CN206989975U - A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system - Google Patents
A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system Download PDFInfo
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- CN206989975U CN206989975U CN201720792124.7U CN201720792124U CN206989975U CN 206989975 U CN206989975 U CN 206989975U CN 201720792124 U CN201720792124 U CN 201720792124U CN 206989975 U CN206989975 U CN 206989975U
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- bragg grating
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Abstract
It the utility model is related to a kind of embedded segmentation scanning fiber bragg grating sensing demodulating system, including adjustable wavelength laser, optical fiber splitter, fiber coupler, fiber-optic grating sensor, photodetector, conditioning amplification sample circuit and embedded controller, the control port connection adjustable wavelength laser of embedded controller, the laser of adjustable wavelength laser output is after optical fiber splitter branch, each light beam is output to corresponding fiber-optic grating sensor by corresponding fiber coupler respectively, fiber coupler and photodetector as corresponding to the laser that fiber-optic grating sensor reflects passes through successively enter conditioning amplification sample circuit, then return to embedded controller.Compared with prior art, not only scan efficiency is high for the utility model, and effect is high, and system accuracy and stability are good, and system realizes that simply cost performance is high.
Description
Technical field
A kind of optical fiber grating regulating system is the utility model is related to, optical fiber light is scanned more particularly, to a kind of embedded segmentation
Grid sensing demodulating system.
Background technology
Fiber-optic grating sensor has higher reliability, Electro Magnetic Compatibility, anti-interference compared with traditional electric transducer
The feature such as ability, corrosion-resistant, has broad application prospects.
The operation principle of fiber-optic grating sensor is：With the change of the physical quantitys such as ambient temperature, stress or density, optical fiber
The wavelength of grating sensor reflection will be shifted, and fiber-optic grating sensor is reflected by optical fiber grating sensor demodulating system
The offset of wavelength be demodulated computing, it is possible to the minor variations such as temperature, stress or the density in the external world are calculated, wherein solving
The key of tune seeks to its effectively measuring wavelength shift.
With the development of tunable semiconductor laser technology in recent years, high performance wavelength adjustable laser device assembly has begun to
Applied to the optic communications such as laboratory, dense wavelength division multiplexing system and experiment fields of measurement, adjustable wavelength laser may specify specific
The output of any wavelength in power and particular range of wavelengths, and there is good digital control interface, as RS232 interface,
USART, USB etc., by these interfaces, the output wavelength of laser can be accurately controlled according to known agreement.
At present, the method for conventional fiber grating demodulation has demodulation by filter, interferometric demodulation, tunable optical source demodulation etc., pin
To each sorting technique, can be handled again using different technologies in concrete implementation.Through retrieval after a while
Found with research, in the patent applied, using the continuously adjustable semiconductor laser in designated wavelength range as core device
Part, realize that the system of fiber grating sensing demodulation is also more rare at present, core devices are different used by being realized due to system,
It is finally reflected in concrete implementation, difference is generally all very big.Although as application number 201610556709.9 introduce it is tunable
Laser is used only to realize " tunable laser output linearity scanning light source " as light source；Application number
201510411841.6 used tunable optical source device, in addition to scanning light source is provided, it is also necessary in each light source output
While, to sampling apparatus provide sampling trigger signal, the light source that this tuning source is exported be clearly intermittent pulse type and
Noncontinuity, and because system is there is light, electrical transmission delay, sampling is triggered while light source output, it is clear that exist
Problem, therefore, to solve such problem, patent 201310507078.8 introduces reference grating, " to eliminate hysteresis and drift pair
The influence of Wavelength demodulation ", application number 201510411841.6 is using synchronism output-input sample, due to system parameter
Change unbalanced the spatial distribution between different gratings, accurate synchronous in real work is difficult to accomplish, what is sampled is anti-
It can only be approximation to penetrate frequency of light wave, and application condition is big, and used tunable laser source is provided with start wavelength, terminates ripple
Upper and stepping, carries out full spectral scan within this range, and then carrying out subregion division further according to number of sensors calculates, such
Processing mode, substantial amounts of internal memory is on the one hand needed to be used for the sampled result for preserving each stepping in full spectrum, on the other hand, every
After the individual scan period terminates, re-segmenting extraction data, segmentation calculates migration result, last batch signatures result of calculation, and system is prolonged
Shi great, real-time be not high；Because network system realization is complicated, supporting paper just clearly states in [0070] section, and " host computer " is
The system of " PC controls ", because PC systems have abundant internal memory and computing resource, but the system based on PC is embedded in using
The system schema of formula economy with can not be compared with embedded system scheme in practicality, applicable scope, occasion are not yet
It is identical to the greatest extent, and level of integrated system is poor, cost performance is poor.
Utility model content
The purpose of this utility model is exactly a kind of embedded section in order to be provided the defects of overcoming above-mentioned prior art to exist
Formula scanning fiber bragg grating sensing demodulating system.
