CN208672200U - A kind of device carrying out stress measurement using optical fiber ring laser - Google Patents
A kind of device carrying out stress measurement using optical fiber ring laser Download PDFInfo
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- CN208672200U CN208672200U CN201821696005.2U CN201821696005U CN208672200U CN 208672200 U CN208672200 U CN 208672200U CN 201821696005 U CN201821696005 U CN 201821696005U CN 208672200 U CN208672200 U CN 208672200U
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- optical fiber
- coupler
- fiber
- wavelength
- ring laser
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Abstract
The utility model discloses a kind of devices that stress measurement is carried out using optical fiber ring laser, 980nm pump light source, wavelength-division multiplex, Er-doped fiber, fiber grating, the first coupler and the second coupler being connected by optical fiber are successively arranged along optical transmission direction, it is connected between wavelength-division multiplex input terminal and the first coupler output by optical fiber and is tested tension type winding optical fiber, second coupler output passes through optical fiber respectively and is connected with spectrometer and photodetector, and photodetector is connected by route with spectrum analyzer.The utility model is not only simple in structure, is low in cost, and converts electric signal measurement for optical signal measurement, convenient that data are further processed.
Description
Technical field
The utility model belongs to optical fiber sensing temperature measuring device technical field, and in particular to a kind of to utilize optical fiber ring laser
Carry out the device of stress measurement.
Background technique
Nowadays the development of wavelength-division multiplex technique, erbium-doped fiber amplifier technology and Optical Time Division Multiplexing Technology is mature, light
Fiber communication technology is also developing towards the direction of ultrahigh speed and high Capacity Communication System, and gradually advances to all-optical network.
And optical fiber sensing technology is the development with Fibre Optical Communication Technology and is developed rapidly, and has electromagnetism interference, simplicity, spirit
The characteristics of sensitivity etc., military affairs, space flight and aviation, the energy, environmental protection, Industry Control, medical and health, metrology and measurement, building and
There is wide market in the fields such as household electrical appliance.Fibre Optical Sensor includes two kinds of functions of perception and transmission to outer signals.Wherein
Perception refers to that outer signals make the physical features parameter of the light wave transmitted in a fiber change according to its changing rule, measures
The variation of optical parameter detects the variation of outer signals, and substantially outer signals are to the light wave modulated in real time propagated in optical fiber；
And transmit and refer to that optical fiber detects the light wave transmissions modulated by outer signals to optical detector, by outer signals from light wave
In extract and carry out data processing as needed, that is, demodulate.Therefore, optical fiber sensing technology includes two side of modulation and demodulation
The technology in face, that is, be measured how the light wave parameter in modulation optical fiber modulation technique and how to be extracted from the light wave modulated
Tested detection technique.
In sensory field of optic fibre, optical fiber laser has many advantages, such as high s/n ratio, low cost, electromagnetism interference, is sensing
Field has a wide range of applications.In multi-mode optical fiber laser sensing system, beat frequency demodulation techniques are cheap with its, performance
The advantages that stablizing is widely used.Pass through measurement distributed feedback optical fiber laser and distributed Blatt reflective optical-fiber laser
Beat signal between two polarization modes of device, can detecte the parameters such as strain, temperature, load, bending and ultrasound.
Summary of the invention
There is provided a kind of simple, the low in cost and measurement accuracy of design is higher for the technical issues of the utility model solves
The device of stress measurement is carried out using optical fiber ring laser, which is become by analysis laser beat frequency frequency and measured stress
The relationship of change realizes beat frequency with the steady change of wavelength, and then carries out stress measurement based on optical fiber ring laser.
The utility model adopts the following technical scheme that solve above-mentioned technical problem, it is a kind of using optical fiber ring laser into
The device of row stress measurement, it is characterised in that: along optical transmission direction be successively arranged by optical fiber be connected 980nm pump light source,
Wavelength-division multiplex, Er-doped fiber, fiber grating, the first coupler and the second coupler, wavelength-division multiplex input terminal and the first coupler
It is connected between output end by optical fiber and is tested tension type winding optical fiber, the second coupler output passes through optical fiber and spectrum respectively
Instrument is connected with photodetector, and photodetector is connected by route with spectrum analyzer.
Further preferably, the wavelength-division multiplex, Er-doped fiber, fiber grating, the first coupler and it is tested tension type winding
Optical fiber constitutes annular chamber.
Further preferably, first coupler and the second coupler are the coupler of 90:10, wherein the second coupler
The port of output 10% is connected by optical fiber with spectrometer, and the port of the second coupler output 90% passes through optical fiber and photodetector
It is connected.
The utility model has the sensing function of beat frequency demodulation, using the side of laser transmission mode in stress changes annular chamber
Method converts measured variation to the variation of wavelength, achievees the purpose that Wavelength demodulation realizes sensing measurement.The device passes through two
Beat signal between a polarization mode measures, so do not influenced by system loss and light source fluctuation, using laser beat frequency at
Function realizes the measurement to stress, has preferable stability.
The utility model is not only simple in structure, is low in cost, and converts electric signal measurement for optical signal measurement, convenient
Data are further processed, are conducive to further analyze.
Detailed description of the invention
Fig. 1 is the optical path connection figure of the utility model.
In figure: 1-980nm pump light source, 2- wavelength-division multiplex, 3- Er-doped fiber, 4- fiber grating, the first coupler of 5-, 6-
It is tested tension type winding optical fiber, the second coupler of 7-, 8- spectrometer, 9- photodetector, 10- spectrum analyzer.
