CN201740734U - Refractive index sensor based on fiber Bragg grating - Google Patents
Refractive index sensor based on fiber Bragg grating Download PDFInfo
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- CN201740734U CN201740734U CN2010202566181U CN201020256618U CN201740734U CN 201740734 U CN201740734 U CN 201740734U CN 2010202566181 U CN2010202566181 U CN 2010202566181U CN 201020256618 U CN201020256618 U CN 201020256618U CN 201740734 U CN201740734 U CN 201740734U
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Abstract
The utility model relates to a refractive index sensor based on fiber Bragg grating (FBG), which solves the problems of low sensitivity and low measuring accuracy of the conventional refractive index sensor. The refractive index sensor based on FBG comprises a wideband light source, a 3-dB optical fiber coupler, corroded FBG and a spectrometer, wherein, the corroded FBG adopts FBG of which the cladding is corroded away by hydrofluoric acid; two ports on one side of the 3-dB optical fiber coupler are respectively connected with the wideband light source and the spectrometer through optical fibers, and a port on the other side of the 3-dB optical fiber coupler is connected with one end of the FBG corroded by hydrofluoric acid through an optical fiber; and the corroded FBG is completely arranged in to-be-tested chemical solution held in a beaker. The utility model is simple in structure, has improved sensitivity to concentration change of chemical solution, and can be applied to various practical projects.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of based on Fiber Bragg Grating FBG (fiber Bragg grating, index sensor FBG).
Background technology
From people's reported first such as K.O.Hill in 1978 on the germanium silicon optical fiber, continue exposure with Argon ion laser and be made into first fiber grating---Fiber Bragg Grating FBG (fiber Bragg grating with standing wave, FBG) since, the research and the application of Fiber Bragg Grating FBG have caused people's attention.Wherein FBG is widely used in sensory field, sensor based on FBG is by extraneous parameter information to be obtained in the modulation of its Prague centre wavelength, be a kind of wavelength-modulated type Fibre Optical Sensor, be mainly used in the sensing measurement of physical quantitys such as counter stress, strain, temperature, concentration, load and flexibility.Can avoid the interference of electromagnetic field based on the sensor of FBG, and can remote transmission signal and need not extra signal amplifying apparatus, the measuring accuracy height.In addition, can develop the sensor of multiple physical quantity based on FBG, thereby can realize the measurement of same sensor-based system and the many physical quantitys of instrument, give full play to the advantage that FBG sensor-based system measuring point is many, metrical information is big, this has special actual value in engineering is used.
In chemistry and biology sensor, index sensor occupies an important position.It determines the chemical constitution and the content of material by measuring change of refractive, so at aspects such as commercial production, environmental monitorings the important application meaning is arranged.Proposed at present based on long period fiber grating (long-period fiber grating, index sensor LPFG).Because LPFG has the very responsive characteristic of external variations in refractive index, so obtaining extensive studies and application aspect index sensor.But its multi-peak, bandwidth working method big and that can only adopt transmission spectrum to survey has limited its measuring accuracy and multiplexing capacity.In the general optical fiber Bragg grating, only produce the coupling between core and the core, because the existence of covering, the external change of refractive of its resonance wavelength is insensitive.If remove covering, the effective refractive index of Fiber Bragg Grating FBG can be subjected to the influence of outer refractive index, and the bragg wavelength of grating can produce mobile.Can adopt hydrofluorite corrosion standard, the Fiber Bragg Grating FBG covering be corroded, thereby realize the sensing of environment refractive index to external world.
Summary of the invention
The utility model purpose is, a measuring accuracy not high shortcoming low to susceptibility at existing index sensor, and a kind of highly sensitive, index sensor based on Fiber Bragg Grating FBG that measuring accuracy is high, simple in structure is provided.
The utility model is the technical scheme that the technical solution problem is taked:
A kind of index sensor based on Fiber Bragg Grating FBG comprises wideband light source, 3-dB fiber coupler, Fiber Bragg Grating FBG and spectrometer after corrosion; Fiber Bragg Grating FBG after corrosion is meant by the Fiber Bragg Grating FBG that is eroded covering by hydrofluorite.
3-dB fiber coupler two ports on one side carry out optical fiber with wideband light source and spectrometer respectively and are connected, the port of 3-dB fiber coupler another side with corrode through hydrofluorite after Fiber Bragg Grating FBG one end carry out optical fiber and be connected.Fiber Bragg Grating FBG after corrosion places the chemical solution to be measured by the beaker splendid attire fully.
The advantage that the utility model had: the Fiber Bragg Grating FBG of utilization after the hydrofluorite corrosion be the susceptibility of refractive index to external world, makes the utility model improve the sensitivity of chemical solution concentration change, thereby has improved measuring accuracy.The utlity model has simple in structurely in addition, the grating after the corrosion has better mechanical strength, and easy fracture and spectral bandwidth are not little, and the advantage that resolution is high has strengthened the practicality of sensor greatly, can be applied in all kinds of actual engineerings.
Description of drawings
Fig. 1 is a structural drawing of the present utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As shown in Figure 1, a kind of index sensor based on Fiber Bragg Grating FBG comprises wideband light source 1,3-dB fiber coupler 2, Fiber Bragg Grating FBG 3 and spectrometer 4 after corrosion; Fiber Bragg Grating FBG 3 after corrosion is meant by the Fiber Bragg Grating FBG that is eroded covering by hydrofluorite.
3-dB fiber coupler 2 two ports on one side carry out optical fiber with wideband light source 1 with spectrometer 4 respectively and are connected, the port of 3-dB fiber coupler 2 another sides with corrode through hydrofluorite after Fiber Bragg Grating FBG 3 one ends carry out optical fiber and be connected.Fiber Bragg Grating FBG 3 after corrosion places the chemical solution to be measured 5 by beaker 6 splendid attires fully.
