CN104596553B - Phase-shift pulse generation device for time division multiplexing FBG sensor network - Google Patents
Phase-shift pulse generation device for time division multiplexing FBG sensor network Download PDFInfo
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- CN104596553B CN104596553B CN201410834580.4A CN201410834580A CN104596553B CN 104596553 B CN104596553 B CN 104596553B CN 201410834580 A CN201410834580 A CN 201410834580A CN 104596553 B CN104596553 B CN 104596553B
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Abstract
The invention discloses a phase-shift pulse generation device for a time division multiplexing FBG sensor network. The device is characterized in that an FBG on the sensor network is elected through a high-precision phase-shift electric pulse signal controlling an optical signal so as to finish the time division multiplexing of large-scale optical fibers. The device comprises a configuration information analyzing unit, a pulse width information unit, a pulse width cycle information unit, a first-stage time delay control unit, a second-stage time delay control unit, a pulse control unit, a FBG position information storing control unit and an OSERDES parallel-serial conversion unit which are connected through electric signals. According to the pulse-shift pulse generation device and method, the problem that the FBG cannot be automatically scanned through a commercial signal generator can be solved; in addition, the pulse phase shift precision can be greatly improved; the cost is low; the integrity is high; the system structure is simple; the reliability is high; the time division multi-way FBG array expansion can be carried out conveniently.
Description
Technical field
The present invention relates to optical fiber grating sensing network field, more particularly, to a kind of phase shift of time division multiplex fbg sensing network
Method for generating pulse, the control of the photoswitch electric signal of achievable time division multiplex fbg detection or modulation demodulation system.
Background technology
The advantage of weak optical fiber Bragg grating sensing network is the advantages such as crosstalk is little, multiplexing capacity is strong and cost performance is high, is expected to
Quasi-distributed detection is realized in the adverse circumstances such as oil field, tunnel, building health monitoring.At present, " grating is inscribed online " technology energy
Keep at a certain distance away in fiber draw process automatic inscription grating array.This technology not only avoids traditional raster and is fused into
Contact loss during array, and the spatial distribution closeness of grating, the capacity of sensor array have the lifting of matter.So
Detection for time division multiplex fbg or sensing network system just put forward higher requirement.Time-division multiplex technology is using sensing
Interval characteristics in time domain for the reflected signal of device, can suppress the crosstalk of grating and the flexible shape monitoring each sensor effectively
State, is effective a kind of application process in time division multiplex fbg sensor-based system.In time division multiplex system, each sense light
Grid have different time delays, control the signal generator that light pulse passes in and out the high-speed optical switch of grating array to directly influence monitoring
The certainty of measurement of system and performance.Therefore, the phase-shifted pulse production method of research time division multiplex fbg sensing network is necessary.
Document " an interrogation system for a sensor array with 1310nm band
Ultra-weak fiber bragg gratings " (optical engineer, j.) proposes one kind and utilizes two soa height
The modulation and demodulation system of time division multiplex fbg sensing network realized by fast optoelectronic switch.In modulation module, a soa high-speed light
Electric switch is connected with little wideband light source, light signal is modulated and amplifies；Another soa high speed optoelectronic switchs in sampling mold
Selected through the light pulse that optical grating reflection is returned to exporting from circulator in block and separated, completed demodulation function.Phase place is prolonged
The two-way periodicity electric impulse signal of Shi Butong is controlling this two soa high speed optoelectronics switch.This time delay then corresponds to grating
Twice light path with circulator distance.Because this system uses the signal generator of commercialization, system can only be produced Non-follow control
Third contact of a total solar or lunar eclipse pulse control signal, does not possess the functions such as On-line Control raster array, automatic cycle scanning, seriously hinders system
Commercialization process.In addition, Commercial signal generators can only produce the pulse delay of nanosecond, precision also can not meet it is
The growing performance requirement of system.
Content of the invention
The technical problem to be solved in the present invention is: in existing time division multiplex time division multiplex fbg sensing network system
Cannot on-line automatic produce target light pulse control signal problem, a kind of phase shift arteries and veins of time division multiplex fbg sensing network is provided
Rush generation device, this device can achieve time division multiplex fbg sensor automatic location, storage, and the pulsewidth of pulse, cycle etc.
The picosecond phase delay pulse that parameter can be joined completely online again.
The technical solution adopted for the present invention to solve the technical problems is:
The phase-shifted pulse generation device of the time division multiplex fbg sensing network that the present invention provides, its structure is: high-precision phase position
Mobile electric impulse signal controls optical signal to select the fbg on sensing network, completes large-scale optical fiber grating time division multiplex, including with
The connected configuration information resolution unit of electric signal, pulse width information unit, pulse width period information unit, first order timing_delay estimation list
Unit, second level time delay control unit, pulse control unit, raster position information storage control unit, oserdes parallel-serial conversion list
Unit.
Described configuration information resolution unit, for upper machine communication and obtain pulse configuration information, this unit resolves
The pulsewidth finishing is stored by pulse width information unit, and this unit is by including usb, network interface, serial ports control logic and ascii code is privately owned joins
Put agreement composition, by fpga logic realization.
Described pulse width information unit is used for storing target pulse width information, is made up of the distributed ram of fpga.
Described pulse control unit is used for controlling and manages bram, is made up of fpga logic.
Described pulse width period information unit is made up of the internal distributed ram of fpga, is configured information analysis for storage
The pulse period that unit resolves finish.
Described first order Delay unit, when being configured, for storage, the first order that information analysis unit resolves finish
Prolong, this first order Delay unit is made up of the internal distributed ram of fpga；Described second level Delay unit is odelay
Second level Delay unit, for storage be configured the second level time delay that information analysis unit resolves finish, this unit by
Inside fpga, formula ram forms respectively.
Described oserdes parallel serial conversion unit is made up of the internal io special parallel-to-serial converter oserdes primitive of fpga, and one
Individual oserdes primitive can complete the serioparallel exchange of a 4:1.
Described raster position information storage control unit, for producing pulse signal, this unit is by Pulse Width Control logic
With fpga internal bram array composition.
The phase-shifted pulse generation device of the above-mentioned time division multiplex fbg sensing network that the present invention provides, it is realizing the time-division again
With the application in the control of fbg detection or the photoswitch electric signal of modulation demodulation system.
The light of the detection of time division multiplex fbg or modulation demodulation system during apparatus of the present invention application, is realized using following steps
The control of switched electrical signal:
(1) host computer pass through usb or network interface or serial ports configure pulse width information, pulse width period information, first order time delay,
Second level time delay；
(2) set according to step (1), produce two-way delay pulse signal, control the switch time of two-way soa；This
Delay time corresponds to once coming and going of diverse location fbg on sensing network for the light and reflects optical path difference, thus each is single
The reflected signal of fbg is sent to ccd demodulation, and the same order reflected signal of other fbg will be filtered.
The present invention compared with prior art has the advantages that following main:
1. high-precision delay period pulse can be produced, control soa high-speed optical switch to separate and amplify time division multiplex fbg battle array
The reflected signal of the single grating in row, is accurately positioned the exact space position that single grating is with respect to circulator simultaneously.
2. can the automatically scanning of stop position, storage online；Flexibly obtain the state of arbitrarily single grating；For not sharing the same light
Grid array Configuration Online different scan period and pulsewidth.
3. the single grating of manual flexible operating, enters the on-line checking of line raster, including the reflectivity detecting single grating, inspection
Look into grating laying quality, the various faults on analysis grating array or stranding grating, and the position of positioning failure.
4., through simple copy it is possible to produce multiple delay pulse pair, may be directly applied to extensive space division multiplexing
System, solid foundation has been established in the time division multiplex fbg sensing network system industrialization for realizing extensive or ultra-large.
5. it is the monitoring of extensive grating array online scribing process parameter, or the inspection of field construction quality, with timely
Multiplexing fbg sensor-based system industrialization is divided to take a step of key.
In a word, the present invention solves the Commercial signal generators of time division multiplex fbg sensing network and is unable to automatically scanning optical fiber
The problem of grating array, and substantially increase pulse Phase shift precision, low cost, integrated level is high, and system architecture is simple, reliability
Good, can conveniently carry out space division multiplexing grating array extension.
Brief description
Fig. 1 is the phase delay pulses generation of the time division multiplex grating sensing network based on xilinx fpga of the present invention
The structured flowchart of method.
Fig. 2 is the initialization grating array automatically scanning pattern diagram of phase delay method for generating pulse of the present invention.
Fig. 3 is the normal mode of operation schematic diagram of phase delay method for generating pulse of the present invention.
Fig. 4 is the single grating debugging/status poll pattern diagram of phase delay method for generating pulse of the present invention.
Fig. 5 is the functional structure chart of the preferable case study on implementation of the present invention.
Fig. 6 is the application system block diagram of the present invention.
