CN210141872U - Optical fiber temperature and refractive index sensor based on hollow optical fiber and FBG - Google Patents
Optical fiber temperature and refractive index sensor based on hollow optical fiber and FBG Download PDFInfo
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- CN210141872U CN210141872U CN201921028441.7U CN201921028441U CN210141872U CN 210141872 U CN210141872 U CN 210141872U CN 201921028441 U CN201921028441 U CN 201921028441U CN 210141872 U CN210141872 U CN 210141872U
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Abstract
The utility model provides an optic fibre temperature and refractivity sensor based on hollow optic fibre and FBG, it comprises broadband light source, incident single mode fiber, hollow optic fibre, micropore, FBG, outgoing single mode fiber, spectrum appearance. When liquid enters the hollow-core optical fiber through the small holes on the side wall of the hollow-core optical fiber, the spectrum changes. Since FBGs are temperature sensitive, their center wavelength shifts when the external temperature changes. The environmental temperature can be measured by moving the central wavelength of the FBG, and the liquid refractive index can be measured by the wavelength change value of the Fabry-Perot interference spectrum on the spectrometer, so that the temperature and the refractive index can be measured simultaneously on one sensing head. The sensor has the advantages of high sensitivity, simple manufacture, low cost and the like.
Description
Technical Field
The utility model relates to an optical fiber sensor especially relates to an optic fibre temperature and refractivity sensor based on hollow optic fibre and FBG.
Background
The optical fiber refractive index sensors can be mainly divided into two categories, one is an optical fiber grating refractive index sensor, and the other is an optical fiber grating refractive index sensor which comprises FBGs (fiber Bragg gratings), long-period optical fiber gratings and inclined optical fiber gratings; another class is refractive index sensors based on the interferometric type, including F-P structures, single-mode-multi-mode-single-mode structures. Such as a tapered polarization maintaining fiber refractive index sensor; however, the sensor uses polarization maintaining fiber, which has higher price than common single mode fiber and hollow fiber, so the cost of this type of sensor is higher. The refractive index of a liquid is inevitably affected by temperature, and therefore an accurate measurement of the refractive index must be made simultaneously with the measurement of the temperature. At present, sensors for respectively measuring the refractive index and the temperature are available on the market, but the sensors are not small enough in size and inconvenient to use.
Disclosure of Invention
The utility model discloses the purpose is in order to overcome the problem of above-mentioned production, satisfies actual work demand, provides an optic fibre temperature and refractive index sensor based on hollow optic fibre and FBG, and this sensor has sensitivity height, makes simply, advantage such as with low costs.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: an optical fiber temperature and refractive index sensor based on a hollow optical fiber and an FBG (fiber Bragg Grating) comprises a broadband light source (1), an incident single-mode optical fiber (2), a hollow optical fiber (3), a small hole (4), an FBG (5), an emergent single-mode optical fiber (6) and a spectrometer (7); the output end of the broadband light source (1) is connected with the left end of the incident single-mode fiber (2), the right end of the incident single-mode fiber (2) is connected with the left end of the hollow-core fiber (3), the right end of the hollow-core fiber (3) is connected with the left end of the FBG (5), the right end of the FBG (5) is connected with the left end of the emergent single-mode fiber (6), and the right end of the emergent single-mode fiber (6) is connected with the spectrometer (7); the FBG is characterized in that the right end of the hollow optical fiber (3) is connected with the left end of the FBG (5), and a small hole (4) is formed in the side wall of the hollow optical fiber (3).
The wavelength range of the broadband light source (1) is 1460nm-1620 nm.
The hollow core optical fiber (3) of the utility model has an inner diameter of 80 μm, a cladding diameter of 125 μm, a length of 200 μm to 300 μm, and a small hole (4) on the side wall with a diameter of about 10 μm.
FBG (5), its length is 10mm, the center wavelength is 1550 nm.
Spectrometer (7), its biggest resolution ratio is 10 pm.
The utility model has the advantages that: 1. the sensing head is only needed to be manufactured on the optical fiber fusion splicer, so that the manufacturing is simple and the cost is low; and 2, the sensing head has a compact structure and high strength. 3. The sensing head does not relate to dangerous drugs and is intrinsically safe.
Drawings
The present invention will be further described with reference to the accompanying drawings and the embodiments thereof.
