CN202994329U - Simultaneous temperature and humidity measuring sensor based on polarization-maintaining long period grating (PM-LPG) environment - Google Patents
Simultaneous temperature and humidity measuring sensor based on polarization-maintaining long period grating (PM-LPG) environment Download PDFInfo
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- CN202994329U CN202994329U CN201220663250.XU CN201220663250U CN202994329U CN 202994329 U CN202994329 U CN 202994329U CN 201220663250 U CN201220663250 U CN 201220663250U CN 202994329 U CN202994329 U CN 202994329U
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Abstract
The utility model belongs to the optical fiber sensing technology and especially relates to a simultaneous temperature and humidity measuring sensor based on a polarization-maintaining long period grating (PM-LPG) environment. According to the utility model, two ports of one side of an optical fiber 3dB coupler are connected with a broadband light source and a spectrometer respectively; the two ports of the other side are connected with two ends of the PM-LPG so as to form an optical fiber environment structure. A humidity-sensitive material is coated on a surface of the PM-LPG. A CO2 laser is used to write the LPG on a polarization-maintaining optical fiber and then the optical fiber environment is formed with the single-mode 3dB optical fiber coupler. A layer of chitosan CS film humidity sensitive material is coated on the surface of the PM-LPG so as to realize simultaneously measuring the humidity and the temperature. The size of the sensor apparatus of the utility model is small. Cost is low and the structure is simple. Sensitivity is high. The sensor can be widely used for simultaneously detecting temperature and humidity parameters under the multiple environments.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror survey sensor simultaneously.
Background technology
Temperature and humidity all can exert an influence to the links of commercial production, agricultural production, therefore simultaneously in measurement environment the variation meeting of temperature and humidity bring many facilities to the measurement in industrial and agricultural production.Traditional sensors some special as strong-electromagnetic field or inflammable and explosive occasion under, 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 the advantage such as multiple spot many reference amounts measurement, belongs to noncontact, non-destroyed measurement.
Long period fiber grating (LPG) has unique sensing characteristics, as drifting about in response to the extraneous changing factor such as change, temperature to reflection and resonance wavelength without male offspring, is obtaining very large development aspect optical fiber communication and senser element.Along with the expansion of application and the progress of technology, people begin to explore at special optical fiber as make LPG on the polarization maintaining optical fibre for the transmission polarized light.
In fiber loop mirror, very responsive to parameters such as temperature, refractive indexes because polarization maintaining optical fibre has two different polarised directions, therefore can be widely used in responding in sensor.The utility model combines long period fiber grating with the polarization-maintaining fiber coil mirror, use high frequency CO
2Laser pulse is inscribed LPG on panda type polarization-preserving fiber, form fiber loop mirror by the inclined to one side long period fiber grating of this guarantor (PM-LPG) and single-mode optical-fibre coupler, and applies one deck shitosan C on the surface of PM-LPG
SFilm is measured humidity, makes this sensor to measure simultaneously humidity and temperature.
The utility model content
The purpose of this utility model is to provide a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror survey sensor technical scheme simultaneously, measures when realizing surrounding environment relative humidity and temperature.
Described a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror is survey sensor simultaneously, it is characterized in that comprising wideband light source, optical fiber three-dB coupler, protects inclined to one side long period fiber grating, shitosan C
SFilm, spectrometer, two ports of described optical fiber three-dB coupler one side connect respectively wideband light source and spectrometer, two ports of opposite side connect the two ends of protecting inclined to one side long period fiber grating, form a fiber loop mirror structure, it is surperficial that described humidity sensitive material is coated in the inclined to one side long period fiber grating of guarantor.
Described a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror is survey sensor simultaneously, it is characterized in that the inclined to one side long period fiber grating length of described guarantor 60-80mm, centre wavelength 1550-1555nm, the long period fiber grating cycle is that 590 μ m, periodicity are 65.
Described a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror is survey sensor simultaneously, it is characterized in that the inclined to one side long period fiber grating of described guarantor is by high frequency CO
2Laser pulse inscribes on panda type polarization-preserving fiber that long period fiber grating obtains.
