CN107483104B - Backwards to pulsed light fiber switch sensing node sequence detecting apparatus - Google Patents
Backwards to pulsed light fiber switch sensing node sequence detecting apparatus Download PDFInfo
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Abstract
The invention discloses backwards to pulsed light fiber switch sensing node sequence detecting apparatus, data collector, denoising module, pulse peak positions mark module, position memory are sequentially connected, wherein, denoising module includes smoother and buffer, and pulse peak positions mark module includes pulse high level recognition unit.It is existing to be difficult to distinguish at fiber coupling in sample point data because of the reflected impulse light for the bad generation that is of coupled connections and the regular reflection pulsed light of sensing node backwards to pulsed light fiber switch sensing node sequence detecting apparatus.It simultaneously may be by the noise jamming from optical path or circuit, so that existing be more difficult to that the pulse signal section position of each sensing node reflection is accurately positioned in the data that periodic cycle samples backwards to pulsed light fiber switch sensing node sequence detecting apparatus backwards to pulsed optical signals.The solution of sensing node position for identification that the present invention provides a kind of in the pulsed light fiber switch sensor-based system.
Description
Technical field
The invention belongs to sensory field of optic fibre, examine more particularly, to backwards to pulsed light fiber switch sensing node sequence
Survey device.
Background technique
Fiber cable cross connection box is to provide the handover equipment of optic fiber distribution, jumper connection for main dried layer optical cable, wiring layer optical cable.Optical cable draws
After entering fiber cable cross connection box, after fixation, termination, with fibre, trunk layer optical cable is connected to wiring layer optical cable using jumping fiber.It is led
It is used to connect backbone optical cable and branched cable in fiber optic cable communications network, termination protection, connection and scheduling is carried out to optical cable, optical fiber
The distribution plant of management.
With the popularization of Optical Fiber Subscriber Access Network (FTTx, Fiber-to-the-x) technology, the extension of Various types of data business,
Access of the fiber cable cross connection box for fiber cable network is largely arranged in operator in city.But most of fiber cable cross connection box is mounted on
Outdoor is again the mute resource for carrying a large amount of important services in case, as inactive component, longtime running outdoors, changeable periphery
Environment causes potential threat to the safe operation of fiber cable cross connection box, and maintenance personnel can not distally be managed and monitoring is one
A very serious and urgent problem to be solved.This is because a large amount of fiber cable cross connection box is all branch's distribution of optical fiber passive connection
Device case, fiber cable cross connection box are dispersed in each corner in city, can not accomplish the access and management of power supply, therefore general electric transducer
It can not be applied.There is operator to design and develop the cross-connecting box management system of solar energy and battery, still, this kind of equipment investment
At high cost, operation maintenance cost is also high, thus is difficult to popularize.It is made because fiber cable cross connection box is by unauthorised broken, casualty loss
At fiber-optic signal failure have resulted in a large amount of O&M of operator and traffic lost, it is serious or even cause political impact.
Therefore, the safety for ensureing cross-connecting box is the most important condition that Logistics networks last one kilometer can be unobstructed.
In order to ensure the safety of cross-connecting box, objectively need a kind of chamber door that can detecte fiber cable cross connection box on and off
Technological means and sensing equipment, to judge whether fiber cable cross connection box is illegally opened, still, fiber cable cross connection box for optical fiber jump
Fibre does not provide power supply.So objectively requiring the switch sensor is inactive component.The door opening or closing shape that sensing equipment is detected
State amount is also required to pass to background system in the case of not powering.For this purpose, Publication No. CN205861075U and
The Chinese patent application of CN205861076U discloses a kind of reflective switch sensor based on optical fiber and a kind of based on optical fiber
Transmission-type switch sensor, the light beam reflected light on-off in the sensor that is issued using DC light source expresses sensor
Open and-shut mode.The door leaf that these two types of switch sensors have been applied in distributing box of communication optical cable is opened, in closure sensing, by anti-
The monitoring of the multiple leaf door page to more fiber cable cross connection boxes may be implemented in the combination for penetrating formula Yu two kinds of sensors of transmission-type.
