CN216449434U - Optical fiber SPR sensor capable of continuously adjusting working waveband - Google Patents
Optical fiber SPR sensor capable of continuously adjusting working waveband Download PDFInfo
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Abstract
The utility model belongs to the field of optical fiber sensing, and relates to an optical fiber SPR sensor capable of continuously adjusting a working waveband. The device comprises a wide-spectrum light source, a light injection optical fiber, a sensing optical fiber, an adjustable monochromatic light source, a light receiving optical fiber, a spectrometer and a computer. The left end of the light injection optical fiber is connected with the wide-spectrum light source, and the right end of the light injection optical fiber is coaxially welded with the left end of the sensing optical fiber; the surface of the sensing optical fiber is plated with a sensing metal film, and the outer side of the sensing metal film is plated with a sensing modulation film of which the dielectric constant can change along with the light intensity of the adjustable monochromatic light source; the adjustable monochromatic light source is arranged right above the sensing optical fiber; the right end of the sensing optical fiber is coaxially butted with the light receiving optical fiber; the light receiving optical fiber is connected with the spectrometer and used for collecting emergent light of the spectrometer and displaying a spectrum; the spectrometer is connected with a computer for post data processing. The technical scheme of the application has the characteristic that the working waveband range is continuously adjustable, overcomes the defect that the working waveband range of the traditional optical fiber SPR sensor is single, and lays a foundation for realizing optical fiber SPR multichannel sensing based on the wavelength division multiplexing technology.
Description
Technical Field
The utility model belongs to the field of optical fiber sensing, and relates to an optical fiber SPR sensor capable of continuously adjusting a working waveband.
Background
The Surface Plasmon Resonance (SPR) sensor is a new biochemical detection technology, has the advantages of high sensitivity, no need of marking, real-time detection and the like, and is widely applied to the fields of food safety, environmental detection, biomedicine and the like.
The optical fiber SPR sensor is a novel optical fiber sensor manufactured based on the SPR principle, and has the advantages of small size, high sensitivity, electromagnetic radiation and interference resistance, capability of realizing remote sensing measurement and the like. The principle of fiber SPR detection can be described as: when light beams enter the light sparse medium from the optically dense medium, the light beams are totally reflected at the interface of the two media, and the electromagnetic field intensity of the light waves is not immediately reduced to zero at the interface, but is exponentially attenuated along with the incident depth to form evanescent waves. The effective depth of the evanescent wave is generally 100-200 nm, and the evanescent wave still acts at the interface of the metal film and the solution because the thickness of the metal film of the optical fiber SPR sensor is smaller than the depth of the evanescent wave. Meanwhile, at the interface of the metal film and the sample, free electrons on the surface of the metal are excited to form surface plasma waves. And different incidence angles correspond to different propagation modes, when the incidence angle is a certain appropriate value, the evanescent wave is equal to the frequency and wave number of the metal surface plasma, the evanescent wave and the metal surface plasma resonate, partial energy of incident light is absorbed, the energy of reflected light is sharply reduced, and a resonant peak with the lowest reflection intensity appears on a reflection spectrum. When the refractive indexes of media contacting the surface of the metal film are different, the position of a resonance peak of the metal film is changed, so that the refractive index of a sample to be detected can be detected by changing the difference between the refractive index of liquid to be detected and the refractive index of the fiber core.
However, once the optical fiber is manufactured, the refractive index of the fiber core is fixed, and the working wavelength range of the optical fiber SPR sensor processed based on the optical fiber is fixed, so that the optical fiber SPR sensor processed by the traditional process has the defect that the working wavelength range cannot be changed, and the multichannel sensing based on the wavelength division multiplexing technology is difficult to realize.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an optical fiber SPR sensor capable of continuously adjusting the working waveband, and overcomes the defect that the working waveband of the traditional optical fiber SPR sensor cannot be dynamically changed. The method comprises the steps of sequentially plating a gold film and a carbon disulfide film on the surface of an optical fiber with a coating layer removed by a plasma sputtering coating technology and a magnetron sputtering coating technology, irradiating an adjustable monochromatic light source to a sensing area with the film coated, changing the dielectric constant of the carbon disulfide modulation film through the power change of the monochromatic light source, further changing the resonance spectrum range of the optical fiber SPR effect, and realizing dynamic adjustment of the working waveband.
