CN205656127U - Reflective SPR refracting index sensor based on tapered fiber long period grating - Google Patents
Reflective SPR refracting index sensor based on tapered fiber long period grating Download PDFInfo
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- CN205656127U CN205656127U CN201620332936.9U CN201620332936U CN205656127U CN 205656127 U CN205656127 U CN 205656127U CN 201620332936 U CN201620332936 U CN 201620332936U CN 205656127 U CN205656127 U CN 205656127U
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Abstract
The utility model relates to a reflective SPR refracting index sensor based on tapered fiber long period grating, its characterized in that includes a broadband light source, an optical isolator, a polarization controller, 3 port optical circulators, a reflective SPR sensing head and a spectrum appearance based on tapered fiber long period grating, broadband light source's output links to each other with optical isolator, and optical isolator's output links to each other with polarization controller, and polarization controller's output links to each other with 1 port of optical circulator, and 2 ports of optical circulator link to each other with the reflective SPR sensing head based on tapered fiber long period grating, and 3 ports of optical circulator link to each other with spectrum appearance input, wherein constitute by the sensing district and the total reflection membrane of tapered fiber, long period grating, gilding membrane based on the reflective SPR sensing head of tapered fiber long period grating. The utility model discloses simple structure, with low costs, sensitivity is high, convenient to use.
Description
Technical field
This utility model belongs to technical field of optical fiber sensing, particularly to reflective SPR index sensor based on conical fiber long-period gratings.
Background technology
LPFG (Long-Period Fiber Grating, the LPFG) cycle of finger is tens to hundreds of micron and can realize the fiber grating of coupling between pattern in the same direction.Typically now the fibre core basic mode of meaning is coupled to the LPFG of cladding mode of symport, is that Vengsarkar by AT&T AT&T Labs et al. irradiated hydrogen bearing SiGe optical fiber with ultraviolet light by vibration amplitude mask plate in 1996 and first develops.Surface plasma body resonant vibration (Surface Plasmon Resonance, it is called for short SPR) refer to that the p-type sent when light source polarizes the polychromatic light interface through film metal Yu medium, if meeting angle of incidence more than the cirtical angle of total reflection, define the Gradient distribution of electron concentration from the teeth outwards, form plasma oscillation, form surface plasma wave, existence due to evanescent wave field, surface Yu metal complex refractivity index, the light meeting resonance wavelength is made to be partly absorbed, the phenomenon that the light of its commplementary wave length is reflected.Nineteen sixty-eight, roentgen Otto and Kretschmann each uses the method for (Attenuated Total Reflection, be called for short ATR) to achieve the exciting of surface plasma of optical frequency wave band in an experiment.
1902, Wood found anomalous diffraction phenomenon in Experiments of Optics；Nineteen sixty-eight, roentgen Otto and Kretschmann each uses the method for (Attenuated Total Reflection, be called for short ATR) to achieve the exciting of surface plasma of optical frequency wave band in an experiment.Carry out substantial amounts of improvement according to different research and application on this basis, be widely used in multiple fields such as biochemistry, medical science, environmental monitoring and food safety.Along with deepening continuously of research work, the volume of prism sensor is big, is not suitable for the shortcomings such as long-haul telemetry and gradually appears.1993, Jorgenson et al. achieves optical fiber chemical industry sensor based on SPR experimentally, compared to glass prism SPR sensor, it has, and volume is little, response is fast, low cost, can be implemented in the advantages such as line monitoring in real time, has bigger Research Prospects and economic worth.Entered the development of more than 20 year, optical fiber SPR sensor is widely used as the detection of biology and chemical field, typical optical fiber SPR sensor is mainly based upon the detection of spectral resonance angle and resonance wavelength, or based on SPR stiffness of coupling and the measurement of phase place, these detection certain structures are complicated, and strict to detection environmental requirement, some needs complicated data handling procedure, practicality is not strong, and the sensitivity generally measured and resolution are the highest.
