CN105784098B - A kind of fiber-optic vibration detection method, apparatus and system - Google Patents
A kind of fiber-optic vibration detection method, apparatus and system Download PDFInfo
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- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
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Abstract
The invention discloses a kind of fiber-optic vibration detection methods, apparatus and system, this method comprises: obtaining the signal value at target fiber position multiple moment when receiving fiber optic telecommunications；Determine the first average value of target fiber position the totally first quantity moment corresponding signal value adjacent before object time and object time；Determine the second average value of target fiber position the second quantity moment corresponding signal value adjacent before the first quantity moment；If the first average value is greater than the second average value, record target fiber position is first state, if the first average value is less than or equal to the second average value, record target fiber position is the second state；And when the state of target fiber position changes, determine that target fiber position is vibrated.By the above-mentioned means, the present invention can be improved the precision and efficiency of fiber-optic vibration positioning.
Description
Technical field
The present invention relates to fiber optic communication fields, more particularly to a kind of fiber-optic vibration detection method, apparatus and system.
Background technique
Optical fiber is writing a Chinese character in simplified form for optical fiber, is a kind of fiber made of glass or plastics, can be used as light conduction tool, passes
Defeated principle is the total reflection of light.Most optical fiber must be coated before by several layers of protection structures, and the cable after cladding is claimed
For optical cable.
With the development of optical fiber technology, fiber-optic vibration early warning system achieves extensive research in recent years.Fiber-optic vibration is pre-
It is alert that the vibration of optical fiber is mainly judged by the variation of signal in detection fiber, to judge the vibration feelings of optical fiber ambient enviroment
Condition.Mainly there are two class technologies of interference and reflection in terms of fiber optic sensor system.
Optical time domain reflectometer (Optical Time Domain Reflectometer, OTDR) is using light in optical fiber
The optoelectronic integration instrument of backscattering caused by Rayleigh scattering and Fresnel reflection when middle transmission and manufactured precision, when
When having big disturbance that optical fiber is caused to bend or deform on optical fiber, back scattering will occur in the position, through photoelectricity
Detector can measure these mutation, realize the disturbance positioning on optical fiber.It is widely used in the maintenance of lightguide cable link, constructs it
In, the measurement of fiber lengths, the transmission attenuation of optical fiber, connector decaying and fault location etc. can be carried out.
What OTDR was detected is the vibrations synthesis signal of whole optical fiber, when detection positions concurrent vibration source, performance degradation
Even it can not work normally.Also, the detectivity of OTDR is very low, since the rear orientation light of generation is very weak, so being based on
The distributed optical fiber sensing system of optical time domain reflection technology can only carry out static measurement, and application range is limited.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of fiber-optic vibration detection method, apparatus and system, Neng Gouti
The precision and efficiency of high fiber-optic vibration positioning.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of fiber-optic vibration detection side is provided
Method, this method comprises: obtaining the signal value at target fiber position multiple moment when receiving fiber optic telecommunications；Wherein, optical fiber
Electric signal is converted to by the optical signal of fiber reflection；Determine target fiber position before object time and object time
First average value of adjacent the totally first quantity moment corresponding signal value；Determine target fiber position in the first quantity
Second average value of adjacent the second quantity moment corresponding signal value before quarter；If it is average that the first average value is greater than second
Value, record target fiber position is first state, if the first average value is less than or equal to the second average value, records target optical fiber position
It is set to the second state；And when the state of target fiber position changes, determine that target fiber position is vibrated.
Wherein, this method further include: flat with the second average value and first when the state of target fiber position changes
The difference of mean value as target fiber position object time Oscillation Amplitude；When the state of target fiber position does not change
When, using 0 as target fiber position object time Oscillation Amplitude.
Wherein, fiber optic telecommunications number are digital electric signal；Wherein, digital electric signal is converted by analog electrical signal,
Analog electrical signal is converted to by the optical signal of fiber reflection.