The utility model is based on following principle: because after eroding covering, optical fiber is waveguide result's weak perturbation.Under the effect of evanescent wave, there are certain dependence in the effective refractive index of optical fiber and the refractive index of solution.So when the refractive index of solution changed, the effective refractive index of optical fiber changed.By λ=2n
Eff(Λ is the cycle of Bragg grating to Λ, n
EffMake the effective refractive index of core) in bragg wavelength and effective refractive index relation as can be known, when the optical fiber effective refractive index changed, bragg wavelength also can change.So can utilize the size of the mobile reflection refractive index of bragg wavelength.
The working method of the utility model device is: the light that wideband light source sends enters the FBG after the hydrofluorite corrosion, and the FBG after the hydrofluorite corrosion contacts with chemical solution.Through the FBG reflectance spectrum, bragg wavelength is moved when the solution variations in refractive index by the spectrometer monitoring.This utility model detects the chemical solution change of refractive by the amount of movement of bragg wavelength just, realizes the sensing to the chemical solution refractive index.
Claims (1)
1. the index sensor based on Fiber Bragg Grating FBG comprises wideband light source, 3-dB fiber coupler, Fiber Bragg Grating FBG and spectrometer after corrosion; Fiber Bragg Grating FBG after corrosion is meant by the Fiber Bragg Grating FBG that is eroded covering by hydrofluorite;
3-dB fiber coupler two ports on one side carry out optical fiber with wideband light source and spectrometer respectively and are connected, the port of 3-dB fiber coupler another side with corrode through hydrofluorite after Fiber Bragg Grating FBG one end carry out optical fiber and be connected; Fiber Bragg Grating FBG after corrosion places the chemical solution to be measured by the beaker splendid attire fully.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202566181U CN201740734U (en) | 2010-07-09 | 2010-07-09 | Refractive index sensor based on fiber Bragg grating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202566181U CN201740734U (en) | 2010-07-09 | 2010-07-09 | Refractive index sensor based on fiber Bragg grating |
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| CN201740734U true CN201740734U (en) | 2011-02-09 |
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| CN2010202566181U Expired - Fee Related CN201740734U (en) | 2010-07-09 | 2010-07-09 | Refractive index sensor based on fiber Bragg grating |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322894A (en) * | 2011-06-08 | 2012-01-18 | 东华大学 | Allfiber type long period fiber grating solution multi-parameter sensing system |
| CN102645237A (en) * | 2012-05-03 | 2012-08-22 | 浙江大学 | Method and device for manufacturing low-loss micro-nanometer fiber bragg grating sensor in chemical corrosion method |
| CN102706825A (en) * | 2012-06-26 | 2012-10-03 | 东北大学秦皇岛分校 | Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG) |
| CN102721665A (en) * | 2012-05-16 | 2012-10-10 | 暨南大学 | Micro nano optical fiber grating refractive index sensor |
| CN104089927A (en) * | 2014-07-23 | 2014-10-08 | 中国计量学院 | Temperature insensitive solution concentration sensor based on semi-corrosion optical fiber grating |
| CN107044968A (en) * | 2017-04-06 | 2017-08-15 | 南京航空航天大学 | A kind of transformer oil product test device based on Fibre Optical Sensor |
| CN109443973A (en) * | 2018-12-12 | 2019-03-08 | 中国计量大学 | Steel reinforcement corrosion sensor in a kind of marine environment based on TFBG |
| CN109596570A (en) * | 2018-10-24 | 2019-04-09 | 昆明理工大学 | A kind of biochemical sensitive system based on Si-based photodetectors |
-
2010
- 2010-07-09 CN CN2010202566181U patent/CN201740734U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322894A (en) * | 2011-06-08 | 2012-01-18 | 东华大学 | Allfiber type long period fiber grating solution multi-parameter sensing system |
| CN102322894B (en) * | 2011-06-08 | 2013-01-02 | 东华大学 | Allfiber type long period fiber grating solution multi-parameter sensing system |
| CN102645237A (en) * | 2012-05-03 | 2012-08-22 | 浙江大学 | Method and device for manufacturing low-loss micro-nanometer fiber bragg grating sensor in chemical corrosion method |
| CN102721665A (en) * | 2012-05-16 | 2012-10-10 | 暨南大学 | Micro nano optical fiber grating refractive index sensor |
| CN102721665B (en) * | 2012-05-16 | 2014-12-03 | 暨南大学 | Micro nano optical fiber grating refractive index sensor |
| CN102706825A (en) * | 2012-06-26 | 2012-10-03 | 东北大学秦皇岛分校 | Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG) |
| CN102706825B (en) * | 2012-06-26 | 2014-02-26 | 东北大学秦皇岛分校 | Method and system for measuring concentration of chemical solution by fiber bragg gratings (FBG) |
| CN104089927A (en) * | 2014-07-23 | 2014-10-08 | 中国计量学院 | Temperature insensitive solution concentration sensor based on semi-corrosion optical fiber grating |
| CN107044968A (en) * | 2017-04-06 | 2017-08-15 | 南京航空航天大学 | A kind of transformer oil product test device based on Fibre Optical Sensor |
| CN109596570A (en) * | 2018-10-24 | 2019-04-09 | 昆明理工大学 | A kind of biochemical sensitive system based on Si-based photodetectors |
| CN109443973A (en) * | 2018-12-12 | 2019-03-08 | 中国计量大学 | Steel reinforcement corrosion sensor in a kind of marine environment based on TFBG |
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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: 20110209 Termination date: 20110709 |