CN108226819A - A kind of ground magnetic field monitoring system and method based on fiber grating - Google Patents
A kind of ground magnetic field monitoring system and method based on fiber grating Download PDFInfo
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- CN108226819A CN108226819A CN201611149931.3A CN201611149931A CN108226819A CN 108226819 A CN108226819 A CN 108226819A CN 201611149931 A CN201611149931 A CN 201611149931A CN 108226819 A CN108226819 A CN 108226819A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/032—Measuring direction or magnitude of magnetic fields or magnetic flux using magneto-optic devices, e.g. Faraday or Cotton-Mouton effect
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Abstract
The embodiment provides a kind of ground magnetic fields based on fiber grating to monitor system and method, and system includes sequentially connected pulsed light generating unit, optical fiber grating sensing unit and optical signal processing unit；Pulsed light generating unit is used to generate pulsed light, and the pulsed light is transmitted to optical fiber grating sensing unit；Optical fiber grating sensing unit is embedded under the surface layer of ground, and reflects multiple optical signals in different location for the pulsed light according to reception, and multiple optical signals are transmitted to optical signal processing unit；Optical signal processing unit for the optical signal of reception to be converted into electric signal, and is monitored ground magnetic field according to electric signal.The present invention improves the accuracy and reliability for monitoring and judging to ground magnetic field, effectively reduces ground magnetic field vibrations wrong report, realizes the advanced warning to ground changes of magnetic field.
Description
Technical field
The present invention relates to ground magnetic field monitoring technical fields, and in particular to a kind of ground magnetic field monitoring based on fiber grating
System and method.
Background technology
Optical fiber cable is since the characteristic that its light conducts is widely used in all trades and professions, in addition to applied to communication, also
Perceptually equipment carries out the perception of external physical quantity variation, such as temperature, stress, vibration and variation of stress etc.；And in city
In city, optical fiber cable is reserved as the sensing equipment of detection earth shock again, i.e., obtains ground by the variation of ground magnetic field
Shock conditions, so as to being alerted in advance to behaviors such as pipeline damages.
It is to collect shaking for ground by optical fiber to vibrate main technical approach by optical fiber sensing technology perceiving ground at present
Move signal and by vibration signal so as to judge the vibration source on ground.But the vibration that such mode can not perceive vibration source is strong
The actual size of degree exists and vibrates larger source in larger distance and vibrate optical fiber sense of the smaller source in nearer distance
Intensity vibrated is similar, and then causes to report by mistake.
Invention content
For the defects in the prior art, the present invention provides a kind of ground magnetic field monitoring system based on fiber grating and side
Method by the oscillation intensity of the vibration source on the vibration signal accurate judgement ground of different location, and then is improved to ground magnetic field
Monitoring and the accuracy and reliability judged effectively reduce ground magnetic field vibrations wrong report, realize to ground changes of magnetic field
Advanced warning.
In order to solve the above technical problems, the present invention provides following technical scheme：
On the one hand, the present invention provides a kind of ground magnetic fields based on fiber grating to monitor system, the system comprises：According to
Pulsed light generating unit, optical fiber grating sensing unit and the optical signal processing unit of secondary connection；
The pulsed light for generating pulsed light, and is transmitted to the optical fiber grating sensing by the pulsed light generating unit
Unit；
The optical fiber grating sensing unit is embedded under the surface layer of ground, and is used for the pulsed light according to reception in different location
Multiple optical signals are reflected, and the multiple optical signal is transmitted to the optical signal processing unit；
The optical signal processing unit, for the optical signal of reception to be converted into electric signal, and according to the electric signal pair
Ground magnetic field is monitored.
Further, the optical fiber grating sensing unit includes：The sensor fibre that is embedded under the surface layer of ground and set up separately
Multiple fiber-optic grating sensors in the sensing scope of the sensor fibre, and each fiber-optic grating sensor and the pulsed light
Distance between generating unit differs；
The sensor fibre, for receiving the pulsed light of the pulsed light generating unit transmission；
The fiber-optic grating sensor, for when the sensor fibre receives pulsed light, reflected light signal, and it is each described
Fiber-optic grating sensor is respectively by optical signal transmission to the optical signal processing unit.