Wherein, this method further include: determine the signal transmission distance between target fiber position and optical fiber starting point；According to pre-
If calibration data and signal transmission distance determine the actual range between target fiber position and optical fiber starting point；Wherein, presetting
Data are marked by multiple specified actual ranges and the signal transmission distance being calculated according to the vibration signal of multiple specified actual ranges
It is obtained from comparison.
Wherein it is determined that the signal transmission distance between target fiber position and optical fiber starting point, specifically: according to formula L=
(c*T/n)/2 the distance between target fiber position and optical fiber starting point are calculated；Wherein, c is the speed of light in a vacuum, and T is mesh
Time span of the fiber position in fiber optic telecommunications number is marked, n is the refractive index of optical fiber.
Wherein, the first quantity is less than the second quantity.
Wherein, in multiple moment, the time interval between two adjacent moment is 1ms.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of fiber-optic vibration detection dress is provided
It sets, which includes: sampling module, for obtaining the letter at target fiber position multiple moment when receiving fiber optic telecommunications
Number value, wherein fiber optic telecommunications number are converted to by the optical signal of fiber reflection；Determining module, for determining target optical fiber
First average value of position the totally first quantity moment corresponding signal value adjacent before object time and object time；With
And determine the second of target fiber position the second quantity moment corresponding signal value adjacent before the first quantity moment
Average value；Logging modle is used for when the first average value is greater than the second average value, and record target fiber position is first state,
When the first average value is less than or equal to the second average value, record target fiber position is the second state；Determining module is vibrated, is used
In when the state of target fiber position changes, determine that target fiber position is vibrated.
Wherein, the device further include: amplitude confirmation module, for changing in the state of the target fiber position
When, using the difference of second average value and first average value as the target fiber position in the object time
Oscillation Amplitude；Or when the state of the target fiber position does not change, using 0 as the target fiber position described
The Oscillation Amplitude of object time.
In order to solve the above technical problems, one technical scheme adopted by the invention is that: a kind of fiber-optic vibration detection system is provided
System, which includes: signal receiving/transmission device, for inputting the first optical signal from optical fiber starting point and obtaining the first optical signal in optical fiber
It is middle to reflect the second obtained optical signal；Photoelectric conversion device, for converting analog electrical signal for the second optical signal；Digital-to-analogue conversion
Device, for converting digital electric signal for analog electrical signal；And fiber-optic vibration detection device；Wherein, fiber-optic vibration detects
Device is fiber-optic vibration detection device as above.
The beneficial effects of the present invention are: being in contrast to the prior art, the present invention can be by a fiber position
The signal of different moments is detected, by the way of zero passage detection fast and accurately to some position in optical fiber whether
Vibration is judged, the sensitivity and efficiency of fiber-optic vibration monitoring are improved.
Detailed description of the invention
Fig. 1 is the flow diagram of one embodiment of fiber-optic vibration detection method of the present invention；
Fig. 2 is the schematic diagram of fiber optic telecommunications number in one embodiment of fiber-optic vibration detection method of the present invention；
Fig. 3 is the amplitude schematic diagram of different fiber positions in one embodiment of fiber-optic vibration detection method of the present invention；
Fig. 4 is the structural schematic diagram of one embodiment of fiber-optic vibration detection device of the present invention；
Fig. 5 is the structural schematic diagram of another embodiment of fiber-optic vibration detection device of the present invention；
Fig. 6 is the structural schematic diagram that fiber-optic vibration detection system of the present invention unifies embodiment.
Specific embodiment
Refering to fig. 1, the flow diagram of one embodiment of fiber-optic vibration detection method of the present invention, this method comprises:
S11: when receiving fiber optic telecommunications, the signal value at target fiber position multiple moment is obtained；Wherein, optical fiber electricity
Signal is converted to by the optical signal of fiber reflection.