But for the signal resolution equipment for handling reflected light signal can only by the presence of reflected light in optical fiber with
The no door leaf open and-shut mode to judge single fiber optic cable cross-connecting box, i.e. single fiber optic cable cross-connecting box correspond to a signal resolution equipment, this
It results in needing to complete using a large amount of idle fiber resources to multiple fiber cable cross connection box door leaf open and-shut modes in practical application
Monitoring, and then the deployment of optical fiber sensing system is caused to may cause the reduction of telecom operators' fiber optic network dilatation ability.This
Outside, fiber cable cross connection box is generally along optical cable tunnel-type at tandem semicircular configuration.Due to base station equipment size reduction in recent years,
Communications equipment room becomes fewer and fewer, causes to be difficult to find that enough communications equipment rooms are disposed nearby for handling reflection now
The signal resolution equipment of optical signal.Therefore the applicant have also been devised a kind of fiber switch sensing network with backwards to pulsed light optical fiber
Multiple fiber cable cross connection boxes are carried out networking by junction sensor, realize and provided using less optical fiber by switching node sensor
Source solves since communications equipment room is less the function of the networking monitoring of multiple fiber cable cross connection boxes, it is difficult to find enough lead to
Letter computer room disposes the technical problem of the signal resolution equipment for handling reflected light signal nearby.
Backwards to pulsed light fiber switch sensing node switch state detecting system in order to obtain fiber switch junction sensor
Switch state firstly the need of obtain sensing network in sensing node order, number and its peak value of pulse in the sampling period
The position of interior sample data sequence, thus according to pulsed light and its pulsed light peak strength, timing and time slot backwards according to node
The accurate predicate node switch state of sequence.It is general in past pulse peak positions labelling apparatus directly to be sampled in pulse temporal
The single or continuous position for exceeding energy threshold is searched in signal.This method is difficult to distinguish fiber coupling in sample point data
Place is because of the reflected impulse light for the bad generation that is of coupled connections and the regular reflection pulsed light of sensing node.In addition backwards to pulsed optical signals
It may be by the noise jamming from optical path or circuit.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides backwards to pulsed light fiber switch sensing section
Point sequence detection method, it is intended that accurately to provide fiber switch biography backwards to pulsed light fiber switch sensing and detecting system
The timing information backwards to pulsed light that sense node is reflected back.
To achieve the goals above, the present invention provides backwards to pulsed light fiber switch sensing node sequence detecting method,
It is comprised the following structure:
Data collector, denoising module, pulse signal peak position mark module, position memory are sequentially connected；Wherein,
The data collector be used for receive start sampling instruction after, within 1 sampling period with sample frequency F with
Sampling duration t2 acquisition obtains the data of current sample period backwards to pulsed optical signals, and the pulsed optical signals backwards are preceding to arteries and veins
Pulsed light signal passes through the pulsed optical signals that fiber switch sensing node back reflection to be detected generates, and the data collector is also used to
Current sample period data are sent to the denoising module；
The denoising module includes smoother, buffer, and smoother is connected with buffer；
The pulse signal peak position mark module is used for the section position of the pulse signal or the pulse
Position memory is arrived as the addition storage of fiber switch sensing node position in the midpoint of signal spacing position；
The position memory is for storing fiber switch sensing node position.
In one embodiment of the present of invention, it is described start sampling instruction be simultaneously emitted by with the forward pulse optical signal, institute
It states to start to sample to instruct and be periodically sent out with sampling interval t1, the forward pulse optical signal is that light source issues and without any anti-
The pulsed optical signals penetrated, the pulsewidth of the forward pulse optical signal signal are w, and the sampling duration t2 is greater than from 1 forward direction arteries and veins
Pulsed light signal is issued to the duration for receiving the last one between pulsed optical signals, and the value of the sampling interval t1 is greater than or waits
In the value of the sampling duration t2, the sample frequency F and the pulsewidth w are preset value；
The smoother is used to carry out the data of the current sample period noise suppressed, the smoother be also used to by
The data of current sample period after the noise suppressed are stored into buffer, and judge in buffer storing data
Sampling period number whether be greater than or equal to C, be separated by C with current sample period if more than or equal to then taking out in buffer
The sampling period data in sampling period, and by the data of the current sample period after the noise suppressed and it is described with it is current
The sampling period data that sampling period is separated by C sampling period are sent to the pulse signal peak position mark module, if being less than
Then cancel the processing of current period sampled data, the C is preset value；
The buffer is for the current sample period described in the policy store according to first in first out after noise suppressed
Data, the buffer can store the sampled data more than or equal to C sampling period；
The pulse signal peak position mark module includes pulse high level recognition unit, and the pulse high level is known
Other unit is used to press down with described by noise using the sampling period data for being separated by C sampling period with current sample period
The data of current sample period after system successively seek relative variation operation to the data of corresponding serial number, and record the phase
The serial number of the sampled data of threshold value T is greater than to variable quantity and using these serial numbers as the section position of pulse signal.
