CN205449354U - Device for stress measurement with multimode fiber - Google Patents
Device for stress measurement with multimode fiber Download PDFInfo
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- CN205449354U CN205449354U CN201620150273.9U CN201620150273U CN205449354U CN 205449354 U CN205449354 U CN 205449354U CN 201620150273 U CN201620150273 U CN 201620150273U CN 205449354 U CN205449354 U CN 205449354U
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- fiber
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- beat frequency
- stress
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Abstract
The utility model discloses a device for stress measurement with multimode fiber is equipped with 980 pump light sources, wavelength devision multiplex, the fiber grating that link to each other through optic fibre in proper order, mixes bait optic fibre, multimode fiber and circulator along light transmission direction, wherein fiber grating and circulator constitution fiber resonance cavity, and it is continuous with photoelectric detector and spectral analyser in proper order that wavelength devision multiplex passes through optic fibre. The utility model discloses a beat frequency frequency change measure, so do not receive system loss and light source fluctuation's influence, utilizes the laser beat frequency successfully to realize the measurement of counter stress, and stability is good, and the device is simple structure, low cost not only, turns into electric signal measurement being bare signal measurement moreover, makes things convenient for for data processing provides.
Description
Technical field
This utility model belongs to Fibre Optical Sensor measurement apparatus technical field, is specifically related to a kind of device utilizing multimode fibre to carry out stress measurement.
Background technology
Along with close wavelength-division multiplex technology, erbium-doped fiber amplifier technology and the development of Optical Time Division Multiplexing Technology and maturation, Fibre Optical Communication Technology just develops towards the direction of ultrahigh speed, high Capacity Communication System, and progressively to all-optical network evolution.Optical fiber sensing technology is the important symbol weighing a national information degree.Optical fiber sensing technology, develops rapidly in unique advantages of aspect such as electromagnetism interference, simplicity, sensitivity with it.Optical fiber sensing technology has wide market in fields such as military affairs, national defence, space flight and aviation, industrial and mining establishment, the energy, environmental protection, Industry Control, medical and health, metrology and measurement, building and household electrical appliance.Fibre Optical Sensor comprises perception and two kinds of functions of transmission of signal (measured) to external world.So-called perception (or sensitive) refers to that outer signals makes the physical features parameter of the light wave of transmission in optical fiber according to its Changing Pattern, changing such as intensity (power), wavelength, frequency, phase place and polarization state etc., the change measuring optical parameter is the change of " perception " outer signals.This " perception " the substantially outer signals light wave modulated in real time to propagating in optical fiber.So-called transmission refers to that the light wave transmissions modulated by outer signals is detected by optical fiber to photo-detector, outer signals is extracted from light wave and carries out data process on demand, namely demodulating.Therefore, optical fiber sensing technology includes technology of both modulation and demodulation, the modulation technique of the light wave parameter in the most measured how modulation optical fiber and how to extract tested detection technique from the light wave modulated.At sensory field of optic fibre, the application prospect of multimode fiber sensors is the most wide, this sensor ratio Bragg diffraction Fibre Optical Sensor highly sensitive, the ratio simple in construction of microstructure fiber sensor the most again, multimode fiber sensors has simple in construction, is compact, easy to a series of advantages such as manufacture and low price.
Summary of the invention
This utility model solves the technical problem that there is provided and a kind of designs simple, with low cost and that certainty of measurement the is high device utilizing multimode fibre to carry out stress measurement, this device is by analyzing laser beat frequency frequency and the relation of measured STRESS VARIATION, achieve the beat frequency steady change with wavelength, and then carry out the measurement of stress based on multimode fibre.
This utility model is for adopting the following technical scheme that for the above-mentioned technical problem of solution, a kind of device utilizing multimode fibre to carry out stress measurement, it is characterized in that: be sequentially provided with 980 pump light sources, wavelength-division multiplex, fiber grating, erbium-doped fiber, multimode fibre and the circulator being connected by optical fiber along optical transmission direction, wherein fiber grating and circulator constitute fiber resonance cavity, and wavelength-division multiplex is connected with photodetector and spectrum analyzer successively by optical fiber.
The laser instrument that this utility model is constituted by using fiber grating, erbium-doped fiber and circulator realizes beat frequency, use the method for Laser Transmission pattern in stress changes multimode fibre, measured change is converted into wavelength change, reaches Wavelength demodulation and realize the purpose of sensing measurement.This device is changed by beat frequency rate to be measured, so not affected by system loss and light source fluctuation, utilizes laser beat frequency to be successfully realized the measurement of counter stress, good stability.This device is not only simple in structure, with low cost, and optical signal measurement is converted into electric signal measurement, processes for data and provides conveniently.
Accompanying drawing explanation
Fig. 1 is light path connection figure of the present utility model.