Specific embodiment
The technical solution of the utility model is described in detail in conjunction with attached drawing.As shown in Figure 1, a kind of utilize optical fiber ring laser
The device for carrying out stress measurement is successively arranged along optical transmission direction through the connected 980nm pump light source 1 of optical fiber, wavelength-division multiplex
2, Er-doped fiber 3, fiber grating 4, the first coupler 5 and the second coupler 7,2 input terminal of wavelength-division multiplex and the first coupler 4 are defeated
Be connected between outlet by optical fiber and be tested tension type winding optical fiber 6, wherein wavelength-division multiplex 2, Er-doped fiber 3, fiber grating 4,
First coupler 5 constitutes annular chamber with tension type winding optical fiber 6 is tested, and the first coupler 5 and the second coupler 7 are 90:10
Coupler, wherein the port of the second coupler 7 output 10% is connected by optical fiber with spectrometer 8, the second coupler 7 exports 90%
Port be connected with photodetector 9 by optical fiber, photodetector 9 passes through route and is connected with spectrum analyzer 10.
The utility model utilizes optical fiber ring laser, measures strain by the BFS of two kinds of monitoring different longitudinal intermodes,
If also detecting the BFS of polarization intermode, so that it may realize two-parameter measurement.Firstly, being provided by 980nm pump light source a branch of
Light source enters in optical fiber ring laser after wavelength-division multiplex, constitutes toroidal cavity resonator with the first coupler.Fiber annular
It is equipped in laser and provides the erbium-doped fiber of enough gains for multimode light, generate Multi-Longitudinal Mode laser in annular chamber, BFS is by any
Two different vertical patterns generate.The laser of first coupler is divided into two parts, the output of the second coupler by the second coupler
10% port connects spectrometer, and for monitoring the spectrum of laser, the port of the second coupler output 90%, which is connected to, generates BFS's
On photodetector, BFS is monitored by frequency spectrograph.Change the strain of optical fiber cavity by stretching the optical fiber of winding, works as multimode
When the measured stress that optical fiber is subject to changes, inner laser mode is caused to change, since the laser of different wave length is logical
The beat frequency difference generated after fiber resonance cavity is crossed, the beat signal detected on frequency spectrograph can also change, and pass through observation
Corresponding relation between the beat signal and stress arrived is to be measured, it can be deduced that in the case where a series of different stress intensities,
Conversion relation between stress and beat signal suffered by multimode fibre achievees the effect that accurately to realize stress measurement.
The utility model constitutes fiber resonance cavity by optical fiber ring laser, multiple by wavelength-division using 980nm pump light source
With fiber resonance cavity is entered, the optical fiber by stretching winding changes intracavitary strain, when what multimode fibre was subject to measured answers
When power changes, it will lead to inner laser mode and change, since the laser of different wave length passes through after fiber resonance cavity
The beat frequency of generation is different, and the beat signal detected on frequency spectrograph can also change, the beat signal by observing and
A series of corresponding relation between stress is to be measured, it can be deduced that in the case where different stress intensities, answered suffered by multimode fibre
Conversion relation between power and beat signal achievees the effect that accurately to realize stress measurement.The knot of this optical fiber ring laser
Structure is simple, and performance is stablized, and sensitivity with higher.
The basic principle of the utility model, main feature and advantage has been shown and described above, it is practical new not departing from this
Under the premise of type spirit and scope, there are also various changes and modifications, these changes and improvements both fall within requirement and protect the utility model
The scope of the utility model of shield.
Claims (3)
1. a kind of device for carrying out stress measurement using optical fiber ring laser, it is characterised in that: successively set along optical transmission direction
There are 980nm pump light source, wavelength-division multiplex, Er-doped fiber, fiber grating, the first coupler and the second coupling being connected by optical fiber
Device is connected with by optical fiber between wavelength-division multiplex input terminal and the first coupler output and is tested tension type winding optical fiber, and second
Coupler output passes through optical fiber respectively and is connected with spectrometer and photodetector, and photodetector passes through route and spectrum analysis
Instrument is connected.
2. the device according to claim 1 for carrying out stress measurement using optical fiber ring laser, it is characterised in that: described
It wavelength-division multiplex, Er-doped fiber, fiber grating, the first coupler and is tested tension type winding optical fiber and constitutes annular chamber.
3. the device according to claim 1 for carrying out stress measurement using optical fiber ring laser, it is characterised in that: described
First coupler and the second coupler are the coupler of 90:10, wherein the second coupler output 10% port by optical fiber with
Spectrometer is connected, and the port of the second coupler output 90% is connected by optical fiber with photodetector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821696005.2U CN208672200U (en) | 2018-10-19 | 2018-10-19 | A kind of device carrying out stress measurement using optical fiber ring laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821696005.2U CN208672200U (en) | 2018-10-19 | 2018-10-19 | A kind of device carrying out stress measurement using optical fiber ring laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208672200U true CN208672200U (en) | 2019-03-29 |
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ID=65820643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821696005.2U Expired - Fee Related CN208672200U (en) | 2018-10-19 | 2018-10-19 | A kind of device carrying out stress measurement using optical fiber ring laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208672200U (en) |
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2018
- 2018-10-19 CN CN201821696005.2U patent/CN208672200U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190329 Termination date: 20191019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |