CN216746487U - Double-parameter optical fiber sensor with cascaded microsphere cavities - Google Patents
Double-parameter optical fiber sensor with cascaded microsphere cavities Download PDFInfo
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- CN216746487U CN216746487U CN202220495228.2U CN202220495228U CN216746487U CN 216746487 U CN216746487 U CN 216746487U CN 202220495228 U CN202220495228 U CN 202220495228U CN 216746487 U CN216746487 U CN 216746487U
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- 239000004005 microsphere Substances 0.000 title claims abstract description 41
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000010931 gold Substances 0.000 claims abstract description 11
- 229910052737 gold Inorganic materials 0.000 claims abstract description 11
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 claims abstract description 11
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- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims abstract description 11
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Abstract
The utility model provides a double-parameter optical fiber sensor of a cascade microsphere cavity, belonging to the field of optical fiber sensing; the utility model comprises a laser, a D-type optical fiber coupling mixed medium cavity system and a spectrum detector. The light emitted from the laser is coupled with a mixed medium cavity formed by two coating film microspheres through a D-shaped optical fiber, a whispering gallery mode is generated in the microspheres through continuous total internal reflection, and when the external environment changes, the resonant wavelength of the light in the mixed medium cavity changes along with the light; the spectrum detector is used for recording the transmission spectrum of the light output by the tail end of the optical fiber after passing through the sensing system; the mixed medium cavity is composed of quartz microsphere coating films, wherein one microsphere coating gold film is used for refractive index sensing, and the other microsphere coating PDMS film is used for temperature sensing. The utility model has the characteristics of simple structure, low cost, strong practicability and the like, and has wide application prospect in the aspect of biochemical sensing.
Description
Technical Field
The utility model belongs to the field of optical fiber sensing, and particularly relates to a double-parameter optical fiber sensor of a cascade microsphere cavity.
Background
Due to the unique characteristics (such as small mode volume and ultrahigh quality factor), the optical whispering gallery mode microcavity has wide application prospect in the fields of low-threshold laser, optical sensing and the like. The basic principle is that when light propagates in the annular medium cavity, when the refractive index of the medium cavity is larger than that of the external environment, the light entering the micro-cavity through the coupling device is limited in the cavity, and is totally reflected for many times at the boundary, and if the light returns to the original point and meets the phase matching condition, stable resonance is formed, and a whispering gallery mode is generated.
The surface plasmon resonance effect is a physical optical phenomenon. The method uses evanescent waves which permeate into the metal film when the light is subjected to total internal reflection at the interface of the glass and the metal film to initiate free electrons in the metal to generate surface plasma. The combination of the dielectric microcavity and the metal layer allows the interaction of the resonating light with the surface plasmons, creating new phenomena such as mixed photon-surface plasmon modes. In these surface plasmon microcavities, the metal layer coated on the microcavity can confine the strong electromagnetic field of the surface plasmon on the metal surface, which can be used to enhance the interaction of light and substances. In the hybrid photon-surface plasmon mode, energy is partially stored in the optical field located within the dielectric cavity and in the surface plasmon field located at the metal coating.
Refractive index measurement plays a crucial role in many fields, such as biosensors and chemical sensors, because it is directly related to the concentration of an analyte. In the past decades, optical fiber refractive index sensors based on the surface plasmon resonance effect have attracted more and more attention due to their outstanding advantages of high sensitivity, compact structure, fast response speed, electromagnetic interference resistance, etc., and are widely used in the application fields of biosensing and chemical sensing. However, it is well known that the refractive index of a material is always closely related to the ambient temperature. In practice, the constant temperature is difficult to keep in the refractive index measurement process, the constant temperature of a measured object in the measurement process is difficult to guarantee, temperature compensation is carried out by simultaneously measuring the refractive index and the temperature, and the measured refractive index result has large deviation from the actual refractive index. Since the resonance wavelength is difficult to adjust, there is still a certain difficulty in measuring both the refractive index and the temperature.
Disclosure of Invention
The utility model provides a double-parameter optical fiber sensor of a cascade microsphere cavity, which aims to overcome the defects of the existing optical fiber sensing technology on multi-parameter sensing and solve the influence of temperature change on the research of refractive index sensing.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the double-parameter optical fiber sensor of the cascade microsphere cavity is characterized in that: the device comprises a laser (1), a D-type optical fiber coupling mixed medium cavity system (2) and a spectrum detector (3).
