CN104251848A - Fluorescence method optical fiber sensor - Google Patents
Fluorescence method optical fiber sensor Download PDFInfo
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- CN104251848A CN104251848A CN201310266522.1A CN201310266522A CN104251848A CN 104251848 A CN104251848 A CN 104251848A CN 201310266522 A CN201310266522 A CN 201310266522A CN 104251848 A CN104251848 A CN 104251848A
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- fluorescence
- fiber coupler
- inductive material
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- optical sensor
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Abstract
The utility model relates to a fluorescence method optical fiber sensor. The fluorescence method optical fiber sensor comprises a light source, a coupling lens, a fiber coupler, a fluorescence induction material and a photoelectric detector, wherein light emitted by the light source is coupled to the input end of the fiber coupler through the coupling lens, the fluorescence induction material is directly arranged on a first output terminal transverse plane of the fiber coupler, the light output by the first output transverse plane of the fiber coupler irradiates on the fluorescence induction material, the emitted fluorescence output at the second output terminal transverse plane of the fiber coupler, and is received by the photoelectric detector, and the physical or chemical parameters such as the concentration of a material acting on the fluorescence induction material can be detected by determining the intensity of the received fluorescence. The first output terminal transverse plane of the fiber coupler can be a plane, or an inclined plane, or an arced plane, or other shapes.
Description
Technical field
The invention belongs to photoelectric sensing field, particularly a kind of different material that utilizes is to the influential effect of fluorescence spectrum, and adopts optical fiber to realize the fluorescence method Fibre Optical Sensor instrument detected physics or the chemical property of material as light signal medium.
Background technology
Fluorescence method sensing principle is identifying that the molecule of some detected parameters connects together the fluorescence inductive material formed for sensing by chemical method with one by fluorescigenic molecule.Usually fluorescence inductive material is coated on a transparent material, the light source with one with certain bandwidth makes it produce certain fluorescence through transparent material deexcitation fluorescence inductive material, when detected material is present in detected sample, by detected material and identification interaction of molecules, cause cancellation or the enhancing of fluorescence.Fluorescence intensity is just relevant with the concentration of measured matter.The content of measured matter just can be calculated by measuring fluorescence intensity.Due to the development of modern optical fiber technology, the loss of light transmission is in a fiber reduced greatly, therefore, adopt optical fiber to carry out transmission sensing light signal and can realize remote sensing detection.In addition, optical fiber also has volume little, lightweight, and light signal is not by electromagnetic interference (EMI), and the advantages such as corrosion-resistant and high temperature, therefore, are specially adapted to the sensing detection in crawl space and rugged surroundings.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, adopt a kind of fiber coupler and fluorescence inductive material is set directly on the surface of an output terminal optical fiber of fiber coupler, make the structure of sensor apparatus simple, the size of sensing head is little, is specially adapted to the sensing detection of crawl space.The output end face of described fiber coupler is arranged to plane or inclined-plane or arc or other shapes in order to the transport property of the photosensitive area and exciting light that change fluorescence inductive material and the transport property of fluorescence fiber coupler that produce from fluorescence inductive material, thus improves the performance of sensor apparatus.Due to the low-loss feature of optical fiber, remote sensing detection can be realized.
The present invention solves its technical matters and realizes by the following technical solutions:
A kind of fluorescence method Fibre Optical Sensor instrument, comprise excitation source, coupled lens, fiber coupler, fluorescence inductive material, photodetector, the light that described excitation source sends is coupled to the input end of described fiber coupler by described coupled lens, described fluorescence inductive material is set directly on the first output end face of described fiber coupler, the illumination that described fiber coupler first output terminal exports is mapped on described fluorescence inductive material, the fluorescence sent exports at the second output terminal of described fiber coupler, and by described photoelectric detector, physics or the chemical parameters such as the concentration of the material acted on described fluorescence inductive material can be detected by the power measuring received fluorescence.First output end face of described fiber coupler can be plane or inclined-plane or disc or other shapes.
And excitation source is a kind of LED light source of broadband or the LASER Light Source of arrowband.