Further, one end far from the pulsed light generating unit is equipped with specular-reflection unit on the sensor fibre；
The specular-reflection unit, for the sensor fibre in the pulsed light for receiving the pulsed light generating unit transmission
Afterwards, the pulsed light is subjected to mirror-reflection, obtains reflected light signal, and the reflected light signal is sent to the optical signal
Processing unit.
Further, the optical signal processing unit includes：Sequentially connected fiber-optical probe, data acquisition card and signal
Processor；
The fiber-optical probe for receiving the optical signal of the optical fiber grating sensing unit reflection, and the light is believed
It number is converted into electric signal and the electric signal is sent to data acquisition card；
The data acquisition card, for the electric signal received to be sent to the signal processor；
The signal processor, for being monitored and determining to draw to ground magnetic field according to the electric signal of reception
Play the scene of current magnetic field variation.
Further, the pulsed light generating unit includes：The wide line wideband laser and fiber amplifier of interconnection；
The wide line wideband laser, is washed off for generating long pulse, and by the long pulse optical transport to the fiber amplifier
Device；
The fiber amplifier washes carry out optical signal amplification off for the long pulse to reception, and by amplified pulsed light
It is transmitted to the optical fiber grating sensing unit.
Further, the system also includes：
Circulator, the pulsed light for the pulsed light generating unit to be sent out are transmitted to the optical fiber grating sensing list
Member and by the optical signal transmission of optical fiber grating sensing unit reflection to the optical signal processing unit.
On the other hand, the present invention also provides a kind of ground magnetic field monitoring method based on fiber grating, the method packets
It includes：
Pulsed light is generated in magnetic field of the goal monitoring range, and the pulsed light is transmitted to the biography being embedded under the surface layer of ground
Photosensitive fibre；
When sensor fibre receives optical signal, multiple optical signals are acquired respectively at different locations；
Multiple optical signals of acquisition are converted into electric signal；
And the ground magnetic field in the monitoring range of current goal magnetic field is monitored according to multiple electric signals.
Further, it is described pulsed light to be generated in magnetic field of the goal monitoring range, and the pulsed light is transmitted to and is embedded in
Sensor fibre under the surface layer of ground, including：
Pulsed light is generated in magnetic field of the goal monitoring range；
Optical signal amplification is carried out, and amplified pulsed light is transmitted to and is embedded under the surface layer of ground to the pulsed light
Sensor fibre.
Further, it is described that the ground magnetic field in the monitoring range of current goal magnetic field is carried out according to multiple electric signals
Monitoring, further includes before：
Mirror-reflection is carried out, and the reflected light signal is converted into electricity to the optical signal being transmitted in the sensor fibre
Signal.
Further, it is described that the ground magnetic field in the monitoring range of current goal magnetic field is carried out according to multiple electric signals
Monitoring, including：
According to the corresponding each electric signal of different time points, determine that magnetic field intensity becomes in the monitoring range of current goal magnetic field
Change；
If through judging to know that presently described change of magnetic field strength is more than preset strength threshold value, the change of magnetic field strength is obtained
Change frequency value；
And the field that current magnetic field is caused to change is determined in preset frequency scene table according to the change frequency value
Scape；
Wherein, the frequency scene table is for storage change frequency values and the correspondence of each scene.