In order to achieve the purpose, the utility model provides the following technical scheme:
an optical fiber SPR sensor capable of continuously adjusting working wave bands comprises a wide-spectrum light source 1, a light injection optical fiber 2, a sensing optical fiber 3, an adjustable monochromatic light source 4, a light receiving optical fiber 5, a spectrometer 6 and a computer 7; the wide-spectrum light source 1 is connected with the left end of the light injection optical fiber 2 to provide incident light for the whole device; the right end of the light injection optical fiber 2 is coaxially welded with the left end of the sensing optical fiber 3; the sensing area is arranged in the middle of the sensing optical fiber 3; a sensing metal film 3-1 is annularly plated on the surface of the sensing area; a sensing modulation film 3-2 with the dielectric constant continuously changing along with the light intensity of the adjustable monochromatic light source is annularly plated on the outer side of the sensing metal film 3-1; the monochromatic light source 4 is positioned right above the sensing modulation film 3-2, and the right end of the sensing optical fiber 3 is coaxially welded with the left end of the light receiving optical fiber 5; the right end of the light receiving optical fiber 5 is connected with the spectrometer 6 and used for collecting emergent light and displaying a spectrum; the spectrometer 6 is connected to a computer 7 for subsequent data processing. The wide spectrum light source 1 is used for generating stable input light; the light injection optical fiber 2 is used for receiving and transmitting input light of the wide-spectrum light source 1; the middle 2cm of the sensing optical fiber 3 is a sensing area, the sensing area is sequentially coated with a sensing gold film 3-1 and a sensing modulation film 3-2, and the linear relation n between the refractive index of the sensing modulation film 3-2 and the intensity of an externally added adjustable monochromatic light source 4 is utilized0+ gamma I (where n is0Is a linear index of refraction with a value of 1.6272. Gamma is a nonlinear coefficient having a value of 2.1 × 10-7μm2Watt (watt). I is the irradiance of a laser beam), the dielectric constant of a sensing modulation film 3-2 (which can be a carbon disulfide film) is changed by adjusting the illumination intensity of an additional adjustable monochromatic light source 4, and then the working waveband range of an SPR resonance spectrum is changed; the light receiving optical fiber 5 is used for receiving and transmitting output light; the spectrometer 6 is used for collecting emergent light and displaying a spectrum; the computer 7 is used for carrying out subsequent countingAnd (6) processing.
Optionally, the light injection fiber is a common single mode fiber, the sensing fiber core diameter is 125 μm, and the light receiving fiber is a step multimode fiber having a core diameter of 105 μm.
Optionally, the sensing fiber is a multimode fiber.
Optionally, the light-collecting fiber is a step-index or graded-index multimode fiber with a larger core diameter.
Optionally, the sensing metal film may be a gold film, a silver film, or other noble metal films capable of generating SPR effect, the thickness of the sensing gold film is generally 50nm, and the other noble metal films may have a suitable film thickness according to the sensing requirement; the sensing modulation membrane can be carbon disulfide or other dielectric constant can be along with the material of light intensity change, and the carbon disulfide membrane is thick is 20nm, and other materials can be according to the sensing demand selection and correspond the membrane thickness.
The optical fiber SPR sensor capable of continuously adjusting the working waveband provided by the utility model has the advantages of novel structure, small manufacturing difficulty, adjustable working waveband and the like. The control method is simple and easy to operate, has strong real-time performance, can continuously and steplessly adjust, overcomes the defect of single working waveband range of the traditional optical fiber SPR sensor, and lays a foundation for realizing optical fiber SPR multichannel sensing based on the wavelength division multiplexing technology. The method can be widely researched and applied in the fields of biological pharmacy, food safety detection and chemical detection.
Additional advantages, objects, and features of the utility model will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the utility model. The objectives and other advantages of the utility model may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the utility model, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a system schematic of a fiber SPR sensor with continuously adjustable operating band;
FIG. 2 is a schematic diagram of a fiber SPR sensor with continuously adjustable operating band;
FIG. 3 is a graph of experimental testing of the inoperability of an adjustable monochromatic light source;
FIG. 4 shows that the illumination power density of the adjustable monochromatic light source is 40mW/mm2The experimental test curve of (2);
FIG. 5 shows that the illumination power density of the adjustable monochromatic light source is 60mW/mm2The experimental test curve of (2);
FIG. 6 shows that the illumination power density of the adjustable monochromatic light source 4 is 80mW/mm2The experimental test curve of (2);
FIG. 7 shows that the illumination power density of the adjustable monochromatic light source 4 is 100mW/mm2Experimental test of (2).