The D-type optical fiber coupling mixed medium cavity system (2) comprises a D-type optical fiber (4), a first mixed medium cavity (5) and a second mixed medium cavity (6).
And the D-shaped optical fiber (4) is subjected to side polishing to remove part of cladding, so that the obtained D-shaped optical fiber (4) only comprises a concave cladding (4-1) and a bare optical fiber core (4-2).
The first mixed medium cavity (5) is formed by coating a gold film (5-2) on the outer surface of a first microsphere (5-1), and the second mixed medium cavity (6) is formed by coating a PDMS film (6-2) on the outer surface of a second microsphere (6-1).
Light emitted by the laser enters the D-type optical fiber and is coupled with the mixed medium cavity system (2), and then the spectrum is received by the spectrum detector. The first mixed medium cavity (5) and the second mixed medium cavity (6) are composed of first microspheres (5-1) coated with gold films (5-2) and second microspheres (6-1) coated with PDMS films (6-2), the first microspheres and the second microspheres are connected to an optical fiber core (4-2) of a D-type optical fiber (4) with a concave cladding (4-1), when light output by a laser passes through the D-type optical fiber coupling mixed medium cavity system (2), the function of sensing and detecting the refractive index and the temperature can be independently realized, and the change of an optical field can be detected from the spectral detector (3). When the sensor is used for measuring the refractive index, a gold film (5-2) is coated on a first microsphere (5-1) to manufacture a microcavity which has high-quality factor values and strong evanescent waves, a whispering gallery mode is generated by continuous total reflection in the first microsphere (5-1) to enable the microcavity to have the high-quality factor values, and the whispering gallery mode in the microsphere (5-1) is combined with a surface plasma effect generated on the gold film (5-2) to enhance the evanescent field of a resonant cavity, so that the sensitivity is improved; when the temperature is measured, the PDMS film (6-2) sensitive to the temperature is coated on the second microsphere (6-1), and when the light in the D-type optical fiber (4) enters the second microsphere (6-1), the PDMS film (6-2) can detect the tiny change of the temperature. The utility model has the characteristics of simple structure, low cost, strong practicability and the like, and has wide application in the aspect of biochemical sensing.
The double-parameter optical fiber sensor of the cascade microsphere cavity provided by the utility model overcomes the defects of the existing optical fiber sensing technology on multi-parameter sensing, and solves the influence of temperature change on the research of refractive index sensing.
Compared with the prior art, the technical scheme adopted by the utility model has the following advantages:
1. according to the utility model, the gold film (5-2) is coated on the outer surface of the first microsphere (5-1) to form the first mixed medium cavity (5), so that the first mixed medium cavity has a higher quality factor value, and the optical field in the first microsphere (5-1) has a stronger evanescent field under the enhancement of the surface plasma effect of the gold film (5-2), so that the interaction time and strength of the optical field and the external environment are enhanced, and higher sensitivity is finally realized.
2. According to the utility model, the PDMS film (6-2) is coated on the outer surface of the second microsphere (6-1) to form the second mixed medium cavity (6), and the PDMS film (6-2) is sensitive to temperature change, so that the micro temperature change can be sensitively detected in the aspect of temperature sensing research.
3. The utility model adopts the method of connecting the first mixed medium cavity (5) and the second mixed medium cavity (6) on the D-type optical fiber, thereby independently realizing double-parameter sensing, and because the resonant wavelength ranges of the two mixed medium cavities are different, the two mixed medium cavities can not form wavelength crosstalk mutually, and the influence of temperature disturbance on the research of refractive index sensing is avoided while the refractive index sensing is carried out.
4. The utility model has the characteristics of simple structure, low cost, strong practicability and the like, and has wide application prospect in the aspect of biochemical sensing.
Drawings
FIG. 1 is a schematic diagram of a dual-parameter fiber sensor measuring device with cascaded microsphere cavities.
FIG. 2 is a schematic side sectional view of a two-parameter fiber sensor structure with cascaded microsphere cavities.
Detailed Description
The following description will further describe the specific embodiments of the present invention with reference to the accompanying drawings.