Described a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror is survey sensor simultaneously, it is characterized in that described shitosan C
SThe hydrogel that film configures by sol-gel process, its refractive index and thickness change and change along with extraneous humidity.
The utility model has the advantage of: utilize optical fiber structure, make sensor have the characteristics such as anti-electromagnetic interference (EMI).Utilize CO
2Laser pulse is inscribed long period fiber grating on panda type polarization-preserving fiber, protecting inclined to one side long-period gratings surface coating shitosan C simultaneously
SFilm absorption moisture, sensor for temperature and the humidity of utilizing optic fibre environment and long period fiber grating to form are all very responsive, and sensitivity coefficient is different simultaneously, measures when adopting sensitive matrix to reach humidity and temperature.Sensor construction is compact simply, volume is little, cost is low.
Description of drawings
Fig. 1 is a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror of the utility model structural representation of survey sensor simultaneously.
Embodiment
Below in conjunction with Figure of description, the utility model is described further.
The utility model is a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror survey sensor simultaneously, comprises wideband light source 1, spectrometer 2, optical fiber three-dB coupler 3, protects inclined to one side long period fiber grating 4, shitosan C
SFilm 5, two ports of described optical fiber three-dB coupler 3 one sides connect respectively wideband light source 1 and spectrometer 2, two ports of opposite side be connected the two ends of the inclined to one side long period fiber grating 4 of guarantor and connect respectively, form the fiber loop mirror of fiber optic loop structure, the inclined to one side long period fiber grating 4 of described guarantor is panda type polarization-preserving fiber, the cycle of inscribing on it is that 590 μ m, periodicity are 65, length is 24mm, on described shitosan CS film 5 is coated in inscription the inclined to one side long period fiber grating of guarantor 4 surfaces, namely be coated on PM-LPG.
A kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror described in the utility model working method of survey sensor simultaneously is: the light that wideband light source sends is divided into two equal bundles of the light intensity light of transmission in opposite directions through three-dB coupler, this two-beam is got back to the output of fiber coupler input/output port along the fiber optic loop reverse direction after one week of transmission, the relative phase difference that is caused by polarization maintaining optical fibre make two bundles along fiber optic loop relatively light meet, interference has occured in coupling mechanism, and the spectrum of output can be observed by the optical spectrum analysis instrument that resolution is 0.01nm.Because long period fiber grating in fiber optic loop exists, the interference spectum of output is subject to the modulation of long period fiber grating simultaneously, and the crest of different polarization states-trough point all forms regular transmission spectrum.The top layer scribbles shitosan C
SFilm can change the optical fiber effective refractive index because of the impact that is subject to humidity, so long period fiber grating and fiber loop mirror have very high sensitivity to temperature and humidity, and temperature variation Δ T and humidity Δ R
HChange can cause the drift delta λ of sensor resonant wavelength and the changes delta P of peak power.Utilize sensitive matrix, by Strength Changes Δ P and the wave length shift Δ λ at monitoring place, fiber loop mirror transmission spectrum particular resonance peak, measurement when realizing to external world relative humidity and temperature.
The utility model can realize that the simultaneously-measured gordian technique of temperature and humidity is: utilize CO
2Laser instrument writes long period fiber grating on polarization maintaining optical fibre, then couple together the formation fiber loop mirror with single-mode optical-fibre coupler, and applies one deck shitosan C protecting inclined to one side long-period gratings (PM-LPG) surface
SThe humidity-sensitive material film is used for obtaining the relative humidity of air.Along with the increase of humidity and temperature, the harmonic peak wavelength of the sensing unit PM-LPG of this Fibre Optical Sensor can present the drift of linear different directions, and corresponding Strength Changes is different.This sensor utilizes the correlation properties of PMF and LPG, by detecting wave length shift and the Strength Changes situation at its transmission spectrum specific light transmission peak, by the sensitive matrix demodulation, has successfully realized measuring when encircling mirror relative humidity and temperature on every side.