And the wavelength of fluorescence that the centre wavelength of described excitation source sends than fluorescence inductive material is short.
And described fiber coupler can be single-mode optical-fibre coupler or multi-module optical fiber coupler, and there are three ports, comprise an input port, two output ports.
And described fluorescence inductive material is set directly on the fiber end face of the first output terminal of described fiber coupler.
And the fluorescence spectrum that described photodetector sends with described fluorescence inductive material has substantially identical spectral range.
Advantage of the present invention and beneficial effect are:
1. adopt a kind of fiber coupler and be set directly on an output end face of fiber coupler by fluorescence inductive material, make the structure of sensor apparatus simple, the size of sensing head is little, is specially adapted to the sensing detection of crawl space.
2. this fluorescence method Fibre Optical Sensor instrument, simple for structure, and size is little, reasonable in design, and cost is low.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of fiber coupler;
Fig. 2 is schematic diagram of the present invention;
Fig. 3 is three kinds of difformities of an output end face of fiber coupler;
Fig. 4 is the output spectrum schematic diagram of excitation source;
The fluorescence spectrum schematic diagram that Fig. 5 sends for fluorescence inductive material.
Embodiment
Be described in further detail the present invention below in conjunction with accompanying drawing, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
Fig. 1 is the schematic diagram of fiber coupler.Fiber coupler 100 has three ports, input port 10, output port 14, with output port 12. in an application of the invention, what the excitation source of fluorescence excitation sent couples light to input port 10, and the light that fluorescence photosensitive material produces is inputted by output port 14, and exported by output port 12.As required, fiber coupler 100 can adopt multimode or single-mode optical-fibre coupler.Because fluorescence has very large bandwidth, a part of fluorescence inputted by output port 14 to be also coupled in the optical fiber of input end and to be exported by input port 12, and feeds back to excitation source, and this part fluorescence likely can affect the work of excitation source.Usual employing isolator or a short wave-pass filter are placed between excitation source and fiber coupler and solve this problem.
Fig. 2 is a schematic diagram of the present invention, the light beam 4 that excitation source 2 sends is coupled in the input port 10 of fiber coupler 100 by the light beam 8 after coupled lens 6 focuses on, and after the output port 14 of fiber coupler 100 exports, be irradiated to be set directly at output port 14 surface fluorescence inductive material 16 on, it is made to produce fluorescence, the fluorescence that fluorescence inductive material 16 produces is a kind of light dispersed, its part reflected fluorescent light is received by the output port 14 of fiber coupler 100, and is received by photodetector 20 after being exported by port one 2.Physics or the chemical parameters such as the concentration of the material acted on described fluorescence inductive material can be detected by the power measuring received fluorescence.
Because fluorescence inductive material 16 is set directly at the surface of output port 14, only need to cover the output end face of optical fiber, therefore, sensing head small-sized.The fluorescent light beam sent from port one 2 is a kind of light dispersed, and therefore, the receiving area of photodetector 20 and the distance of photodetector 20 and port one 2 all can affect the fluorescence intensity that photodetector 20 receives.Therefore, photodetector 20 should be placed on the position near port one 2 as far as possible, and the photodetector selecting receiving area larger, be conducive to strengthening the fluorescence intensity received.Difformity due to output port 14 surface of fiber coupler 100 can affect fluorescence inductive material and cover area on fiber-optic output face, and the output characteristics of exciting light to export from output port 14 and the transport property of fluorescence fiber coupler 100, thus, affect the performance of sensor apparatus.Therefore, according to different application, can by output port 14 being arranged to different surface configurations, to improve the performance of sensor apparatus.Fig. 3 shows the shape of three kinds of common fiber end faces, comprises plane, inclined-plane and curved surfaces.Also as required, other shapes can be arranged to.
