CN212963766U - Ethanol-filled negative-curvature optical fiber single-polarization temperature sensor - Google Patents
Ethanol-filled negative-curvature optical fiber single-polarization temperature sensor Download PDFInfo
- Publication number
- CN212963766U CN212963766U CN202021695123.9U CN202021695123U CN212963766U CN 212963766 U CN212963766 U CN 212963766U CN 202021695123 U CN202021695123 U CN 202021695123U CN 212963766 U CN212963766 U CN 212963766U
- Authority
- CN
- China
- Prior art keywords
- quartz glass
- elliptical
- glass tubes
- elliptical quartz
- ethanol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The utility model discloses an ethanol-filled negative curvature optical fiber single polarization temperature sensor, which comprises a cladding region and a core region; the cladding region comprises 8 uniformly distributed elliptical quartz tubes, the long axis in each elliptical quartz glass tube is d1, and the short axis in each elliptical quartz glass tube is d 2; the thicknesses of the elliptical quartz glass tubes are all t; an included angle between every two adjacent elliptic quartz glass tubes is 44.5-45.5 degrees; wherein 6 filling materials of the elliptical quartz glass tubes are ethanol, and 2 filling materials of the elliptical quartz glass tubes are gold; 3 elliptical quartz glass tubes filled with ethanol are arranged between 2 elliptical quartz glass tubes filled with gold at intervals, and the centers of the 2 elliptical quartz glass tubes filled with gold and the circle center of the optical fiber are on the same straight line; the core area is an area surrounded by 8 elliptical quartz glass tubes; the measured range of the sensor is 20 ℃ to 70 ℃, and the sensitivity reaches 3.03 nm/DEG C. Temperature has a good linear relationship with wavelength.
Description
Technical Field
The utility model relates to an optical fiber sensor field, in particular to negative curvature optic fibre single polarization temperature sensor is filled to ethanol.
Background
Optical fibers have been widely used in the field of information transmission and sensing as a new generation of transmission media. Currently, fiber optic sensors have been used to sense a variety of physical quantities. Such as temperature, refractive index, pressure, etc. Among the above sensors, the temperature sensor plays an indispensable role in daily life and production of people. At present, the methods for sensing temperature by using optical fibers mainly include:
based on the traditional optical fiber, the traditional optical fiber is subjected to tapering or the cladding of the optical fiber is thinned, so that the fiber core is more fully contacted with the external environment. Therefore, the external environment can severely influence the transmission of the mode in the fiber core, and different temperatures have different influences on the transmission of the fiber mode, so that the temperature sensing is realized. However, in this case, the optical fiber becomes extremely fragile and easily broken.
Based on the photonic crystal fiber, the photonic crystal fiber is an optical fiber with a cladding layer containing periodically arranged microstructure holes. And can be classified into total internal reflection type photonic crystal fibers and photonic band gap type photonic crystal fibers according to the light guiding principle. The total internal reflection photonic crystal fiber has a core formed by missing air holes because the cladding contains microstructured holes, and the average refractive index of the cladding is lower than that of the core, so that light can propagate in the core. The light guide mechanism of the photonic band gap type photonic crystal fiber is a photonic band gap effect, the cladding of the photonic band gap type photonic crystal fiber is composed of air holes which are densely and strictly arranged, a photonic band effect is formed, and a defect state (generally a large air hole) is introduced through the center, so that some light in the photonic band gap of the cladding can be transmitted in the air hole at the center. However, because the photonic crystal fiber has a very complicated structure, the number of the air holes is usually hundreds or thousands, and the diameter of the air holes is usually only a few micrometers, the processing of the photonic crystal fiber is difficult, and the success rate is low.
The fiber grating is formed by periodically modulating the refractive index of the fiber core in the axial direction by a certain method. The effective refractive index of the grating period and the grating region can be influenced by the external environment, and according to the principle, the fiber grating can also sense the temperature. But the temperature sensitivity of fiber gratings is generally low.
SUMMERY OF THE UTILITY MODEL
To solve the above technical problem, an object of the present invention is to provide an ethanol-filled negative curvature optical fiber single polarization temperature sensor to at least solve one of the above-mentioned technical problems, specifically as follows.