Detailed Description
Other advantages of the present invention will become readily apparent to those skilled in the art from the following description, wherein it is shown and described only certain embodiments of the utility model. The utility model is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the utility model only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the utility model thereto; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1-2, wherein the reference numbers indicate the following elements: the device comprises a wide-spectrum light source 1, a light injection optical fiber 2, a sensing optical fiber 3, a sensing metal film 3-1, a sensing modulation film 3-2, an adjustable monochromatic light source 4, a light receiving optical fiber 5, a spectrometer 6 and a computer 7.
The utility model relates to an optical fiber SPR sensor capable of continuously adjusting a working waveband, wherein a light source 1 is a wide-spectrum light source, and the wavelength range is 400-2400 nm; the light injection fiber 2 is a common single mode fiber, the diameter of a fiber core is 8.3 mu m, the length of the fiber core is 1m, and the light injection fiber is used for transmitting light emitted by the wide-spectrum light source 1 and injecting the light into the sensing fiber 3; the sensing optical fiber 3 is a plastic cladding multimode optical fiber with the fiber core diameter of 125 mu m, the plastic cladding diameter of 170 mu m and the coating diameter of 250 mu m, the coating and the plastic cladding are removed in the middle 2cm area of the sensing optical fiber 3 through mechanical stripping, and a 50nm metal film 3-1 and a 20nm carbon disulfide film 3-2 are annularly plated; the adjustable monochromatic light source 4 uses monochromatic light with the wavelength of 800nm, the maximum power is 500mW, and a power continuous adjustable controller is arranged; the light receiving fiber 5 is a step multimode fiber with the core diameter of 105 μm and the cladding diameter of 125 μm, the length of the light receiving fiber 5 is 1m, the light receiving fiber 5 is used for transmitting the light output by the sensing fiber 3 into the spectrometer 6 for the spectrometer 6 to collect and demodulate the light signals, and the computer 7 analyzes and processes the collected data. The spectrometer 6 involved is a cross river AQ6373B spectrometer, the wavelength range covering 350 and 1200 nm.
The specific preparation method comprises the following steps: taking a section of 1m long single-mode light injection optical fiber 2, stripping the coating layers at two ends of the light injection optical fiber 2 by 3-5cm by using Miller pliers, wiping the coating layers clean by using alcohol, performing leveling treatment on two ends of the light injection optical fiber 2 by using an optical fiber cutter, and placing one side for later use after the treatment is completed; taking a section of 10cm sensing optical fiber 3 (taking a plastic cladding multimode fiber as an example) and a section of 1m long light-receiving optical fiber 5 (taking a step multimode fiber with a fiber core diameter of 105 μm, a cladding diameter of 125 μm and a numerical aperture of 0.22 as an example), and flattening two ends in the same way; stripping the coating layer and the plastic cladding layer at the position 2cm away from the middle of the sensing optical fiber by using a blade, and cleaning by using alcohol to serve as a sensing area of the sensing optical fiber; placing the right end of the processed light injection optical fiber 2 and the left end of the sensing optical fiber 3 on a clamp of an optical fiber welding machine, and taking out the welded optical fiber after coaxial welding; similarly, the left end of the processed light-receiving optical fiber step multimode optical fiber 5 and the right end of the sensing optical fiber 3 are placed on a welding machine fixture, the welded optical fiber is taken out after coaxial welding is performed, and the manufacturing of the sensing probe structure is completed; the sensing probe structure is wiped by dipping appropriate amount of high-concentration alcohol with non-woven fabrics, the optical fiber of the sensing probe structure is clamped and fixed on an optical fiber rotary clamp of a metal sputtering instrument, a 50nm gold film is annularly plated, then a 20nm carbon disulfide film is annularly plated, and the optical fiber SPR sensing probe capable of continuously adjusting the working waveband is manufactured.
