CN206709787U - A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics - Google Patents
A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics Download PDFInfo
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- CN206709787U CN206709787U CN201720475466.6U CN201720475466U CN206709787U CN 206709787 U CN206709787 U CN 206709787U CN 201720475466 U CN201720475466 U CN 201720475466U CN 206709787 U CN206709787 U CN 206709787U
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Abstract
A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics, the system is by transducing part, adjustment portion packet into the transducing part includes the first chirp grating, the second chirp grating, piezoelectric ceramics；The adjustment portion point includes the first photodetector, the second photodetector, microprocessor.The light that wideband light source is sent is divided into two by beam splitter：The first chirp grating is reached by first annular device all the way, the light of the first chirped grating reflection is exported to microprocessor through the second photodetector；Another way reaches the second chirp grating by the second circulator, and the light of the second chirped grating reflection is exported to microprocessor through the first photodetector, is demodulated.A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics of the utility model, simplifies demodulating equipment, improves the Feasible degree of experiment；The influence of ambient temperature can be eliminated, high sensitivity, durability is strong.
Description
Technical field
The utility model belongs to fiber optic sensor technology field, and in particular to a kind of double chirp gratings based on piezoelectric ceramics
Strain demodulating system.
Background technology
Chirped fiber grating sensor has the advantages that small volume, in light weight, high sensitivity receive extensive welcome, extensively
General is applied in the large-scale construction engineerings such as highway, bridge.Answered at present there has been proposed a variety of using chirped fiber grating detection
The method of change, such as：" it is a kind of based on the long chirp grating frequency domain reflection technology of optical fiber for civil structure crackle detection method and
Sensing ", this method detects local train and crackle using the long chirp frequency domain reflection technology of optical fiber.But the system detection results
It is greatly affected by temperature, can not accurately it measure.Chinese patent：" the strain of chirp grating-temperature biparameter measurement side
Method " (ZL：201110412333.1) influence of temperature can be overcome, realized to temperature and strain grade distributed measurement, but
It requires that chirped fiber grating is convex shape chirp grating, and chirped fiber grating centre L/3-2L/3 regions reflectivity is higher than two
Side, experiment condition are harsh.
And Chinese patent：A kind of " chirped fiber grating sensing demodulating system " (ZL：201010104541.0) using common
Chirped fiber grating solve the problems, such as temperature and strain cross influence well, but its intensity shape demodulating equipment is excessively multiple
It is miscellaneous.Therefore, how while demodulating equipment is simplified, the Feasible degree of experiment is improved, it is not influenceed by ambient temperature,
It is the problem of chirped fiber grating strain demodulation needs to consider.
The content of the invention
The purpose of this utility model is to provide a kind of double chirp gratings strain demodulating system based on piezoelectric ceramics, simplifies
Demodulating equipment, improve the Feasible degree of experiment；The influence of ambient temperature can be eliminated, high sensitivity, durability is strong.
The technical scheme that the utility model is taken is：
A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics, the system are grouped by transducing part, adjustment portion
Into the transducing part includes the first chirp grating, the second chirp grating, piezoelectric ceramics；The adjustment portion point includes the first light
Electric explorer, the second photodetector, microprocessor.
The light that wideband light source is sent is divided into two by beam splitter：All the way the first chirped light is reached by first annular device
Grid, the light of the first chirped grating reflection are exported to microprocessor through the second photodetector；Another way arrives by the second circulator
Up to the second chirp grating, the light of the second chirped grating reflection is exported to microprocessor through the first photodetector, is demodulated.
The first chirp grating both ends pre-stretching is fixed on the sheet glass above piezoelectric ceramics, to perceive pulling force
Change.
Second chirp grating is as reference grating, for eliminating ambient temperature effect.
The wideband light source is SOA narrow bandwidth lasers.
A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics of the utility model, advantage are：Pass through reference
The method that second chirp grating makes reference grating, cross influence of the environment temperature to strain is overcome, realize accurate measurement；Pass through
The size of two-beam pulse number and spectrum width is calculated, strain-spectrum width demodulation is realized after differential amplification, demodulation is convenient, is easy to
Regulation.
Brief description of the drawings
Fig. 1 is the first chirped grating structure schematic diagram of the present utility model.
Fig. 2 is system structure diagram of the present utility model；
Wherein：The chirp gratings of 1- first, the chirp gratings of 2- second, 3- piezoelectric ceramics, 4- wideband light sources, 5- beam splitters, 6-
First annular device, 7- single-mode fibers, the circulators of 8- second, the photodetectors of 9- first, the photodetectors of 10- second, the micro- places of 11-
Manage device, 12- sheet glass.
Embodiment
As shown in Figure 1 and Figure 2, a kind of double chirp gratings strain demodulating system based on piezoelectric ceramics, the system is by detecting means
Divide, adjustment portion is grouped into the transducing part includes the first chirp grating 1, the second chirp grating 2, piezoelectric ceramics 3；The tune
Section part includes the first photodetector 9, the second photodetector 10, microprocessor 11.
The light that wideband light source 4 is sent is divided into two by beam splitter 5：All the way the first chirp is reached by first annular device 6
Grating 1, the light of the first chirp grating 1 reflection are exported to microprocessor 11 through the second photodetector 10.
