CN116593425A - Multi-side polishing temperature compensation SPR sensor based on multimode optical fiber - Google Patents
Multi-side polishing temperature compensation SPR sensor based on multimode optical fiber Download PDFInfo
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- CN116593425A CN116593425A CN202310582906.8A CN202310582906A CN116593425A CN 116593425 A CN116593425 A CN 116593425A CN 202310582906 A CN202310582906 A CN 202310582906A CN 116593425 A CN116593425 A CN 116593425A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 70
- 238000005498 polishing Methods 0.000 title claims abstract description 25
- 239000010453 quartz Substances 0.000 claims abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 238000001228 spectrum Methods 0.000 claims abstract description 13
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 12
- 150000002367 halogens Chemical class 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 14
- 239000010931 gold Substances 0.000 claims description 14
- 229910052737 gold Inorganic materials 0.000 claims description 14
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 11
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 11
- -1 polydimethylsiloxane Polymers 0.000 claims description 4
- 240000004282 Grewia occidentalis Species 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000007747 plating Methods 0.000 claims 2
- 238000005259 measurement Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000001448 refractive index detection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
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- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The application discloses a multi-mode optical fiber-based multi-side polishing temperature compensation SPR sensor, which comprises: a halogen broad spectrum light source for emitting light; the double-channel optical fiber SPR sensor is connected with the halogen broad spectrum light source and is used for changing the wavelength of light according to the environment; the quartz V-shaped groove plate is connected with the dual-channel optical fiber SPR sensor and is used for fixing optical fibers in the dual-channel optical fiber SPR sensor; the spectrum analyzer is connected with the dual-channel optical fiber SPR sensor and is used for receiving the optical signals transmitted by the dual-channel optical fiber SPR sensor and converting the optical signals into electric signals; and the computer is connected with the spectrum analyzer and is used for converting the electric signal into an analog signal and displaying the analog signal. The multi-side polishing temperature compensation SPR sensor based on the multimode fiber effectively reduces uncertainty caused by temperature in refractive index measurement.
Description
Technical Field
The application belongs to the technical field of optical fiber sensing, and particularly relates to a multi-side polishing temperature compensation SPR sensor based on multimode optical fibers.
Background
The optical fiber sensor uses an optical signal as a signal transmission medium of a measured object, and performs signal transmission by an optical fiber optical path. External environmental parameters such as temperature, pressure, magnetic field, refractive index, etc. may interact with the optical fiber or modulator to which the optical fiber is connected, thereby converting into a measurable optical signal. By measuring changes in the optical characteristics of the transmitted optical signal in the optical fiber, such as light intensity, wavelength, frequency, phase, polarization, etc., information about the measured parameter can be obtained. Therefore, the optical fiber sensor can accurately sense the external environment parameters. Electronic sensors are limited in their application due to their large size. In addition, the electronic sensor may be disturbed by electromagnetic noise, thereby affecting the performance of the sensor and reducing durability. In contrast, optical fiber sensors have many advantages such as high sensitivity, electromagnetic interference resistance, low cost, compact structure, and the like, and thus are receiving increasing attention from researchers. Many types of fiber optic sensors have been developed, including fiber optic grating sensors, surface plasmon resonance sensors, fiber optic interferometric sensors, and the like.
At present, the greatest disadvantage of the D-type optical fiber sensor is the limitation of factors such as technical conditions and manufacturing cost, so that most products are still in a laboratory stage and cannot be produced in batches. Optical fiber sensors have not been widely used in real life compared to other more sophisticated technologies. The application adopts multimode optical fiber to manufacture and adopts the quartz V-groove array provided by us to process the D-shaped optical fiber, thereby improving the success rate of preparation and having good encapsulation effect on the processed D-shaped optical fiber. This provides a direction for the popularity of fiber optic sensors and solves the manufacturing and packaging problems thereof.
Temperature and refractive index are two basic environmental parameters, and are widely applied to the fields of environmental monitoring, food production, medical detection, biological sensing and the like. Since the refractive index is closely related to the ambient temperature and varies with the temperature, it is necessary to detect the refractive index and the temperature of the object at the same time and perform temperature compensation on the refractive index to improve the accuracy of refractive index detection.