Optionally, the optical signal of fiber reflection is the first optical signal for being passed through from optical fiber starting point each position warp in a fiber
Cross Rayleigh scattering formation and reflection the second optical signal.
Optionally, fiber optic telecommunications number are digital electric signal；Wherein, digital electric signal is to convert to obtain by analog electrical signal
, analog electrical signal is converted to by the optical signal of fiber reflection.Due to the optical signal of backscattering and its faint, and its
Noise is smaller, and difficulty is larger during to optical signal prosessing, precision is smaller, therefore converts optical signal into analog telecommunications
Number be convenient for signal processing.Here it can be converted by general photoelectric converter, such as APD (Avalanche Photo
Diode, avalanche photodide) etc..
Optionally, analog-digital converter can be used by analog electrical signal being converted to digital electric signal.
Optionally, the frequency of sampling can be arbitrarily arranged according to the precision of detection, in one embodiment, the frequency of sampling
Rate being passed through frequency and determine according to the first optical signal.For example, the first optical signal is the pulsed optical signals being continuously passed through,
After being passed through the first optical signal, constantly the second optical signal of reflection is sampled in optical fiber starting point, then passes through photoelectric conversion
Digital electric signal is obtained with analog-to-digital conversion.For example, the first optical signal is the optical signal that pulse width is 10ns, according to formula L=
(c*T/n)/2, it is assumed that take light velocity c=3*108M/s, T=10ns, n=1.5, then L=1m, i.e., every 1 meter of optical fiber can obtain
To a signal value, then can sample to obtain optical fiber starting point to totally 100000 signals at 100 kilometers of optical fiber every 1ms
Value.
Further, next 1ms can just obtain the signal from optical fiber origin-to-destination totally 100000 positions again, in this way,
The same position will obtain a signal value in every 1ms, it can obtain the signal value of the every 1ms of target fiber position.
It is worth noting that, 10ns and 1ms here be citing, in practice, can according to the length of optical fiber,
The frequency of sampling carrys out any setting.
S12: target fiber position the totally first quantity moment pair adjacent before object time and object time is determined
First average value of the signal value answered.
Wherein, signal value is the amplitude of target fiber position at a time.
Optionally, object time refer to need to judge target fiber position at the time of sometime whether vibrating, due to
Vibration detection is real-time, is mainly used for judging whether optical fiber current time has vibration, we generally require detecting vibration
It gives notice immediately when dynamic information, therefore object time can be the current time for getting newest fiber optic telecommunications number.If
Existing data are handled, to judge whether optical fiber once had vibration, which is also possible to past
It anticipates a moment.
It, may be internal due to signal interference etc. since target fiber position is too strong in the randomness of the signal value at a moment
Or external reason causes the signal value at this moment abnormal, therefore multiple moment of the selection here including object time
The average value of signal value.
Referring to Fig.2, in one embodiment of fiber-optic vibration detection method of the present invention target fiber position signal value schematic diagram.
A indicates that the first quantity moment corresponding signal value, B indicate the second quantity moment corresponding signal value.Here
The first quantity in figure is 5, the second quantity is 20 and only illustrates.
S13: target fiber position the second quantity moment corresponding letter adjacent before the first quantity moment is determined
Number value the second average value.
Optionally, the second quantity is greater than the first quantity.Due to next needing the average value of the first quantity signal value
It compares, therefore in one embodiment, the second quantity can be arranged with the average value of the second quantity signal value before
It is larger, can preferably embody variation of the signal relative to signal before in the first quantity in this way.In other implementations
In mode, the first quantity can also be enabled and the second quantity is equal or the second quantity is less than the first quantity.
S14: if the first average value is greater than the second average value, record target fiber position is first state, if first is average
Value is less than or equal to the second average value, and record target fiber position is the second state.