Another way reaches the second chirp grating 2 by the second circulator 8, and the light of the second chirp grating 2 reflection is through the first light
Electric explorer 9 is exported to microprocessor 11, is demodulated.
The both ends of first chirp grating 1 pre-stretching is fixed on the sheet glass 12 above piezoelectric ceramics 3, is drawn to perceive
The change of power.The pulling force of piezoelectric ceramics 3 causes wavelength change and spectrum width broadening linear.
Second chirp grating 2 is used as reference grating, for eliminating ambient temperature effect.
Influence very little of the strain-Temperature cross-over sensitivity of first chirp grating 1, the second chirp grating 2 to measurement result,
Ignore.
First chirp grating 1, the reflection wavelength difference △ λ of the second chirp grating 2 can be expressed as：
In formula, △ λ1、△λ2Change for two grating wavelengths；neffFor effective refractive index；λbFor the foveal reflex ripple of two gratings
It is long；μ is horizontal Poisson's ratio；P11And P12For elasto-optical coefficient；εzFor axial strain.Above formula represents：The variable quantity of reflection wavelength and temperature
Spend unrelated.
The strain signal and external environment that photodetector acts on piezoelectric ceramics 3 on first chirp grating 1 act on
Temperature signal on second chirp grating 2 is converted into current signal, after the Impulsive Difference amplification of broadening, utilizes microprocessor 11
Output result, eliminating temperature influences.
During the system operation, tunable SOA narrow bandwidths laser is selected as wideband light source 4, what wideband light source 4 was sent
A narrow spectrum laser pulse part is by injecting single-mode fiber 7 after first annular device 6, after reaching the first chirp grating 1, in the first Zhou
The pulse in the range of the reflectance spectrum of grating 1 of singing can be reflected, the laser direct transmission of other wavelength, and reflectance spectrum is reverse by optical fiber
After transmission, detected after the second circulator 8 by the first photodetector 9, complete to count, while show light pulse number and count
The size of spectrum width is calculated, after another part light pulse reaches the second chirp grating 2, is reflected into the second photodetector 10, is completed
Count, and show light pulse number and calculate the size of spectrum width, due to the 1 strained and dual shadow of temperature of the first chirp grating
Loud, largely broadening is understood in pulse, and the second chirp grating 2 is only influenceed by ambient temperature, and broadening amount is smaller, by two exhibitions
After wide Impulsive Difference amplification, handled using microprocessor 11, realize strain-spectrum width demodulation.The system architecture is simple, is fabricated to
This is low, high sensitivity, can easily be accommodated.
Claims (4)
- A kind of 1. double chirp gratings strain demodulating system based on piezoelectric ceramics, it is characterised in that：The system is by transducing part, tune Section part forms, and the transducing part includes the first chirp grating（1）, the second chirp grating（2）, piezoelectric ceramics（3）；The tune Section part includes the first photodetector（9）, the second photodetector（10）, microprocessor（11）；Wideband light source（4）The light sent passes through beam splitter（5）It is divided into two：Pass through first annular device all the way（6）Reach the first Zhou Sing grating（1）, the first chirp grating（1）The light of reflection is through the second photodetector（10）Export to microprocessor（11）；Another way passes through the second circulator（8）Reach the second chirp grating（2）, the second chirp grating（2）The light of reflection is through first Photodetector（9）Export to microprocessor（11）, it is demodulated.
- A kind of 2. double chirp gratings strain demodulating system based on piezoelectric ceramics according to claim 1, it is characterised in that：Institute State the first chirp grating（1）Both ends pre-stretching is fixed on piezoelectric ceramics（3）Sheet glass above（12）On, to perceive pulling force Change.
- A kind of 3. double chirp gratings strain demodulating system based on piezoelectric ceramics according to claim 1, it is characterised in that：Institute State the second chirp grating（2）As reference grating, for eliminating ambient temperature effect.
- A kind of 4. double chirp gratings strain demodulating system based on piezoelectric ceramics according to claim 1, it is characterised in that：Institute State wideband light source（4）For SOA narrow bandwidth lasers.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109000613A (en) * | 2018-08-22 | 2018-12-14 | 太原理工大学 | A kind of three-dimensional rapid detection system of goaf geology sedimentation |
| CN109443230A (en) * | 2018-12-17 | 2019-03-08 | 东莞理工学院 | A kind of piezoelectric ceramics measuring system based on image procossing |
| CN111868491A (en) * | 2017-03-21 | 2020-10-30 | 南洋理工大学 | Light sensor, sensor device and method for sensing |
-
2017
- 2017-05-02 CN CN201720475466.6U patent/CN206709787U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111868491A (en) * | 2017-03-21 | 2020-10-30 | 南洋理工大学 | Light sensor, sensor device and method for sensing |
| CN111868491B (en) * | 2017-03-21 | 2022-08-26 | 南洋理工大学 | Light sensor, sensor device and method for sensing |
| CN109000613A (en) * | 2018-08-22 | 2018-12-14 | 太原理工大学 | A kind of three-dimensional rapid detection system of goaf geology sedimentation |
| CN109443230A (en) * | 2018-12-17 | 2019-03-08 | 东莞理工学院 | A kind of piezoelectric ceramics measuring system based on image procossing |
| CN109443230B (en) * | 2018-12-17 | 2021-01-12 | 东莞理工学院 | Piezoelectric ceramic measuring system based on image processing |
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