Claims (4)
1. the temperature and humidity while survey sensor based on the inclined to one side long period fiber grating ring mirror of guarantor, is characterized in that comprising wideband light source (1), spectrometer (2), optical fiber three-dB coupler (3), protect inclined to one side long period fiber grating (4), shitosan C
SFilm (5), two ports of described optical fiber three-dB coupler (3) one sides connect respectively wideband light source (1) and spectrometer (2), two ports of opposite side be connected the two ends of the inclined to one side long period fiber grating of guarantor and connect, form the ring mirror structure of optical fiber, described shitosan C
SFilm (5) is coated in protects inclined to one side long period fiber grating (4) surface.
2. a kind of temperature and humidity based on protecting inclined to one side long period fiber grating ring mirror according to claim 1 survey sensor simultaneously, it is characterized in that the inclined to one side long period fiber grating of described guarantor (4) length 60-80mm, centre wavelength 1550-1555nm, the long period fiber grating cycle is that 590 μ m, periodicity are 65.
3. a kind of temperature and humidity while survey sensor based on protecting inclined to one side long period fiber grating ring mirror according to claim 1, is characterized in that the inclined to one side long period fiber grating of described guarantor (4) is by high frequency CO
2Laser pulse inscribes on panda type polarization-preserving fiber that long period fiber grating obtains.
4. a kind of temperature and humidity while survey sensor based on protecting inclined to one side long period fiber grating ring mirror according to claim 1, is characterized in that described shitosan C
SThe hydrogel that film (5) configures by sol-gel process, its refractive index and thickness change and change along with extraneous humidity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220663250.XU CN202994329U (en) | 2012-12-03 | 2012-12-03 | Simultaneous temperature and humidity measuring sensor based on polarization-maintaining long period grating (PM-LPG) environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220663250.XU CN202994329U (en) | 2012-12-03 | 2012-12-03 | Simultaneous temperature and humidity measuring sensor based on polarization-maintaining long period grating (PM-LPG) environment |
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| CN202994329U true CN202994329U (en) | 2013-06-12 |
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| CN201220663250.XU Expired - Fee Related CN202994329U (en) | 2012-12-03 | 2012-12-03 | Simultaneous temperature and humidity measuring sensor based on polarization-maintaining long period grating (PM-LPG) environment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645145A (en) * | 2013-12-17 | 2014-03-19 | 中国计量学院 | Optical fiber hydrogen sensor |
| CN105259139A (en) * | 2015-10-22 | 2016-01-20 | 中国计量学院 | Tilted fiber bragg grating humidity sensor based on oxidized graphene and agarose composite film |
| CN105588661A (en) * | 2015-11-12 | 2016-05-18 | 哈尔滨工程大学 | Device for simultaneous measurement of single-point and regional temperatures through preserving polarization fiber grating |
| RU2744436C1 (en) * | 2019-09-30 | 2021-03-09 | Алексей Петрович Зверев | Method of detection of peatland fires |
-
2012
- 2012-12-03 CN CN201220663250.XU patent/CN202994329U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103645145A (en) * | 2013-12-17 | 2014-03-19 | 中国计量学院 | Optical fiber hydrogen sensor |
| CN105259139A (en) * | 2015-10-22 | 2016-01-20 | 中国计量学院 | Tilted fiber bragg grating humidity sensor based on oxidized graphene and agarose composite film |
| CN105588661A (en) * | 2015-11-12 | 2016-05-18 | 哈尔滨工程大学 | Device for simultaneous measurement of single-point and regional temperatures through preserving polarization fiber grating |
| CN105588661B (en) * | 2015-11-12 | 2018-07-31 | 哈尔滨工程大学 | A kind of device for realizing that single-point and regional temperature measure simultaneously using polarization-maintaining fiber grating |
| RU2744436C1 (en) * | 2019-09-30 | 2021-03-09 | Алексей Петрович Зверев | Method of detection of peatland fires |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20131203 |