The purpose of this utility model can be achieved through the following technical solutions：
A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system, including adjustable wavelength laser, optical fiber splitter,
Fiber coupler, fiber-optic grating sensor, photodetector, conditioning-amplification-sample circuit and embedded controller, it is described
The control port connection adjustable wavelength laser of embedded controller, the laser of adjustable wavelength laser output pass through fiber optic splitter
After device branch, each light beam is output to corresponding fiber-optic grating sensor by corresponding fiber coupler respectively, is passed by fiber grating
The laser of sensor reflection pass through successively corresponding to fiber coupler and photodetector enter conditioning-amplification-sample circuit, then return
Embedded controller is returned to, wherein, described optical fiber splitter output end connects multiple branches, and one of branch is connected with one
For the reference optical fiber grating sensor of error correction, adjustable wavelength laser may be deposited using reference optical fiber grating sensor
Input and output change be modified, multiple fiber-optic grating sensors of having been connected in remaining branch, the series connection of each branch
One fiber coupler and a photodetector.
Described fiber-optic grating sensor is fiber Bragg grating sensor.
Described photodetector is one kind in PIN photoelectric detector and APD photodetectors.
The control port of described embedded controller be SPI, USART, UART, CAN, USB, RS232, RS485,
One kind in RS422, ethernet port.
Described embedded controller is one or more of groups therein of ARM, DSP, MIPS, FPGA, CPLD and x86SOC
Close.
In described system, each fiber-optic grating sensor is the mutually different fiber-optic grating sensor of initial center wavelength.
Compared with prior art, the utility model has advantages below：
(1) embedded controller is used, it is economy and practicality, level of integrated system, cost-effective.
(2) optical fiber splitter output end connects multiple branches, and one of branch is connected with a ginseng for being used for error correction
Fiber-optic grating sensor is examined, system is improved the computational accuracy of raster center wavelength.
(3) each fiber-optic grating sensor is the mutually different fiber-optic grating sensor of initial center wavelength, mutual
Reflected signal does not influence.
Brief description of the drawings
Fig. 1 is the embedded segmentation scanning fiber bragg grating sensing demodulating system structural representation of the present embodiment.
Embodiment
The utility model is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with the utility model
Implemented premised on technical scheme, give detailed embodiment and specific operating process, but guarantor of the present utility model
Shield scope is not limited to following embodiments.
Embodiment
The defects of overcoming above-mentioned prior art to exist and a kind of embedded segmentation scanning fiber bragg grating sensing and demodulating system is provided
System and method.
The purpose of this utility model can be achieved through the following technical solutions：
As shown in figure 1, a kind of embedded segmentation scanning fiber bragg grating sensing demodulating system, including adjustable wavelength laser 1,
Optical fiber splitter 2, at least one fiber coupler 3, at least one fiber-optic grating sensor 4, at least one photodetector 5,
Conditioning-amplification-sample circuit 6 and embedded controller 7.
The control instruction number that adjustable wavelength laser 1 is sent by control port reception embedded controller 7 according to agreement
According to then the light beam of output specific wavelength and power, optical fiber splitter 2 receive the laser beam that adjustable wavelength laser 1 exports, so
The laser beam is divided into multi beam afterwards to export to fiber coupler 3, the light beam of the reception optical fiber shunt 2 of fiber coupler 3 output, so
After be output to fiber-optic grating sensor 4, while by the light beam of the specific wavelength of the reflection of the fiber-optic grating sensor 4 received,
Photodetector 5 is output to, embedded controller 7 by the good information of conditioning-enhanced processing by sample circuit to adopting
Sample, then sampled signal is handled, while be controlled by output of the control port to adjustable wavelength laser 1, should
Embedded controller 7 also takes on the budget and processing of system data, and outwards exports result.
The relation determined, embedded controller 7 be present with control data in the wavelength and power output of adjustable wavelength laser 1
Adjustable wavelength laser 1 is controlled to export specific wavelength with specific power output by control port according to agreement, wherein controlling
Port processed is the one kind therein such as SPI, USART, UART, CAN, USB, RS232, RS485, RS422, Ethernet, and the wavelength can
Adjusting laser 1 can realize continuously adjustabe in designated wavelength range.
Different degrees of drift can occur for the parameter of system after the work continued by long-time of adjustable wavelength laser 1
Move, the small change between causing to input and exporting, system is by built-in fiber-optic grating sensor FBG-0 to change therein
Change and carry out periodicity monitoring, metering, its metric results is used to be modified final result.
Fiber-optic grating sensor 4 is fiber Bragg grating sensor, is each connected on phase same root optical fiber and different
Different gratings its initial center wavelength on optical fiber is different；Meanwhile each grating may specify different deviation ranges, correspond to not
Same range, also unified deviation range can be specified, but different grating initial center wavelength add according to the range ability of system
Deviation range can not have lap.
Photodetector 5 is one kind in PIN photoelectric detector and APD photodetectors.