In summary, developing a temperature compensated sensor with high sensitivity and low manufacturing cost, which can be commercialized, is an important research direction of the current optical fiber SPR sensor.
Disclosure of Invention
In order to solve the technical problems, the application provides a multi-side polishing temperature compensation SPR sensor based on a multimode optical fiber, so as to solve the problems.
To achieve the above object, the present application provides a multi-mode optical fiber-based multi-side polishing temperature compensating SPR sensor, comprising:
a halogen broad spectrum light source for emitting light;
the double-channel optical fiber SPR sensor is connected with the halogen broad spectrum light source and is used for changing the wavelength of light according to the environment;
the quartz V-shaped groove plate is connected with the dual-channel optical fiber SPR sensor and is used for fixing optical fibers in the dual-channel optical fiber SPR sensor;
the spectrum analyzer is connected with the dual-channel optical fiber SPR sensor and is used for receiving the optical signals transmitted by the dual-channel optical fiber SPR sensor and converting the optical signals into electric signals;
and the computer is connected with the spectrum analyzer and is used for converting the electric signal into an analog signal and displaying the analog signal.
Preferably, the dual-channel optical fiber SPR sensor comprises a refractive index sensing channel and a temperature sensing channel;
the refractive index sensing channel is used for detecting the refractive index of the environment;
the temperature sensing channel is used for detecting the ambient temperature.
Preferably, when the dual-channel optical fiber SPR sensor is fixed by the quartz V-groove plate, ultraviolet glue is used for sticking the optical fiber into the V-groove.
Preferably, the optical fiber is polished by a four-corner grinder to obtain two side polished areas, a gold film is plated on one side polished area to obtain a refractive index sensing channel, and a gold film is plated on the other side polished area and a layer of polydimethylsiloxane is coated on the other side polished area to obtain a temperature sensing channel.
Preferably, the thickness of the gold film plated on the side polished area is 45nm.
Preferably, the optical fiber side polished surfaces of the refractive index sensing channel and the temperature sensing channel are positioned on the same plane with the quartz flat plate of the quartz V-groove piece.
Preferably, the halogen broad spectrum light source is connected with the dual-channel optical fiber SPR sensor through the SMA jumper connection adapter;
the other end of the double-channel optical fiber SPR sensor is connected with an SMA jumper wire connection spectrum analyzer through an adapter;
the spectrum analyzer is connected with the computer through a USB connecting wire.
Compared with the prior art, the application has the following advantages and technical effects:
the multi-side polishing temperature compensation SPR sensor based on the multimode fiber provided by the application effectively reduces uncertainty caused by temperature in refractive index measurement. The quartz V-groove piece prepared by the design can simultaneously perform multi-side polishing on the multimode optical fiber, and has the advantages of high processing speed and high success rate. The side polished surface of the processed optical fiber and the quartz plate are positioned on the same plane, which is beneficial to the processing of subsequent materials. And the quartz flat plate has good packaging effect on the optical fiber, and is more beneficial to practical application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a block diagram of a multimode fiber-based multi-side polishing temperature compensated SPR sensor in accordance with an embodiment of the present application;
FIG. 2 is a graph showing the change of the ambient refractive index of 1.335-1.375 at 25℃according to an embodiment of the present application;
FIG. 3 is a graph showing the change in ambient temperature between 35℃and 60℃for a refractive index of 1.355 according to an embodiment of the present application;
the device comprises a 1-halogen broad spectrum light source, a 2-quartz V groove plate, a 3-dual-channel optical fiber SPR sensor, a 4-spectrum analyzer, a 5-computer, a 301-refractive index sensing channel and a 302-temperature sensing channel.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Example 1
As shown in fig. 1, the application provides a double-side polishing temperature compensation type SPR sensor based on multimode optical fibers, which consists of a halogen broad spectrum light source 1, a quartz V-groove sheet 2, a double-channel optical fiber SPR sensor 3, a spectrum analyzer 4 and a computer 5. The dual-channel optical fiber sensor 2 consists of a refractive index sensing channel 301 and a temperature sensing channel 302, wherein the channel 301 consists of a gold film plated on a side polished surface of a D-type optical fiber, and the channel 302 consists of a gold film plated on the side polished surface of the D-type optical fiber and externally added Polydimethylsiloxane (PDMS). The incident light at the two channels, the spectrometer 4 receives the light signal and shows two independent formants on the computer 5 due to the different refractive indices of the environment on the surface gold film. Through setting up the degree of depth of quartz V groove array, bury the optic fibre in quartz V groove piece 2 and grind and throw, form two side throwing areas, quartz V groove flat board has not only increased the side throwing face of D type optic fibre and is convenient for the processing of follow-up material, and provides good encapsulation effect to breakable D type optic fibre. A 45nm gold film was plated on one side-polished area to form a refractive index sensing channel 301, and a 45nm gold film was plated on the other side-polished area and a layer of Polydimethylsiloxane (PDMS) was coated to form a temperature sensing channel 302. Because of the large refractive index of PDMS, the temperature measured formant wavelength is greater than the refractive index measured sensor formant wavelength. The two peaks are mutually independent, and disturbance influence of the temperature on the refractive index sensing area can be eliminated through compensation calculation by detecting the temperature and the refractive index at the same time, so that the refractive index measurement accuracy is improved.