Optionally, the first quantity is 16, i.e. 16ms, and the second quantity is 128, i.e. 128ms.Wherein, the first average value is
DataVector, the second average value are MeanData, to the state of target fiber position be arranged a current state mark flag with
And last status indication pre_flag, with " 1 " for first state, with " -1 " for the second state.It should be understood that with the time
Variation, the first average value DataVector, the second average value MeanData, current state label flag and last label
Pre_flag is continually changing.
Specifically, as DataVector > MeanData, flag=1 is enabled；As DataVector≤MeanData, enable
Flag=-1.
S15: when the state of target fiber position changes, determine that target fiber position is vibrated.
Wherein, the state of the target fiber position namely flag that changes changes, in other words flag and pre_
Flag is different.
Optionally, current status indication flag and the system last status indication pre_flag saved can be carried out
Compare, if the value of flag-pre_flag is equal to 0 (i.e. 1-1=0 or -1- (- 1)=0), then it represents that the target fiber position
No change has taken place for state, if the value of flag-pre_flag is equal to 2 or -2 (i.e. 1- (- 1)=2 or -1- (1)=- 2),
The state for representing the target fiber position is changed, i.e. target fiber position is vibrated.
Optionally, when detecting for the first time, pre_flag=-1 can be defaulted；In addition, if of the first quantity and the second quantity
Number is unsatisfactory for preset quantity, can reduce quantity or default pre_flag=-1.
The above S14 and S15 and its optional embodiment, we term it " zero passage detections ".
Optionally, when the state of target fiber position changes, with the difference of the second average value and the first average value
As target fiber position object time Oscillation Amplitude；When the state of target fiber position does not change, using 0 as
Oscillation Amplitude of the target fiber position in object time.
Specifically, if the value of flag-pre_flag is equal to 0, the amplitude of the target fiber position is 0 deposit system, if
The value of flag-pre_flag is equal to 2 or -2, just using the absolute value of the difference of DataVector-MeanData as the target light
The amplitude of fine position is stored in system.
Optionally, after the state judgement at a moment is completed, pre_flag is updated to the value of current flag, and
MeanData and DataVector is updated, continues to carry out detection judgement to the signal value of following instant.
Refering to Fig. 3, the amplitude schematic diagram of different fiber positions in one embodiment of fiber-optic vibration detection method of the present invention.
Wherein, abscissa indicates fiber position, i.e. the distance between the certain point of optical fiber and optical fiber starting point, and ordinate indicates
A certain fiber position current time Oscillation Amplitude (difference of 0 or DataVector-MeanData in i.e. discussed above it is exhausted
To value).Since the Oscillation Amplitude of each fiber position is continually changing, so the signal value of each position is not in Fig. 3
Disconnected variation, when the status indication of certain point is changed, illustrates that the point vibrates, just show the amplitude of the point.
For example, we can with it is seen from figure 3 that, have slight vibration between optical fiber starting point 120m-140m；In another example
There is biggish vibration between optical fiber starting point 280m-300m.
Furthermore it is also possible to fiber-optic vibration feelings in such a way that global histogram+details histogram+history graphs combine
Condition is shown, and above-mentioned Fig. 3 is global histogram, comprises only limit by selecting or inputting a certain distance or distance segment to show
The details histogram of a (such as 9) distance；Can also be shown by selecting or inputting a certain distance or distance segment this away from
From or distance segment history amplitude.
Optionally, can also include: after S15
S16: the signal transmission distance between target fiber position and optical fiber starting point is determined.
Optionally, the signal transmission distance between target fiber position and optical fiber starting point is determined, specifically: according to formula L
=(c*T/n)/2 calculates the distance between target fiber position and optical fiber starting point；Wherein, c is the speed of light in a vacuum, and T is
Time span of the target fiber position in fiber optic telecommunications number, n are the refractive index of optical fiber.
It is worth noting that, T here is different with " moment " mentioned above.For example, every 1ms is passed through to optical fiber
One optical signal and reflect obtain the second optical signal, obtain fiber optic telecommunications number using photoelectric conversion and analog-to-digital conversion.Due to difference
Time of fiber position reflected light signal is different, and the signal apart from the remoter reflection of optical fiber starting point is weaker, therefore, obtain this
Fiber optic telecommunications number are the deamplification for continuing an extremely short time (being often much smaller than 1ms), can pass through this signal
In different time different fiber positions is calculated.
