-13 | 2017-05-24 | 国网上海市电力公司 | Acoustic emission sensor and acoustic emission signal detecting method |
| CN106706562A (en) * | 2017-01-12 | 2017-05-24 | 天津大学 | All-optical-fiber based gas-liquid mixed measurement device and remote gas-liquid mixed measurement system |
| CN108225605A (en) * | 2018-02-07 | 2018-06-29 | 西安交通大学 | A kind of D-shaped polymer optical fiber probe, temperature sensor and preparation method |
| CN110160960A (en) * | 2019-06-22 | 2019-08-23 | 南昌航空大学 | Micro-nano fiber biosensor and preparation method thereof based on coupler structure |
| CN110864742A (en) * | 2019-12-02 | 2020-03-06 | 中国人民解放军国防科技大学 | All-fiber temperature and salt depth sensor based on micro-nano fiber coupler interferometer |
| CN111908777A (en) * | 2020-07-06 | 2020-11-10 | 广州宏晟光电科技股份有限公司 | Substrate applied to optical device and preparation method thereof |
-
2004
- 2004-02-12 CN CN 200410016255 patent/CN1258678C/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102297843A (en) * | 2010-06-23 | 2011-12-28 | 中国科学院微电子研究所 | Evanescent-wave optical sensing testing system applied to total phosphorus detection and method thereof |
| CN102297843B (en) * | 2010-06-23 | 2013-08-28 | 中国科学院微电子研究所 | Evanescent-wave optical sensing testing system applied to total phosphorus detection and method thereof |
| CN102735368A (en) * | 2011-04-13 | 2012-10-17 | 上海大学 | Tapered optical fiber temperature sensor and sensing probe manufacture method thereof |
| CN103439262A (en) * | 2013-07-16 | 2013-12-11 | 深圳大学 | Volatile organic compound detection device based on optical fiber evanescent field and manufacturing method thereof |
| CN104568883A (en) * | 2014-12-31 | 2015-04-29 | 中国科学院深圳先进技术研究院 | Fiber coupling total internal reflection fluorescence microscopic imaging chip |
| CN104568883B (en) * | 2014-12-31 | 2018-02-23 | 中国科学院深圳先进技术研究院 | A kind of total internal reflection fluorescent micro-imaging chip of fiber coupling |
| CN105115939B (en) * | 2015-07-28 | 2017-11-28 | 重庆大学 | A kind of high sensitivity optical fiber methane sensing device based on tapered multimode interference |
| CN105115939A (en) * | 2015-07-28 | 2015-12-02 | 重庆大学 | Tapered multimode interference-based high-sensitivity optical fiber methane sensing device |
| CN106706562A (en) * | 2017-01-12 | 2017-05-24 | 天津大学 | All-optical-fiber based gas-liquid mixed measurement device and remote gas-liquid mixed measurement system |
| CN106706111A (en) * | 2017-01-13 | 2017-05-24 | 国网上海市电力公司 | Acoustic emission sensor and acoustic emission signal detecting method |
| CN106706111B (en) * | 2017-01-13 | 2020-04-10 | 国网上海市电力公司 | Acoustic emission sensor and acoustic emission signal detection method |
| CN108225605A (en) * | 2018-02-07 | 2018-06-29 | 西安交通大学 | A kind of D-shaped polymer optical fiber probe, temperature sensor and preparation method |
| CN110160960A (en) * | 2019-06-22 | 2019-08-23 | 南昌航空大学 | Micro-nano fiber biosensor and preparation method thereof based on coupler structure |
| CN110864742A (en) * | 2019-12-02 | 2020-03-06 | 中国人民解放军国防科技大学 | All-fiber temperature and salt depth sensor based on micro-nano fiber coupler interferometer |
| CN110864742B (en) * | 2019-12-02 | 2021-11-12 | 中国人民解放军国防科技大学 | All-fiber temperature and salt depth sensor based on micro-nano fiber coupler interferometer |
| CN111908777A (en) * | 2020-07-06 | 2020-11-10 | 广州宏晟光电科技股份有限公司 | Substrate applied to optical device and preparation method thereof |
| CN111908777B (en) * | 2020-07-06 | 2022-05-24 | 广州宏晟光电科技股份有限公司 | Substrate applied to optical device and preparation method thereof |
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| CN1258678C (en) | 2006-06-07 |
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