CN206601208U - A kind of utilization chirped fiber grating realizes the device of stress measurement - Google Patents
A kind of utilization chirped fiber grating realizes the device of stress measurement Download PDFInfo
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- CN206601208U CN206601208U CN201720200689.1U CN201720200689U CN206601208U CN 206601208 U CN206601208 U CN 206601208U CN 201720200689 U CN201720200689 U CN 201720200689U CN 206601208 U CN206601208 U CN 206601208U
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- fiber
- chirped
- fiber grating
- grating
- loop mirror
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Abstract
The utility model discloses the device that a kind of utilization chirped fiber grating realizes stress measurement, 980nm pump light sources, wavelength division multiplexer, Er-doped fiber, LPFG and the fiber loop mirror being connected by optical fiber are sequentially provided with along optical transmission direction, chirped fiber grating is connected by optical fiber with wavelength division multiplexer, chirped fiber grating and fiber loop mirror constitute fiber resonance cavity, and fiber loop mirror is connected with photodetector and spectrum analyzer successively by optical fiber.The utility model is not only simple in structure, with low cost, and optical signal measurement is converted into electric signal measurement by photodetector, becomes more to facilitate in data processing.
Description
Technical field
The utility model belongs to stress measurement device technical field, and in particular to one kind is realized using chirped fiber grating should
The device of power measurement.
Background technology
Optical fiber sensing technology has the advantages that small volume, good reliability, electromagnetism interference and corrosion-resistant, therefore light due to it
Fine sensing technology has in information gathering, transmission and propagation to be applied well, increasingly by researcher and major application industries
Concern.Research contents coverage is also extensive in the extreme, including for measuring strain, vibration, electric current, voltage, magnetic field, temperature
With the fibre optical sensor of the physical quantity such as the underwater sound, and the measurement of stress is realized using chirped fiber grating.
In recent years, fiber grating is found under accidentalia and progresses into the visual field of people.Writing Technology it is quick
Develop the fast development for successfully promoting fiber grating passive device, the growing maturation of manufacturing technology of fiber grating.Optical fiber
Grating changes the longitudinal refractive index of fiber core essentially by certain means, it is produced formed by cyclically-varying
One class novel optical element, the fiber grating being made changes the approach that light is propagated along light, has its light to certain wavelength
There is larger transmissivity, there is larger emissivity to another part light.Fiber grating is to utilize its optical characteristics with temperature, answer
The change of the physical quantitys such as power is sensed, in military affairs, national defence, space flight and aviation, industrial and mining enterprises, the energy, environmental protection, Industry Control, doctor
There is wide market in the fields such as medicine health, metrology and measurement, building and household electrical appliance.For stress measurement in all fields all
It is in need, and the device of traditional measurement stress due to heavy, poor sensitivity and it is expensive the shortcomings of, it is difficult to adapt to current engineering
The need for industry.And design a utilization chirped fiber grating with low cost, simple in construction and high sensitivity and realize stress
The device of measurement is particularly important.
The content of the invention
The technical problem that the utility model is solved there is provided a kind of simple in construction, with low cost and have compared with high measurement essence
The utilization chirped fiber grating of degree realizes the device of stress measurement.
The utility model adopts the following technical scheme that one kind is realized using chirped fiber grating to solve above-mentioned technical problem
The device of stress measurement, it is characterised in that be sequentially provided with the 980nm pump light sources being connected by optical fiber, wavelength-division along optical transmission direction
Multiplexer, Er-doped fiber, LPFG and fiber loop mirror, chirped fiber grating pass through optical fiber and wavelength division multiplexer phase
Even, chirped fiber grating and fiber loop mirror constitute fiber resonance cavity, fiber loop mirror by optical fiber successively with photodetector and frequency
Spectrometer is connected.
The utility model constitutes fiber resonance cavity by chirped fiber grating and fiber loop mirror, coordinates Er-doped fiber to constitute laser
Device.Its mechanism of action is to provide a branch of light source by 980nm pump light sources, is entered in fiber resonance cavity, in fiber resonance cavity,
Because the light that the erbium-doped fiber of non-linear gain is ejected constantly is exaggerated in fiber resonance cavity, when pump light source reaches
During threshold value, by the filtering of the LPFG with antiradar reflectivity, the output of laser can be detected, passes through frequency spectrum
Instrument is it is seen that laser beat frequency signal.When LPFG is by extraneous stress variation, LPFG
Centre wavelength can drift about, the operation wavelength of optical fiber laser and then change, because the delay volume of selection is big, linear
The chirped fiber grating spent, the resonator length of optical fiber can change, and cause laser beat frequency frequency to change.By dividing
The relation of beat frequency rate and laser works wavelength is analysed, it is established that beat frequency and the corresponding relation of extraneous stress, so as to realize externally
The purpose of boundary's stress sensing measurement.The device utilizes the delay character of chirped fiber grating, by extraneous stress for long period light
The effect of fine grating is converted to the beat frequency rate change that can be detected, and which is simple, be easy to measurement, and not by light source fluctuation
With the influence of system loss, stability is good.