S17: the reality between target fiber position and optical fiber starting point is determined according to default calibration data and signal transmission distance
Border distance；Wherein, calibration data are preset by multiple specified actual ranges and according to the vibration signal meter of multiple specified actual ranges
Obtained signal transmission distance compares to obtain.
Since optical fiber has bending in the duct, spirals, the fiber position measured is only capable of calculating the letter of optical fiber
Number transmission range (i.e. the length of optical fiber) rather than the distance of practical road surface or pipeline, thus can make a fiber position with
The corresponding calibration data of actual range.
For example, manually or mechanically the optical fiber of specified actual range can be enabled to vibrate using modes such as percussions, simultaneously
It receives data corresponding signal transmission distance is calculated and keeps, repeatedly the optical fiber of different physical locations be measured, just
It can establish actual range and the one-to-one calibration data of signal transmission distance.
Specifically, when manually or mechanically tapping the optical fiber of specified actual range, according to the above global histogram, in amplitude
Change and records distance value identical with specified actual range on maximum histogram.It is different from the prior art, present embodiment is logical
It crosses and the signal of a fiber position different moments is detected, fast and accurately in optical fiber by the way of zero passage detection
Some position whether vibrate and judged, improve the sensitivity and efficiency of fiber-optic vibration monitoring.
Refering to Fig. 4, the structural schematic diagram of one embodiment of fiber-optic vibration detection device of the present invention, which includes:
Sampling module 41, for obtaining the signal value at target fiber position multiple moment when receiving fiber optic telecommunications,
Wherein, fiber optic telecommunications number are converted to by the optical signal of fiber reflection.
Determining module 42, for determining target fiber position the totally first number adjacent before object time and object time
Measure the first average value of moment corresponding signal value；And determine that target fiber position is adjacent before the first quantity moment
The second quantity moment corresponding signal value the second average value.
Logging modle 43, for when the first average value is greater than the second average value, record target fiber position to be the first shape
State, when the first average value is less than or equal to the second average value, record target fiber position is the second state.
Determining module 44 is vibrated, for determining target fiber position mesh when the state of target fiber position changes
Mark fiber position is vibrated.
Optionally, which further includes amplitude confirmation module, for changing in the state of the target fiber position
When, using the difference of second average value and first average value as the target fiber position in the present sample
The Oscillation Amplitude at quarter；Or when the state of the target fiber position does not change, exist using 0 as the target fiber position
The Oscillation Amplitude of the current sample time.
Optionally, which further includes apart from confirmation module, for determining between target fiber position and optical fiber one end
Signal transmission distance；The reality between target fiber position and optical fiber one end is determined according to default calibration data and signal transmission distance
Border distance；Wherein, calibration data are preset by multiple specified actual ranges and according to the vibration signal meter of multiple specified actual ranges
Obtained signal transmission distance compares to obtain.
Specifically, it is specifically used for calculating target fiber position and optical fiber according to formula L=(c*T/n)/2 apart from confirmation module
The distance between one end；Wherein, c is the speed of light in a vacuum, and T is that time of the target fiber position in fiber optic telecommunications number is long
Degree, n are the refractive index of optical fiber.
Present embodiment is the device based on above embodiment, and embodiments thereof are similar, and which is not described herein again.
Refering to Fig. 5, the structural schematic diagram of another embodiment of fiber-optic vibration detection device of the present invention, the device 50 includes place
Manage device 51, memory 52, input unit 53 and output device 54.Wherein, processor 51, memory 52, input unit 53 with
And output device 54 may each be one or more, in Fig. 5 only for one, they can be connected by bus.
Memory 52 is for storage system program, operation program or some necessary datas etc..