Fig. 3-7 are experimental test curves of the fiber SPR sensor according to the present invention, in which the adjustable monochromatic light source 4 does not operate, the refractive index of the solution to be measured is in the range of 1.33RIU-1.37RIU, the experimental data is normalized, and the resonance wavelength range is 711.212nm to 839.596 nm; FIGS. 4 to 7 show the experimental data of the adjustable monochromatic light source 4 working, the refractive index range of the solution to be measured is 1.33RIU-1.37RIU, and the normalization, wherein FIG. 4 shows that the illumination power density of the adjustable monochromatic light source 4 is 40mW/mm2The resonance wavelength range of the experimental test curve is 744.343nm to 876.869nm, and compared with the non-operation of the adjustable light source 4, the SPR working wave band is shifted towards long wavelength by 33.131 nm; FIG. 5 shows that the illumination power density of the adjustable monochromatic light source 4 is 60mW/mm2The resonance wavelength range of the experimental test curve is 752.626nm to 889.293nm, and the experimental test curve does not work compared with the adjustable light source 4When the wavelength is short, the SPR working band is shifted to 41.414nm towards long wavelength; FIG. 6 shows that the illumination power density of the adjustable monochromatic light source 4 is 80mW/mm2The resonance wavelength range of the experimental test curve is 756.768nm to 897.576nm, and compared with the non-operation of the adjustable light source 4, the SPR working wave band is shifted towards long wavelength by 45.556 nm; FIG. 7 shows that the illumination power density of the adjustable monochromatic light source 4 is 100mW/mm2The resonance wavelength range is 769.192nm to 912.626nm, which is 57.98nm shifted to longer wavelength than the SPR operating band when the tunable light source 4 is not operating. According to experimental test results, the illumination power density of the adjustable monochromatic light source 4 is adjusted to be increased, and the working waveband of the SPR sensor integrally moves to the long wavelength, namely the optical fiber SPR sensor capable of continuously adjusting the working waveband can achieve continuous adjustment of the working waveband.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. An optical fiber SPR sensor capable of continuously adjusting working wave band is characterized in that: the device comprises a wide-spectrum light source (1), a light injection optical fiber (2), a sensing optical fiber (3), an adjustable monochromatic light source (4), a light receiving optical fiber (5), a spectrometer (6) and a computer (7), wherein the wide-spectrum light source (1) is connected with the left end of the light injection optical fiber (2), the right end of the light injection optical fiber (2) is coaxially welded with the left end of the sensing optical fiber (3), a sensing metal film (3-1) is annularly plated on the surface of the sensing optical fiber (3), a sensing modulation film (3-2) with the dielectric constant continuously changing along with the light intensity of the adjustable monochromatic light source (4) is annularly plated on the outer side of the sensing metal film (3-1), the monochromatic light source (4) is positioned right above the sensing modulation film (3-2), and the right end of the sensing optical fiber (3) is coaxially welded with the left end of the light receiving optical fiber (5); the right end of the light receiving optical fiber (5) is connected with the spectrometer (6) to collect spectra, the spectrometer (6) is connected with the computer (7) to process data, and the dielectric constant of the sensing modulation film (3-2) can be changed along with the change of the illumination intensity of the monochromatic light source (4).
2. A fiber SPR sensor according to claim 1 wherein the operating band is continuously adjustable: the light injection optical fiber (2) is a single-mode optical fiber, and the diameter of a fiber core is 8-10 mu m.
3. A fiber SPR sensor according to claim 1 wherein the operating band is continuously adjustable: the sensing optical fiber (3) is a plastic cladding multimode optical fiber with the fiber core diameter of 125 mu m, and a sensing area is arranged in the middle 2cm of the sensing optical fiber.
4. A fiber SPR sensor according to claim 1 wherein the operating band is continuously adjustable: the sensing metal film (3-1) is a gold film or a silver film.
5. A fiber SPR sensor according to claim 1 wherein the operating band is continuously adjustable: the sensing modulation film (3-2) is a carbon disulfide film, and the thickness of the sensing modulation carbon disulfide film is 20 nm.
6. A fiber SPR sensor according to claim 1 wherein the operating band is continuously adjustable: the wavelength of the adjustable monochromatic light source (4) is 800nm, and the illumination power density is continuously adjustable.
7. A fiber SPR sensor according to claim 1 wherein the operating band is continuously adjustable: the light-receiving optical fiber (5) is a step-index multimode fiber or a graded-index multimode fiber with a large core diameter, the diameter of the core is 105 mu m or 110 mu m, and the diameter of the cladding is 125 mu m.
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