CN201859117U - Humidity sensor based on multimode interference SMS (single-mode multimode single-mode) optical fiber structure - Google Patents
Humidity sensor based on multimode interference SMS (single-mode multimode single-mode) optical fiber structure Download PDFInfo
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- CN201859117U CN201859117U CN2010206179652U CN201020617965U CN201859117U CN 201859117 U CN201859117 U CN 201859117U CN 2010206179652 U CN2010206179652 U CN 2010206179652U CN 201020617965 U CN201020617965 U CN 201020617965U CN 201859117 U CN201859117 U CN 201859117U
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Abstract
The utility model relates to a humidity sensor based on a multimode interference SMS (single-mode multimode single-mode) optical fiber structure. A traditional humidity sensor has the shortcomings of low measuring precision, slow response speed, difficulty in signal processing and control, poor long-term stability and interchangeability, dampness, drifting, poor interference resistance and the like, so that the traditional humidity sensor is limited in the fields of nuclear industry, power transmission and the like, and cannot meet the need of modern science and technology development. Two ends of a multimode optical fiber core are respectively in butt fusion with an incident single-mode optical fiber and an emergent single-mode optical fiber in a non-eccentric manner, humidity-sensitive materials are coated on the surface of the multimode optical fiber core, the incident single-mode optical fiber is connected with a wideband light source, and the emergent single-mode optical fiber is connected with a spectrograph, so that a humidity sensing device is formed. The sensor is small in size, simple in structure, anti-interference and high in sensitiveness, the cost of the optical fiber sensor is reduced, and the sensor has larger application prospect in chemical and biological fields.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure.
Background technology
Humidity is the physical quantity of expression water in air vapour content.Fast development and continuous progress in science and technology along with industrial or agricultural, monitoring to ambient humidity more and more is subject to people's attention, and is also more and more higher to the requirement of leading indicators such as the environmental suitability of humidity sensor and measurement range, response speed, measuring accuracy.Industries such as science and techniques of defence, Aero-Space, generating power transformation, weaving, food, medicine, storage, agricultural are all very strict to the requirement of humidity, and the humidity parameter is carried out effectively monitoring in real time and control, become the prerequisite of ordinary production.The psychrometer and the hair hygrometer of early stage invention, because shortcomings such as its measuring accuracy is low, response speed is slow, signal Processing and control difficulties, its range of application is very limited.In the existing humidity sensor, electric weight such as condenser type, resistance-type humidity sensor, because measuring accuracy height, response speed are fast and signal is easy to handle and advantage such as control, dominate in market, but there is shortcomings such as the deficiency of long-time stability and interchangeability difference and humidity hysteresis, drift, poor anti jamming capability, be restricted in fields such as nuclear industry, electric power transfer, therefore also can't satisfy the needs of development of modern scientific technology.
Fibre Optical Sensor have anti-electromagnetic interference (EMI), highly sensitive, volume is little, characteristics such as anticorrosive, belongs to noncontact, non-destroyed measurement.Optical fiber sensing technology is combined with moisture measurement, widened the application of humidity sensor greatly.Light fibre humidity transducer has many advantages with respect to traditional humidity sensor, simple as manufacture craft, volume is little, good stability, anticorrosive, be not subjected to electromagnetic interference (EMI), be applicable to various rugged environments etc.Different moisture levels sensor based on optical fiber has obtained broad research at present, as humidity sensor, based on the humidity sensor of long period fiber grating (LPG) and based on the humidity sensor of New-type photon crystal optical fiber (PCF) based on bragg grating (FBG).New-type photon crystal optical fiber is compared than ordinary optic fibre and is cost an arm and a leg, and needs special welding instrument, has therefore increased production cost greatly.
The utility model content
At problems of the prior art, the purpose of this utility model is to provide a kind of light fibre humidity transducer based on multiple-mode interfence SMS optical fiber structure simple in structure, highly sensitive, with low cost.