An ethanol-filled negative-curvature fiber single-polarization temperature sensor, comprising: a cladding region and a core region; the cladding region comprises 8 uniformly distributed elliptical quartz tubes, the long axis in each elliptical quartz glass tube is d1, and the short axis in each elliptical quartz glass tube is d 2; the thicknesses of the elliptical quartz glass tubes are all t; an included angle between every two adjacent elliptic quartz glass tubes is 44.5-45.5 degrees; wherein 6 filling materials of the elliptical quartz glass tubes are ethanol, and 2 filling materials of the elliptical quartz glass tubes are gold; 3 elliptical quartz glass tubes filled with ethanol are arranged between 2 elliptical quartz glass tubes filled with gold at intervals, and the centers of the 2 elliptical quartz glass tubes filled with gold and the circle center of the optical fiber are on the same straight line; the core area is an area surrounded by 8 elliptical quartz glass tubes. The linear fitting equation of the wavelength position y where the loss peak of the sensor is located and the corresponding temperature x meets the following relation: y 0.00303x + 1.52605.
Optionally, the degree of fitting R of the linear fitting equation2Is 0.99889.
Optionally, the range of the long axis d1 in the elliptical quartz glass tube is as follows: 34-36 μm.
Optionally, the range of the minor axis d2 in the elliptical quartz glass tube is as follows: 20-22 μm.
Optionally, the range of the thickness t of the elliptical quartz glass tube is as follows: 0.4-0.6 μm.
Optionally, the range of the thickness t of the elliptical quartz glass tube is as follows: 0.4-0.6 μm.
Optionally, an included angle between adjacent elliptical quartz glass tubes is 45 degrees.
Optionally, the range of the fiber radius R is: 69-71 μm.
Optionally, the filling material of the core region is ethanol.
Compared with the prior art, the utility model, following technological effect has:
the utility model provides an ethanol-filled negative curvature optical fiber single polarization temperature sensor, which comprises 8 elliptical quartz tubes which are uniformly distributed, and an included angle between every two adjacent elliptical quartz glass tubes is 44.5-45.5 degrees; and 6 filling materials of the elliptical quartz glass tubes are ethanol, and 2 filling materials of the elliptical quartz glass tubes are gold. The measured range of the sensor is 20 ℃ to 70 ℃, and the sensitivity reaches 3.03 nm/DEG C. The temperature and the wavelength have good linear relation and the fitting degree R20.99889 is reached. In the temperature measuring range, only the x polarization state of the fiber core mode is used for sensing, so that the interference of the y polarization state of the core mold in practical application to a sensing result is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a cross-sectional view of the ethanol-filled negative curvature optical fiber single polarization temperature sensor of the present invention.
Fig. 2 is a graph showing the relationship between the effective refractive index of the ethanol-filled negative-curvature optical fiber single-polarization temperature sensor and the wavelength at 20 ℃.
Fig. 3 is a graph showing the variation of loss with wavelength at 20 ℃ of the ethanol-filled negative-curvature optical fiber single-polarization temperature sensor of the present invention.
Fig. 4 is a graph showing the relationship between the loss and the wavelength of the ethanol-filled negative-curvature optical fiber single-polarization temperature sensor of the present invention at 20-70 ℃.
Fig. 5 is a linear fitting graph of wavelength position of loss peak of the ethanol-filled negative-curvature fiber single-polarization temperature sensor along with temperature.
In FIG. 1, 8 elliptical quartz glass tubes having a thickness t, a length of the inner major axis d1 and a length of the inner minor axis d2 are shown as 1 to 8. Wherein the insides of the oval quartz glass tubes 4 and 8 are filled with gold, and the insides of the tubes 4 and 8 are completely filled with gold. The inside of the oval quartz glass tube 1, 2, 3, 5, 6, 7 and the rest of the entire fiber interior (9 in fig. 1) are completely filled with ethanol.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an ethanol-filled negative-curvature optical fiber single-polarization temperature sensor includes: a cladding region and a core region; the cladding region comprises 8 uniformly distributed elliptical quartz tubes, the long axis in each elliptical quartz glass tube is d1, and the short axis in each elliptical quartz glass tube is d 2; the thicknesses of the elliptical quartz glass tubes are all t; an included angle between every two adjacent elliptic quartz glass tubes is 44.5-45.5 degrees; wherein 6 filling materials of the elliptical quartz glass tubes are ethanol, and 2 filling materials of the elliptical quartz glass tubes are gold; 3 elliptical quartz glass tubes filled with ethanol are arranged between 2 elliptical quartz glass tubes filled with gold at intervals, and the centers of the 2 elliptical quartz glass tubes filled with gold and the circle center of the optical fiber are on the same straight line; the core area is an area surrounded by 8 elliptical quartz glass tubes.