The problem such as complicated for above-mentioned surface plasma body resonant vibration (SPR) sensor construction based on optical fiber structure, sensitivity is low, resolution is low, use is inconvenient, the utility model proposes a kind of reflective SPR index sensor based on conical fiber long-period gratings, simple in construction, low cost, highly sensitive, easy to use, there is the strongest practical value.
Utility model content
In order to overcome the problems such as surface plasma body resonant vibration (SPR) sensor sense header structure based on optical fiber structure is complicated, sensitivity is low, resolution is low, use is inconvenient, the utility model proposes a kind of simple in construction, low cost, highly sensitive, easy to use, there is based on conical fiber long-period gratings the reflective SPR index sensor of the strongest practical value.
This utility model is by solving the technical scheme that technical problem is taked:
Reflective SPR index sensor based on conical fiber long-period gratings, including: wideband light source, optoisolator, Polarization Controller, 3 ports light rings, reflective SPR sensorgram head based on conical fiber long-period gratings, spectrogrph.
In reflective SPR index sensor based on conical fiber long-period gratings, the outfan of wideband light source is connected with optoisolator, the outfan of optoisolator is connected with Polarization Controller, the outfan of Polarization Controller is connected with optical circulator 1 port, 2 ports of optical circulator are connected with reflective SPR sensorgram head based on conical fiber long-period gratings, and 3 ports of optical circulator are connected with spectrometer input；Reflective SPR sensorgram head based on conical fiber long-period gratings is made up of conical fiber, long-period gratings, the sensing unit of gold-plated film and total reflection film；Wherein conical fiber residue cladding thickness is between 25 μm to 45 μm, it is ensured that cladding mode is coupled to SPR sensorgram district；Long-period gratings centre wavelength is chosen between 400nm to 1250nm according to testing sample；The thickness of gold film is between 30nm to 50nm, and the root-mean-square of surface roughness is less than or equal to 3nm；Total reflection film requires that the reflectance of the light to resonance wavelength is more than 85%；The variations in refractive index of solution to be measured around the sensing unit of gold-plated film, causes the drift of SPR resonance wavelength；Spectrogrph is as signal test system.
The beneficial effects of the utility model are:
This utility model utilizes long-period gratings and conical fiber to constitute reflective SPR sensorgram head, improves the transformation efficiency of resonance wavelength so that the change of resonance wavelength refractive index is more sensitive, improves sensitivity and the resolution of spr sensor；
Sensing head of the present utility model is probe-type sensing head, and this probe-type sensing head is applicable to complex detection environment, and required testing sample amount is few；
This utility model utilizes long-period gratings that basic mode is coupled to cladding mode, and improves pattern flood rate by reducing fibre cladding thickness, it is achieved the high-sensitivity detection of refractive index；
The uniform segment being coated with gold film is bored district as SPR sensorgram district by this utility model, by plating different types of biotin affinity membrane (such as Streptavidin) outside SPR sensorgram district gold film, high sensitivity, the specific detection of high-resolution biological substance (such as protein) can be realized；
This utility model using be coated with gold film uniform segment cone district as SPR sensorgram district, by plating different types of volatile organic matter affinity membrane outside SPR sensorgram district gold film, high sensitivity, the specific detection of high-resolution volatile organic matter can be realized；
This utility model utilizes spectrogrph as signal demodulating system, can realize the on-line checking that refractive index is real-time.
Accompanying drawing explanation
Fig. 1 is this novel reflective SPR index sensor method for sensing based on conical fiber long-period gratings and apparatus structure schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings utility model is further described.