As shown from the above technical solution, a kind of ground magnetic field monitoring system and side based on fiber grating of the present invention
Method, system pass through sequentially connected pulsed light generating unit, optical fiber grating sensing unit and optical signal processing unit；Pulsed light is sent out
Raw unit is used to generate pulsed light, and the pulsed light is transmitted to optical fiber grating sensing unit；Optical fiber grating sensing unit is buried
Multiple optical signals are reflected in different location, and multiple optical signals are equal under the surface layer of ground, and for the pulsed light according to reception
It is transmitted to optical signal processing unit；Optical signal processing unit, for the optical signal of reception to be converted into electric signal, and according to telecommunications
Number ground magnetic field is monitored, improves the accuracy and reliability for monitoring and judging to ground magnetic field, effectively reduce ground
Face magnetic-field vibration wrong report, realizes the advanced warning to ground changes of magnetic field；And the system structure is simple, at low cost, precision is high,
Mounting, commissioning and maintenance is more convenient, can be reliably and with long-term for working in adverse circumstances, there are the advantages such as corrosion-resistant, anti-interference,
Have a very wide range of applications scene.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is the present invention
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 is a kind of a kind of specific reality of ground magnetic field monitoring system based on fiber grating in the embodiment of the present invention one
Apply the structure diagram of mode；
Fig. 2 is the structure diagram of the pulsed light generating unit 10 in the embodiment of the present invention two；
Fig. 3 is the structure diagram of the optical fiber grating sensing unit 20 in the embodiment of the present invention three；
Fig. 4 is the structure diagram of the sensor fibre 21 in ground magnetic field monitoring system in the present invention；
Fig. 5 is the structure diagram of the optical signal processing unit 30 in the embodiment of the present invention four；
Fig. 6 is that a kind of another kind of ground magnetic field monitoring system based on fiber grating in the embodiment of the present invention five is specific
The structure diagram of embodiment；
Fig. 7 is a kind of structural representation of ground magnetic field monitoring system based on fiber grating in concrete application example of the present invention
Figure；
Fig. 8 is a kind of a kind of specific reality of ground magnetic field monitoring method based on fiber grating in the embodiment of the present invention six
Apply the flow diagram of mode；
Fig. 9 is a kind of flow of specific embodiment of step 100 in the above-mentioned monitoring method in the embodiment of the present invention seven
Schematic diagram；
Figure 10 is a kind of stream of the specific embodiment for the above-mentioned monitoring method that the embodiment of the present invention eight includes step A00
Journey schematic diagram；
Figure 11 is a kind of flow of specific embodiment of step 400 in the above-mentioned monitoring method in the embodiment of the present invention nine
Schematic diagram；
Figure 12 is a kind of structural representation of ground magnetic field monitoring device based on fiber grating in the embodiment of the present invention ten
Figure.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with the embodiment of the present invention
In attached drawing, clear, complete description is carried out to the technical solution in the embodiment of the present invention, it is clear that described embodiment is
Part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiments obtained without creative efforts shall fall within the protection scope of the present invention.
The embodiment of the present invention one provides a kind of ground magnetic field monitoring system based on fiber grating.Referring to Fig. 1, the monitoring
System specifically includes following content：
Sequentially connected pulsed light generating unit 10, optical fiber grating sensing unit 20 and optical signal processing unit 30.
The pulsed light for generating pulsed light, and is transmitted to the fiber grating and passed by the pulsed light generating unit 10
Feel unit 20.
In this unit, pulsed light generating unit 10 is connect with optical fiber grating sensing unit 20, and pulsed light generating unit
10 periodically generate long pulse according to preset frequency values washes off, and pulsed light is transmitted to optical fiber light through the light transmission tubes line such as optical cable
Grid sensing unit 20.
The optical fiber grating sensing unit 20 is arranged on ground surface layer, and is used for the pulsed light according to reception in different positions
The multiple optical signals of reflection are put, and the multiple optical signal is transmitted to the optical signal processing unit 30.
In this unit, optical fiber grating sensing unit 20 is arranged on ground surface layer, can be embedded in close to the ground of earth's surface
It under face, can also be arranged at close proximity to ground, and receive the pulsed light that pulsed light generating unit 10 is sent, and anti-according to pulsed light
Multiple optical signals are penetrated, and the multiple optical signal is transmitted to the optical signal processing unit 30, wherein, due to the position of reflection
Difference is put, i.e. the distance between each position and pulsed light generating unit 10 is also different, therefore the time point of the optical signal reflected
It is different, that is to say, that the position nearer from pulsed light generating unit 10, the time used in reflected light signal is shorter, from pulsed light
The more remote position of generating unit 10, the time used in reflected light signal are longer.
The optical signal processing unit 30, for the optical signal of reception to be converted into electric signal, and according to the electric signal
Ground magnetic field is monitored.
In this unit, the optical signal of reception is converted into electric signal, and the electricity that conversion obtains by optical signal processing unit 30
Number of signals is identical with the optical signal quantity received and ground magnetic field is monitored, and judges according to the electric signal
Cause the operative scenario of changes of magnetic field.
As can be seen from the above description, the embodiment of the present invention is passed by sequentially connected pulsed light generating unit, fiber grating
Feel unit and optical signal processing unit, realize the vibration signal for the different location that ground is collected by optical fiber, pass through different positions
The vibration signal put judges the oscillation intensity of the vibration source on ground, and then improves the accuracy for monitoring and judging to ground magnetic field
And reliability, realize the advanced warning to ground changes of magnetic field.