It can be known by theory that: k (k) x And k sp Is defined by the formula:
where ω is the angular frequency of the incident light and c is the speed of the light in vacuum, about 3×10 8 m/s。ε co Is the dielectric constant of the fiber core,then is the effective refractive index, theta 1 Incident angle of incident light
ε m Dielectric constant of metal, epsilon 2 For the dielectric constant of the sample to be measured, k is the only time when the wave vector of the evanescent wave propagating along the interface of the metal medium is matched with the wave vector of the plasma wave x ＝k sp SPR is not activated until it is activated. From the above formula, it is known that the transmittance of the optical fiber SPR has a relation with the refractive index of the external environment, the dielectric constant of the metal and the thickness of the metal film, and the optimal thickness of the gold film is determined at 40-45nm through the simulation data of the Comsol software. The average sensitivity was 2276nm/RIU when the refractive index was varied from 1.335 to 1.375, and 1.72 nm/DEG C when the temperature detection range was varied from 40 to 1 () () DEGC
Definition of Deltalambda RI ＝λ 1 -λ 10 ，Δλ PDMS ＝λ 2 -λ 20 Δt=t-40, Δri=ri-1.335. Lambda in 1 And lambda is 2 For the measured resonance wavelengths of the two channels, T and RI are the actual temperature and the sample refractive index. Lambda (lambda) 10 Is 613.49nm, lambda of resonance wavelength corresponding to 1.335 refractive index matching liquid 20 Is 802.71nm which is 40 ℃ and corresponds to the resonance wavelength.
The wavelength variation of the two channels caused by refractive index and temperature can be expressed as:
will be tested inThe refractive index sensitivity S RI And temperature sensitivity S T Substituting the temperature and refractive index changes obtained after matrix operation into the above formula:
the temperature and refractive index change can be calculated through the expression, the temperature and refractive index double-parameter measurement based on the D-type optical fiber is achieved through the experiment, experimental data show that formant crosstalk cannot be generated between two formants in a proper range interval, and uncertainty caused by the temperature can be effectively reduced when the double-channel sensor is used for refractive index measurement.
Example 2
The multi-side polishing temperature compensation SPR sensor based on the multimode optical fiber consists of a halogen light source 1, a quartz V-groove flat plate 2, a double-channel optical fiber SPR sensor 3, a spectrum analyzer 4 and a computer 5. The system is characterized in that a 301 gold-plated film in the optical fiber SPR sensor 3 is used for detecting an ambient refractive index, a 302-area gold-plated film and a PDMS film are used for detecting an ambient temperature, a halogen light source 1 is connected into the optical fiber sensor 3 through an SMA jumper connection adapter, the other end of the system is connected into an SMA jumper connection spectrometer 4 through the adapter, and the system is connected into a computer 5 through a USB connection wire. When light is transmitted in the optical fiber sensor 3, an evanescent field is formed in the two sections of side polished areas and enters the metal film, and the evanescent field interacts with free electrons on the surface of the metal film to excite surface plasma waves transmitted along the interface between the metal and the medium. When the refractive index of the external environment is different, the resonance wavelength of the sensor is also different. Because of the large refractive index of PDMS, a formant is generated at a large wavelength. The output light signal of the sensor is received by the spectrometer and displayed on the computer application software, thereby monitoring the refractive index and temperature changes in the environment in real time. The V-groove quartz plate is used for controlling the depth, an optical fiber is glued into the V-groove by ultraviolet glue, and the optical fiber is placed in a four-corner grinding machine for grinding and polishing, so that two side polishing areas can be obtained simultaneously.