Specific embodiment
The invention discloses a kind of phase-shifted pulse generation device of time division multiplex fbg sensing network, this device adopts two-stage
Time delay control unit, can produce the multichannel cycle, pulsewidth can Runtime reconfiguration high accuracy delay pulse control light-path signal.The
One-level time delay control unit is completed by impulse waveform is mapped in bram, reads the data in bram, serioparallel exchange to i/o
Interface；The precision of this grade was up to for 0.625 nanosecond；The precision of second level time delay control unit is single step length 78 psec/52 skin
Second, totally 32 ranks are adjustable, and regulation overall delay was 2.496 nanosecond/1.664 nanoseconds.
With reference to embodiments and accompanying drawing, the present invention is described in further detail.It should be appreciated that tool described herein
Body embodiment, only in order to explain the present invention, does not limit the present invention.
The phase-shifted pulse generation device of the time division multiplex fbg sensing network that the present embodiment provides, is a kind of based on xilinx
The virtex6 series of fpga and 7 series and be designed as that high-precision time-delay is adjustable, high-speed light that pulse period and pulsewidth can be joined again is opened
Close the device controlling, this device is not only suitable for the detection of single grating, is also applied for thering is large-scale time division multiplex fbg battle array
Row, its structure as shown in figure 1, include host computer, and with electric signal be connected configuration information resolution unit, pulse width information list
Unit, pulse period information unit, first order time delay control unit, second level time delay control unit, pulse control unit, grating position
Confidence breath storage control unit, oserdes, wherein: when configuration information resolution unit is the pulsewidth of host computer, cycle, the first order
Prolong and be separately sent to corresponding pulse control unit, pulse period control unit, first order time delay control with second level Delay
Unit processed, second level time delay control unit.The locus Delay of single grating is parsed it by configuration information resolution unit
After be sent to raster position information storage control unit.Host computer passes through the common interfaces such as usb, network interface, serial ports and has been adopted private
The configuration data bag having protocol definition is sent to signal generator.
Described configuration information resolution unit, for upper machine communication and obtain pulse configuration information, this unit resolves is complete
Complete pulsewidth is stored by pulse width information unit, and this unit is private by the common interfaces control logic such as usb, network interface, serial ports and ascii code
It is made up of configuration protocol, by fpga logic realization.
Described pulse width information unit is made up of the distributed ram of fpga, for storing target pulse width information.
Described pulse control unit is used for controlling and manages bram, is made up of fpga logic, completes the Read-write Catrol of bram,
Realize the waveform on the burst length to be mapped in bram memory space.
It was 1 nanosecond that described pulse control unit produces first order time delay precision, and that is, i/o port speed is 1ghz.By two
Oserdes (the special parallel serial conversion unit of fpga io) forms the data conversion of 8:1.Data width in bram is 8 bits, right
The work clock answered is 125mhz.If the setting pulse period is 10 microseconds, the depth of corresponding bram is exactly 10 × 103/8
=1250；If setting pulsewidth was 20 nanoseconds, 1# pulse control unit writes continuous 20 " 1 " and arrives bram, address 0 and address
1 write data 8 ' bff, address 2 writes data 8 ' bf0.As long as bram address 0～1249 is read in the circulation of 1# pulse control unit,
In data, and be sent to oserdes unit and carry out the data flow that serioparallel exchange becomes 1ghz, just create 1# pulse.Similar
Step produce 2# pulse.Because 2# pulse needs to produce relative time delay, this Delay is anti-by the data in bram
Mirror.Such as, if 2# pulsion phase needs time delay 1 nanosecond to 1# pulse, then need to write in the bram array of 2# pulse
Enter following data, address 0 writes data 8 ' b7f, address 1 writes data 8 ' bff, address 2 writes data 8 ' bf8.Synchronous 1# arteries and veins
Rush the reading address of control unit and 2# pulse control unit, the time delay pulse of 1 nanosecond is to just creating.
Described pulse period information unit, is configured, for storage, the pulse period that information analysis unit resolves finish, should
Pulse period information unit is made up of the internal distributed ram of fpga.
Described first order Delay unit, when being configured, for storage, the first order that information analysis unit resolves finish
Prolong, this first order Delay unit is made up of the internal distributed ram of fpga.
Described second level Delay unit is odelay second level Delay unit, is configured information solution for storage
The analysis second level time delay that finishes of unit resolves, this second level Delay unit by inside fpga respectively formula ram form.Due to
One-level time delay precision was 1 nanosecond, therefore this second level time delay elements only needs to configure the time delay of 0～12 bat.
Described odelay second level Delay unit, for the second level finely tune timing_delay estimation pulse signal, this unit by
Odelay control logic and fpga internal odelay primitive composition.The time delay umber of beats controlling odelay primitive is it is possible to when carrying out
The fine setting prolonged.According to up-to-date xilinx fgpa 7 family device characteristic, this grade of time delay step-length is 78 psec/52 psecs, totally 32 rank
Adjustable, regulation overall delay was 2.496 nanosecond/1.664 nanoseconds.With the lifting of fgpa device io interface rate, this grade of time delay essence
Degree can further improve.
Described oserdes parallel serial conversion unit, is fpga internal io special parallel-to-serial converter oserdes primitive composition.One
Individual oserdes primitive can complete the serioparallel exchange of a 4:1.
Described raster position information storage control unit, for producing pulse signal, this unit is by Pulse Width Control logical sum
Fpga internal bram array composition.When, under a certain time delay, when ccd wavelength peak detects maximum, host computer is just correspondence
Grating numbering and Delay write configuration information resolution unit.Raster position information storage control unit receive signal it
Afterwards, it is respectively written into bram and the data field of outside flash.1# pulse control unit and 2# pulse control unit are according to different operating
Pattern reads corresponding grating delay data respectively, is written in respective bram array.
Described host computer adopts general purpose personal computer or work station, installs the test such as serial ports/usb/ Networked E-Journals instrument
Software, transmits command information.
The phase-shifted pulse generation device of the time division multiplex fbg sensing network that the present embodiment provides, is provided with electric signal outside it
The flash nonvolatile storage connecting is used for power on configuration fpga program, and power down preserves the information of single fiber grating, bag
Include locus, reflectivity etc..
The phase-shifted pulse generation device of the time division multiplex fbg sensing network that the present embodiment provides, its course of work is by following
Three kinds of typical mode of operations are realized:
Initialization grating array automatically scanning pattern (Fig. 2): the entrance initialization grating array receiving host computer is automatic
After scan pattern instruction, phase delay pulsed operation is in specified mode of operation.Pulse period and width parameter are at any time
The machine of being generalized resets, without configuration, then using default parameters, pulse period 100khz and pulsewidth 20 nanosecond.According to
First order time delay precision 1 nanosecond, the time delay of 1 nanosecond is moved in 2# pulse；Bragg wavelength reflection according to ccd, if there is wavelength
Peak value corresponding time delay numerical value, if not wavelength peak, then increases time delay step-length 1 nanosecond, continues to determine whether exist
Local peaking's wavelength；If wavelength peak, then enter second level peak wavelength time delay value fine setting.Principle is similar to first order time delay
Adjust, the umber of beats of configuration second level time delay, recurrence finds peak wavelength corresponding precise delay numerical value.This time delay numerical value passes through
Raster position information storage control unit write bram array and outside flash data area.If 1# and 2# time delay value is more than one
Then whole grating of individual cycle is scanned, releases initialization grating array automatically scanning pattern.
Normal mode of operation (Fig. 3): after receiving host computer entrance normal work instruction, phase delay impulse generator work
Make in specified mode of operation.Pulse control unit sequentially reads single grating from raster position information storage control unit
Positional information, according to the numerical value reading, configures two-way time delay pulse.Calculate peak wavelength from the sampled value of ccd, complete it
Afterwards, grating label adds 1, enters next Grating examinations.If because systematic error leads to peak wavelength once not calculate,
The delay pulse of current raster can be retransmited, continue to calculate the peak wavelength of this grating.
Single grating debugging/status poll pattern (Fig. 4): receive host computer and enter single grating debugging/status poll
After mode instruction, phase delay arteries and veins generator is operated in the mode of operation specified.This modal phase delay pulse generator is
From pattern, according to the time delay numerical value of host computer configuration, sends the corresponding pulse of two-way.Host computer can be single with manual test/debugging
Individual grating sensor.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
Such as change fpga device, and all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (10)
1. a kind of phase-shifted pulse generation device of time division multiplex fbg sensing network, is characterized in that high-precision phase position moves electric pulse
Signal controls optical signal to select the fbg on sensing network, completes large-scale optical fiber grating time division multiplex, its structure includes upper
Machine, and during with the connected configuration information resolution unit of electric signal, pulse width information unit, pulse width period information unit, the first order
Prolong control unit, second level time delay control unit, pulse control unit, raster position information storage control unit, oserdes simultaneously
String converting unit, wherein: configuration information resolution unit is the pulsewidth of host computer, cycle, first order time delay and second level time delay letter
Breath is separately sent to corresponding pulse control unit, pulse period information unit, first order time delay control unit, second level time delay
Control unit；Configuration information resolution unit is sent to stop position letter by after the locus Delay parsing of single grating
Breath storage control unit.