The embodiment of the present invention two provides a kind of specific embodiment of pulsed light generating unit 10 in above-mentioned monitoring system.
Referring to Fig. 2, which specifically includes following content：
The wide line wideband laser 11 and fiber amplifier 12 of interconnection.
The wide line wideband laser 11, is washed off for generating long pulse, and the long pulse optical transport to the optical fiber is put
Big device 12.
The fiber amplifier 12 washes carry out optical signal amplification off for the long pulse to reception, and by amplified pulse
Optical transport is to the optical fiber grating sensing unit 20.
As can be seen from the above description, the embodiment of the present invention can periodically generate pulsed light so that optical fiber grating sensing
Unit 20 can obtain pulsed light in real time, ensure that the promptness for obtaining ground magnetic field variation.
The embodiment of the present invention three provides a kind of specific embodiment party of optical fiber grating sensing unit 20 in above-mentioned monitoring system
Formula.Referring to Fig. 3, which specifically includes following content：
The sensor fibre 21 that is embedded under the surface layer of ground and set up separately more in the sensing scope of the sensor fibre 21
A fiber-optic grating sensor 22, and the not phase of the distance between each fiber-optic grating sensor 22 and the pulsed light generating unit 10
Together.
The sensor fibre 21, for receiving the pulsed light that the pulsed light generating unit 10 transmits, in practical applications,
Sensor fibre 21 can be embedded in designated position in monitoring range region according to actual conditions, can also directly utilize pre-plugged
In the sensor fibre 21 of subsurface.
The fiber-optic grating sensor 22, for when the sensor fibre 21 receives pulsed light, reflected light signal, and it is each
The fiber-optic grating sensor 22 is respectively by optical signal transmission to the optical signal processing unit 10.
As can be seen from the above description, the embodiment of the present invention gives one kind can reflect different time points at different locations
Optical signal, enable to optical signal processing unit according to the optical signal of the different time points accurately obtain ground magnetic field variation and
Vibration source, using Fbg Sensor For Measuring Magnetic Field, not traditional vibrating sensing.The principle of system operation is logical
Detection optical fiber changes of magnetic field nearby is crossed, realizes the accurate investigation destroyed to construction around optical fiber with artificial instrument and early warning.So as to
Realize that the early warning that pipe network is completed from another angle is safeguarded.
In a kind of specific embodiment, the present invention provides a kind of specific embodiments of above-mentioned sensor fibre 21.Ginseng
See Fig. 4, which specifically includes following content：
One end far from the pulsed light generating unit 10 is equipped with specular-reflection unit 211 on the sensor fibre 21.
The specular-reflection unit 211 transmits for the sensor fibre 21 in the reception pulsed light generating unit 10
Pulsed light after, by the pulsed light carry out mirror-reflection, obtain reflected light signal, and the reflected light signal is sent to institute
State optical signal processing unit 30.
As can be seen from the above description, specific embodiment of the invention gives another equipment for being capable of reflecting light signal,
Optical signal processing unit is enabled to accurately to investigate distracter according to the reflected light signal and infer and learns applying near optical fiber
Work situation.
The embodiment of the present invention four provides a kind of specific embodiment of optical signal processing unit 30 in above-mentioned monitoring system.
Referring to Fig. 5, which specifically includes following content：
Sequentially connected fiber-optical probe 31, data acquisition card 32 and signal processor 33；
The fiber-optical probe 31, for receiving the optical signal that the optical fiber grating sensing unit 20 reflects, and by described in
Optical signal is converted into electric signal and the electric signal is sent to data acquisition card 32.
The data acquisition card 32, for the electric signal received to be sent to the signal processor 33.
The signal processor 33, for being monitored and being determined to ground magnetic field according to the electric signal of reception
The scene that current magnetic field is caused to change.
As can be seen from the above description, the embodiment of the present invention can be believed according to the optical signal and reflected light of the different time points
Number, it is accurate to investigate distracter and infer the condition of construction learnt near optical fiber, obtain ground magnetic field variation and vibration source.