Processor 51 is for executing following steps:
When receiving fiber optic telecommunications, the signal value at target fiber position multiple moment is obtained；Wherein, fiber optic telecommunications number
It is to be converted to by the optical signal of fiber reflection；Determine that target fiber position is adjacent before object time and object time
First average value of the totally first quantity moment corresponding signal value；Determine target fiber position before the first quantity moment
Second average value of adjacent the second quantity moment corresponding signal value；If the first average value is greater than the second average value, record
Target fiber position is first state, if the first average value is less than or equal to the second average value, record target fiber position is the
Two-state；And when the state of target fiber position changes, determine that target fiber position is vibrated.
Processor 51 is also used to execute following steps:
When the state of target fiber position changes, using the difference of the second average value and the first average value as target
Oscillation Amplitude of the fiber position in object time；When the state of target fiber position does not change, using 0 as target optical fiber
Oscillation Amplitude of the position in object time.
Processor 51 is also used to execute following steps:
Determine the signal transmission distance between target fiber position and optical fiber starting point；It is passed according to default calibration data and signal
Defeated distance determines the actual range between target fiber position and optical fiber starting point；Wherein, calibration data are preset by multiple specified realities
Border distance and compare to obtain according to the signal transmission distance that the vibration signal of multiple specified actual ranges is calculated.
Wherein it is determined that the signal transmission distance between target fiber position and optical fiber starting point, specifically: according to formula L=
(c*T/n)/2 the distance between target fiber position and optical fiber starting point are calculated；Wherein, c is the speed of light in a vacuum, and T is mesh
Time span of the fiber position in fiber optic telecommunications number is marked, n is the refractive index of optical fiber.
In several embodiments provided by the present invention, it should be understood that disclosed method and device, Ke Yitong
Other modes are crossed to realize.For example, device embodiments described above are only schematical, for example, the module or
The division of unit, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units
Or component can be combined or can be integrated into another system, or some features can be ignored or not executed.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.Some or all of unit therein can be selected to realize present embodiment scheme according to the actual needs
Purpose.
In addition, each functional unit in each embodiment of the present invention can integrate in one processing unit, it can also
To be that each unit physically exists alone, can also be integrated in one unit with two or more units.It is above-mentioned integrated
Unit both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit in above-mentioned other embodiments is realized in the form of SFU software functional unit and as independence
Product when selling or using, can store in a computer readable storage medium.Based on this understanding, of the invention
Technical solution substantially all or part of the part that contributes to existing technology or the technical solution can be in other words
It is expressed in the form of software products, which is stored in a storage medium, including some instructions are used
So that a computer equipment (can be personal computer, server or the network equipment etc.) or processor
(processor) all or part of the steps of each embodiment the method for the present invention is executed.And storage medium packet above-mentioned
It includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random
Access Memory), the various media that can store program code such as magnetic or disk.
Refering to Fig. 6, fiber-optic vibration detection system of the present invention, which includes:
Signal receiving/transmission device 61 is used to input the first optical signal from optical fiber starting point and the first optical signal of acquisition is anti-in a fiber
The second optical signal penetrated.
Photoelectric conversion device 62, for converting analog electrical signal for the second optical signal.
Digiverter 63, for converting digital electric signal for analog electrical signal.
Fiber-optic vibration detection device 64；Wherein, fiber-optic vibration detection device 64 is such as the light in above each embodiment
Fine vibration detection device, embodiments thereof are similar, and which is not described herein again.
Mode the above is only the implementation of the present invention is not intended to limit the scope of the invention, all to utilize this
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field is included within the scope of the present invention.