2. the phase-shifted pulse generation device of time division multiplex fbg sensing network according to claim 1, is characterized in that described
Configuration information resolution unit, for upper machine communication and obtain pulse configuration information, the pulsewidth that this unit resolves finishes is by arteries and veins
Wide information unit storage, this unit is formed by including usb, network interface, serial ports control logic and the privately owned configuration protocol of ascii code, by
Fpga logic realization.
3. the phase-shifted pulse generation device of time division multiplex fbg sensing network according to claim 1, is characterized in that described
Pulse width information unit is used for storing target pulse width information, is made up of the distributed ram of fpga.
4. the phase-shifted pulse generation device of time division multiplex fbg sensing network according to claim 1, is characterized in that described
Pulse control unit is used for controlling and manage the internal bram of fpga, is made up of fpga logic.
5. the phase-shifted pulse generation device of time division multiplex fbg sensing network according to claim 1, is characterized in that described
Pulse width period information unit is made up of the internal distributed ram of fpga, is configured what information analysis unit resolves finished for storage
Pulse period.
6. the phase-shifted pulse generation device of time division multiplex fbg sensing network according to claim 1, is characterized in that described
One-level Delay unit, is configured, for storage, the first order time delay that information analysis unit resolves finish, this first order time delay
Information unit is made up of the internal distributed ram of fpga；Described second level Delay unit is odelay second level Delay
Unit, is configured, for storage, the second level time delay that information analysis unit resolves finish, and this unit is by the internal distributed ram of fpga
Composition.
7. the phase-shifted pulse generation device of time division multiplex fbg sensing network according to claim 1, is characterized in that described
Oserdes parallel serial conversion unit is made up of the internal io special parallel-to-serial converter oserdes primitive of fpga, an oserdes primitive
The serioparallel exchange of a 4:1 can be completed.
8. the phase-shifted pulse generation device of time division multiplex fbg sensing network according to claim 1, is characterized in that described
Raster position information storage control unit, for producing pulse signal, this unit is by the internal bram of Pulse Width Control logical sum fpga
Array forms.
9. the phase-shifted pulse generation device of time division multiplex fbg sensing network described in any claim in claim 1 to 8 should
With it is characterized in that the application in realizing the control of photoswitch electric signal of the detection of time division multiplex fbg or modulation demodulation system.
10. application according to claim 9, when it is characterized in that application, realizes the detection of time division multiplex fbg using following steps
Or the control of the photoswitch electric signal of modulation demodulation system:
(1) host computer pass through usb or network interface or serial ports configure pulse width information, pulse width period information, first order time delay, second
Level time delay；
(2) set according to step (1), produce two-way delay pulse signal, control the switch time of two-way soa；This two-way soa
Switch time difference diverse location fbg on sensing network corresponding to light once come and go reflection optical path difference, thus each is single
The reflected signal of only fbg is sent to ccd demodulation, and the same order reflected signal of other fbg will be filtered.
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| CN104980130B (en) * | 2015-07-15 | 2018-05-15 | 福建利利普光电科技有限公司 | The method of the change Rise Time of Square Wave of OSERDES2 based on FPGA |
| CN107291646B (en) * | 2016-04-11 | 2021-04-16 | 中兴通讯股份有限公司 | Network port and serial port multiplexing device and single board |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7406218B2 (en) * | 2006-06-09 | 2008-07-29 | Anritsu Corporation | FBG sensor system |
| CN101476900B (en) * | 2009-01-19 | 2011-01-26 | 冷劲松 | Time division multiplexing optical fiber sensing apparatus |
| CN102183267B (en) * | 2011-03-11 | 2015-08-19 | 江苏联通电缆有限公司 | A kind of fiber Bragg grating sensor |
| JP5308502B2 (en) * | 2011-12-21 | 2013-10-09 | アンリツ株式会社 | FBG sensor system |
| CN102840875B (en) * | 2012-09-10 | 2014-10-22 | 中国科学院半导体研究所 | Sensor multiplexing system based on phase-shifted fibre Bragg grating |
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