CN203224447U - Refractive rate sensor based on fine-core fiber MZ (Mach-Zehnder) interferometer - Google Patents
Refractive rate sensor based on fine-core fiber MZ (Mach-Zehnder) interferometer Download PDFInfo
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- CN203224447U CN203224447U CN 201320089912 CN201320089912U CN203224447U CN 203224447 U CN203224447 U CN 203224447U CN 201320089912 CN201320089912 CN 201320089912 CN 201320089912 U CN201320089912 U CN 201320089912U CN 203224447 U CN203224447 U CN 203224447U
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Abstract
The utility model belongs to the technical field of optical fiber sensing, and in particular relates to a refractive rate sensor based on a fine-core fiber MZ (Mach-Zehnder) interferometer. The sensor comprises a spontaneous radiation broadband light source, an incident single-mode fiber, a fine-core fiber, an emergent single-mode fiber and a spectrometer. According to the sensor, two ends of the fine-core fiber are respectively in non-eccentric welding with the incident single-mode fiber and the emergent single-mode fiber to form a sensing probe; the other end of the incident single-mode fiber is connected with a broadband light source, and the other end of the emergent single-mode fiber is connected with the spectrometer; when the external refractive rate of the fine-core fiber changes, the interference fringe drifts. The sensor has the characteristics of high interference resistance, compact and simple structure, low cost, small size and the like, and has a great application prospect in biological and chemical fields.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of index sensor based on thin-core fibers MZ interferometer.
Background technology
Refractive index has very important effect as a basic physical parameter of reflection material optical properties in optical field, its optical characteristics to material has significant effects, is also playing the part of the role that can not lack aspect other characteristics of explanation material.Liquid is prevalent in human lives's various aspects as a kind of physical form.By the tracer liquid refractive index, can understand other physical characteristicss such as the optical property of liquid and concentration, purity, viscosity.In medical science, food, biology, environmental science, field of petrochemical industry, the detection of liquid refractivity is had great importance and using value, it is the important technical that guarantees product quality, improves product yield, is an important parameters.
Compare with traditional optical method for measuring refractive index that Fibre Optical Sensor has anti-electromagnetic interference (EMI), volume is little, corrosion-resistant, measuring accuracy is high, be suitable for using under the inflammable and explosive environment and stablize advantage such as sensing at a distance, belong to noncontact, non-destroyed measurement.Favourable with photonic crystal fiber, Fiber Bragg Grating FBG (FBG) and long period fiber grating (LPG) etc. based on the index sensor of optical fiber, though it is high but it makes high based on the photonic crystal fiber accuracy of detection then, be not easy to generally promote the use of, other require harshness to measuring.
The utility model content
The purpose of this utility model provides a kind of index sensor based on thin-core fibers MZ interferometer.
Described a kind of index sensor based on thin-core fibers MZ interferometer, it is characterized in that comprising wideband light source, incident single-mode fiber, thin-core fibers, outgoing single-mode fiber, spectrometer, the two ends of described thin-core fibers respectively with incident single-mode fiber and the welding without acceptance of persons of outgoing single-mode fiber, constitute the sensing probe of sensing device, the other end of described incident single-mode fiber links to each other with wideband light source, and the other end of described outgoing single-mode fiber links to each other with spectrometer.
Described a kind of index sensor based on thin-core fibers MZ interferometer, the core diameter that it is characterized in that described incident single-mode fiber are 8 μ m, and cladding diameter is 125 μ m.
Described a kind of index sensor based on thin-core fibers MZ interferometer, the core diameter that it is characterized in that described doped core optical fiber are 3 μ m, and cladding diameter is 125 μ m, and length is 20mm.
The advantage of the utility model patent is: when thin-core fibers is advanced in the optically-coupled of single-mode fiber, part optically-coupled is advanced the thin-core fibers fibre core and is transmitted as core, another part optically-coupled advances to inspire cladding mode in the thin-core fibers covering and transmit along covering, when core and cladding mode interfere when being coupled into single-mode fiber.When thin-core fibers surrounding liquid refractive index changes, cladding mode is modulated, be that the interference fringe of output is moved, realize refractometry by the drift value of demodulated interferential striped refractive index.Owing to adopt Fibre Optical Sensor, use single-mode fiber and thin-core fibers as transducing part, adopt the MZ interference peak to move and measures, therefore this sensor has anti-electromagnetic interference (EMI), compact conformation, highly sensitive, can be extensively to be used for the monitoring of biological and chemical field refractive index.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with Figure of description the utility model is further specified:
As shown in Figure 1, a kind of index sensor based on thin-core fibers MZ interferometer, comprise spontaneous radiation wideband light source 1, incident single-mode fiber 2, thin-core fibers 3, outgoing single-mode fiber 4 and spectrometer 5, the two ends of described thin-core fibers 3 respectively with incident single-mode fiber 2 and outgoing single-mode fiber 4 welding without acceptance of persons, constitute the sensing probe of sensing device, the other end of described incident single-mode fiber 2 links to each other with wideband light source 1, and the other end of described outgoing single-mode fiber 4 links to each other with spectrometer 5.
The working method of the utility model device is: the light that wideband light source sends is passed in the incident single-mode fiber, in single-mode fiber, only there is the basic mode transmission, after light is passed to thin-core fibers, owing to reasons such as the mould field do not match, part light transmits along the thin-core fibers fibre core, the covering of thin-core fibers is advanced in another part optically-coupled, inspiring cladding mode transmits in fibre cladding, be that core and being bundled into interferes when core and the cladding mode welding point by the thin-core fibers single-mode fiber is coupled into the single-mode fiber fibre core.The peak wavelength of interference light is relevant with the effective refractive index of cladding mode, when the liquid refractivity around the thin-core fibers changes, changed the change that causes cladding-effective-index by liquid refractivity, thereby cause that phase differential changes between thin-core fibers cladding mode and the core, it is output interference spectrum wave length shift, when being immersed in thin-core fibers in the index-matching fluid, cladding mode changes, thereby interference pattern is changed, realize refractometry by the drift value of demodulated interferential striped refractive index.
The utility model can be crossed the key that realizes measuring refractive indexes of liquid: employed thin-core fibers can be divided into the light in the single-mode fiber core and the transmission of cladding mode two parts, transmit in covering owing to cladding mode simultaneously, extraneous change of refractive can influence the equivalent refractive index of cladding mode, thereby the phase differential between change and the core makes output interfere and drifts about.
In the present embodiment, the core diameter of the incident optical of selecting for use and outgoing single-mode fiber is 8 μ m, cladding diameter is 125 μ m, the core diameter of thin-core fibers is 3 μ m, cladding diameter is 125 μ m, length is 20mm, and when the external refractive index variation range from 1.33 to 1.43, obtaining refractive index sensitivity is 5.5 * 10
-5RIU.
Claims (3)
1. index sensor based on thin-core fibers MZ interferometer, it is characterized in that comprising wideband light source (1), incident single-mode fiber (2), thin-core fibers (3), outgoing single-mode fiber (4) and spectrometer (5), the two ends of described thin-core fibers (3) respectively with incident single-mode fiber (2) and outgoing single-mode fiber (4) welding without acceptance of persons, constitute the sensing probe of sensing device, the other end of described incident single-mode fiber (2) links to each other with wideband light source (1), and the other end of described outgoing single-mode fiber (4) links to each other with spectrometer (5).
2. a kind of index sensor based on thin-core fibers MZ interferometer according to claim 1, the core diameter that it is characterized in that described incident single-mode fiber (2) and outgoing single-mode fiber (3) is 8 μ m, cladding diameter is 125 μ m.
3. a kind of index sensor based on thin-core fibers MZ interferometer according to claim 1, the core diameter that it is characterized in that described thin-core fibers (3) is 3 μ m, and cladding diameter is 125 μ m, and length is 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320089912 CN203224447U (en) | 2013-02-27 | 2013-02-27 | Refractive rate sensor based on fine-core fiber MZ (Mach-Zehnder) interferometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320089912 CN203224447U (en) | 2013-02-27 | 2013-02-27 | Refractive rate sensor based on fine-core fiber MZ (Mach-Zehnder) interferometer |
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| CN203224447U true CN203224447U (en) | 2013-10-02 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823125A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | Fine-core optical core and magnetic fluid-based electric field sensor |
| CN104390594A (en) * | 2014-11-10 | 2015-03-04 | 西北大学 | Optic fiber micro-structure displacement sensor |
| CN105259117A (en) * | 2015-08-14 | 2016-01-20 | 江苏双仪光学器材有限公司 | Mode interference-based fine core cascaded optical fiber biosensor |
| CN106568466A (en) * | 2016-10-19 | 2017-04-19 | 暨南大学 | Fine core microstructure optical fiber interferometer sensor and temperature and strain detection method therefor |
| CN107271401A (en) * | 2017-07-28 | 2017-10-20 | 中国工程物理研究院激光聚变研究中心 | The molecular state organic pollutant monitoring sensor of small core single mode single-mode fiber structure is drawn based on single mode |
| CN107894292A (en) * | 2017-11-17 | 2018-04-10 | 中国计量大学 | Refractive index temperature double parameter measuring method and device based on optical fiber surface plasmon resonance body |
| CN108279079A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of point type temperature sensing device coating dimethyl silicone polymer based on coreless fiber radial direction serious mistake bit architecture |
| CN108917800A (en) * | 2018-06-21 | 2018-11-30 | 国家电网有限公司 | Coreless fiber hybrid sensor and experimental system |
| CN110873701A (en) * | 2019-10-22 | 2020-03-10 | 华南师范大学 | Optical fiber humidity sensor based on Mach-Zehnder interferometer |
-
2013
- 2013-02-27 CN CN 201320089912 patent/CN203224447U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103823125A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | Fine-core optical core and magnetic fluid-based electric field sensor |
| CN104390594A (en) * | 2014-11-10 | 2015-03-04 | 西北大学 | Optic fiber micro-structure displacement sensor |
| CN104390594B (en) * | 2014-11-10 | 2017-05-03 | 西北大学 | Optic fiber micro-structure displacement sensor |
| CN105259117A (en) * | 2015-08-14 | 2016-01-20 | 江苏双仪光学器材有限公司 | Mode interference-based fine core cascaded optical fiber biosensor |
| CN106568466A (en) * | 2016-10-19 | 2017-04-19 | 暨南大学 | Fine core microstructure optical fiber interferometer sensor and temperature and strain detection method therefor |
| CN107271401A (en) * | 2017-07-28 | 2017-10-20 | 中国工程物理研究院激光聚变研究中心 | The molecular state organic pollutant monitoring sensor of small core single mode single-mode fiber structure is drawn based on single mode |
| CN107894292A (en) * | 2017-11-17 | 2018-04-10 | 中国计量大学 | Refractive index temperature double parameter measuring method and device based on optical fiber surface plasmon resonance body |
| CN107894292B (en) * | 2017-11-17 | 2023-12-29 | 中国计量大学 | Refractive index temperature double-parameter measurement method and device based on optical fiber surface plasmon resonance |
| CN108279079A (en) * | 2018-01-08 | 2018-07-13 | 东北大学 | A kind of point type temperature sensing device coating dimethyl silicone polymer based on coreless fiber radial direction serious mistake bit architecture |
| CN108917800A (en) * | 2018-06-21 | 2018-11-30 | 国家电网有限公司 | Coreless fiber hybrid sensor and experimental system |
| CN108917800B (en) * | 2018-06-21 | 2024-03-12 | 国家电网有限公司 | Coreless optical fiber hybrid sensor and experimental system |
| CN110873701A (en) * | 2019-10-22 | 2020-03-10 | 华南师范大学 | Optical fiber humidity sensor based on Mach-Zehnder interferometer |
| CN110873701B (en) * | 2019-10-22 | 2023-11-28 | 华南师范大学 | Optical fiber humidity sensor based on Mach-Zehnder interferometer |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20131002 Termination date: 20140227 |