Optionally, the range of the long axis d1 in the elliptical quartz glass tube is as follows: 34-36 μm. The range of the minor axis d2 in the elliptical quartz glass tube is as follows: 20-22 μm. The value of the elliptical quartz glass tube in the numerical range can ensure that the sensor has stronger sensitivity, can accurately detect the change of temperature, and the sensitivity reaches 3.03 nm/DEG C.
The range of the thickness t of the elliptical quartz glass tube is as follows: 0.4-0.6 μm. The value of the elliptical quartz glass tube in the numerical range can ensure that the sensor has stronger sensitivity, can accurately detect the change of temperature, and the sensitivity reaches 3.03 nm/DEG C.
And an included angle between every two adjacent elliptical quartz glass tubes is 45 degrees. The value of the elliptical quartz glass tube in the numerical range can ensure that the sensor has stronger sensitivity, can accurately detect the change of temperature, and the sensitivity reaches 3.03 nm/DEG C.
The range of fiber radii R is: 69-71 μm. The value of the radius of the optical fiber in the numerical range can effectively receive incident light, and the polarization base film of the optical fiber can be transmitted at the fiber core of the optical fiber, thereby being beneficial to detecting the temperature signal carried by the optical signal.
The utility model provides an ethanol-filled negative curvature optical fiber single polarization temperature sensor, which comprises 8 elliptical quartz tubes which are uniformly distributed, and an included angle between every two adjacent elliptical quartz glass tubes is 44.5-45.5 degrees; and 6 filling materials of the elliptical quartz glass tubes are ethanol, and 2 filling materials of the elliptical quartz glass tubes are gold. The measured range of the sensor is 20 ℃ to 70 ℃, and the sensitivity reaches 3.03 nm/DEG C. The temperature has good linear relation with the wavelength, and the fitting parameter R20.99889 is reached. Under testIn the temperature range, only the x polarization state of the fiber core mode is used for sensing, so that the interference of the y polarization state of the core mold in practical application on a sensing result is avoided.
As shown in fig. 1, 1-8 are 8 elliptical quartz glass tubes. Wherein the insides of the oval quartz glass tubes 4 and 8 are filled with gold, for example, gold wire, and the gold wire completely fills the insides of the tubes 4 and 8. The inside of the oval quartz glass tube 1, 2, 3, 5, 6, 7 and the rest 9 of the entire fiber interior are completely filled with ethanol. The core area is a central area enclosed by the oval quartz glass tubes 1-8. Because the refractive index of ethanol is lower than that of quartz in the range measured, the light guiding mechanism of the fiber is not total internal reflection. This temperature sensor also has no photonic bandgap structure and is therefore not a light guiding mechanism for photonic bandgaps. The light guiding mechanism of this temperature sensor is anti-resonance. The insides of the elliptical quartz glass tubes 4 and 8 are filled with gold, when light is emitted into the optical fiber, the elliptical quartz glass tubes 4 and 8 respectively generate respective surface plasma modes, and according to a coupled mode theory, mode coupling effect can occur between the respective surface plasma modes in the elliptical quartz glass tubes 4 and 8, so that a surface plasma supermode is formed. And 4 and 8 are elliptical, so that the formed surface plasma supermode has high birefringence. The birefringence of the core mode is small, so that only the x-polarization state of the core mode and the surface plasmon supermode have SPR effect in the measured range.
The SPR is Surface Plasmon Resonance (SPR), a sensitive surface analysis technique, and is a technique for detecting changes in dielectric constant caused by molecules adsorbed on a heavy metal film.
Therefore, there are 2 light guiding mechanisms in the fiber, namely, the anti-resonance mechanism of the fundamental mode of the fiber core and the light guiding mechanism of the surface plasmon supermode formed by the surface plasmon modes in 4 and 8.