In one embodiment of the present of invention, the sampling interval t1 of the data collector is less than or equal to 250 milliseconds；It is described
The value of C is integer value, and the value of the C is greater than 500 milliseconds of quotient divided by sampling interval t1, and it is more than sensing that buffer, which can store,
Node state changes multiple periodic sampling data of required duration, and the data stored in buffer are enough to determine fiber cable cross connection box
Sensing node state change caused by enabling or shutdown act.
In one embodiment of the present of invention, it is described seek relative variation operation for by it is described it is smoothed after present sample
Cycle data and the sampling period data for being separated by C sampling period are successively divided by by serial number in the period seeks quotient, and will
Relative variation of the quotient as corresponding ordinal position；The value range of the threshold value T meets with lower inequality: 1.1≤T
≤ 3, it is contemplated that there is different signal energy intensity and noise energy backwards to pulsed light what different sensing nodes was reflected back
Intensity is more conducive to stablize relative variation compared to difference operation, in threshold in seeking relative variation using division arithmetic
Comparison result is more accurate when value compares.
In one embodiment of the present of invention, the noise suppressing method is average filter or middle position value filtering, Huo Zheyi
Rank hysteresis filter perhaps Glitch Filter perhaps limit filtration perhaps Kalman filtering or be following method: the smoother
It is also used to take out the impulse level data in W sampling period of Window width from the buffer, by current period sampled point
Data and the impulse level data in W period carry out the mean value computation of corresponding serial number and using mean value computation results as after smooth
Sample point data, wherein the value range of the Window width W meets with lower inequality: 2≤W≤C, the mean value
Being calculated as arithmetic average, perhaps perhaps harmonic average is perhaps weighted and averaged perhaps square mean to geometric average or index is flat
Or median is average.
In one embodiment of the present of invention, the pulse signal peak position mark module also includes a pulse width filter list
Member, the pulse width filter unit are connected with pulse high level identification module, and the pulse width filter unit is for deleting the pulse
Pulse signal section position of the length of the section position of signal less than L records, wherein the calculation method of the L are as follows: the arteries and veins
Wide w multiplied by the product of the sample frequency F downward rounding；Due to forward pulse light by each sensing node reflection after generate it is more
A pulsewidth w backwards to pulsed light will not be narrowed because of the influence of optical path or circuit, and the pulsewidth backwards to pulsed optical signals remains as w
Or it is slightly larger than w, so pulse signal of the pulsewidth less than w is made an uproar not instead of backwards to pulsed optical signals by what optical path or circuit generated
The pulsed optical signals for being less than the pulsewidth of forward pulse light are filtered out in this example, are mentioned to further filter out noise by acoustical signal
The high recognition accuracy backwards to pulsed light.
In one embodiment of the present of invention, the pulse signal peak position mark module also includes pulse signal high level
Interval midpoint computing unit, the pulse signal high level interval midpoint computing unit are connected with pulse width filter unit, the arteries and veins
Signal high level interval midpoint computing unit is rushed to be used for the start sequence number of the section position of the pulse signal and terminate serial number
It carries out mean value computation and acquires mean value, then rounding operation is carried out to the mean value and acquires round numbers mean value as the pulse signal height
The midpoint in level section, wherein the mean value computation is arithmetic average perhaps geometric average perhaps harmonic average or weighting
Perhaps exponential average or median are average for average perhaps square mean, and the rounding operation is to round up, or downwards
It is rounded, or rounds up；The midpoint of pulse signal is typically in the high level section of pulse signal, the energy value of midpoint
The as energy peak of pulse, dexterously using the midpoint of pulse signal high level section position as sensing node in this example
Position so that sensing node condition sensing variation detection judgement can be completed with single sampled point, more simply.
