CN107687938B - Backwards to pulsed light fiber switch sensing node sequence detecting method - Google Patents
Backwards to pulsed light fiber switch sensing node sequence detecting method Download PDFInfo
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- CN107687938B CN107687938B CN201710698362.6A CN201710698362A CN107687938B CN 107687938 B CN107687938 B CN 107687938B CN 201710698362 A CN201710698362 A CN 201710698362A CN 107687938 B CN107687938 B CN 107687938B
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
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Abstract
The invention discloses backwards to pulsed light fiber switch sensing node sequence detecting method, by the sample point data for acquiring multiple periods, position of the pulsed optical signals of sensing node reflection within the period is detected using the sample point data of two Different sampling periods, the mean value of sampled signal has been sought before carrying out the identification of pulse signal peak position, pulse signal section position of the length less than L for deleting the section position of pulse signal records, to effectively eliminate the case where abnormal reflection pulsed optical signals of fiber coupling point in optical path are judged as sensing node position, improve the accuracy backwards to pulsed light pipeline switch sensing node location position.The present invention provides the solution of the accurate timing information backwards to pulsed light for pulsed light fiber switch sensing and detecting system backwards.
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 method.
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.
Need to obtain sensing node in sensing network backwards to pulsed light fiber switch sensing node switch state detection method
Order, number and its peak value of pulse sample data sequence during the sampling period position, thus according to backwards to pulsed light and
Its pulsed light peak strength, timing and time slot are according to the accurate predicate node switch state of sequence node.Pulse signal peak position
Determination, generally directly in pulse temporal sampled signal search exceed energy threshold single or continuous position.This method
It is difficult to distinguish in sample point data at fiber coupling because of the reflected impulse light and sensing node of the bad generation that is of coupled connections just
Abnormal reflections pulsed light.It in addition may be by the noise jamming from optical path or circuit backwards to pulsed optical signals.
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 includes the following steps:
S1: being simultaneously emitted by and start sampling instruction and forward pulse optical signal, described to start sampling instruction 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 is w, wherein the t1 and w is preset value；
S2: receive start sampling instruction after, within a sampling period with sample frequency F and sampling duration t2 acquisition
Obtain the data of current sample period backwards to pulsed optical signals, it is described backwards to pulsed optical signals be forward pulse optical signal by
The pulsed optical signals that detection fiber switch sensing node back reflection generates, wherein the sampling duration t2 is greater than from a forward direction
Pulsed optical signals are issued to the duration for receiving the last one between pulsed optical signals, the value of the sampling interval t1 be greater than or
Equal to the value of the sampling duration t2, the sample frequency F is preset value；
S3: noise suppressed is carried out to the data of the current sample period；
S4: the data of the current sample period after the noise suppressed are stored into buffer, and judge to cache
Whether the sampling period number of storing data is greater than or equal to C in device, if more than or equal to then go to step S5, turns if being less than
Step S1, wherein the buffer is for the present sample described in the policy store according to first in first out after noise suppressed
The data in period, the buffer can store the sampled data more than or equal to C sampling period, and the C is preset value；
S5: the sampling period data for being separated by the C sampling period in buffer with current sample period are taken out；
S6: the number of the step S5 sampling period data taken out and the current sample period after noise suppressed is utilized
Relative variation is sought according to the data successively to corresponding serial number；
S7: recording the serial number of sampled data of the relative variation greater than threshold value T and believes these serial numbers as pulse
Number section position；
S9: using the midpoint of the section position of the pulse signal or pulse signal section position as fiber switch
Position memory is arrived in the addition storage of sensing node position, wherein the position memory is for storing fiber switch sensing node
Position.
In one embodiment of the present of invention, the sampling interval t1 is less than or equal to 250 milliseconds, and 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；Enabling or the shutdown movement of fiber cable cross connection box continue
Time is generally less than 500 milliseconds, and when the value of C is greater than 500 milliseconds of quotient divided by sampling interval t1, it is more than to pass that buffer, which can store,
Feel multiple periodic sampling data of duration needed for node state changes, the data stored in buffer are enough to determine fiber cable cross connection box
Enabling or shutdown act caused by sensing node state change.
