CN202075306U - FBG (fiber bragg grating) acceleration transducer based on tapered structure - Google Patents
FBG (fiber bragg grating) acceleration transducer based on tapered structure Download PDFInfo
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- CN202075306U CN202075306U CN2010206183446U CN201020618344U CN202075306U CN 202075306 U CN202075306 U CN 202075306U CN 2010206183446 U CN2010206183446 U CN 2010206183446U CN 201020618344 U CN201020618344 U CN 201020618344U CN 202075306 U CN202075306 U CN 202075306U
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- acceleration transducer
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Abstract
The utility model relates to an FBG (giber bragg grating) acceleration transducer based on a tapered structure, which uses a strength demodulating method to realize acceleration measurement and uses a compact structure to solve the problems of complex structure and high price of the general fiber sensor. The FBG acceleration transducer based on the tapered structure comprises a broadband light source (1), a photoelectric detector (2), a fiber coupler (3), a fixing device (4), a single mode fiber tapered area (5), a fiber bragg grating (6) and a weight with certain mass and is particularly characterized in that after a section of single mode fiber is subject to tapered treatment and then is connected with the fiber bragg grating in series to be used as a transducer head, the transducer head is connected with the light source and the photoelectric detector respectively through the fiber coupler to form the FBG acceleration transducer system. The FBG acceleration transducer has small volume, simplicity in structure and strong operability and can be widely used in various acceleration monitoring fields.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to a kind of based on the optical fibre grating acceleration sensor that draws wimble structure.
Background technology
Fibre Optical Sensor is compared with traditional electric formula sensor, has unique advantage: highly sensitive, in light weight, volume is little, anti-electromagnetic interference (EMI), corrosion-resistant, essential safety.Because Fibre Optical Sensor is to utilize light wave transmissions information, and optical fiber can be used as electrical isolation, corrosion resistant transmission medium, and this makes it can be used for strong electromagnetic such as various large-scale electromechanics, seismic event detection, petrochemical complex, mine and rugged surroundings such as inflammable and explosive easily and effectively.
Varied with optical fiber as the mechanism of acceleration analysis media, and based on the acceleration transducer of Fiber Bragg Grating FBG with its better simply principle--adopt wavelength shift that acceleration change causes or reflected optical power to change to carry out demodulation to obtain acceleration information, and be subject to people's attention.Optical fibre grating acceleration sensor is constantly development since coming out, be widely used in the vibration detection of seismic prospecting, petrochemical complex, highway, bridge and the aspects such as structural health detection of buildings, therefore study optical fibre grating acceleration sensor and have great importance.
In several optical fibre grating acceleration sensors of having reported, the foveal reflex wavelength that great majority are based on the measuring optical fiber grating obtains tested parameter information.This type of fiber-optic grating sensor, in order to carry out the reflection wavelength variation that sensing measurement must detect fiber grating, in testing process, need to use expensive wavelength measurement instrument such as fiber spectrometer, wavelength demodulation device etc., limited it in actual application in engineering.In recent years, the development of optical fibre grating acceleration sensor is subjected to especially paying close attention to cheaply.
Summary of the invention
The purpose of this utility model be at costing an arm and a leg of existing of existing fiber grating acceleration transducer, sensitivity is not high and can not carry out the shortcoming of intensity demodulation, has proposed a kind of simplicity of design, compact conformation, highly sensitive, lower-cost based on the optical fibre grating acceleration sensor that draws wimble structure.
The utility model is that the technical scheme that the technical solution problem is taked is:
A kind of based on the optical fibre grating acceleration sensor that draws wimble structure, comprise that wideband light source, photodetector, fiber coupler, stationary installation, single-mode fiber draw the weight of awl zone, fiber grating and certain mass.
At first a section single-mould fiber is drawn awl to handle, connect as sensing head with fiber grating then, be connected with photodetector with light source respectively, form the optical fibre grating acceleration sensor-based system by fiber coupler.
The advantage that the utility model had:
1. to draw the awl zone (awl district) and the general single mode fiber of fiber grating be sensing head to comprise, have advantages such as compact conformation, the sensing head volume is little, cost of manufacture is low, can be widely used in the abominable or engineering field strict of environment of various acceleration monitorings size sensor.
2. the bending change in the luminous power of the fiber grating reflection awl district that can cause along with acceleration produces leakage loss, shows as the variation of photodetector output.Therefore has advantage highly sensitive, that the apparatus for sensing demodulating cost is low.