Described a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure, it is characterized in that comprising wideband light source, incident single-mode fiber, multimode optical fiber fibre core, humidity sensitive material, outgoing single-mode fiber, spectrometer, described incident single-mode fiber one end connects wideband light source, the one end welding without acceptance of persons of the other end and multimode optical fiber fibre core, the one end welding without acceptance of persons of the other end of multimode optical fiber fibre core and outgoing single-mode fiber, the other end of outgoing single-mode fiber connects spectrometer, and described humidity sensitive coated materials is on the surface of multimode optical fiber fibre core.
Described a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure, the core diameter that it is characterized in that described incident single-mode fiber and outgoing single-mode fiber are 8.2 μ m, and cladding diameter is 125 μ m.
Described a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure, the diameter that it is characterized in that described multimode optical fiber fibre core are 80-100 μ m.
Described a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure, the diameter that it is characterized in that described multimode optical fiber fibre core are 90 μ m, and length is 40mm.
Described a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure is characterized in that described multimode optical fiber fibre core is that multimode optical fiber by core diameter 105 μ m, cladding diameter 125 μ m obtains by chemical corrosion.
Described a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure is characterized in that described humidity sensitive material is that the refractive index of this material changes with extraneous humidity by the hydrogel of sol-gel process configuration.
The beneficial effects of the utility model: utilize Optical Fiber Transmission, make humidity sensor have characteristics such as anti-electromagnetic interference (EMI), very high reliability and stability are arranged; Only use single-mode fiber, multimode optical fiber and humidity sensitive material as transducing part, make sensor construction compactness, simple, volume is little, and cost is low; Because multimode optical fiber has the attribute that can conduct various modes light, the light of various modes interferes in the multimode optical fiber fibre core, thereby has improved accuracy of detection greatly.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Below in conjunction with Figure of description the utility model is described further:
The utility model is based on the humidity sensor of the single mode-multi-mode-single mode optical fiber structure (SMS optical fiber structure) of multimode interference principle, adopt common single mode optical fibres and multimode optical fiber welding to make, realize humidity sensor at multimode optical fiber fibre core surface-coated one deck humidity sensitive material.
As shown in the figure, a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure, comprise wideband light source 1, incident single-mode fiber 2, multimode optical fiber fibre core 3, humidity sensitive material 4, outgoing single-mode fiber 5, spectrometer 6, described incident single-mode fiber 2 one ends connect wideband light source 1, the one end welding without acceptance of persons of the other end and multimode optical fiber fibre core 3, the one end welding without acceptance of persons of the other end of multimode optical fiber fibre core 3 and outgoing single-mode fiber 5, the other end of outgoing single-mode fiber 5 connects spectrometer 6, and described humidity sensitive material 4 is coated in the surface of multimode optical fiber fibre core 3.The diameter of described multimode optical fiber fibre core 3 is 90 μ m, is that the multimode optical fiber by core diameter 105 μ m, cladding diameter 125 μ m obtains by chemical corrosion; Humidity sensitive material 4 is that the refractive index of this material changes with extraneous humidity by the hydrogel of sol-gel process configuration.
At first the multimode optical fiber with core diameter 105 μ m, cladding diameter 125 μ m obtains the multimode optical fiber fibre core that diameter is 80-100 μ m by chemical corrosion, utilize fused fiber splice equipment that single-mode fiber and multimode optical fiber fibre core are carried out welding without acceptance of persons, wherein multimode optical fiber fibre core one end connects the incident single-mode fiber, an other end is connected with the outgoing single-mode fiber, be coated with last layer humidity sensitive material on multimode optical fiber fibre core surface, the incident single-mode fiber is connected with light source, the outgoing single-mode fiber is connected with spectrometer, forms humidity sensing device.Manufacturing process is fairly simple, and can finish by common fused fiber splice equipment and instrument.
The working method of humidity sensor described in the utility model is: the light that light source sends imports in the incident single-mode fiber, near multimode optical fiber fibre core front end face, its optical field distribution is near Gaussian distribution, incident field as the multimode optical fiber fibre core, when light beam when the multimode optical fiber fibre core transmits, the high-order eigenmode (LP in the multimode optical fiber fibre core
0m) be energized, the light of different mode intercouples in multimode optical fiber.Because the difference of the mould field distribution of the guided mode of different rank causes them to output single-mode fiber basic mode coupling coefficient difference, to such an extent as to have only the guided mode of minority to be coupled to effectively in the fibre core of outgoing single-mode fiber, other patterns will be coupled in the covering of outgoing single-mode fiber, finally be depleted.Therefore when ambient humidity changed, the corresponding change of humidity sensitive material refractive index meeting changed the final transmission spectrum difference that makes output thereby cause being coupled to the guided mode of exporting in the single-mode fiber fibre core.Utilize the interference peaks of spectrometer detected transmission spectrum to move, can obtain the humidity size of surrounding environment.
The utility model can realize that the key of moisture measurement is: obtain the multimode optical fiber fibre core of diameter 80-100 μ m by chemical corrosion, and in the surface-coated humidity sensing polymer materials of multimode optical fiber fibre core.Multimode optical fiber fibre core and two standard single-mode fibers are carried out welding without acceptance of persons, the external refractive index variation range from 1.35 to 1.44, refractive index sensitivity is 5.3 * 10
-5RIU has highly sensitive characteristic.
The single-mode fiber core diameter of selecting for use in the present embodiment is 8.2 μ m, and cladding diameter is 125 μ m, and the multimode optical fiber core diameter is 90 μ m, and length is 40mm.Humidity sensitive section bar material is the hydrogel of sol-gel process configuration, in relative humidity from 0 to 100%RH change procedure, the refractive index of humidity sensitive material also correspondingly increases to 1.431 from 1.367, and total variable quantity reaches 0.064, presents good wet quick characteristic.
Claims (6)
1. humidity sensor based on multiple-mode interfence SMS optical fiber structure, it is characterized in that comprising wideband light source (1), incident single-mode fiber (2), multimode optical fiber fibre core (3), humidity sensitive material (4), outgoing single-mode fiber (5), spectrometer (6), described incident single-mode fiber (2) one ends connect wideband light source (1), the one end welding without acceptance of persons of the other end and multimode optical fiber fibre core (3), the one end welding without acceptance of persons of the other end of multimode optical fiber fibre core (3) and outgoing single-mode fiber (5), the other end of outgoing single-mode fiber (5) connects spectrometer (6), and described humidity sensitive material (4) is coated in the surface of multimode optical fiber fibre core (3).
2. a kind of humidity sensor according to claim 1 based on multiple-mode interfence SMS optical fiber structure, the core diameter that it is characterized in that described incident single-mode fiber (2) and outgoing single-mode fiber (5) is 8.2 μ m, cladding diameter is 125 μ m.
3. a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure according to claim 1, the diameter that it is characterized in that described multimode optical fiber fibre core (3) are 80-100 μ m.
4. a kind of humidity sensor based on multiple-mode interfence SMS optical fiber structure according to claim 1, the diameter that it is characterized in that described multimode optical fiber fibre core (3) are 90 μ m, and length is 40mm.
5. according to claim 1 or 3 or 4 described a kind of humidity sensors, it is characterized in that described multimode optical fiber fibre core (3) is that multimode optical fiber by core diameter 105 μ m, cladding diameter 125 μ m obtains by chemical corrosion based on multiple-mode interfence SMS optical fiber structure.
6. a kind of humidity sensor according to claim 1 based on multiple-mode interfence SMS optical fiber structure, it is characterized in that described humidity sensitive material (4) is that the refractive index of this material changes with extraneous humidity by the hydrogel of sol-gel process configuration.
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| CN2010206179652U CN201859117U (en) | 2010-11-22 | 2010-11-22 | Humidity sensor based on multimode interference SMS (single-mode multimode single-mode) optical fiber structure |
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| CN2010206179652U CN201859117U (en) | 2010-11-22 | 2010-11-22 | Humidity sensor based on multimode interference SMS (single-mode multimode single-mode) optical fiber structure |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507497A (en) * | 2011-10-27 | 2012-06-20 | 中国科学技术大学 | Refractive index sensor based on optical fiber and measurement method |
| CN103293131A (en) * | 2013-05-28 | 2013-09-11 | 暨南大学 | Quick-response conical micro-nano optical fiber humidity sensor and preparation method thereof |
| CN103453940A (en) * | 2013-09-13 | 2013-12-18 | 天津理工大学 | Optical fiber sensor based on multi-mode structure |
| CN103822903A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | No-core fiber based relative air humidity measuring instrument |
| CN103852428A (en) * | 2014-03-12 | 2014-06-11 | 西安石油大学 | Humidity sensor based on multimode fiber core and fiber grating and preparation method of humidity sensor |
| CN106290170A (en) * | 2016-07-27 | 2017-01-04 | 哈尔滨工业大学深圳研究生院 | A kind of supersensitive light fibre humidity transducer based on full agar F P chamber |
| CN107621447A (en) * | 2017-11-06 | 2018-01-23 | 中国计量大学 | A kind of optical fiber hypersensor of measurable liquid quality and humidity |
| CN110376163A (en) * | 2019-07-04 | 2019-10-25 | 浙江大学 | Humidity sensor and preparation method based on graphene and the more single fibers of side throwing list |
| CN110687076A (en) * | 2019-10-28 | 2020-01-14 | 中国科学院西安光学精密机械研究所 | Humidity sensor based on polymer optical fiber mode interferometer |
| CN112098367A (en) * | 2020-09-14 | 2020-12-18 | 哈尔滨工程大学 | Optical fiber humidity sensor and manufacturing method thereof |
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2010
- 2010-11-22 CN CN2010206179652U patent/CN201859117U/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102507497A (en) * | 2011-10-27 | 2012-06-20 | 中国科学技术大学 | Refractive index sensor based on optical fiber and measurement method |
| CN103293131A (en) * | 2013-05-28 | 2013-09-11 | 暨南大学 | Quick-response conical micro-nano optical fiber humidity sensor and preparation method thereof |
| CN103453940A (en) * | 2013-09-13 | 2013-12-18 | 天津理工大学 | Optical fiber sensor based on multi-mode structure |
| CN103822903A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | No-core fiber based relative air humidity measuring instrument |
| CN103852428A (en) * | 2014-03-12 | 2014-06-11 | 西安石油大学 | Humidity sensor based on multimode fiber core and fiber grating and preparation method of humidity sensor |
| CN106290170B (en) * | 2016-07-27 | 2019-10-25 | 哈尔滨工业大学深圳研究生院 | A kind of light fibre humidity transducer of the hypersensitivity based on full agar F-P cavity |
| CN106290170A (en) * | 2016-07-27 | 2017-01-04 | 哈尔滨工业大学深圳研究生院 | A kind of supersensitive light fibre humidity transducer based on full agar F P chamber |
| CN107621447A (en) * | 2017-11-06 | 2018-01-23 | 中国计量大学 | A kind of optical fiber hypersensor of measurable liquid quality and humidity |
| CN107621447B (en) * | 2017-11-06 | 2023-10-13 | 中国计量大学 | Optical fiber ultrasensitive sensor capable of measuring liquid quality and humidity |
| CN110376163A (en) * | 2019-07-04 | 2019-10-25 | 浙江大学 | Humidity sensor and preparation method based on graphene and the more single fibers of side throwing list |
| CN110687076A (en) * | 2019-10-28 | 2020-01-14 | 中国科学院西安光学精密机械研究所 | Humidity sensor based on polymer optical fiber mode interferometer |
| CN112098367A (en) * | 2020-09-14 | 2020-12-18 | 哈尔滨工程大学 | Optical fiber humidity sensor and manufacturing method thereof |
| CN112098367B (en) * | 2020-09-14 | 2024-04-05 | 哈尔滨工程大学 | Optical fiber humidity sensor and manufacturing method thereof |
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Granted publication date: 20110608 Termination date: 20111122 |