In one embodiment of the present of invention, the value of the sampling duration t2 of the data collector also meets with lower inequality:
0.05ms≤t2≤1ms；Sampling duration, which is greater than or equal to 0.05ms, can meet round-trip demand of the pulsed light in 5km optical path,
And pulsed light round-trip required time in 100 kilometers of optical path is about 1ms, the optical path greater than 100 kilometers, pulsed light can energy loss
Totally, sampling duration longer than 1ms may bring largely meaningless sampled datas and system load to consumption, this example make be
The maximum optical path distance that can be supported unite in 5km to 100km.
In one embodiment of the present of invention, the value of the pulsewidth w of the forward pulse width is less than or equal to 3 microseconds, described
The sample frequency F of data collector is greater than or equal to 2 times of 1 second quotient divided by pulsewidth w；In ordinary optic fibre, (material is quartzy glass
Glass) in, photon is to be propagated in the form of total reflection, therefore the propagation of one end to the other end will appear delay, and speed can reduce,
About 2/3rds of vacuum light speed, about 200000KM/S, pulsewidth, which is greater than 3 microseconds, may cause two that spacing is less than 300m
Two of sensing node reflection generate the overlapping of signal backwards to pulsed light, so that the present invention is difficult to differentiate between the back of different sensing nodes
To the position in the high level section in time-domain signal of pulsed optical signals, pulsewidth can make the sensing of system less than 3 microseconds
Node minimum spacing reaches 300m, meets the demand of the practical spacing of most optical cross boxes in application.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
(1) present invention in, it is contemplated that at coupling it is bad it is reflective will not because of sensing node sensing amount variation and change,
The sample point data in multiple periods is acquired by data collector, and by pulse signal peak position mark module using wherein
The sample point data of two Different sampling periods detects position of the pulsed optical signals of sensing node reflection within the period, effectively
The case where abnormal reflection pulsed optical signals of fiber coupling point in optical path are judged as sensing node position is eliminated, back is improved
To the accuracy of pulsed light pipeline switch sensing node location position.
(2) present invention is provided with denoising module to inhibit the various noises in the pulsed light sampled signal simultaneously,
The mean value that sampled signal has been sought before progress pulse signal peak position identification, improves the signal-to-noise ratio of signal entirety, so that passing
The judgement for feeling Node Switch state is more accurate.
(3) present invention is provided with arteries and veins to further remove periodic noise also in pulse signal peak markers module
Wide filter element is less than the pulse signal section position of L using the length that this element deletes the section position of the pulse signal
Record further improves sensing so that pulse signal of the pulsewidth less than L is all identified as noise by pulse width filter unit and removes
The accuracy that Node Switch state determines.
(4) in ordinary optic fibre (material is quartz glass), photon is to be propagated in the form of total reflection, therefore one end is arrived
The propagation of the other end will appear delay, and speed can reduce, about 2/3rds of vacuum light speed, about 200000KM/S.In electricity
In the all-optical network for believing operator, perimeter fiber optics can exceed that 5km, and the data collector of this patent will be in the single sampling period
It samples duration to be arranged between 0.05ms to 1ms, abundance guarantees pulsed light in round-trip need in 5km to 100km optical path length
It wants, the maximum optical path distance that system is supported is in 5km to 100km.
(5) value of the pulsewidth w for the forward pulse light that this patent uses is less than or equal to 3 microseconds, and two can be made to be greater than
Or the sensing node equal to 300m be reflected back do not occur the overlapping of signal backwards to pulsed light, sensing node minimum spacing can be with
Reach 300m.