Description of drawings
Fig. 1 is optical fibre grating acceleration sensor-based system figure of the present utility model
Fig. 2 is for of the present utility model based on the optical fibre grating acceleration sensor synoptic diagram that draws wimble structure.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
As Fig. 1, a kind of shown in 2 based on the optical fibre grating acceleration sensor that draws wimble structure, mainly comprise wideband light source 1, photodetector 2, fiber coupler 3, stationary installation 4, single-mode fiber awl district 5 and fiber grating 6.Wideband light source 1 links to each other with an end of 1 * 2 fiber coupler 3, and the other end of fiber coupler 3 is connected to an end in single-mode fiber awl district 5, and the other end of fiber coupler 3 links to each other with photodetector 2, and the other end in process optical taper district 5 is connected with fiber grating 6.Use stationary installation 4 that an end of close the coupling mechanism 3 in optical taper district 5 is fixed,, make the certain initial bending of optical taper district 5 generations at the optical fiber free end fixing weight 7 of certain mass as required.
Draw the optical fiber of wimble fraction to girdle the waist and can draw the awl time to obtain different-effect by control, draw long more its optical fiber of awl time with a tight waist thin more, the transducer sensitivity of its formation be high more.The wavelength of fiber grating should be included within the spectral range of light source, can be in the C-band of 1520-1565nm.One end of single-mode fiber draws the optical fiber of awl to be connected with process, and the other end is connected with one 1 * 2 fiber coupler.The two ends in addition of fiber coupler are connected with photodetector respectively at wideband light source.
The working method of the utility model device is: the light that is sent by wideband light source enters optical taper district and fiber grating successively behind fiber coupler, and the light that fiber grating reflects is once more through being surveyed by photodetector behind awl district and the coupling mechanism.Because the loss in optical taper district changes with the difference of its degree of crook, when acceleration acts on sensor, the fixing weight of optical fiber and optical fiber free end is subjected to the effect of power, the bending in awl district is affected, follow acceleration change, so the power that photodetector detects also can be along with acceleration change.Just can demodulate the information of acceleration from the output of photodetector.
The key that the utility model device can be measured acceleration is: single-mode fiber is responsive to bending through its loss after drawing awl, and acceleration can cause the bending change in optical taper district, and the power of the light of fiber grating reflection is changed.This kind is based on the optical fibre grating acceleration sensor compact conformation that draws wimble structure, highly sensitive, anti-electromagnetic interference (EMI), can be implemented in the good measurement effect in 0～50Hz frequency range, for little vibration field provides a kind of effective measuring method, and monitoring device only needs photodetector cheaply, therefore cost is lower, practical.
Claims (1)
1. one kind based on the optical fibre grating acceleration sensor that draws wimble structure, comprise that wideband light source (1), photodetector (2), fiber coupler (3), stationary installation (4), single-mode fiber draw the weight (7) of awl zone (5), fiber grating (6) and certain mass, it is characterized in that: draw awl processing back and fiber grating series connection as sensing head one section single-mould fiber, be connected with photodetector with light source respectively by fiber coupler, form the optical fibre grating acceleration sensor-based system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206183446U CN202075306U (en) | 2010-11-19 | 2010-11-19 | FBG (fiber bragg grating) acceleration transducer based on tapered structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206183446U CN202075306U (en) | 2010-11-19 | 2010-11-19 | FBG (fiber bragg grating) acceleration transducer based on tapered structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202075306U true CN202075306U (en) | 2011-12-14 |
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| CN2010206183446U Expired - Fee Related CN202075306U (en) | 2010-11-19 | 2010-11-19 | FBG (fiber bragg grating) acceleration transducer based on tapered structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215610B (en) * | 2014-06-16 | 2017-02-15 | 中国计量学院 | Plasma resonance chamber-based fiber surface plasma sensor |
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
| CN108332841A (en) * | 2018-04-23 | 2018-07-27 | 哈尔滨工业大学深圳研究生院 | A kind of optical fibre vibration sensor |
-
2010
- 2010-11-19 CN CN2010206183446U patent/CN202075306U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215610B (en) * | 2014-06-16 | 2017-02-15 | 中国计量学院 | Plasma resonance chamber-based fiber surface plasma sensor |
| CN106842077A (en) * | 2017-03-21 | 2017-06-13 | 中国计量大学 | A kind of magnetic field sensor that magnetic fluid is coated based on silver-plated inclined optical fiber grating |
| CN108332841A (en) * | 2018-04-23 | 2018-07-27 | 哈尔滨工业大学深圳研究生院 | A kind of optical fibre vibration sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20111214 Termination date: 20121119 |