Fig. 2 shows that a gold film is coated on the side-polished area for refractive index measurement, and when the refractive index increases, the resonance wavelength of the channel 301 is red shifted and gradually increases toward the long wavelength. While the resonant wavelength of the channel 302 is almost unchanged.
Fig. 3 shows that when a PDMS film is coated on a side polished area by coating a gold film, the resonance wavelength of the channel 302 shifts blue when the temperature increases, while the resonance wavelength of the channel 301 is almost unchanged when the refractive index of the environment is unchanged.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (7)
1. A multimode fiber-based multi-side polishing temperature compensated SPR sensor comprising:
a halogen broad spectrum light source for emitting light;
the double-channel optical fiber SPR sensor is connected with the halogen broad spectrum light source and is used for changing the wavelength of light according to the environment;
the quartz V-shaped groove plate is connected with the dual-channel optical fiber SPR sensor and is used for fixing optical fibers in the dual-channel optical fiber SPR sensor;
the spectrum analyzer is connected with the dual-channel optical fiber SPR sensor and is used for receiving the optical signals transmitted by the dual-channel optical fiber SPR sensor and converting the optical signals into electric signals;
and the computer is connected with the spectrum analyzer and is used for converting the electric signal into an analog signal and displaying the analog signal.
2. The multimode fiber-based multi-side polishing temperature compensated SPR sensor of claim 1, wherein,
the dual-channel optical fiber SPR sensor comprises a refractive index sensing channel and a temperature sensing channel;
the refractive index sensing channel is used for detecting the refractive index of the environment;
the temperature sensing channel is used for detecting the ambient temperature.
3. The multimode fiber-based multi-side polishing temperature compensated SPR sensor of claim 1, wherein,
when the quartz V-groove plate is used for fixing the dual-channel optical fiber SPR sensor, ultraviolet glue is used for sticking the optical fiber into the V-groove.
4. The multimode fiber-based multi-side polishing temperature compensated SPR sensor of claim 1, wherein,
polishing the optical fiber through a four-corner grinder to obtain two side polishing areas, plating a gold film on one side polishing area to obtain a refractive index sensing channel, plating a gold film on the other side polishing area, and coating a layer of polydimethylsiloxane to obtain a temperature sensing channel.
5. The multimode fiber-based multi-side polishing temperature compensated SPR sensor of claim 4 wherein,
the thickness of the gold film plated on the side polished area is 45nm.
6. The multimode fiber-based multi-side polishing temperature compensated SPR sensor of claim 4 wherein,
the optical fiber side polished surfaces of the refractive index sensing channel and the temperature sensing channel are positioned on the same plane with the quartz flat plate of the quartz V-shaped groove piece.
7. The multimode fiber-based multi-side polishing temperature compensated SPR sensor of claim 1, wherein,
the halogen broad spectrum light source is connected with the dual-channel optical fiber SPR sensor through the SMA jumper connection adapter;
the other end of the double-channel optical fiber SPR sensor is connected with an SMA jumper wire connection spectrum analyzer through an adapter;
the spectrum analyzer is connected with the computer through a USB connecting wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310582906.8A CN116593425A (en) | 2023-05-23 | 2023-05-23 | Multi-side polishing temperature compensation SPR sensor based on multimode optical fiber |
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| CN202310582906.8A CN116593425A (en) | 2023-05-23 | 2023-05-23 | Multi-side polishing temperature compensation SPR sensor based on multimode optical fiber |
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| CN202310582906.8A Pending CN116593425A (en) | 2023-05-23 | 2023-05-23 | Multi-side polishing temperature compensation SPR sensor based on multimode optical fiber |
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