The utility model relates to a double-parameter optical fiber sensor of a cascade microsphere cavity, which is characterized in that: the device comprises a laser (1), a D-type optical fiber coupling mixed medium cavity system (2) and a spectrum detector (3).
And the D-type optical fiber (4) is subjected to side polishing to remove part of the cladding, so that the obtained D-type optical fiber (4) only comprises a concave cladding (4-1) and a bare fiber core (4-2).
The first mixed medium cavity (5) is formed by coating a gold film (5-2) on the outer surface of a first microsphere (5-1), and the second mixed medium cavity (6) is formed by coating a PDMS film (6-2) on the outer surface of a second microsphere (6-1).
The detection mechanism is as follows: light in the laser (1) passes through a D-type optical fiber coupling mixed medium cavity system (2), a whispering gallery mode is generated in the first microsphere (5-1) and the second microsphere (5-2) through continuous total internal reflection, and due to the fact that different film layers are coated, when the external environment changes, light fields in the first mixed medium cavity (5) and the second mixed medium cavity (6) can correspondingly generate certain wavelength drift, and therefore the sensing function of the external environment is achieved; the spectrum detector (3) is used for recording the transmission spectrum of the output light of the end of the optical fiber after the light passes through the coupling system of the two microspheres and the optical fiber. In the research of refractive index sensing, a first microsphere (5-1) is coated with a gold film (5-2) to form a first mixed medium cavity (5) which is placed in liquids with different refractive indexes for experiments, a spectrum detector (3) is used for receiving changed optical signals, the echo wall mode resonant cavity has higher quality factor values due to continuous total internal reflection, an evanescent field is enhanced due to the surface plasma resonance effect after the gold film (5-2) is coated, the interaction time of the resonant cavity and the external environment is prolonged at the same time, the photon life is prolonged, and the sensitivity is enhanced; in a temperature sensing experiment, the second microspheres (6-1) are coated with the PDMS film (6-2) to form a second mixed medium cavity (6), and the PDMS film (6-2) is sensitive to temperature change, so that tiny temperature fluctuation can be detected, and a spectrum detector (3) can be used for receiving a changed optical signal under the condition of environmental temperature change. By measuring the refractive index and the temperature simultaneously, the influence of temperature disturbance can be eliminated, thereby finally improving the measurement precision of the refractive index. The spectral detector is used for detecting the spectral wavelength change in the coupling system caused by the environmental refractive index and the temperature change, so that the refractive index and the temperature can be accurately sensed.
Claims (3)
1. A dual-parameter optical fiber sensor of a cascade microsphere cavity is characterized in that: the device comprises a laser (1), a D-type optical fiber coupling mixed medium cavity system (2) and a spectrum detector (3); the D-type optical fiber coupling mixed medium cavity system (2) comprises a D-type optical fiber (4), a first mixed medium cavity (5) and a second mixed medium cavity (6).
2. The dual parameter fiber optic sensor of a cascaded microsphere cavity of claim 1, wherein: and the D-type optical fiber (4) is subjected to side polishing to remove part of the cladding, so that the obtained D-type optical fiber (4) only comprises a concave cladding (4-1) and a bare fiber core (4-2).
3. The dual parameter fiber optic sensor of a cascaded microsphere cavity of claim 1, wherein: the first mixed medium cavity (5) is formed by coating a gold film (5-2) on the outer surface of a first microsphere (5-1), and the second mixed medium cavity (6) is formed by coating a PDMS film (6-2) on the outer surface of a second microsphere (6-1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220495228.2U CN216746487U (en) | 2022-03-07 | 2022-03-07 | Double-parameter optical fiber sensor with cascaded microsphere cavities |
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| CN202220495228.2U CN216746487U (en) | 2022-03-07 | 2022-03-07 | Double-parameter optical fiber sensor with cascaded microsphere cavities |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114485985A (en) * | 2022-04-01 | 2022-05-13 | 哈尔滨理工大学 | Double-parameter optical fiber sensor with cascaded microsphere cavities |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114485985A (en) * | 2022-04-01 | 2022-05-13 | 哈尔滨理工大学 | Double-parameter optical fiber sensor with cascaded microsphere cavities |
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Granted publication date: 20220614 |