Fig. 4 is a centre wavelength is λ
p, the half width of spectrum is △ λ
pthe spectrum schematic diagram of excitation source 2. excitation source can adopt broadband LED light source or laser light source usually.The output spectrum of LED is much wider than the output spectrum of semiconductor laser, the half width △ λ of spectrum
pcan from a few nanometer to tens nanometers, the angle of divergence of output is also very large, must with coupled lens could effectively by the light beam coupling of excitation source in optical fiber.And the half width △ λ of the spectrum of laser light source
pwant much narrow.Fig. 5 adopts the fluorescence spectrum schematic diagram in fluorescence method sensor apparatus. for different fluorescence inductive materials, and the half width △ λ of fluorescence spectrum
fbe tens to hundreds of nanometer, centre wavelength
?λ
fthan the central wavelength lambda of the light source for fluorescence excitation
plong tens to hundreds of nanometer.
Innovative point of the present invention is: adopt a kind of fiber coupler and be set directly on an output end face of fiber coupler by fluorescence inductive material, and make the structure of sensor apparatus simple, the size of sensing head is little, is specially adapted to the sensing detection of crawl space.
Claims (6)
1. a fluorescence method Fibre Optical Sensor instrument, comprise excitation source, coupled lens, fiber coupler, fluorescence inductive material, photodetector, the light that described excitation source sends is coupled to the input end of described fiber coupler by described coupled lens, described fluorescence inductive material is set directly on the first output end face of described fiber coupler, the illumination that described fiber coupler first output terminal exports is mapped on described fluorescence inductive material, the fluorescence sent exports at the second output terminal of described fiber coupler, and by described photoelectric detector, physics or the chemical parameters such as the concentration of the material acted on described fluorescence inductive material can be detected by the power measuring received fluorescence, first output end face of described fiber coupler can be plane, or inclined-plane, or disc, or other shapes.
2. a kind of fluorescence method Fibre Optical Sensor instrument according to right 1, is characterized in that: excitation source is a kind of LED light source of broadband or the LASER Light Source of arrowband.
3. a kind of fluorescence method Fibre Optical Sensor instrument according to right 1, is characterized in that: the wavelength of fluorescence that the centre wavelength of described excitation source sends than fluorescence inductive material is short.
4. a kind of fluorescence method Fibre Optical Sensor instrument according to right 1, is characterized in that: described fiber coupler can be single-mode optical-fibre coupler or multi-module optical fiber coupler, and has three ports, comprise an input port, two output ports.
5. a kind of fluorescence method Fibre Optical Sensor instrument according to right 1, is characterized in that: described fluorescence inductive material is set directly on the fiber end face of the first output terminal of described fiber coupler.
6. a kind of fluorescence method Fibre Optical Sensor instrument according to right 1, is characterized in that: the fluorescence spectrum that described photodetector sends with described fluorescence inductive material has substantially identical spectral range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310266522.1A CN104251848A (en) | 2013-06-28 | 2013-06-28 | Fluorescence method optical fiber sensor |
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| CN201310266522.1A CN104251848A (en) | 2013-06-28 | 2013-06-28 | Fluorescence method optical fiber sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387167A (en) * | 2018-12-04 | 2019-02-26 | 上海润京能源科技有限公司 | A kind of fiber cut face detection device and detection method |
| CN111413306A (en) * | 2020-04-07 | 2020-07-14 | 光越科技(深圳)有限公司 | Fluorescence detector, detection array and method for manufacturing fluorescence detector |
| CN113720825A (en) * | 2021-11-04 | 2021-11-30 | 四川丹诺迪科技有限公司 | Optical instant detector and detection method and application |
-
2013
- 2013-06-28 CN CN201310266522.1A patent/CN104251848A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387167A (en) * | 2018-12-04 | 2019-02-26 | 上海润京能源科技有限公司 | A kind of fiber cut face detection device and detection method |
| CN111413306A (en) * | 2020-04-07 | 2020-07-14 | 光越科技(深圳)有限公司 | Fluorescence detector, detection array and method for manufacturing fluorescence detector |
| CN113720825A (en) * | 2021-11-04 | 2021-11-30 | 四川丹诺迪科技有限公司 | Optical instant detector and detection method and application |
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Application publication date: 20141231 |