The embodiment of the present invention five provides another specific embodiment of above-mentioned monitoring system.Referring to Fig. 6, the monitoring system
System further includes following content：
For carrying out light between pulsed light generating unit 10, optical fiber grating sensing unit 20 and optical signal processing unit 30
The circulator 40 of signal transmission.
Circulator 40 is used to the pulsed light that the pulsed light generating unit is sent out being transmitted to the optical fiber grating sensing list
Member and by the optical signal transmission of optical fiber grating sensing unit reflection to the optical signal processing unit.
As can be seen from the above description, the embodiment of the present invention gives a kind of pulsed light generating unit, optical fiber grating sensing list
The transmission device of optical signal transmission is carried out between member and optical signal processing unit, and the characteristics of the equipment is because of its one-way transmission, is made
Accuracy must be transmitted and reliability is high.
For further description this programme, the present invention also provides a kind of ground magnetic fields based on fiber grating to monitor system
The concrete application example of system.Referring to Fig. 7, it is as follows which specifically includes content：
The wide laser 11 of the wide line, fiber amplifier 12, circulator 40, fiber-optic grating sensor 22, fiber-optical probe 31, letter
Number capture card 32 and signal processor 33 form.
Wherein analysis software is mounted on signal processor 33, by the analysis for reflected light signal s, so as to judge magnetic
The position of field B variations.
The long pulse that the wide laser 11 of the wide line occurs, which is washed off, is amplified into No. 1 of circulator 40 by fiber amplifier 12
Mouthful, and enter sensor fibre 21 by No. 2 mouths of circulator 40, due to placed a light every a distance on sensor fibre 21
Fiber grating sensor 22 is placed N number of altogether.Therefore after long pulse is washed off into sensor fibre 21, each fiber-optic grating sensor 22
There will be reflected light signal sn to return, wherein n=1,2,3 ... ..., N.
Since position Dn of each fiber-optic grating sensor 22 away from the wide laser 11 of the wide line is different, reflected light
Becoming continuous pulsed light, reflected continuous impulse light enters No. 3 mouths of circulator 40 by No. 2 mouths of circulator 40,
Hence into fiber-optical probe 31, the main function of fiber-optical probe 31 is that optical signal sn is converted into electric signal Sn, then will
Electric signal is conveyed to data acquisition card 32, and the software on signal processor 33 is read by program on data acquisition card 32
Return electric signal Sn data.
Optical signal analysis process includes：After software collection to all return optical signal Sn, t1 on signal processor 33
With the signal Sn at previous time point, t2 is compared and analyzed, as signal Sn, the intensity of t1 and the Strength Changes of signal Sn, t2
Δ Sn is more than certain ratio τ (ratio is determined by different constructing device working characteristics), i.e.,：
Δ Sn=| Sn, t1-Sn, t2 |/Sn, t1 ＞ τ,
The variation delta B of the magnetic field B generations in the place is can determine whether according to Δ Sn, when there be large-scale apply in 21 top of sensor fibre
For work machinery in construction, the changes delta B in magnetic field can be differently formed specific change frequency Δ f according to construction machinery, by again
Δ B, Δ f with identification operative scenario confirmation form are in advance compared, referring to table 1, are by the different change frequency Δ f of secondary analysis
Changes of magnetic field amount and change frequency caused by the different scenes such as the various construction machineries identified in advance are constructed or vehicle passes through, so as to
Judge the operative scenario for causing changes of magnetic field, the process for e.g. really having construction machinery construction or vehicle.
The corresponding changes of magnetic field amount of 1 scene of table and change frequency
| Changes of magnetic field amount Δ B | Change frequency Δ f | Operative scenario |
| ΔBw | Δfw | Excavator |
| ΔBD | ΔfD | Push-bench |
| ΔBc | Δfc | Automobile passes through |
Due to the location information Dn of known each fiber-optic grating sensor 22, so as to judge that institute is right at changes of magnetic field Δ B
The fiber position information Dn answered.
The port of the end of sensor fibre 21 is provided with minute surface, and it is anti-the pulsed light for entering sensor fibre 21 can be done minute surface
It penetrates, fiber-optical probe 31 detects reflected light signal sr rather than scattered light signal ss in sensor fibre 21.