As shown in Figure 1, reflective SPR index sensor based on conical fiber long-period gratings, including: wideband light source 1, optoisolator 2, Polarization Controller 3,3 ports light rings 4, reflective SPR sensorgram head 5 based on conical fiber long-period gratings, spectrogrph 6；The outfan of wideband light source 1 is connected with optoisolator 2, the outfan of optoisolator 2 is connected with Polarization Controller 3, the outfan of Polarization Controller 3 is connected with the 1_1 port of optical circulator 4, the 1_2 port of optical circulator 4 is connected with reflective SPR sensorgram head 5 based on conical fiber long-period gratings, and the 1_3 port of optical circulator 4 is connected with the input of spectrogrph 6；P polarization light is produced by wideband light source 1, optoisolator 2 and Polarization Controller 3 structure；Around reflective SPR sensorgram head 5 based on conical fiber long-period gratings, the variations in refractive index of solution to be measured, causes the drift of SPR resonance wavelength；Spectrogrph 6 is as signal test system；Reflective SPR sensorgram head 5 based on conical fiber long-period gratings includes conical fiber 7, long-period gratings 8, the sensing unit 9 of gold-plated film and total reflection film 10；Wherein conical fiber 7 remains cladding thickness between 25 μm to 45 μm, it is ensured that cladding mode is coupled to SPR sensorgram district；Long-period gratings 8 centre wavelength is chosen between 400nm to 1250nm according to testing sample；The sensing unit 9 of gold-plated film produces district and SPR sensorgram district as plasma, and the thickness of gold film is between 30nm to 50nm, and the root-mean-square of surface roughness is less than or equal to 3nm；Total reflection film 10 requires that the reflectance of the light to resonance wavelength is more than 85%.
nullWorking method of the present utility model is: wideband light source 1 produces flashlight，It is input to optoisolator 2 by Transmission Fibers，The optical signal of optoisolator 2 output becomes P polarization light by Polarization Controller 3，P polarization light inputs from the 1_1 port of optical circulator 4，Export from the 1_2 port of optical circulator 4，The optical signal exported from the 1_2 port of optical circulator 4 enters reflective SPR sensorgram head 5 based on conical fiber long-period gratings through Transmission Fibers，Input light is after long-period gratings 8 couples，Enter the sensing unit 9 of gold-plated film，Owing to the thickness of conical fiber 7 covering reduces，And basement membrane is coupled to cladding mode by long-period gratings 8，Some patterns of fibre core and covering couple the interface generation surface plasmon resonance effect of fibre cladding and gold film with the form of evanescent wave，Produce the light wave of surface plasmon resonance effect presented in surface plasma-wave，Remaining light wave continues to propagate，After total reflection film 10 reflects，There is SPR effect in the sensing unit 9 again passing by gold-plated film，Through twice resonance，More plasma will be produced and form surface plasma wave，Improve the coupling efficiency of SPR，Strengthen the resonance wavelength sensitivity to outside variations in refractive index，Thus improve sensitivity and the resolution of optical fiber SPR sensor；Reflectance spectrum exports via the 1_3 port of optical circulator 4 and is received by spectrogrph 6, when the refractive index of measurand changes, the generation drift of SPR resonance wavelength, by detecting the drift value of wavelength, characteristic in conjunction with spr sensor, it is achieved the high-sensitivity measurement of refractive index.
This device is capable of the key technology of reflective SPR index sensor based on conical fiber long-period gratings measurement to be had:
1, reflective SPR sensorgram head based on conical fiber long-period gratings is the basis realizing high-sensitivity measurement.
2, the screen periods of long-period gratings determines the centre wavelength of its CGCM, by rationally selecting screen periods, makes centre wavelength be positioned near the resonant wavelength of SPR, improves its sensitivity.
3, the thickness of conical fiber residue covering.Along with the reduction of cladding thickness, increasing core mode can be made to be coupled to the air gap, if but covering is the thinnest, and can cause occurring that pattern is not mated so that core mode is revealed completely, be lost the biggest；The thickest causing is coupled to the pattern of gold film clad interface very little, and SPR coupling efficiency reduces, and the thickness therefore remaining covering should control between 25 μm to 45 μm.
4, thickness and the roughness of the golden film in LPFG region it are carved with.Gold film thickness can affect acuity and the extinction ratio of the resonance wavelength resonance peak of SPR, the degree of roughness on gold film surface can affect the loss of surface plasma, and then affect the performance of SPR, therefore, the thickness of gold film should strictly control between 30nm～50nm, and the root-mean-square of the roughness on gold film surface should be less than equal to 3nm.