In one embodiment of the present of invention, it is described seek relative variation be by it is described it is smoothed after current sample period
The sampling period data that data and the step S5 take out successively are divided by by serial number in the period seeks quotient, and using quotient as pair
Answer the relative variation of ordinal position；In step S7, the value range of the threshold value T meets with lower inequality: 1.1≤T≤3,
In view of what is be reflected back in different sensing nodes has different signal energy intensity and noise energy intensity backwards to pulsed light,
It is more conducive to stablize relative variation compared to difference operation using division arithmetic in seeking relative variation, be compared in threshold value
When comparison result it is more accurate.
In one embodiment of the present of invention, in step S3, the noise suppressing method is that average filter or median are filtered
Wave perhaps first-order lag filtering perhaps Glitch Filter perhaps limit filtration perhaps Kalman filtering or be following method:
The impulse level data in W sampling period of Window width are taken out from the buffer, then by current period sample point data
The mean value computation of corresponding serial number is carried out with the impulse level data in W period and is adopted using mean value computation result as smoothed out
Sampling point data；Wherein, the value range of the Window width W meets with lower inequality: 2≤W≤C；The mean value computation
For arithmetic average, perhaps perhaps harmonic average is perhaps weighted and averaged perhaps square mean or exponential average to geometric average,
Or median is average.
Also include step S8 between step S7 and step S9 in one embodiment of the present of invention: deleting the pulse letter
Number section position length less than L pulse signal section position record, wherein the calculation method of the L are as follows: the pulsewidth
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 multiple
Backwards to pulsed light pulsewidth w all will not because of the influence of optical path or circuit narrow, backwards to the pulsewidth of pulsed optical signals remain as w or
Slightly larger than w, so pulsewidth is less than the pulse signal of w not instead of backwards to pulsed optical signals, by optical path or the noise of circuit generation
The pulsed optical signals for being less than the pulsewidth of forward pulse light are filtered out in this example, are improved to further filter out noise by signal
Backwards to the recognition accuracy of pulsed light.
In one embodiment of the present of invention, in step S9, the calculating at the midpoint of pulse signal high level section position
Method acquires mean value for the start sequence number of the section position of the pulse signal and end serial number are carried out mean value computation, then to institute
It states mean value progress rounding operation and acquires midpoint of the round numbers mean value as pulse signal high level section, the mean value computation
For arithmetic average, perhaps perhaps harmonic average is perhaps weighted and averaged perhaps square mean or exponential average to geometric average,
Or median is average, the rounding operation is to round up, and is perhaps rounded or rounds up downwards；In pulse signal
Point is typically in the high level section of pulse signal, and the energy value of midpoint is the energy peak of pulse, skilful in this example
Wonderfully using the midpoint of pulse signal high level section position as the position of sensing node, so that sensing node condition sensing becomes
Judgement can be completed with single sampled point in the detection of change, more simply.
In one embodiment of the present of invention, the value of the sampling duration t2 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 is 100
The round-trip required time is about 1ms in the optical path of kilometer, and the optical path greater than 100 kilometers, pulsed light may be lost totally, compare 1ms
Longer sampling duration may bring a large amount of meaningless sampled datas and system load, this example that system is supported
Maximum optical path distance is 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,
Sensing node is detected by acquiring the sample point data in multiple periods, and using the sample point data of two Different sampling periods
Position of the pulsed optical signals of reflection within the period effectively eliminates the abnormal reflection pulsed optical signals of fiber coupling point in optical path
The case where being judged as sensing node position improves the accuracy backwards to pulsed light pipeline switch sensing node location position.
(2) present invention is carrying out pulse signal peak to inhibit the various noises in pulsed light sampled signal simultaneously
The mean value that sampled signal has been sought before the identification of value position, improves the signal-to-noise ratio of signal entirety, so that sensing node switch state
Judgement it is more accurate.