The continuous impulse light of reflection generates corresponding changes delta sr after being influenced by external magnetic field changes delta B, through optical fiber
After detector 31 (if using 8 fiber gratings, needing 8 fiber-optical probes 31) is collected, through 32 (A/D of data acquisition card
Capture card is 8 channels, per one optical fiber of Air conduct measurement) electric signal Sr is converted optical signals to, generate special identifiable wave
Shape analyzes investigation distracter using 33 software of signal processor, infers the condition of construction near optical fiber.
As can be seen from the above description, concrete application example of the invention detects the light of changes of magnetic field by being used on sensor fibre
Fine grating, when the magnetic field around sensor fibre changes, system passes through to reflecting light collection so as to judge that magnetic field becomes
The position of change.The system structure is simple, at low cost, and precision is high, and mounting, commissioning and maintenance is more convenient, can be reliably and with long-term be used for
It works in adverse circumstances, there are the advantages such as corrosion-resistant, anti-interference, have a very wide range of applications scene；Compared to based on distribution
The system that fiber-optic vibration perceives, possesses simple in structure, and at low cost, precision is high, and mounting, commissioning and maintenance is quite convenient to, can grow
Phase, had a very wide range of applications scene reliably for working in adverse circumstances.
The embodiment of the present invention six provides a kind of a kind of specific implementation of the ground magnetic field monitoring method based on fiber grating
Mode.Referring to Fig. 8, which includes following content：
Step 100：Pulsed light is generated in magnetic field of the goal monitoring range, and the pulsed light is transmitted to and is embedded in ground table
Sensor fibre under layer.
Step 200：When sensor fibre receives optical signal, multiple optical signals are acquired respectively at different locations.
Step 300：Multiple optical signals of acquisition are converted into electric signal.
Step 400：The ground magnetic field in the monitoring range of current goal magnetic field is monitored according to multiple electric signals.
As can be seen from the above description, the embodiment of the present invention realizes the vibration letter for the different location that ground is collected by optical fiber
Number, the oscillation intensity of the vibration source on ground is judged by the vibration signal of different location, and then improve and ground magnetic field is monitored
And the accuracy and reliability judged；By changes of magnetic field near detection optical fiber, realize to construction around optical fiber and artificial instrument
The accurate investigation destroyed and early warning, and then realize that the early warning that pipe network is completed from another angle is safeguarded.
The embodiment of the present invention seven provides a kind of specific embodiment of step 100 in above-mentioned monitoring method.Referring to Fig. 9,
The step 100 includes following content：
Step 101：Pulsed light is generated in magnetic field of the goal monitoring range.
Step 102：Optical signal amplification is carried out, and amplified pulsed light is transmitted to and is embedded in ground to the pulsed light
Sensor fibre under surface layer.
As can be seen from the above description, the embodiment of the present invention can periodically generate pulsed light, the pulsed light obtained in real time
It ensure that the promptness for obtaining ground magnetic field variation.
The embodiment of the present invention eight further includes a kind of tool of step A00 before providing the step 300 in above-mentioned monitoring method
Body embodiment.Include following content referring to Figure 10, step A00：
Step A00：Carry out mirror-reflection to the optical signal that is transmitted in the sensor fibre, and by the reflected light signal
It is converted into electric signal.
As can be seen from the above description, the embodiment of the present invention gives another realization method for being capable of reflecting light signal, real
Show accurately to investigate distracter according to the reflected light signal and infer and learnt condition of construction near optical fiber.
The embodiment of the present invention nine provides a kind of specific embodiment of step 400 in above-mentioned monitoring method.Referring to Figure 11,
The step 400 includes following content：
Step 401：According to the corresponding each electric signal of different time points, magnetic in the monitoring range of current goal magnetic field is determined
Field intensity changes.
Step 402：If through judging to know that presently described change of magnetic field strength is more than preset strength threshold value, the magnetic field is obtained
The change frequency value of Strength Changes.
Step 403：It is determined in preset frequency scene table to cause what current magnetic field changed according to the change frequency value
Scene.
Wherein, the frequency scene table is for storage change frequency values and the correspondence of each scene.
As can be seen from the above description, the embodiment of the present invention can be believed according to the optical signal and reflected light of the different time points
Number, it is accurate to investigate distracter and infer the condition of construction learnt near optical fiber, obtain ground magnetic field variation and vibration source.