Fig. 2 is a graph showing the relationship between the refractive index of the fiber core fundamental mode x polarization state and the mode of the fiber core fundamental mode y polarization state and the refractive index of the surface plasmon supermode with the change of the wavelength, for example, when the temperature of the ethanol-filled negative-curvature fiber single-polarization temperature sensor is 20 ℃. As can be seen from FIG. 2, the effective refractive index of the y-polarization mode does not generate SPR effect with the 0 th order surface plasmon supermode in the measured wavelength range, while the effective refractive index of the x-polarization mode and the 0 th order surface plasmon supermode generate SPR effect at the wavelength of 1.584 micrometers. The other temperatures are the same mechanism as at 20 ℃ except that the wavelength at which the SPR effect occurs changes.
Fig. 3 is a graph showing the variation of the loss of the fiber core fundamental mode x polarization state and the loss of the fiber core fundamental mode y polarization state with the wavelength of the single polarization temperature sensor filled with ethanol, which is taken as an example at 20 ℃. It can be seen from fig. 3 that the x-polarization mode shows a loss peak at a wavelength of 1.584 μm, while the y-polarization mode has a very low loss. Fig. 2 and 3 are in a corresponding relationship with each other. The other temperature conditions were the same mechanism as at 20 ℃ except that the wavelength position of the loss peak was changed.
Fig. 4 is the relationship between the loss and the wavelength of the ethanol-filled negative-curvature optical fiber single-polarization temperature sensor of the present invention at 20-70 ℃. As the temperature increases, the loss peak is red-shifted and the loss increases.
Fig. 5 is a linear fitting graph of the wavelength position of the loss peak with temperature when the negative curvature optical fiber single polarization temperature sensor is filled with ethanol. Fig. 4 and 5 are related to each other. As can be seen from FIG. 5, the linear fitting equation result of the temperature sensor, the wavelength position of the loss peak and the corresponding temperature is that y is 0.00303x +1.52605, x represents the temperature, y represents the wavelength value of the loss peak, and the slope represents the sensitivity of the optical fiber at 0.00303 μm/deg.C (3.03 nm/deg.C), wherein the fitting parameter R is20.99889 was reached, representing good linearity.
As a representative ethanol-filled negative curvature fiber single polarization temperature sensor, the following was implemented:
the first embodiment is as follows: the major half axis d1 of the 8 elliptical quartz glass tubes is 34 μm. The short half shaft d2 in the 8 elliptic quartz glass tubes is 20 μm. The thickness t of the 8 oval quartz glass tubes is 0.4 μm. The included angle between the adjacent tube rings among the 8 elliptical quartz glass is 44.5 degrees. The fiber radius R is 69 μm.
Example two: the major half axis d1 of the 8 elliptical quartz glass tubes is 36 μm. The minor half axis d2 in the 8 elliptical quartz glass tubes is 22 μm. The thickness t of the 8 oval quartz glass tubes is 0.6. mu.m. The included angle between the adjacent tube rings among the 8 elliptical quartz glass is 45.5 degrees. The fiber radius R is 71 μm.
Example three: the major half axis d1 of the 8 elliptical quartz glass tubes is 35 μm. The short half shaft d2 in the 8 elliptic quartz glass tubes is 21 μm. The thickness t of the 8 oval quartz glass tubes is 0.5 μm. The included angle between the adjacent pipe rings between 8 elliptical quartz glass is 45 degrees. The fiber radius R is 70 μm.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. An ethanol-filled negative-curvature optical fiber single-polarization temperature sensor is characterized by comprising: a cladding region and a core region;
the cladding region comprises 8 uniformly distributed elliptical quartz glass tubes, wherein the long axis in each elliptical quartz glass tube is d1, and the short axis in each elliptical quartz glass tube is d 2; the thicknesses of the elliptical quartz glass tubes are all t; an included angle between every two adjacent elliptic quartz glass tubes is 44.5-45.5 degrees; wherein 6 filling materials of the elliptical quartz glass tubes are ethanol, and 2 filling materials of the elliptical quartz glass tubes are gold; 3 elliptical quartz glass tubes filled with ethanol are arranged between 2 elliptical quartz glass tubes filled with gold at intervals, and the centers of the 2 elliptical quartz glass tubes filled with gold and the circle center of the optical fiber are on the same straight line;
the core area is an area surrounded by 8 elliptical quartz glass tubes;
the linear fitting equation of the wavelength position y where the loss peak of the sensor is located and the corresponding temperature x meets the following relation: y 0.00303x + 1.52605.