(3) present invention also deletes the length of the section position of the pulse signal to further remove periodic noise
Pulse signal section position record less than L, so that pulse signal of the pulsewidth less than L is all identified as noise and removes, into one
Step improves the accuracy of sensing node switch state judgement.
(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, this patent control the sampling duration in the single sampling period
Between 0.05ms to 1ms, abundance guarantees pulsed light in round-trip needs in 5km to 100km optical path length, so that system can
With the maximum optical path distance of support 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 to illustrate in the embodiment of the present invention backwards to the process of pulsed light fiber switch sensing node sequence detecting method
Figure；
Fig. 2 is the structural representation in the embodiment of the present invention backwards to pulsed light fiber switch sensing node sequence detecting apparatus
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 method of existing pulse signal peak position, generally directly searches in pulse temporal sampled signal and exceeds
The single or continuous position of energy threshold.This method is difficult to distinguish at fiber coupling in sample point data because being of coupled connections not
The reflected impulse light of good generation and the regular reflection pulsed light of sensing node.Simultaneously backwards to pulsed optical signals may by from
The noise jamming of optical path or circuit is more difficult to that each sensing node reflection is accurately positioned in the data that periodic cycle samples
Pulse signal section position.
Therefore the present invention provides a kind of backwards to pulsed light fiber switch sensing node sequence detecting method, and Fig. 2 is this hair
For being sensed in pulsed light fiber switch sensing node sequence detecting method backwards to pulsed light fiber switch in bright embodiment
The schematic diagram of sequence node structure of the detecting device, as seen from the figure, detection device of the invention by data collector, denoising module,
Pulse signal peak position mark module, position memory are sequentially connected composition.
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.
Pulse signal peak position mark module includes pulse high level recognition unit, pulse width filter unit, pulse letter
Number high level interval midpoint computing unit, pulse signal peak position mark module be used for the section position of pulse signal or
Position memory, position memory are arrived as the addition storage of fiber switch sensing node position in the midpoint of pulse signal section position
For storing fiber switch sensing node position, more specifically, if the position of fiber switch sensing node is deposited in position
Exist in reservoir, does not then store the location information, if the position of fiber switch sensing node is not present in position memory,
It then adds and stores 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. 1 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, as seen from the figure, the present invention include the following steps: backwards to pulsed light fiber switch sensing node sequence detecting method
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 method, which is characterized in that it includes the following steps:
S1: being simultaneously emitted by and start sampling instruction and forward pulse optical signal, described to start sampling instruction with the period in sampling interval t1
Property issue, the forward pulse optical signal be light source issue and the pulsed optical signals without any reflection, the forward pulse light
The pulsewidth of signal is w, wherein the t1 and w is preset value；
S2: receive start sampling instruction after, within a sampling period with sample frequency F and sampling duration t2 acquisition backwards
Pulsed optical signals obtain the data of current sample period, and the pulsed optical signals backwards pass through to be detected for forward pulse optical signal
The pulsed optical signals that fiber switch sensing node back reflection generates, wherein the sampling duration t2 is greater than from a forward pulse
Optical 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 equal to
The value of the sampling duration t2, the sample frequency F are preset value；
S3: noise suppressed is carried out to the data of the current sample period；
S4: the data of the current sample period after the 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, wherein 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, and the C is preset value；
S5: the sampling period data for being separated by the C sampling period in buffer with current sample period are taken out；
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；
S7: the serial number of sampled data of the relative variation greater than threshold value T is recorded and using these serial numbers as pulse signal
Section position；
S8: it is sensed the midpoint of the section position of the pulse signal or pulse signal section position as fiber switch
Position memory is arrived in node location addition storage, wherein the position memory is for storing fiber switch sensing node position.
2. as described in claim 1 backwards to pulsed light fiber switch sensing node sequence detecting method, which is characterized in that
In step S1, the sampling interval t1 is less than or equal to 250 milliseconds,
In step S4, 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 method, which is characterized in that
In step S6, it is described seek relative variation be will be smoothed after current sample period data and the step S5 take out
Sampling period data be successively divided by by serial number in the period and seek quotient, and using the quotient as the opposite of corresponding ordinal position
Variable quantity；
In step S7, 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 method, which is characterized in that step
In S3, the noise suppressing method be average filter perhaps middle position value filtering perhaps first-order lag filtering or Glitch Filter,
Perhaps limit filtration perhaps Kalman filtering or be following method:
The impulse level data in W sampling period of Window width are taken out from the buffer, then 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 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.
5. as claimed in claim 4 backwards to pulsed light fiber switch sensing node sequence detecting method, which is characterized in that step
Between S7 and step S8, further includes: the length for deleting the section position of the pulse signal is less than the pulse signal section position of L
Record, wherein the calculation method of the L are as follows: the pulsewidth w multiplied by the product of the sample frequency F downward rounding.
6. pulsed light fiber switch sensing node sequence detecting method, the feature backwards as described in one of claim 4-5 exist
In in step S8, the calculation method at the midpoint of pulse signal high level section position is by the section of the pulse signal
The start sequence number and end serial number of position carry out mean value computation and acquire mean value, then carry out rounding operation to the mean value and acquire rounding
Midpoint of the number mean value as pulse signal high level section,
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,
The rounding operation is to round up, and is perhaps rounded or rounds up downwards.
7. as described in claim 1 backwards to pulsed light fiber switch sensing node sequence detecting method, which is characterized in that described
The value of sampling duration t2 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 method, which is characterized in that
The value of the pulsewidth w of the forward pulse optical signal is less than or equal to 3 microseconds,
The sample frequency F is greater than or equal to 2 times of 1 second quotient divided by pulsewidth w.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101793599A (en) * | 2010-03-29 | 2010-08-04 | 中国科学院对地观测与数字地球科学中心 | MTF (Modulation Transfer Function) parameter testing method under condition of nonideal target |
| CN102483367A (en) * | 2009-08-28 | 2012-05-30 | 泛达公司 | Methods for calculating multimode fiber system bandwidth and manufacturing improved multimode fiber |
| CN105509778A (en) * | 2015-12-24 | 2016-04-20 | 浙江中电智能科技有限公司 | Remote optical fiber door cover switch monitoring system |
| CN106768862A (en) * | 2016-12-19 | 2017-05-31 | 武汉世纪金桥安全技术有限公司 | One kind reflection blocking type fiber switch sensor |
| CN106959205A (en) * | 2017-04-12 | 2017-07-18 | 武汉世纪金桥安全技术有限公司 | A kind of direct current dorsad light fiber switch detection method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7199869B2 (en) * | 2003-10-29 | 2007-04-03 | Weatherford/Lamb, Inc. | Combined Bragg grating wavelength interrogator and Brillouin backscattering measuring instrument |
-
2017
- 2017-08-15 CN CN201710698362.6A patent/CN107687938B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102483367A (en) * | 2009-08-28 | 2012-05-30 | 泛达公司 | Methods for calculating multimode fiber system bandwidth and manufacturing improved multimode fiber |
| CN101793599A (en) * | 2010-03-29 | 2010-08-04 | 中国科学院对地观测与数字地球科学中心 | MTF (Modulation Transfer Function) parameter testing method under condition of nonideal target |
| CN105509778A (en) * | 2015-12-24 | 2016-04-20 | 浙江中电智能科技有限公司 | Remote optical fiber door cover switch monitoring system |
| CN106768862A (en) * | 2016-12-19 | 2017-05-31 | 武汉世纪金桥安全技术有限公司 | One kind reflection blocking type fiber switch sensor |
| CN106959205A (en) * | 2017-04-12 | 2017-07-18 | 武汉世纪金桥安全技术有限公司 | A kind of direct current dorsad light fiber switch detection method |
Non-Patent Citations (1)
| Title |
|---|
| 无线开关传感网络研究;陈金鹰等;《电子器件》;20090420;430-433 |
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