Claims (10)
1. a kind of fiber-optic vibration detection method characterized by comprising
When receiving fiber optic telecommunications, the signal value at target fiber position multiple moment is obtained；Wherein, the fiber optic telecommunications number
It is to be converted to by the optical signal of fiber reflection；
Determine the target fiber position the totally first quantity moment pair adjacent before object time and the object time
First average value of the signal value answered；
Determine the target fiber position the second quantity moment corresponding letter adjacent before the first quantity moment
Number value the second average value；
If first average value is greater than second average value, recording the target fiber position is first state, if described
First average value is less than or equal to second average value, and recording the target fiber position is the second state；And
When the state of the target fiber position changes, determine that the target fiber position is vibrated.
2. the method according to claim 1, wherein further include:
When the state of the target fiber position changes, with the difference of second average value and first average value
As the target fiber position the object time Oscillation Amplitude；
When the state of the target fiber position does not change, using 0 as the target fiber position in the target
The Oscillation Amplitude at quarter.
3. the method according to claim 1, wherein the fiber optic telecommunications number are digital electric signal；
Wherein, the digital electric signal is converted by analog electrical signal, and the analog electrical signal is by fiber reflection
What optical signal was converted to.
4. according to the method described in claim 3, it is characterized by further comprising:
Determine the signal transmission distance between the target fiber position and optical fiber starting point；
It is determined between the target fiber position and the optical fiber starting point according to default calibration data and the signal transmission distance
Actual range；Wherein, the default calibration data are by multiple specified actual ranges and according to the multiple specified actual range
The signal transmission distance that is calculated of vibration signal compare to obtain.
5. according to the method described in claim 4, it is characterized in that, the determination target fiber position and the optical fiber rise
Signal transmission distance between point, specifically:
The distance between the target fiber position and the optical fiber starting point are calculated according to formula L=(c*T/n)/2；Wherein, c is
The speed of light in a vacuum, T are time span of the target fiber position in the fiber optic telecommunications number, and n is the optical fiber
Refractive index.
6. the method according to claim 1, wherein first quantity is less than second quantity.
7. the method according to claim 1, wherein in the multiple moment, between two adjacent moment
Time interval is 1ms.
8. a kind of fiber-optic vibration detection device characterized by comprising
Sampling module, for obtaining the signal value at target fiber position multiple moment when receiving fiber optic telecommunications, wherein
The fiber optic telecommunications number are converted to by the optical signal of fiber reflection；
Determining module, for determining the target fiber position adjacent totally first before object time and the object time
First average value of quantity moment corresponding signal value；And
Determine the target fiber position the second quantity moment corresponding letter adjacent before the first quantity moment
Number value the second average value；
Logging modle, for when first average value is greater than second average value, recording the target fiber position to be
First state, when first average value is less than or equal to second average value, recording the target fiber position is the
Two-state；
Determining module is vibrated, for determining the target fiber position when the state of the target fiber position changes
It vibrates.
9. device according to claim 8, which is characterized in that further include:
Amplitude confirmation module, for when the state of the target fiber position changes, with second average value and institute
State the difference of the first average value as the target fiber position the object time Oscillation Amplitude；Or
When the state of the target fiber position does not change, using 0 as the target fiber position in the target
The Oscillation Amplitude at quarter.
10. a kind of fiber-optic vibration detection system characterized by comprising
Signal receiving/transmission device, for inputting the first optical signal from optical fiber starting point and obtaining first optical signal in the optical fiber
Reflect the second obtained optical signal；
Photoelectric conversion device, for converting analog electrical signal for second optical signal；
Digiverter, for converting digital electric signal for the analog electrical signal；And
Fiber-optic vibration detection device；Wherein, the fiber-optic vibration detection device is fiber-optic vibration as claimed in claim 8 or 9
Detection device.
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| CN201610116794.7A CN105784098B (en) | 2016-03-01 | 2016-03-01 | A kind of fiber-optic vibration detection method, apparatus and system |
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| CN201610116794.7A CN105784098B (en) | 2016-03-01 | 2016-03-01 | A kind of fiber-optic vibration detection method, apparatus and system |
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| CN105784098B true CN105784098B (en) | 2019-03-12 |
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