The embodiment of the present invention ten provides a kind of ground magnetic field monitoring device based on fiber grating, and referring to Figure 12, this sets
It is standby specific as follows：
Processor (processor) 801, memory (memory) 802, communication interface (Communications
Interface) 803 and bus 804；
Wherein,
The processor 801, memory 802, communication interface 803 complete mutual communication by the bus 804；
The communication interface 803 puts the information transmission between logical equipment and the communication equipment of charge system for this automatically；
The processor 801 is used to call the program instruction in the memory 802, to perform above-mentioned each method embodiment
The method provided, such as including：Pulsed light is generated in magnetic field of the goal monitoring range, and the pulsed light is transmitted to and is embedded in
Sensor fibre under the surface layer of ground；When sensor fibre receives optical signal, multiple optical signals are acquired respectively at different locations；
Multiple optical signals of acquisition are converted into electric signal；According to multiple electric signals to the ground in the monitoring range of current goal magnetic field
Face magnetic field is monitored.
The embodiment of the present invention 11 provides a kind of computer program product, and the present embodiment discloses a kind of computer program production
Product, the computer program product include the computer program being stored on non-transient computer readable storage medium storing program for executing, the meter
Calculation machine program includes program instruction, and when described program instruction is computer-executed, it is real that computer is able to carry out above-mentioned each method
The method that example is provided is applied, referring to Fig. 8, such as including：Generate pulsed light in magnetic field of the goal monitoring range, and by the pulsed light
It is transmitted to the sensor fibre being embedded under the surface layer of ground；When sensor fibre receives optical signal, adopt respectively at different locations
Collect multiple optical signals；Multiple optical signals of acquisition are converted into electric signal；According to multiple electric signals to current goal magnetic field
Ground magnetic field in monitoring range is monitored.
The embodiment of the present invention 12 provides a kind of non-transient computer readable storage medium storing program for executing, and the non-transient computer can
Storage medium storage computer instruction is read, the computer instruction is provided the above-mentioned each method embodiment of the computer execution
Method, such as including：Pulsed light is generated in magnetic field of the goal monitoring range, and the pulsed light is transmitted to and is embedded in ground table
Sensor fibre under layer；When sensor fibre receives optical signal, multiple optical signals are acquired respectively at different locations；It will acquisition
Multiple optical signals be converted into electric signal；According to multiple electric signals to the ground magnetic field in the monitoring range of current goal magnetic field
It is monitored.
One of ordinary skill in the art will appreciate that：Realizing all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and aforementioned program can be stored in a computer read/write memory medium, the program
When being executed, step including the steps of the foregoing method embodiments is performed；And aforementioned storage medium includes：ROM, RAM, magnetic disc or light
The various media that can store program code such as disk.
The embodiments such as the ground magnetic field monitoring device based on fiber grating described above are only schematical, wherein
The unit illustrated as separating component may or may not be physically separate, to be shown as unit component
It may or may not be physical unit, you can be located at a place or multiple network element can also be distributed to
On.Some or all of module therein can be selected according to the actual needs to realize the purpose of this embodiment scheme.Ability
Domain those of ordinary skill is not in the case where paying performing creative labour, you can to understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It is realized by the mode of software plus required general hardware platform, naturally it is also possible to pass through hardware.Based on such understanding, on
Technical solution is stated substantially in other words to embody the part that the prior art contributes in the form of software product, it should
Computer software product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, CD, including several fingers
It enables and (can be personal computer, server or the network equipment etc.) so that computer equipment is used to perform each implementation
Method described in certain parts of example or embodiment.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the embodiment of the present invention rather than right
It is limited；Although the embodiment of the present invention is described in detail with reference to foregoing embodiments, the ordinary skill of this field
Personnel should understand that：It can still modify to the technical solution recorded in foregoing embodiments or to which part
Or all technical features carries out equivalent replacement；And these modifications or replacement, it does not separate the essence of the corresponding technical solution
The range of each embodiment technical solution of the embodiment of the present invention.
Claims (10)
1. a kind of ground magnetic field monitoring system based on fiber grating, which is characterized in that the system comprises：Sequentially connected arteries and veins
Wash generating unit, optical fiber grating sensing unit and optical signal processing unit off；
The pulsed light for generating pulsed light, and is transmitted to the optical fiber grating sensing unit by the pulsed light generating unit；
The optical fiber grating sensing unit is embedded under the surface layer of ground, and is reflected for the pulsed light according to reception in different location
Multiple optical signals, and the multiple optical signal is transmitted to the optical signal processing unit；
The optical signal processing unit, for the optical signal of reception to be converted into electric signal, and according to the electric signal to ground
Magnetic field is monitored.