5, according to surface plasma body resonant vibration theory, only P polarization light ability excitating surface plasma wave (SPW), ensure that hence with Polarization Controller the flashlight of the conical fiber of input is complete P polarization light；The stability of light source is also the important sources of spr sensor error, should ensure that the stability of light source works.
In a specific embodiment of the present utility model, the stable halogen tungsten lamp of Thorlabs, between model SLS201 (/M) output wavelength 300 to 2600nm；Optoisolator model is IO-2D-633-VLPa, and operation wavelength is 560-663nm, and isolation is between 35-40dB；Polarization Controller model is PLC-900；3 port photocirculators are that Sichuan causes remote science and technology production, and isolation is between 40-50dB；Conical fiber core diameter is 9 μm, and the thickness of residue covering is 30 μm, and axial length is lcm；LPFG screen periods 0.257mm, centre wavelength is 660nm；Gold film thickness is 45nm, and surface roughness root-mean-square is 2.3nm；Refractometry scope is 1.3～1.4.
Shown in the above and figure is only preferred implementation of the present utility model.Those of ordinary skill in the art is on the premise of without departing from principle of the present utility model, it is also possible to make some modification and improvement, and these also should be regarded as belonging to protection domain of the present utility model.
Claims (1)
1. reflective SPR index sensor based on conical fiber long-period gratings, including: wideband light source, optoisolator, partially
Shake controller, 3 ports light rings, reflective SPR sensorgram head based on conical fiber long-period gratings, spectrogrph；
In this utility model, the outfan of wideband light source is connected with optoisolator, the outfan of optoisolator and Polarization Controller phase
Even, the outfan of Polarization Controller is connected with optical circulator 1 port, 2 ports of optical circulator and based on conical fiber long period
The reflective SPR sensorgram head of grating is connected, and 3 ports of optical circulator are connected with spectrometer input；
Reflective SPR sensorgram head based on conical fiber long-period gratings is by conical fiber, long-period gratings, the sensing of gold-plated film
District and total reflection film composition；Wherein conical fiber residue cladding thickness is between 25 μm to 45 μm, it is ensured that cladding mode is coupled to SPR
Sensing unit；Long-period gratings centre wavelength is chosen between 400nm to 1250nm according to testing sample；The thickness of gold film is at 30nm
Between 50nm, the root-mean-square of surface roughness is less than or equal to 3nm；Total reflection film requires the reflectance of the light to resonance wavelength
More than 85%；The variations in refractive index of solution to be measured around the sensing unit of gold-plated film, causes the drift of SPR resonance wavelength；Spectrum
Instrument is as signal test system.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
| CN109540179A (en) * | 2018-12-21 | 2019-03-29 | 南京信息工程大学 | Optical fiber taper sensing probe based on surface plasma body resonant vibration and preparation method thereof |
| CN109632659A (en) * | 2019-01-04 | 2019-04-16 | 京东方科技集团股份有限公司 | A kind of detector and detection method |
| CN110690639A (en) * | 2018-07-05 | 2020-01-14 | 北京交通大学 | High efficiency injection locked fiber taper laser |
-
2016
- 2016-04-13 CN CN201620332936.9U patent/CN205656127U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
| CN110690639A (en) * | 2018-07-05 | 2020-01-14 | 北京交通大学 | High efficiency injection locked fiber taper laser |
| CN110690639B (en) * | 2018-07-05 | 2020-12-01 | 北京交通大学 | High efficiency injection locked fiber taper laser |
| CN109540179A (en) * | 2018-12-21 | 2019-03-29 | 南京信息工程大学 | Optical fiber taper sensing probe based on surface plasma body resonant vibration and preparation method thereof |
| CN109540179B (en) * | 2018-12-21 | 2024-05-17 | 南京信息工程大学 | Optical fiber conical sensing probe based on surface plasma resonance and manufacturing method thereof |
| CN109632659A (en) * | 2019-01-04 | 2019-04-16 | 京东方科技集团股份有限公司 | A kind of detector and detection method |
| CN109632659B (en) * | 2019-01-04 | 2022-07-05 | 京东方科技集团股份有限公司 | Detector and detection method |
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Granted publication date: 20161019 Termination date: 20170413 |
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