The control port of embedded controller 7 be SPI, USART, UART, CAN, USB, RS232, RS485, RS422, with
Net very much one kind in port.
Embedded controller 7 is ARM, DSP, MIPS, FPGA, CPLD and x86SOC one or more combination therein, together
When be responsible for sampling, the processing of the output control of adjustable wavelength laser, sample-information processing, system logic, and press output format
Result.
In each branch of the output end of optical fiber splitter 2 connection, multiple fiber-optic grating sensors 4 of having connected.
In system, the initial center wavelength of each fiber-optic grating sensor 4 is different, and the value model after center wavelength shift
Enclose non-overlapping copies.
The method that the system obtains ambient parameter, including calibration phase, working stage and data processing stage,
Wherein, calibration phase is scanned using all band, and embedded controller 7 is initial according to each fiber-optic grating sensor 4
Centre wavelength, adjustable wavelength laser 1 is controlled to be sequentially output the laser of corresponding wavelength or power in full service band, to optical fiber
Grating sensor 4 is scanned and obtains reflectance spectrum, and record scans three parameters of correlation each time：Embedded controller 7
The peak power for the reflectance spectrum that the output numerical value Di of the adjustable wavelength laser 1 of setting, the sampling of embedded controller 7 obtain
Pimax and embedded controller 7 are from the control signal of output tunable laser 1 to the peak power for obtaining reflectance spectrum
Delay △ Ti between Pimax；
Working stage is scanned using segmentation, is specifically included：Each Di that embedded controller 7 records according to calibration phase, if
Corresponding Scanning Section is put, is then sampled, obtains the peak power Pimax of the reflectance spectrum of each Scanning Section and corresponding output
Numerical value Di；
Data processing stage by the peak power Pimax of the reflectance spectrum of each Scanning Section and corresponding output numerical value Di, with
The demarcation peak power Pimax of the reflectance spectrum of corresponding calibration phase and corresponding demarcation output numerical value Di are compared fortune
Calculate, obtain the center wavelength shift amount of corresponding fiber-optic grating sensor 4, so as to obtain the ambient parameter of correlation.
Claims (6)
1. a kind of embedded segmentation scanning fiber bragg grating sensing demodulating system, it is characterised in that including adjustable wavelength laser
(1), optical fiber splitter (2), fiber coupler (3), fiber-optic grating sensor (4), photodetector (5), conditioning-amplification-are adopted
Sample circuit (6) and embedded controller (7), the control port connection adjustable wavelength laser of described embedded controller (7)
(1), the laser of adjustable wavelength laser (1) output is after optical fiber splitter (2) branch, and each light beam is respectively by corresponding optical fiber
Coupler (3) is output to corresponding fiber-optic grating sensor (4), by fiber-optic grating sensor (4) reflection laser successively through pair
The fiber coupler (3) and photodetector (5) answered enter conditioning-amplification-sample circuit (6), then return to embedded control
Device (7) processed, wherein, described optical fiber splitter (2) output end connects multiple branches, and one of branch is connected with one and is used to miss
The reference optical fiber grating sensor (40) of difference amendment, multiple fiber-optic grating sensors (4) of having connected in remaining branch, each
Branch one fiber coupler (3) of series connection and a photodetector (5).
A kind of 2. embedded segmentation scanning fiber bragg grating sensing demodulating system according to claim 1, it is characterised in that institute
The fiber-optic grating sensor (4) stated is fiber Bragg grating sensor.
A kind of 3. embedded segmentation scanning fiber bragg grating sensing demodulating system according to claim 1, it is characterised in that institute
The photodetector (5) stated is one kind in PIN photoelectric detector and APD photodetectors.
A kind of 4. embedded segmentation scanning fiber bragg grating sensing demodulating system according to claim 1, it is characterised in that institute
The control port for the embedded controller (7) stated is SPI, USART, UART, CAN, USB, RS232, RS485, RS422, ether
Net one kind in port.
A kind of 5. embedded segmentation scanning fiber bragg grating sensing demodulating system according to claim 1, it is characterised in that institute
The embedded controller (7) stated is ARM, DSP, MIPS, FPGA, CPLD and x86SOC one or more combination therein.
A kind of 6. embedded segmentation scanning fiber bragg grating sensing demodulating system according to claim 1, it is characterised in that institute
In the system stated, each fiber-optic grating sensor (4) is the mutually different fiber-optic grating sensor of initial center wavelength.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720792124.7U CN206989975U (en) | 2017-07-03 | 2017-07-03 | A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system |
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| CN201720792124.7U CN206989975U (en) | 2017-07-03 | 2017-07-03 | A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107270950A (en) * | 2017-07-03 | 2017-10-20 | 上海铁路通信有限公司 | A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107270950A (en) * | 2017-07-03 | 2017-10-20 | 上海铁路通信有限公司 | A kind of embedded segmentation scanning fiber bragg grating sensing demodulating system and method |
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Granted publication date: 20180209 Termination date: 20200703 |