2. system according to claim 1, which is characterized in that the optical fiber grating sensing unit includes：It is embedded in ground
Sensor fibre under surface layer and set up multiple fiber-optic grating sensors in the sensing scope of the sensor fibre separately, and each
Distance between fiber-optic grating sensor and the pulsed light generating unit differs；
The sensor fibre, for receiving the pulsed light of the pulsed light generating unit transmission；
The fiber-optic grating sensor, for when the sensor fibre receives pulsed light, reflected light signal, and each optical fiber
Grating sensor is respectively by optical signal transmission to the optical signal processing unit.
3. system according to claim 2, which is characterized in that far from the pulsed light generating unit on the sensor fibre
One end be equipped with specular-reflection unit；
The specular-reflection unit, for the sensor fibre after the pulsed light for receiving the pulsed light generating unit transmission,
The pulsed light is subjected to mirror-reflection, obtains reflected light signal, and the reflected light signal is sent at the optical signal
Manage unit.
4. system according to claim 1, which is characterized in that the optical signal processing unit includes：Sequentially connected light
Fine detector, data acquisition card and signal processor；
The fiber-optical probe for receiving the optical signal of the optical fiber grating sensing unit reflection, and the optical signal is turned
It turns to electric signal and the electric signal is sent to data acquisition card；
The data acquisition card, for the electric signal received to be sent to the signal processor；
The signal processor is worked as being monitored and determining to cause to ground magnetic field according to the electric signal of reception
The scene of preceding changes of magnetic field.
5. system according to claim 1, which is characterized in that the pulsed light generating unit includes：The width of interconnection
Line width frequency laser and fiber amplifier；
The wide line wideband laser, is washed off for generating long pulse, and by the long pulse optical transport to the fiber amplifier；
The fiber amplifier washes carry out optical signal amplification off for the long pulse to reception, and by amplified pulse optical transport
To the optical fiber grating sensing unit.
6. system according to any one of claims 1 to 5, which is characterized in that the system also includes：
Circulator, the pulsed light for the pulsed light generating unit to be sent out be transmitted to the optical fiber grating sensing unit, with
And by the optical signal transmission of optical fiber grating sensing unit reflection to the optical signal processing unit.
7. a kind of ground magnetic field monitoring method based on fiber grating, which is characterized in that the method includes：
Pulsed light is generated in magnetic field of the goal monitoring range, and the pulsed light is transmitted to the sense light being embedded under the surface layer of ground
It is fine；
When sensor fibre receives optical signal, multiple optical signals are acquired respectively at different locations；
Multiple optical signals of acquisition are converted into electric signal；
And the ground magnetic field in the monitoring range of current goal magnetic field is monitored according to multiple electric signals.
8. the method according to the description of claim 7 is characterized in that described generate pulsed light in magnetic field of the goal monitoring range,
And the pulsed light is transmitted to the sensor fibre being embedded under the surface layer of ground, including：
Pulsed light is generated in magnetic field of the goal monitoring range；
Optical signal amplification is carried out, and amplified pulsed light is transmitted to the sensing being embedded under the surface layer of ground to the pulsed light
Optical fiber.
9. the method according to the description of claim 7 is characterized in that it is described according to multiple electric signals to current goal magnetic field
Ground magnetic field in monitoring range is monitored, and is further included before：
Mirror-reflection is carried out, and the reflected light signal is converted into telecommunications to the optical signal being transmitted in the sensor fibre
Number.
10. according to the method described in claim 9, it is characterized in that, it is described according to multiple electric signals to current goal magnetic
Ground magnetic field in the monitoring range of field is monitored, including：
According to the corresponding each electric signal of different time points, change of magnetic field strength in the monitoring range of current goal magnetic field is determined；
If through judging to know that presently described change of magnetic field strength is more than preset strength threshold value, the change of the change of magnetic field strength is obtained
Change frequency values；
And the scene that current magnetic field is caused to change is determined in preset frequency scene table according to the change frequency value；
Wherein, the frequency scene table is for storage change frequency values and the correspondence of each scene.
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