CN104485992A - Large-dynamic no-blind zone monitoring system and method - Google Patents
Large-dynamic no-blind zone monitoring system and method Download PDFInfo
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- CN104485992A CN104485992A CN201410643116.7A CN201410643116A CN104485992A CN 104485992 A CN104485992 A CN 104485992A CN 201410643116 A CN201410643116 A CN 201410643116A CN 104485992 A CN104485992 A CN 104485992A
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Abstract
The invention relates to a large-dynamic no-blind zone monitoring system and method. The large-dynamic no-blind zone monitoring method includes the following steps that: primary test light is emitted to an optical fiber to be detected with preset pulse width and pulse interval, so that the primary test light can be transmitted in the optical fiber to be detected; the length of the optical fiber to be detected is detected, and the length of the optical fiber can be obtained preliminary; the optical fiber is tested accurately with re-determined pulse width according to the preliminary-obtained length of the optical fiber; and the accurate length of the optical fiber is detected. With large-dynamic no-blind zone monitoring system and method adopted, high optical fiber distance test accuracy can be obtained at any length.
Description
Technical field
The application relates to a kind of state event location system, particularly relates to a kind of Larger Dynamic non-blind area monitoring system and method.
Background technology
In recent years, Fibre Optical Communication Technology obtains to be greatly developed, and optical fiber communication not only achieves remote transmission signal, and the stable performance of signal transmission.In fiber optic monitoring technology, can be launched by Fresnel and optical fiber is monitored.In order to the measurement growing distance can be carried out, general employing test light generally uses larger pulsewidth, but adopt larger pulsewidth to carry out detection and there is following problem, if event location is between larger pulsewidth, the spike then produced by event, can be submerged in noise rapidly, make monitoring accuracy poor.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to provide about the basic comprehension in some of the present invention.Should be appreciated that this general introduction is not summarize about exhaustive of the present invention.It is not that intention determines key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only provide some concept in simplified form, in this, as the preorder in greater detail discussed after a while.
A main purpose of the present invention is to provide a kind of Larger Dynamic non-blind area monitoring system and method.
According to an aspect of the present invention, a kind of Larger Dynamic non-blind area monitoring system, comprising:
Optical time domain detector, for with predetermined pulse width and pulse interval to testing fiber send first test light to transmit in testing fiber, and the reverberation of test light in described testing fiber first described in receiving, and detect the power loss of test light first according to described reverberation;
Distance analysis module, for tentatively determining the event location of described testing fiber according to the power loss of described test light first, described event location is any one in optical fiber end points, breakpoints of optical fiber and optical fiber pad;
Accurate measurement parameter determination module, for determining the dynamic range of test light first, and according to tentatively determining that the event location of optical fiber estimates the dynamic range of second test light testing fiber being carried out to secondary monitoring according to the power loss of described test light first; And
Parameter reset module, for the dynamic range according to test light, relation between pulse duration and pulse interval redefines pulse duration and pulse interval, the pulse duration redefined is less than the pulse duration of test light first, described optical time domain detector is made to send described second test light with the pulse duration redefined and pulse interval and transmit in testing fiber, and receive the reverberation of described second test light in described testing fiber, and the power loss of second test light is detected according to described reverberation, described distance analysis module carries out secondary event location according to the power loss of described second test light to testing fiber.
According to an aspect of the present invention, a kind of Larger Dynamic non-blind area monitoring method, comprising:
With predetermined pulse width and pulse interval to testing fiber send first test light to transmit in testing fiber, and the reverberation of test light in described testing fiber first described in receiving, and detect the power loss of test light first according to described reverberation;
Tentatively determine the event location of described testing fiber according to the power loss of described test light first, described event location is any one in optical fiber end points, breakpoints of optical fiber and optical fiber pad;
The dynamic range of test light is first determined according to the power loss of described test light first, and according to tentatively determining that the event location of optical fiber estimates the dynamic range of second test light testing fiber being carried out to secondary monitoring;
Redefine pulse duration and pulse interval according to the dynamic range of test light, the relation between pulse duration and pulse interval, the pulse duration redefined is less than the pulse duration of test light first;
Send described second test light with the pulse duration redefined and pulse interval and transmit in testing fiber, and receiving the reverberation of described second test light in described testing fiber, to carry out secondary monitoring to testing fiber;
The power loss of second test light is detected according to described reverberation;
Power loss according to described second test light carries out secondary event location to testing fiber.