FIG. 1 is a schematic view of the present invention;
in the figure, 1 is a broadband light source; 2 is an incident single mode fiber; 3 is a hollow optical fiber; 4 is a small hole; 5 is FBG; 6 is an emergent single-mode fiber; and 7, a spectrometer.
Detailed Description
In fig. 1, an optical fiber temperature and refractive index sensor based on hollow core optical fiber and FBG comprises (1) a broadband light source; (2) is an incident single mode fiber; (3) is a hollow optical fiber; (4) is a small hole; (5) is FBG; (6) is an outgoing single mode fiber; (7) is composed of a spectrometer; the output of broadband light source (1) is connected with the left end of incidenting single mode fiber (2), and the right-hand member of incidenting single mode fiber (2) is connected with the left end of hollow optic fibre (3), and the right-hand member of hollow optic fibre (3) is connected with the left end of FBG (5), and the right-hand member of FBG (5) is connected with the left end of outgoing single mode fiber (6), and the right-hand member of outgoing single mode fiber (6) links to each other with spectrum appearance (5).
An optical fiber temperature and refractive index sensor based on hollow optical fiber and FBG has the working mode that: light emitted by the broadband light source (1) is input into the incident single-mode optical fiber (2) and propagates through the fiber core in the incident single-mode optical fiber (2). When light is transmitted to the hollow optical fiber (3), the reflecting surfaces at the left end and the right end of the hollow optical fiber form Fabry-Perot interference, and when liquid enters the hollow optical fiber (3) through a small hole in the side wall of the hollow optical fiber (3), the spectrum changes. When light is transmitted to the FBG (5), since the FBG is sensitive to temperature, its center wavelength is shifted when the external temperature is changed. The final light is transmitted to the spectrometer (7) through the outgoing single-mode fiber (6), and a pattern is displayed on the spectrometer (7).
The environmental temperature can be measured by moving the central wavelength of the FBG, and the liquid refractive index can be measured by the wavelength change value of the Fabry-Perot interference spectrum on the spectrometer, so that the temperature and the refractive index can be measured simultaneously on one sensing head structure.
Claims (2)
1. An optical fiber temperature and refractive index sensor based on a hollow optical fiber and an FBG (fiber Bragg Grating) comprises a broadband light source (1), an incident single-mode optical fiber (2), a hollow optical fiber (3), a small hole (4), an FBG (5), an emergent single-mode optical fiber (6) and a spectrometer (7); the output end of the broadband light source (1) is connected with the left end of the incident single-mode fiber (2), the right end of the incident single-mode fiber (2) is connected with the left end of the hollow fiber (3), the right end of the FBG (5) is connected with the left end of the emergent single-mode fiber (6), and the right end of the emergent single-mode fiber (6) is connected with the spectrometer (7); the FBG is characterized in that the right end of the hollow optical fiber (3) is connected with the left end of the FBG (5), and a small hole (4) is formed in the side wall of the hollow optical fiber (3).
2. An optical fiber temperature and refractive index sensor based on hollow core fiber and FBG according to claim 1, characterized in that the hollow core fiber (3) has an inner diameter of 80 μm, a cladding diameter of 125 μm, a length of 200 μm to 300 μm, and a small hole (4) on the side wall with a diameter of about 10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921028441.7U CN210141872U (en) | 2019-07-03 | 2019-07-03 | Optical fiber temperature and refractive index sensor based on hollow optical fiber and FBG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921028441.7U CN210141872U (en) | 2019-07-03 | 2019-07-03 | Optical fiber temperature and refractive index sensor based on hollow optical fiber and FBG |
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| Publication Number | Publication Date |
|---|---|
| CN210141872U true CN210141872U (en) | 2020-03-13 |
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| CN201921028441.7U Expired - Fee Related CN210141872U (en) | 2019-07-03 | 2019-07-03 | Optical fiber temperature and refractive index sensor based on hollow optical fiber and FBG |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432750A (en) * | 2021-05-20 | 2021-09-24 | 武汉工程大学 | High-sensitivity temperature sensor based on hollow optical fiber and manufacturing method thereof |
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2019
- 2019-07-03 CN CN201921028441.7U patent/CN210141872U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432750A (en) * | 2021-05-20 | 2021-09-24 | 武汉工程大学 | High-sensitivity temperature sensor based on hollow optical fiber and manufacturing method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |