CN107677390B - Preparation method of fused-cone type optical fiber Mach-Zehnder sensor - Google Patents
Preparation method of fused-cone type optical fiber Mach-Zehnder sensor Download PDFInfo
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- CN107677390B CN107677390B CN201710860439.5A CN201710860439A CN107677390B CN 107677390 B CN107677390 B CN 107677390B CN 201710860439 A CN201710860439 A CN 201710860439A CN 107677390 B CN107677390 B CN 107677390B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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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
Abstract
The invention discloses a preparation method of a fused taper type optical fiber Mach-Zehnder sensor. The optical fiber Mach-Zehnder sensor can simultaneously measure the temperature and the refractive index, the fiber core and the cladding of the optical fiber are equivalent to a reference arm and a detection arm, and light transmitted in the fiber core and the cladding can interfere to form a spectrum to be measured. The specific manufacturing process is that a multimode fiber is added between two sections of single-mode fibers, a thick fiber cone is welded on the multimode fiber, and finally, the sensing arm is corroded by hydrofluoric acid. Through the deep research on the manufacturing method of the optical fiber rough cone and the accurate application of the corrosion process, the optical fiber Mach-Zehnder sensor for multi-parameter sensing measurement is manufactured.
Description
Technical Field
The invention belongs to the field of optical fiber sensing, relates to the preparation of an optical fiber sensor, and particularly relates to a manufacturing method of a multimode optical fiber Mach-Zehnder sensor, manufacturing of an optical fiber coarse cone and an optical fiber corrosion process.
Background
The optical fiber sensing device has the advantages of electromagnetic interference resistance, good electrical insulation, safe use and the like. The research and development of the optical fiber sensor are highly emphasized in all countries, and a great deal of cost is invested to develop the technical research and development of the optical fiber sensor. In actual measurement, the measurement of the refractive index is inevitably affected by temperature change, so that it is necessary to achieve simultaneous measurement of the refractive index and the temperature. The optical fiber Mach-Zehnder sensor structure belongs to an interference type sensor, and is widely applied to various fields of military and civil use due to the advantages of high sensitivity, light weight, compact and changeable structure, multiple measuring objects, stable chemical property, small influence on a measured medium, low cost and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a preparation method of a fused-tapered optical fiber Mach-Zehnder sensor.
The technical scheme of the invention is realized as follows:
a preparation method of a fused-cone optical fiber Mach-Zehnder sensor comprises the following steps:
1) firstly, adding a section of multimode fiber into two sections of single-mode fibers, wherein the diameter of a fiber core is between 50um and 100um, and the diameter of a cladding is 125 um;
2) manufacturing a thick cone coupling point on the multimode optical fiber by using a fusion splicer, wherein the thick cone is positioned in the middle of the multimode optical fiber, the diameter range is 165um-170um, and the cone length range is 410um-415 um;
3) then, the structure is corroded, the optical fiber sensing wall is corroded for 10-25 minutes by hydrofluoric acid, and the sensing wall is cleaned by NaOH solution with the percentage concentration of 1% -2% and deionized water;
4) and finally, carrying out multi-parameter measurement on the temperature and the refractive index of the sensor by using a multi-parameter matrix equation.
The length of the multimode optical fiber is between 10mm and 100 mm.
The percentage concentration of the hydrofluoric acid in the step 3) is 30% -50%.
Drawings
Fig. 1 is a flow chart of the manufacturing process of the optical fiber sensor.
Fig. 2 is a schematic diagram of a fiber optic coarse taper mach-zehnder sensor.
Wherein 1 is the thick taper of the optical fiber.
Detailed Description
The invention is further described below with reference to the following figures and examples, the specific steps are as follows:
1. the method for manufacturing the multi-parameter sensor based on the multimode optical fiber comprises the following steps:
preparing a Mach-Zehnder sensor: and adding a multimode optical fiber between the two single modes. High-order modes are generated in the multimode due to mode mismatch and interfere, and interference fringes can be demodulated after the high-order modes are coupled and led out by using single-mode optical fibers.
First, the cutting of the fiber end face must be inspected to ensure flatness and cleanliness.
The coating layer is removed. The optical fibers used in the invention are all bare fibers and only have coating layers. First, the coating layer was peeled off from the cut end of the optical fiber by a miller clamp, and then the optical fiber was wiped with absorbent cotton dipped in alcohol to remove the residue on the coating layer and clean the surface.
(2) The coated fiber end was cut, the cutter used in this experiment, Furukawa fit L S325, it being noted that the fiber had to be laid flat with the edge perpendicular to the fiber axis during cutting.
(3) Because the fiber end face is smooth and clean, the welding effect of the optical fiber is directly influenced. Further inspection of the cleaved fiber end faces is required.
2. Welding a thick cone: the optical fiber used in the experiment was a corning multimode fiber. The thick cone was fusion-spliced by a common commercial optical fiber fusion splicer (gulhe S177B) as shown in fig. 1. The method is convenient, and only the coating layer and the cladding of the middle part of the optical fiber are stripped by using Miller pliers, and the bare fiber part after treatment can be directly fixed on a welding machine to be subjected to extrusion welding in a manual welding mode after being wiped clean by alcohol.
The thick taper of the optical fiber is formed by increasing the pushing amount of the two ends in the fusion process. Finally, the advancing distance is set in the range of 200um-280um, and the premelting time is set in the range of 230ms-300 ms. The length of the fiber taper is about 410um-415um, the diameter is about 165um-170um, and the diameter of the fiber taper is larger than that of the ordinary fiber (125 um).
3. The method mainly improves the sensitivity of the refractive index by an etching method, and the etching treatment mainly comprises the following steps:
at normal temperature, the corrosion rate of hydrogen fluoacid has a very large relationship with its concentration. In the concentration range (2-24%), the following corrosion reactions occurred, and both reactions proceeded simultaneously, but only the second reaction occurred at high concentration, so that only 40% concentration of hydrofluoric acid was used in this experiment.
SiO2+4HF→SiF4+2H2O (1)
SiO2+6HF→H2SiF6+2H2O (2)
Corrosion of the fiber optic sensor arm: the method is characterized in that a 40% hydrofluoric acid solution is directly dripped on a position needing to be corroded of an optical fiber, the hydrofluoric acid solution has fluidity, and in order to prevent acid liquid from diffusing and flowing to a non-corrosion area along the optical fiber to two sides to corrode other optical fibers, glycerin is dripped on the optical fibers at two ends of a corrosion area, the glycerin is thick and small in fluidity, and the glycerin and the hydrofluoric acid react slowly, so that the hydrofluoric acid can be effectively prevented from diffusing to a coupling point, an input optical fiber and an output optical fiber, and corrosion to the part outside a sensor is avoided, and a sensing arm is corroded for 25 minutes to improve the response sensitivity of the refractive.
4. Designing a temperature and refractive index measurement scheme.
The method comprises the steps of building a temperature and refractive index experimental system of a sensor, placing a developed optical fiber Mach-Zehnder sensor and a standard thermocouple in a high-temperature furnace to heat the optical fiber Mach-Zehnder sensor and the standard thermocouple during temperature measurement, adopting a C + L type broadband light source, monitoring an interference spectrum of the optical fiber Mach-Zehnder sensor by using an MS740A spectrum analyzer (Ri Ben-Anli company), simultaneously recording a reading of the standard thermocouple and a temperature response curve of the spectrum analyzer during temperature rise of the high-temperature furnace, measuring a transmission spectrum of the sensing system by using the spectrum analyzer during refractive index measurement, measuring the optical fiber Mach-Zehnder transmission spectrum under liquid with different environmental refractive indexes through experiments, further analyzing and calculating performance indexes such as response sensitivity of the sensor, and finally simultaneously sensing and measuring double parameters of the temperature and the refractive index by using a sensitivity matrix equation.
Claims (3)
1. A preparation method of a fused-cone optical fiber Mach-Zehnder sensor is characterized by comprising the following steps:
1) firstly, adding a section of multimode fiber into two sections of single-mode fibers, wherein the diameter of a fiber core is between 50um and 100um, and the diameter of a cladding is 125 um;
2) manufacturing a thick cone coupling point on the multimode optical fiber by using a fusion splicer, wherein the thick cone is positioned in the middle of the multimode optical fiber, the diameter range is 165um-170um, and the cone length range is 410um-415 um;
3) then, the structure is corroded, the optical fiber sensing wall is corroded for 10-25 minutes by hydrofluoric acid, and the sensing wall is cleaned by NaOH solution with the percentage concentration of 1% -2% and deionized water;
4) and finally, carrying out multi-parameter measurement on the temperature and the refractive index of the sensor by using a multi-parameter matrix equation.
2. A method according to claim 1, wherein the multimode optical fibre has a length of between 10mm and 100 mm.
3. The method for preparing a fused taper fiber Mach-Zehnder sensor as claimed in claim 1, wherein said percentage concentration in step 3) is 30% -50% hydrofluoric acid.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108444408A (en) * | 2018-03-05 | 2018-08-24 | 武汉理工大学 | A kind of Mach increases Dare and interferes bending sensor |
| CN108957795A (en) * | 2018-08-10 | 2018-12-07 | 长春理工大学 | A kind of optical interferometer and tunable wave length full-optical-fiber laser |
| CN109974758B (en) * | 2019-04-11 | 2020-03-24 | 东北大学 | Optical fiber sensor for simultaneously measuring three parameters of sea water temperature, salt depth and preparation method thereof |
| CN112050966A (en) * | 2019-06-06 | 2020-12-08 | 武汉工程大学 | Optical fiber sensor based on hybrid cascade structure and preparation method |
| CN112179535B (en) * | 2020-08-28 | 2022-02-11 | 西安交通大学 | Double-parameter integrated sensor, preparation method thereof and monitoring system |
| CN112254838B (en) * | 2020-10-10 | 2023-01-20 | 南京邮电大学 | High-sensitivity temperature sensor based on cascade conical two-mode optical fiber structure and testing device |
| CN112729377B (en) * | 2020-12-02 | 2022-09-27 | 北京信息科技大学 | Coarse cone interference structure, preparation method and temperature and concentration double-parameter measurement method |
| CN112729596B (en) * | 2020-12-02 | 2022-09-27 | 北京信息科技大学 | Temperature calcium ion concentration double-parameter sensor and preparation method thereof |
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| CN102393220A (en) * | 2011-10-18 | 2012-03-28 | 哈尔滨工程大学 | SMS (single mode-multimode-single mode) optical fiber structural duplexing sensor |
| CN105181170A (en) * | 2015-04-30 | 2015-12-23 | 中国计量学院 | Mach-Zehnder interferometer temperature sensor based on corroded photonic crystal fibers |
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| US6930768B2 (en) * | 2003-05-12 | 2005-08-16 | Furukawa Electric North America | Detection of discontinuities in a multimode optical fiber |
| CN102096151B (en) * | 2010-12-15 | 2013-02-13 | 北京理工大学 | Method for manufacturing fiber Mach-Zehnder interferometer |
| CN103115570B (en) * | 2013-01-17 | 2015-09-23 | 中国计量学院 | Based on the Mach-Zahnder interference micrometric displacement sensor of telescope-type pyrometric cone structure |
| WO2014198409A1 (en) * | 2013-06-12 | 2014-12-18 | Optics Balzers Ag | Integrated optical waveguide sensor system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102393220A (en) * | 2011-10-18 | 2012-03-28 | 哈尔滨工程大学 | SMS (single mode-multimode-single mode) optical fiber structural duplexing sensor |
| CN105181170A (en) * | 2015-04-30 | 2015-12-23 | 中国计量学院 | Mach-Zehnder interferometer temperature sensor based on corroded photonic crystal fibers |
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