In figure: 1,980 pump light source, 2, wavelength-division multiplex, 3, fiber grating, 4, erbium-doped fiber, 5, multimode fibre, 6, circulator, 7, photodetector, 8, spectrum analyzer.
Detailed description of the invention
Particular content of the present utility model is described in detail in conjunction with accompanying drawing.A kind of device utilizing multimode fibre to carry out stress measurement, 980 pump light sources 1, wavelength-division multiplex 2, fiber grating 3, erbium-doped fiber 4, multimode fibre 5 and the circulator 6 being connected by optical fiber it is sequentially provided with along optical transmission direction, wherein fiber grating 3 and circulator 6 constitute fiber resonance cavity, and wavelength-division multiplex 2 is connected with photodetector 7 and spectrum analyzer 8 successively by optical fiber.
This utility model utilizes the change of laser beat frequency frequency and multimode fibre to be changed by the pattern of internal transmission laser after extraneous stress stimulation, and then makes laser beat frequency change, and causes the beat frequency rate observed on spectrum analyzer to change the most therewith.First, a branch of light source is provided by 980 pump light sources, enter into after wavelength-division multiplex in fiber resonance cavity, fiber resonance cavity is provided with the erbium-doped fiber of non-linear gain, when pumping current reaches threshold value, many longitudinal-mode beat frequencies are produced, it can be seen that stable laser beat frequency signal on spectrum analyzer in fiber resonance cavity.When the measured stress that multimode fibre is subject to changes, inner laser pattern is caused to change, owing to the laser of different wave length is different by the beat frequency produced after fiber resonance cavity, the beat frequency rate detected on spectrum analyzer also respective change, by the beat frequency rate observed and the stress corresponding relation between to be measured, can draw in the case of a series of different stress intensities, conversion relation between stress and beat frequency rate suffered by multimode fibre, reaches accurately to realize the effect of stress measurement.
This utility model is constituted fiber resonance cavity by fiber grating and circulator, the pump light source using 980nm enters fiber resonance cavity by wavelength-division multiplex, fiber resonance cavity is provided with the erbium-doped fiber of non-linear gain, when pumping current reaches threshold value, many longitudinal-mode beat frequencies are produced, it can be seen that stable laser beat frequency signal on spectrum analyzer in resonator cavity.When measured stress acts on multimode fibre, the pattern of multimode fibre inner laser changes, the laser beat frequency that different wave length is produced gets up with corresponding STRESS VARIATION corresponding relationship, so that the measurement that multimode fibre is stressed size is converted into the measurement of laser beat frequency frequency change, so not affected by system loss and light source fluctuation, laser beat frequency is utilized to be successfully realized the measurement of measured stress, simple in construction and good stability.
Of the present utility model ultimate principle and principal character have more than been shown and described, and on the premise of without departing from this utility model spirit and scope, this utility model also has various changes and modifications, and these changes and improvements both fall within claimed scope of the present utility model.
Claims (1)
1. one kind utilizes the device that multimode fibre carries out stress measurement, it is characterized in that: be sequentially provided with 980 pump light sources, wavelength-division multiplex, fiber grating, erbium-doped fiber, multimode fibre and the circulator being connected by optical fiber along optical transmission direction, wherein fiber grating and circulator constitute fiber resonance cavity, and wavelength-division multiplex is connected with photodetector and spectrum analyzer successively by optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620150273.9U CN205449354U (en) | 2016-02-29 | 2016-02-29 | Device for stress measurement with multimode fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620150273.9U CN205449354U (en) | 2016-02-29 | 2016-02-29 | Device for stress measurement with multimode fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205449354U true CN205449354U (en) | 2016-08-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620150273.9U Expired - Fee Related CN205449354U (en) | 2016-02-29 | 2016-02-29 | Device for stress measurement with multimode fiber |
Country Status (1)
| Country | Link |
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| CN (1) | CN205449354U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768871A (en) * | 2016-11-14 | 2017-05-31 | 河南师范大学 | Method based on photoswitch laser beat frequency systematic survey fibre-optical dispersion |
| WO2019205028A1 (en) * | 2018-04-25 | 2019-10-31 | 深圳大学 | Optical fiber laser pressure sensor and pressure measurement method therefor |
-
2016
- 2016-02-29 CN CN201620150273.9U patent/CN205449354U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768871A (en) * | 2016-11-14 | 2017-05-31 | 河南师范大学 | Method based on photoswitch laser beat frequency systematic survey fibre-optical dispersion |
| WO2019205028A1 (en) * | 2018-04-25 | 2019-10-31 | 深圳大学 | Optical fiber laser pressure sensor and pressure measurement method therefor |
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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: 20160810 Termination date: 20170229 |
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| CF01 | Termination of patent right due to non-payment of annual fee |