Detailed description of the invention
Fig. 1 is the structural representation in the embodiment of the present invention backwards to pulsed light fiber switch sensing node sequence detecting apparatus
Figure；
Fig. 2 is to illustrate in the embodiment of the present invention backwards to the process of pulsed light fiber switch sensing node sequence detecting method
Figure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The detection device of existing pulse signal peak position is typically provided with absolute threshold comparison module directly in pulse
The single or continuous position for exceeding energy threshold is searched in time-domain sampling signal.This device is difficult to distinguish in sample point data
Because of the reflected impulse light for the bad generation that is of coupled connections and the regular reflection pulsed light of sensing node at fiber coupling.Simultaneously backwards to arteries and veins
Pulsed light signal may be more difficult to quasi- in the data that periodic cycle samples by the noise jamming from optical path or circuit
Determine the pulse signal section position of each sensing node reflection in position.
Therefore the present invention provides a kind of backwards to pulsed light fiber switch sensing node sequence detecting apparatus, and Fig. 1 is this hair
Backwards to the structural schematic diagram of pulsed light fiber switch sensing node sequence detecting apparatus in bright embodiment, as seen from the figure, the present invention
Detection device structure is sequentially connected by data collector, denoising module, pulse signal peak position mark module, position memory
At.
Wherein, data collector be used for receive start sampling instruction after, with sample frequency F within 1 sampling period
The data of current sample period are obtained backwards to pulsed optical signals with sampling duration t2 acquisition, specifically, sampling duration t2 is greater than from 1
A forward pulse optical signal is issued to the duration for receiving the last one between pulsed optical signals, and the value for sampling duration t2 is also full
Be enough lower inequality: the value of 0.05ms≤t2≤1ms, sampling interval t1 are greater than or equal to the value of sampling duration t2, sample frequency F
It is preset value with pulsewidth w；The sampling interval t1 of data collector is less than or equal to 250 milliseconds；The sample frequency F of data collector
More than or equal to 2 times of 1 second quotient divided by pulsewidth w, more specifically, sample frequency F is 1Mhz, and sampling duration t2 is 1ms, backwards
Pulsed optical signals are the pulsed optical signals that forward pulse optical signal passes through that fiber switch sensing node back reflection to be detected generates, number
It is also used to the data of current sample period being sent to denoising module according to collector, specifically, starting sampling instruction and forward pulse
Optical signal is simultaneously emitted by, start sampling instruction be periodically sent out with sampling interval t1, forward pulse optical signal be light source issue and
Pulsed optical signals without any reflection, the pulsewidth of forward pulse optical signal signal are w, the value of the pulsewidth w of forward pulse width
Less than or equal to 3 microseconds, more specifically, sampling interval duration 2ms, pulsewidth is 2.5 microseconds.
Wherein, denoising module includes smoother, buffer, and smoother is connected with buffer；
Smoother is used to carry out noise suppressed to the data of current sample period, and smoother takes out smooth window from buffer
The impulse level data in W sampling period of width, smoother is again by current period sample point data and the pulse electricity in W period
Flat data carry out the mean value computation of corresponding serial number and using mean value computation results as smoothed out sample point data, smoothing windows mouth width
The value range for spending W meets with lower inequality: 2≤W≤C, and mean value computation is arithmetic average perhaps geometric average or reconciliation
Average, being perhaps weighted and averaged perhaps square mean, perhaps exponential average or median are average, and more specifically, the value of W is
100, mean value computation is arithmetic average；Smoother is also used to arrive the data storage of the current sample period after noise suppressed
In buffer, and judge whether the sampling period number of storing data in buffer is greater than or equal to C, if more than or equal to then
The sampling period data for being separated by C sampling period in buffer with current sample period are taken out, and will be after noise suppressed
The data of current sample period and the sampling period data for being separated by C sampling period with current sample period are sent to pulse signal peak
It is worth position mark module, cancels the processing of current period sampled data if being less than, C is preset value；The value of C is integer value, and C
Value be greater than 500 milliseconds of quotient divided by sampling interval t1, more specifically, the value of C is 500.
Buffer is used for the data of the current sample period according to the policy store of first in first out after noise suppressed, tool
Body, buffer can store the sampled data more than or equal to C sampling period, and more specifically, the value of C is 500.
Wherein, pulse signal peak position mark module includes pulse high level recognition unit, pulse width filter unit, arteries and veins
Signal high level interval midpoint computing unit is rushed, pulse signal peak position mark module is used for the section position of pulse signal
Or position memory is arrived as the addition storage of fiber switch sensing node position in the midpoint of pulse signal section position, position is deposited
Reservoir is for storing fiber switch sensing node position, more specifically, if the position of fiber switch sensing node is in place
Set in memory and exist, then do not store the location information, if the position of fiber switch sensing node in position memory not
In the presence of, then add store the location information.
Pulse high level recognition unit is used to utilize the sampling period data for being separated by C sampling period with current sample period
Relative variation operation successively is sought to the data of corresponding serial number with the data of the current sample period after noise suppressed,
And record the serial number of sampled data of the relative variation greater than threshold value T and using these serial numbers as the section position of pulse signal,
Seek relative variation operation for after will be smoothed current sample period data and the sampling period number that is separated by C sampling period
Quotient is sought according to being successively divided by by serial number in the period, and using quotient as the relative variation of corresponding ordinal position；Threshold value T's takes
Be worth range to meet with lower inequality: 1.1≤T≤3, more specifically, the value of threshold value T are 1.1.
Pulse width filter unit is connected with pulse high level identification module, and pulse width filter unit is used to delete the area of pulse signal
Between position length less than L pulse signal section position record, specifically, the calculation method of L are as follows: pulsewidth w multiplied by sampling frequency
The downward rounding of the product of rate F, more specifically, the pulsewidth w of forward pulse light is 2.5ms in present embodiment, data collector
Sample frequency is 1Mhz, can calculate L value be 2.
Pulse signal high level interval midpoint computing unit is connected with pulse width filter unit, in pulse signal high level section
Point computing unit is by the start sequence number of the section position of pulse signal and terminates serial number and carries out arithmetic equal value calculating to acquire arithmetic equal
Value, then downward rounding operation is carried out to arithmetic equal value and acquires midpoint of the round numbers mean value as pulse signal high level section.
Position memory is for storing fiber switch sensing node position.
Fig. 2 is used in pulsed light fiber switch sensing node sequence detecting apparatus in the embodiment of the present invention backwards to arteries and veins
Wash the flow diagram of fiber switch sensing node sequence detecting method off, as seen from the figure, apparatus of the present invention are carried out backwards to pulse
Light fiber switch sensing node sequence detecting method includes the following steps:
S1: being simultaneously emitted by and start sampling instruction and forward pulse optical signal, specifically, starting sampling instruction with the sampling interval
T1 is periodically sent out, and forward pulse optical signal is that light source issues and the pulsed optical signals without any reflection, forward pulse light are believed
Number pulsewidth be w, sampling interval t1 is less than or equal to 250 milliseconds, and it is micro- that the value of the pulsewidth w of forward pulse width is less than or equal to 3
Second, more specifically, sampling interval duration 2ms, pulsewidth is 2.5 microseconds.
S2: receive start sampling instruction after, within a sampling period with sample frequency F and sampling duration t2 acquisition
The data of current sample period are obtained backwards to pulsed optical signals, are forward pulse optical signal by be detected backwards to pulsed optical signals
The pulsed optical signals that fiber switch sensing node back reflection generates, specifically, sampling duration t2 is greater than from a forward pulse light
Signal is issued to the duration for receiving the last one between pulsed optical signals, when the value of sampling interval t1 is greater than or equal to sampling
The value of the value of long t2, sampling duration t2 also meets with lower inequality: 0.05ms≤t2≤1ms, the sample frequency F of data collector
More than or equal to 2 times of 1 second quotient divided by pulsewidth w, more specifically, sample frequency F is 1Mhz, and sampling duration t2 is 1ms.
S3: noise suppressed is carried out to the data of current sample period, specifically, smoother takes out smooth window from buffer
The impulse level data in W sampling period of width, smoother is again by current period sample point data and the pulse electricity in W period
Flat data carry out the mean value computation of corresponding serial number and using mean value computation results as smoothed out sample point data, smoothing windows mouth width
The value range for spending W meets with lower inequality: 2≤W≤C, and mean value computation is arithmetic average perhaps geometric average or reconciliation
Average, being perhaps weighted and averaged perhaps square mean, perhaps exponential average or median are average, and more specifically, the value of W is
100, mean value computation is arithmetic average.
S4: the data of the current sample period after noise suppressed are stored into buffer, and are judged in buffer
Whether the sampling period number of storing data is greater than or equal to C, if more than or equal to then go to step S5, goes to step if being less than
S1, specifically, buffer is used for the data of the current sample period according to the policy store of first in first out after noise suppressed,
Buffer can store the sampled data more than or equal to C sampling period, and the value of C is integer value, and the value of C is greater than 500 millis
Second, more specifically, the value of C was 500 divided by the quotient of sampling interval t1.
S5: taking out the sampling period data for being separated by C sampling period in buffer with current sample period, specifically, by
Smoother takes out the sampling period data for being separated by C sampling period with current sample period from buffer, more specifically,
The value of C is 500.
S6: it is pressed using the data of the step S5 sampling period data taken out and the current sample period after noise suppressed
Data sequence number seeks relative variation in period, specifically, by pulse high level recognition unit will be smoothed after present sample
Period and the sample point data for the sampling period same sequence number position for being separated by C sampling period with current sample period are successively divided by
Quotient is sought, and using quotient as the relative variation of corresponding ordinal position；
S7: record relative variation is greater than the serial number of the sampled data of threshold value T and using these serial number as pulse signal
Section position, specifically, by pulse high level recognition unit using be more than in relative variation data threshold value T continuum as
The high level section of pulse signal, and record initial position and the end position in these sections, the value range of threshold value T meet with
Lower inequality: 1.1≤T≤3, more specifically, the value of threshold value T are 1.1.
S8: pulse signal section position of the length less than L for deleting the section position of pulse signal records, specifically, sharp
With the section position length of pulse width filter unit comparison pulse signal and the size of L, and deletes and be less than pulse of the length less than L and believe
Number section position record, the calculation method of L are as follows: pulsewidth w multiplied by the product of sample frequency F downward rounding, more specifically, this implementation
The pulsewidth w of forward pulse light is 2.5ms in mode, and the sample frequency of data collector is 1Mhz, can calculate the value of L is 2.
S9: using the midpoint of the section position of pulse signal or pulse signal section position as fiber switch sensing node
Position memory is arrived in position addition storage, specifically, pulse signal high level interval midpoint computing unit is by the area of pulse signal
Between position start sequence number and terminate serial number and carry out arithmetic equal value calculating to acquire arithmetic equal value, then arithmetic equal value is taken downwards
Whole operation acquires midpoint of the round numbers mean value as pulse signal high level section, and by the midpoint in pulse signal high level section
Position memory is arrived as the addition storage of fiber switch sensing node position, position memory is for storing fiber switch sensing section
Point position more specifically if the position of fiber switch sensing node exists in position memory, does not store the position
Confidence breath adds if the position of fiber switch sensing node is not present in position memory and stores the location information.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (8)
1. backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that data collector, denoising module,
Pulse signal peak position mark module, position memory are sequentially connected；Wherein,
The data collector be used for receive start sampling instruction after, within 1 sampling period with sample frequency F and sampling
Duration t2 acquisition obtains the data of current sample period backwards to pulsed optical signals, and the pulsed optical signals backwards are forward pulse light
Signal passes through the pulsed optical signals that fiber switch sensing node back reflection to be detected generates, and the data collector is also used to work as
The data in preceding sampling period are sent to the denoising module；
The denoising module includes smoother, buffer, and smoother is connected with buffer；
The pulse signal peak position mark module is used for the section position of the pulse signal or the pulse signal
Position memory is arrived as the addition storage of fiber switch sensing node position in the midpoint of section position；
The position memory is for storing fiber switch sensing node position；
It is described start sampling instruction be simultaneously emitted by with the forward pulse optical signal, it is described start sampling instruct with sampling interval t1
It is periodically sent out, the forward pulse optical signal is light source sending and the pulsed optical signals without any reflection, the forward direction arteries and veins
The pulsewidth of pulsed light signal signal is w, and the sampling duration t2, which is greater than to be issued to from 1 forward pulse optical signal, receives the last one
Duration between pulsed optical signals, the value of the sampling interval t1 is greater than or equal to the value of the sampling duration t2, described
The sample frequency F and pulsewidth w is preset value；
The smoother is used to carry out noise suppressed to the data of the current sample period, and the smoother is also used to pass through
The data of current sample period after the noise suppressed are stored into buffer, and judge in buffer adopting for storing data
Whether sample number of cycles is greater than or equal to C, C sampling is separated by buffer with current sample period if more than or equal to then taking out
The sampling period data in period, and by the data of the current sample period after the noise suppressed and described and present sample
The sampling period data that period is separated by C sampling period are sent to the pulse signal peak position mark module, take if being less than
The processing for the current period sampled data that disappears, the C are preset value；
Number of the buffer for the current sample period described in the policy store according to first in first out after noise suppressed
According to the buffer can store the sampled data more than or equal to C sampling period；
The pulse signal peak position mark module includes pulse high level recognition unit, and the pulse high level identification is single
Member for using the sampling period data for being separated by C sampling period with current sample period with it is described after noise suppressed
The data of current sample period relative variation operation successively is sought to the data of corresponding serial number, and record described opposite become
Change amount is greater than the serial number of the sampled data of threshold value T and using these serial number as the section position of pulse signal.
2. as described in claim 1 backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that
The sampling interval t1 of the data collector is less than or equal to 250 milliseconds；
The value of the C is integer value, and the value of the C is greater than 500 milliseconds of quotient divided by sampling interval t1.
3. as claimed in claim 2 backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that described
Seek relative variation operation for by it is described it is smoothed after current sample period data be separated by adopting for C sampling period with described
Sample cycle data is successively divided by by serial number in the period seeks quotient, and using the quotient as the opposite variation of corresponding ordinal position
Amount；
The value range of the threshold value T meets with lower inequality:
1.1≤T≤3。
4. as claimed in claim 3 backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that described
Noise suppressing method is that perhaps perhaps first-order lag filters perhaps Glitch Filter or clipping to middle position value filtering to average filter
Filtering perhaps Kalman filtering or be following method:
The smoother is also used to take out the impulse level data in W sampling period of Window width from the buffer, will
Current period sample point data and the impulse level data in W period carry out the mean value computation of corresponding serial number and by mean value computations
As a result it is used as smoothed out sample point data, wherein the value range of the Window width W meets with lower inequality: 2≤
W≤C, the mean value computation are that perhaps perhaps harmonic average is perhaps weighted and averaged or square flat geometric average arithmetic average
Perhaps exponential average or median are average.
5. as claimed in claim 4 backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that described
Pulse signal peak position mark module also includes a pulse width filter unit, and the pulse width filter unit and pulse high level are known
Other module is connected, and pulse of the length less than L that the pulse width filter unit is used to delete the section position of the pulse signal is believed
Number section position record, wherein the calculation method of the L are as follows: the pulsewidth w downwards takes multiplied by the product of the sample frequency F
It is whole.
6. as claimed in claim 5 backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that described
Pulse signal peak position mark module also includes pulse signal high level interval midpoint computing unit,
The pulse signal high level interval midpoint computing unit is connected with the pulse width filter unit, the high electricity of the pulse signal
Flat interval midpoint computing unit is by carrying out the start sequence number of the section position of the pulse signal and end serial number based on mean value
Calculation acquires mean value, then carries out rounding operation to the mean value and acquire round numbers mean value as pulse signal high level section
Midpoint, wherein
The mean value computation is that perhaps perhaps harmonic average is perhaps weighted and averaged or square flat geometric average arithmetic average
Perhaps exponential average or median are average, and the rounding operation is to round up, and are perhaps rounded downwards or take upwards
It is whole.
7. as described in claim 1 backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that described
The value of the sampling duration t2 of data collector also meets with lower inequality:
0.05ms≤t2≤1ms。
8. as described in claim 1 backwards to pulsed light fiber switch sensing node sequence detecting apparatus, which is characterized in that
The value of the pulsewidth w of the forward pulse width is less than or equal to 3 microseconds,
The sample frequency F of the data collector is greater than or equal to 2 times of 1 second quotient divided by pulsewidth w.
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| US9304017B2 (en) * | 2010-11-11 | 2016-04-05 | Fotech Solutions Limited | Distributed optical fibre sensor |
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