2. The sensor of claim 1, wherein: degree of fit R of the linear fitting equation2Is 0.99889.
3. The sensor of claim 1, wherein: the range of the long axis d1 in the elliptical quartz glass tube is as follows: 34-36 μm.
4. The sensor of claim 1, wherein: the range of the minor axis d2 in the elliptical quartz glass tube is as follows: 20-22 μm.
5. The sensor of claim 1, wherein: the range of the thickness t of the elliptical quartz glass tube is as follows: 0.4-0.6 μm.
6. The sensor of claim 1, wherein: the range of the thickness t of the elliptical quartz glass tube is as follows: 0.4-0.6 μm.
7. The sensor of claim 1, wherein: and an included angle between every two adjacent elliptical quartz glass tubes is 45 degrees.
8. The sensor of claim 1, wherein: the range of fiber radii R is: 69-71 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021695123.9U CN212963766U (en) | 2020-08-14 | 2020-08-14 | Ethanol-filled negative-curvature optical fiber single-polarization temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021695123.9U CN212963766U (en) | 2020-08-14 | 2020-08-14 | Ethanol-filled negative-curvature optical fiber single-polarization temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212963766U true CN212963766U (en) | 2021-04-13 |
Family
ID=75352506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021695123.9U Active CN212963766U (en) | 2020-08-14 | 2020-08-14 | Ethanol-filled negative-curvature optical fiber single-polarization temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212963766U (en) |
-
2020
- 2020-08-14 CN CN202021695123.9U patent/CN212963766U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| He et al. | Polymer optical fiber liquid level sensor: A review | |
| US6301420B1 (en) | Multicore optical fibre | |
| CN100367016C (en) | Fibre-optical temperature measuring device and measurement thereof | |
| CN102829893B (en) | Method for simultaneously measuring temperature and stress of fiber bragg gratings (obtained by corrosion) with different diameters | |
| Zhao et al. | Hybrid fiber-optic sensor for seawater temperature and salinity simultaneous measurements | |
| Fu et al. | Novel fiber grating for sensing applications | |
| Xu et al. | Ultrasensitive broadband refractometer based on single stress-applying fiber at dispersion turning point | |
| Hu et al. | A narrow groove structure based plasmonic refractive index sensor | |
| Qi et al. | A novel high sensitivity refractive index sensor based on multi-core micro/nano fiber | |
| CN111947805A (en) | Ethanol-filled negative-curvature optical fiber single-polarization temperature sensor | |
| Ma et al. | Refractometer based on fiber Mach-Zehnder interferometer composed of two micro bending cores | |
| Lei et al. | Ultrasensitive refractive index sensor based on Mach–Zehnder interferometer and a 40μm fiber | |
| Bao et al. | Investigation of long period grating imprinted on a plastic optical fiber for liquid level sensing | |
| Vaziri et al. | Optical-fiber strain sensors with asymmetric etched structures | |
| Zhu et al. | High sensitivity curvature sensor based on a double-sphere tapered no-core fiber Mach–Zehnder interferometer | |
| Guo et al. | A new bamboo-shaped sensor for curvature measurement with microstructured fiber | |
| CN212963766U (en) | Ethanol-filled negative-curvature optical fiber single-polarization temperature sensor | |
| Zhao et al. | Ultra-short fiber Bragg grating composed of cascaded microchannels in a microprobe for refractive index measurement | |
| CN114111857A (en) | Vernier effect based optical fiber FPI cascaded MI sensing device | |
| Chen et al. | Temperature-insensitive gas pressure sensor based on photonic crystal fiber interferometer | |
| Deng et al. | Twisted tapered plastic optical fibers for continuous liquid level sensing | |
| Hou et al. | Intensity modulated gas RI sensor based on inornate antiresonant hollow-core fiber with ultrahigh sensitivity | |
| Wang et al. | High-sensitivity liquid level sensor based on the balloon-shaped fiber optic MZI | |
| Kaiser et al. | Measurement of spectral total and scattering losses in unclad optical fibers | |
| Kim et al. | Temperature-Insensitive Refractometer Based on a Wave-Shaped Fiber Modal Interferometer Using No-Core Fiber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |