CN203148833U - Humidity sensor with temperature compensation based on fiber loop mirror - Google Patents
Humidity sensor with temperature compensation based on fiber loop mirror Download PDFInfo
- Publication number
- CN203148833U CN203148833U CN 201220593198 CN201220593198U CN203148833U CN 203148833 U CN203148833 U CN 203148833U CN 201220593198 CN201220593198 CN 201220593198 CN 201220593198 U CN201220593198 U CN 201220593198U CN 203148833 U CN203148833 U CN 203148833U
- Authority
- CN
- China
- Prior art keywords
- polarization maintaining
- humidity
- fiber
- optical fibre
- maintaining optical
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model refers to a humidity sensor with temperature compensation based on fiber loop mirror. The humidity sensor is made according to the principle that the first polarization maintaining fiber in fiber loop mirror is modulated by the outside humidity, while the second is not. The humidity sensor comprises a broadband light source, a 2 * 2 fiber coupler, two polarization maintaining fibers, humidity sensitive material and a spectrometer. The fiber loop mirror consists of two polarization maintaining fibers of the same type and the fiber coupler. Wherein, the first polarization maintaining fiber coated with even humidity sensitive material controls the sensing of humidity, and the second polarization maintaining fiber eliminates the influence of temperature on the humidity sensor. In the utility model, the first polarization maintaining fiber is simultaneously modulated by temperature and humidity, and the second polarization maintaining fiber is only modulated by temperature, and the outside humidity information is obtained by measuring the spectral shift difference between the two. With small volume, low cost, simple structure and high sensitivity, the sensor in the utility model can be widely used to test out the humidity parameter in a variety of circumstances.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of temperature compensation humidity sensor based on fiber loop mirror.
Background technology
Humidity is the expression water in air important physical amount of dividing content in the modern industrial or agricultural, and is 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.Traditional sensors some special as strong-electromagnetic field or inflammable and explosive occasion under (as electromagnetic field or inflammable and explosive), be difficult to effectively detect.Compare with traditional sensor, corrosion-resistant, anti-electromagnetic interference (EMI) that Fibre Optical Sensor has, highly sensitive, volume is little, be suitable for inflammable and explosive environment uses and be convenient to advantage such as multiple spot many reference amounts measurement, belongs to noncontact, non-destroyed measurement.
The sensor for temperature of fiber loop mirror structure is very responsive, does not directly apply in the sensing device if do not take the temperature compensation measure, will influence the stability of device.Temperature compensation humidity sensor based on fiber loop mirror adopts polarization maintaining optical fibre and fiber coupler welding gained, makes simply, and is with low cost, can eliminate temperature to the influence of sensor, is used for the detection of humidity parameter under the multiple environment.The utility model utilizes two polarization maintaining optical fibres, and wherein a conduct is eliminated Temperature Influence with reference to optical fiber, and another root surface-coated layer of even humidity sensitive material is realized humidity sensor.
The utility model content
At problems of the prior art, the purpose of this utility model provides a kind of temperature compensation humidity sensor technical scheme based on fiber loop mirror.
Described a kind of temperature compensation humidity sensor based on fiber loop mirror, it is characterized in that comprising wideband light source, optical fiber 2 * 2 coupling mechanisms, two polarization maintaining optical fibres, humidity sensitive material, spectrometer, two ports of described optical fiber 2 * 2 coupling mechanisms one side connect wideband light source and spectrometer respectively, two ports of opposite side connect first polarization maintaining optical fibre and second polarization maintaining optical fibre, form a fiber loop mirror structure, described humidity sensitive material is coated in the first polarization maintaining optical fibre surface.
Described a kind of temperature compensation humidity sensor based on fiber loop mirror, the diameter that it is characterized in that described first polarization maintaining optical fibre is 60-90 μ m, and length is 10cm, and the diameter of second polarization maintaining optical fibre is 125 μ m, and length is 10cm.
Described a kind of temperature compensation humidity sensor based on fiber loop mirror is characterized in that described first polarization maintaining optical fibre is is that the polarization maintaining optical fibre of 125 μ m obtains by chemical corrosion by cladding diameter.
Advantage of the present utility model is: utilize Optical Fiber Transmission and fiber loop mirror structure, make humidity sensor have characteristics such as anti-electromagnetic interference (EMI), use first polarization maintaining optical fibre and humidity sensitive material as transducing part, sensor construction is compact simply, volume is little, cost is low, use second polarization maintaining optical fibre as reference optical fiber, can eliminate temperature to the influence of this sensor, obtain a kind of temperature compensation humidity sensor that has.
Description of drawings
Fig. 1 is the structural representation of a kind of temperature compensation humidity sensor based on fiber loop mirror of the utility model.
Embodiment
Below in conjunction with Figure of description the utility model is described further.
The utility model is a kind of temperature compensation humidity sensor based on fiber loop mirror, comprise wideband light source 1, spectrometer 2, optical fiber 2 * 2 coupling mechanisms 3, first polarization maintaining optical fibre 4, second polarization maintaining optical fibre 5, humidity sensitive material 6, two ports of described optical fiber 2 * 2 coupling mechanisms 3 one sides connect wideband light source 1 and spectrometer 2 respectively, two ports of opposite side are connected with second polarization maintaining optical fibre 5 with described first polarization maintaining optical fibre 4, form the fiber loop mirror structure, the diameter of described first polarization maintaining optical fibre 4 is 60-90 μ m, is to be that the polarization maintaining optical fibre of 125 μ m obtains by chemical corrosion by cladding diameter; The diameter of second polarization maintaining optical fibre 5 is 125 μ m, and length all is 10cm, and the refractive index of described humidity sensitive material 6 changes with extraneous humidity.
The working method of the humidity sensor of temperature compensation described in the utility model is: the light that wideband light source sends enters fiber coupler and is divided into two bundles and transmits light transmission in opposite directions and enter fiber loop mirror, propagates to transmit the back into optical fibers coupling mechanism again after a week and export from output port in fiber loop mirror.Though the light path of this two-beam process is just the same, because the existence of first polarization maintaining optical fibre and second polarization maintaining optical fibre causes two-beam generation phase differential in the fiber loop mirror, thereby makes the spectrum of fiber coupler output terminal output have several loss peaks.When ambient temperature changed, two polarization maintaining optical fibre transmission spectrum integral body left or move right; When the humidity in the external world changes, the corresponding variation takes place in the equivalent refractive index of first polarization maintaining optical fibre that only scribbles the material of humidity sensitive, thereby cause the first polarization maintaining optical fibre transmission spectrum to be moved, the loss peak that utilizes spectrometer to detect the first and second polarization maintaining optical fibre transmission spectrums relatively moves, and can obtain the humidity size of surrounding environment.
The utility model can realize that the gordian technique of temperature compensation is: second polarization maintaining optical fibre is as reference optical fiber, and when ambient temperature raise gradually, the output spectrum of first polarization maintaining optical fibre and second polarization maintaining optical fibre was moved to the left simultaneously.Under uniform temp, surface-coated humidity sensing polymer materials at first polarization maintaining optical fibre, and in the relative humidity variations process, spectrometer shows the spectrogram that a trough is fixed, another trough is moved to the left, thereby can compensate the drift that causes transmission spectrum because of temperature change.Simultaneously, be in 20%～80% in the relative humidity scope, the refractive index of humidity sensitive material is corresponding to change to 1.36 from 1.43.
Claims (3)
1. temperature compensation humidity sensor based on fiber loop mirror, its feature comprises wideband light source (1), spectrometer (2), optical fiber 2 * 2 coupling mechanisms (3), first polarization maintaining optical fibre (4), second polarization maintaining optical fibre (5), humidity sensitive material (6), two ports of described optical fiber 2 * 2 coupling mechanisms (3) one sides connect wideband light source (1) and spectrometer (2) respectively, two ports of opposite side are connected with second polarization maintaining optical fibre (5) with described first polarization maintaining optical fibre (4) respectively, form the fiber loop mirror structure, described humidity sensitive material (6) is coated in polarization maintaining optical fibre (4) surface.
2. a kind of temperature compensation humidity sensor based on fiber loop mirror according to claim 1, the diameter that it is characterized in that described first polarization maintaining optical fibre (4) is 60-90 μ m, length is 10cm, and the diameter of second polarization maintaining optical fibre (5) is 125 μ m, and length is 10cm.
3. a kind of temperature compensation humidity sensor based on fiber loop mirror according to claim 1 is characterized in that described first polarization maintaining optical fibre (4) is is that the polarization maintaining optical fibre of 125 μ m obtains by chemical corrosion by cladding diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220593198 CN203148833U (en) | 2012-11-07 | 2012-11-07 | Humidity sensor with temperature compensation based on fiber loop mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220593198 CN203148833U (en) | 2012-11-07 | 2012-11-07 | Humidity sensor with temperature compensation based on fiber loop mirror |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203148833U true CN203148833U (en) | 2013-08-21 |
Family
ID=48976349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220593198 Expired - Fee Related CN203148833U (en) | 2012-11-07 | 2012-11-07 | Humidity sensor with temperature compensation based on fiber loop mirror |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203148833U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728274A (en) * | 2013-12-30 | 2014-04-16 | 天津大学 | Seawater chloride ion concentration measuring device based on dual-fiber optical grating |
| CN108896488A (en) * | 2018-07-17 | 2018-11-27 | 山东省科学院激光研究所 | Light fibre humidity transducer, production method, data processing method and acquisition device |
-
2012
- 2012-11-07 CN CN 201220593198 patent/CN203148833U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728274A (en) * | 2013-12-30 | 2014-04-16 | 天津大学 | Seawater chloride ion concentration measuring device based on dual-fiber optical grating |
| CN108896488A (en) * | 2018-07-17 | 2018-11-27 | 山东省科学院激光研究所 | Light fibre humidity transducer, production method, data processing method and acquisition device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203287311U (en) | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor | |
| CN204613104U (en) | A kind of light fibre humidity transducer based on dislocation welding | |
| CN205655942U (en) | Meet an emergency and optical fiber sensor of temperature simultaneous measurement | |
| CN104330101A (en) | Optical fiber sensor capable of measuring temperatures and micrometric displacement simultaneously | |
| CN108562386B (en) | Temperature-compensated photonic crystal fiber transverse stress sensor | |
| CN201859117U (en) | Humidity sensor based on multimode interference SMS (single-mode multimode single-mode) optical fiber structure | |
| CN206411005U (en) | Double grating micro-nano fiber humidity sensing system based on Fa Buli Perot interferences | |
| CN104316106A (en) | Optical fiber sensor based on Mach-Zehnder interference and fiber bragg grating | |
| CN105300927A (en) | Optical fiber humidity sensor based on graphene oxide and polyvinyl alcohol composite film | |
| CN204718708U (en) | A kind of sensor simultaneously measured with strain based on temperature that is spherical and thin-core fibers | |
| CN203587177U (en) | Optical fiber liquid level sensor | |
| CN104297208A (en) | Interferometric optical fiber sensor based on pohotonic crystal optical fiber | |
| CN203657934U (en) | Reflection-type temperature/refractive index two-parameter sensing device employing long-period FBG based on Sagnac ring | |
| CN103528609A (en) | Combined interference type multi-parameter optical fiber sensor | |
| CN103884364A (en) | Optical fiber interferometric sensor based on cascade connection between tapered structure and spherical structure | |
| CN106290170B (en) | A kind of light fibre humidity transducer of the hypersensitivity based on full agar F-P cavity | |
| CN204881905U (en) | Temperature sensor of spherical structure optic fibre | |
| CN104266668A (en) | Optical fiber sensor for temperature and curvature double-parameter measurement | |
| CN206974448U (en) | The joint Raman of both-end detection and the distribution type optical fiber sensing equipment of Brillouin scattering | |
| CN205719020U (en) | The polarization maintaining optical fibre sensor that a kind of temperature is measured with strain simultaneously | |
| CN203224440U (en) | Humidity sensor based on multimode interference MSM (multilayer switch module) structure | |
| CN203148833U (en) | Humidity sensor with temperature compensation based on fiber loop mirror | |
| CN202794029U (en) | Optical fiber humidity sensor for humidity detection device | |
| CN104297210A (en) | Mach-Zehnder humidity sensor based on nuclear glycan coating | |
| CN202994329U (en) | Simultaneous temperature and humidity measuring sensor based on polarization-maintaining long period grating (PM-LPG) environment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20141107 |
|
| EXPY | Termination of patent right or utility model |