The utility model is not only simple in structure, with low cost, and optical signal measurement is converted into by photodetector
Electric signal measurement, becomes more to facilitate in data processing.
Brief description of the drawings
Fig. 1 is the light path connection figure of the present invention.
In figure：1st, chirped fiber grating, 2,980nm pump light sources, 3, wavelength division multiplexer, 4, erbium-doped fiber, 5, long period
Fiber grating, 6, fiber loop mirror, 7, photodetector, 8, spectrum analyzer.
Embodiment
Particular content of the present utility model is described in detail with reference to accompanying drawing.As shown in figure 1, a kind of real using chirped fiber grating
The device of existing stress measurement, the 980nm pump light sources 2 being connected by optical fiber, wavelength division multiplexer are sequentially provided with along optical transmission direction
3rd, Er-doped fiber 4, LPFG 5 and fiber loop mirror 6, chirped fiber grating 1 pass through optical fiber and the phase of wavelength division multiplexer 3
Even, chirped fiber grating 1 and fiber loop mirror 6 constitute fiber resonance cavity, fiber loop mirror 6 by optical fiber successively with photodetector 7
It is connected with spectrum analyzer 8.
The utility model utilizes the delay character of chirped fiber grating, will act at the change of LPFG upper stress
Change the chamber length change for being converted into fiber resonance cavity, so as to realize measurement of the chirped fiber grating for extraneous stress.It is specific to survey
Amount process is as follows：First, a branch of light source is provided by 980nm pump light sources, is entered after wavelength division multiplexer by chirped fiber
In the fiber resonance cavity that grating and fiber loop mirror are constituted, the erbium-doped fiber of non-linear gain is provided with fiber resonance cavity, bait light is mixed
The light that fibre is ejected constantly is exaggerated in fiber resonance cavity, when pump light source reaches certain power, by long period optical fiber
Grating is filtered, and laser is exported, it is seen that laser beat frequency signal on spectrum analyzer.When LPFG by should
Masterpiece used time, the centre wavelength of LPFG changes, and the operation wavelength of optical fiber laser changes therewith, by chirp
Fiber Bragg Grating with Delay characteristic, the chamber length of fiber resonance cavity changes, and the laser beat frequency frequency of generation changes, so that will be right
The measurement that LPFG is stressed size is converted into the measurement of laser beat frequency, passes through laser beat frequency on analysis spectrum instrument
With the relation of laser works wavelength, it is established that the corresponding relation of beat frequency rate and stress intensity, realized using chirp grating
Measurement to stress.
In the fiber resonance cavity that the utility model is made up of chirped fiber grating and fiber loop mirror, fiber resonance cavity be provided with
The LPFG of chirped fiber grating co-wavelength position, the characteristics of with narrow linewidth, antiradar reflectivity, chirped fiber grating
Big from dispersive power, delay variation is small.Chirped fiber grating have it is non-linear low, be lost it is low, encapsulate it is compact the advantages of.
Display above clearly describes general principle of the present utility model and principal character, is deviateing the utility model
On the premise of spirit and scope, the 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. a kind of utilization chirped fiber grating realizes the device of stress measurement, it is characterised in that be sequentially provided with along optical transmission direction logical
Cross optical fiber connected 980nm pump light sources, wavelength division multiplexer, Er-doped fiber, LPFG and fiber loop mirror, chirped light
Fine grating is connected by optical fiber with wavelength division multiplexer, and chirped fiber grating and fiber loop mirror constitute fiber resonance cavity, fiber loop mirror
It is connected successively with photodetector and spectrum analyzer by optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720200689.1U CN206601208U (en) | 2017-03-03 | 2017-03-03 | A kind of utilization chirped fiber grating realizes the device of stress measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720200689.1U CN206601208U (en) | 2017-03-03 | 2017-03-03 | A kind of utilization chirped fiber grating realizes the device of stress measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206601208U true CN206601208U (en) | 2017-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720200689.1U Expired - Fee Related CN206601208U (en) | 2017-03-03 | 2017-03-03 | A kind of utilization chirped fiber grating realizes the device of stress measurement |
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| CN (1) | CN206601208U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932113A (en) * | 2019-02-20 | 2019-06-25 | 天津大学 | The chirped fiber measuring system of power tactile superelevation spatial resolution |
-
2017
- 2017-03-03 CN CN201720200689.1U patent/CN206601208U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932113A (en) * | 2019-02-20 | 2019-06-25 | 天津大学 | The chirped fiber measuring system of power tactile superelevation spatial resolution |
| CN109932113B (en) * | 2019-02-20 | 2021-07-06 | 天津大学 | Chirped fiber grating measuring system with ultrahigh spatial resolution for force touch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171031 Termination date: 20180303 |