Larger Dynamic non-blind area monitoring system of the present invention and method carry out secondary monitoring to reach the object of secondary event location to testing fiber, by estimating the dynamic range of second test light, when the secondary obtained according to test light dynamic range and the relation between its pulse pulse width and pulse interval is monitored, the pulse duration of the pulse signal of test light and the time interval all reduce, pulse duration is less, energy is less, resolution is higher, the monitoring blind area produced is also less, pulse interval is less, the error produced is also less, therefore, secondary monitoring is carried out to testing fiber and decreases monitoring blind area and error, improve the precision of state event location, also higher fiber distance measuring accuracy can be obtained under namely can ensureing any length.
Accompanying drawing explanation
Below with reference to the accompanying drawings illustrate embodiments of the invention, above and other objects, features and advantages of the present invention can be understood more easily.Parts in accompanying drawing are just in order to illustrate principle of the present invention.In the accompanying drawings, same or similar technical characteristic or parts will adopt same or similar Reference numeral to represent.
Fig. 1 is the block diagram of Larger Dynamic non-blind area of the present invention monitoring system better embodiment.
Fig. 2 is the flow chart of Larger Dynamic non-blind area of the present invention monitoring method better embodiment.
Embodiment
With reference to the accompanying drawings embodiments of the invention are described.The element described in an accompanying drawing of the present invention or a kind of execution mode and feature can combine with the element shown in one or more other accompanying drawing or execution mode and feature.It should be noted that for purposes of clarity, accompanying drawing and eliminate expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and process in illustrating.
Please refer to Fig. 1, the better embodiment of Larger Dynamic non-blind area of the present invention monitoring system comprises optical time domain detector 1, distance analysis module 2, accurately measurement parameter determination module 3, parameter reset module 4.
Optical time domain detector 1 for launch to testing fiber first test light to transmit tentatively monitor testing fiber in testing fiber, test light is the light pulse signal with predetermined pulse width and pulse interval of fixed qty first, and optical time domain detector 1 sends test light first with this predetermined pulse width and pulse interval to testing fiber.In addition, optical time domain detector 1 also for the reverberation of test light in described testing fiber first described in receiving, and detects the power loss of test light first according to described reverberation.
Distance analysis module 2, for tentatively determining the event location of described testing fiber according to the power loss of described test light first, described event location is any one in optical fiber end points, breakpoints of optical fiber and optical fiber pad.Generally, power loss can be there is in light in a fiber propagation due to scattering, when optical fiber position occurs that fracture, fusion point, termination etc. can cause the discontinuous phenomenon of Signal transmissions, the curve of the power loss of reverberation there will be the anomaly such as angle and curved or spike, by the power loss curve observing test light first, distance analysis module 2 judges whether optical fiber occurs event and occur that the event location corresponding to optical fiber is determined in abnormal position according to the curve of power loss.
Accurate measurement parameter determination module 3, for determining the dynamic range of test light first according to the power loss of described test light first, and according to tentatively determining that the event location of optical fiber estimates the dynamic range dynamic range of second test light testing fiber being carried out to secondary monitoring.Accurate measurement parameter determination module 3 is the dynamic ranges determining test light first according to the curve of the power loss of test light first, and wherein, the dynamic range of test light is the difference of maximum power value and minimal power values first.
Because the dynamic range of test light is larger, range during test light monitoring testing fiber is also larger, and the positioning precision of event location is also lower, and in order to improve positioning precision, Larger Dynamic non-blind area of the present invention monitoring system carries out secondary location to event location.In addition, accurate measurement parameter determination module 3 is according to tentatively determining that the event location of optical fiber estimates the dynamic range of second test light testing fiber being carried out to secondary monitoring, redefine the secondary monitoring distance of testing fiber being carried out to secondary monitoring, and the dynamic range of second test light required when secondary is located is estimated according to secondary monitoring distance, above-mentioned secondary monitoring distance can be the product of distance analysis module 30 determined event location and coefficient when first time monitoring, as, event location is multiplied by 1.2, secondary monitoring distance is less than the range of test light when monitoring for the first time, namely monitoring distance during first time monitoring is less than.
Owing to having following relation between the dynamic range of test light, pulse duration, pulse interval: the dynamic range of test light often reduces by a unit, and pulse interval reduces 4 times, the number of pulses namely sent in the unit interval expands 4 times; The dynamic range of test light often reduces by a unit, and its pulse duration reduces 2 times, and the dynamic range of a unit can be theoretical 1.5dB, also can be the actual value obtained by experiment.Be illustrated with theoretical value 1.5dB, when the dynamic range of test light reduces 4.5dB, when namely reducing by 3 units, pulse interval reduces 43 times, and pulse duration reduces 23 times.
Parameter reset module 4, for redefining pulse duration and pulse interval according to the dynamic range of test light, the relation between pulse duration and pulse interval, the pulse duration redefined is less than the pulse duration of test light first.
Optical time domain detector 1 sends second test light with the pulse duration redefined and pulse interval and transmits in testing fiber, and receive the reverberation of second test light in described testing fiber, and the power loss of second test light is detected according to reverberation, distance analysis module carries out secondary event location according to the power loss of second test light to testing fiber, to upgrade affair alarm information, facilitate the follow-up maintenance, repair to testing fiber.
Please refer to Fig. 2, the better embodiment of Larger Dynamic non-blind area of the present invention monitoring method comprises the following steps:
Step S1: with predetermined pulse width and pulse interval to testing fiber send first test light to transmit in testing fiber, and the reverberation of test light in described testing fiber first described in receiving, and detect the power loss of test light first according to described reverberation.
Step S2: the event location tentatively determining described testing fiber according to the power loss of described test light first, described event location is any one in optical fiber end points, breakpoints of optical fiber and optical fiber pad.
Step S3: the dynamic range determining test light first according to the power loss of described test light first, and according to tentatively determining that the event location of optical fiber estimates the dynamic range of second test light testing fiber being carried out to secondary monitoring.
Step S4: redefine pulse duration and pulse interval according to the dynamic range of test light, the relation between pulse duration and pulse interval, the pulse duration redefined is less than the pulse duration of test light first.
Step S5: send described second test light with the pulse duration redefined and pulse interval and transmit in testing fiber, and receive the reverberation of described second test light in described testing fiber, to carry out secondary monitoring to testing fiber.
Step S6: the power loss detecting second test light according to described reverberation.
Step S7: the power loss according to described second test light carries out secondary event location to testing fiber.
Due to the range of test light first when secondary monitoring distance is less than first time monitoring, the dynamic range of two test light of secondary monitoring also diminishes, pulse duration and the pulse interval of the second test light obtained according to test light dynamic range and the pulse duration of its pulse signal and the above-mentioned relation between the time interval all reduce, the pulse duration of pulse signal is less, energy is less, resolution is higher, the monitoring blind area produced is also less, the time interval of pulse signal is less, the error produced is also less, therefore, secondary monitoring is carried out to testing fiber and decreases monitoring blind area and error, improve the precision of state event location.
Further, the described step estimated testing fiber carries out the dynamic range of the second test light of secondary monitoring comprises: redefine the secondary monitoring distance of testing fiber being carried out to secondary monitoring according to the event location of the optical fiber tentatively determined, and estimate the dynamic range of described second test light according to described secondary monitoring distance.
Further, describedly tentatively determine that the step of the event location of optical fiber comprises the event location tentatively determining optical fiber according to the curve of the power loss of described test light first, described determine described in the step of the dynamic range of test light first comprise the dynamic range determining test light first according to the curve of the power loss of described test light first.
Further, the dynamic range of described test light, the pass between pulse duration and pulse interval are: the dynamic range of test light often reduces by a unit, pulse interval reduces 4 times, and pulse duration reduces 2 times, and the dynamic range of a described unit is 1.5dB.
In equipment of the present invention and method, obviously, each parts or each step reconfigure after can decomposing, combine and/or decomposing.These decompose and/or reconfigure and should be considered as equivalents of the present invention.Also it is pointed out that the step performing above-mentioned series of processes can order naturally following the instructions perform in chronological order, but do not need necessarily to perform according to time sequencing.Some step can walk abreast or perform independently of one another.Simultaneously, above in the description of the specific embodiment of the invention, the feature described for a kind of execution mode and/or illustrate can use in one or more other execution mode in same or similar mode, combined with the feature in other execution mode, or substitute the feature in other execution mode.
Claims (9)
1. a Larger Dynamic non-blind area monitoring system, is characterized in that, comprising:
Optical time domain detector, for with predetermined pulse width and pulse interval to testing fiber send first test light to transmit in testing fiber, and the reverberation of test light in described testing fiber first described in receiving, and detect the power loss of test light first according to described reverberation;
Distance analysis module, for tentatively determining the event location of described testing fiber according to the power loss of described test light first, described event location is any one in optical fiber end points, breakpoints of optical fiber and optical fiber pad;
Accurate measurement parameter determination module, for determining the dynamic range of test light first, and according to tentatively determining that the event location of optical fiber estimates the dynamic range of second test light testing fiber being carried out to secondary monitoring according to the power loss of described test light first; And
Parameter reset module, for the dynamic range according to test light, relation between pulse duration and pulse interval redefines pulse duration and pulse interval, the pulse duration redefined is less than the pulse duration of test light first, described optical time domain detector is made to send described second test light with the pulse duration redefined and pulse interval and transmit in testing fiber, and receive the reverberation of described second test light in described testing fiber, and the power loss of second test light is detected according to described reverberation, described distance analysis module carries out secondary event location according to the power loss of described second test light to testing fiber.
2. Larger Dynamic non-blind area as claimed in claim 1 monitoring system, it is characterized in that, the event location of the optical fiber that described accurate measurement parameter determination module is tentatively determined according to distance analysis module redefines the secondary monitoring distance of testing fiber being carried out to secondary monitoring, and estimates the dynamic range of described second test light according to described secondary monitoring distance.
3. Larger Dynamic non-blind area as claimed in claim 2 monitoring system, it is characterized in that, described secondary monitoring distance is the event location of the optical fiber that described distance analysis module is tentatively determined and the product of a coefficient, the range of test light first described in described secondary monitoring distance is less than.
4. Larger Dynamic non-blind area as claimed in claim 1 monitoring system, it is characterized in that, described distance analysis module tentatively determines the event location of optical fiber according to the curve of the power loss of described test light first, and described accurate measurement parameter determination module determines the dynamic range of test light first according to the curve of the power loss of described test light first.
5. Larger Dynamic non-blind area as claimed in claim 1 monitoring system, it is characterized in that, the dynamic range of described test light, the pass between pulse duration and pulse interval are: the dynamic range of test light often reduces by a unit, pulse interval reduces 4 times, pulse duration reduces 2 times, and the dynamic range of a described unit is 1.5dB.
6. a Larger Dynamic non-blind area monitoring method, is characterized in that, comprising:
With predetermined pulse width and pulse interval to testing fiber send first test light to transmit in testing fiber, and the reverberation of test light in described testing fiber first described in receiving, and detect the power loss of test light first according to described reverberation;
Tentatively determine the event location of described testing fiber according to the power loss of described test light first, described event location is any one in optical fiber end points, breakpoints of optical fiber and optical fiber pad;
The dynamic range of test light is first determined according to the power loss of described test light first, and according to tentatively determining that the event location of optical fiber estimates the dynamic range of second test light testing fiber being carried out to secondary monitoring;
Redefine pulse duration and pulse interval according to the dynamic range of test light, the relation between pulse duration and pulse interval, the pulse duration redefined is less than the pulse duration of test light first;
Send described second test light with the pulse duration redefined and pulse interval and transmit in testing fiber, and receiving the reverberation of described second test light in described testing fiber, to carry out secondary monitoring to testing fiber;
The power loss of second test light is detected according to described reverberation;
Power loss according to described second test light carries out secondary event location to testing fiber.
7. Larger Dynamic non-blind area as claimed in claim 6 monitoring method, it is characterized in that, the described step estimated testing fiber carries out the dynamic range of the second test light of secondary monitoring comprises: redefine the secondary monitoring distance of testing fiber being carried out to secondary monitoring according to the event location of the optical fiber tentatively determined, and estimate the dynamic range of described second test light according to described secondary monitoring distance.
8. Larger Dynamic non-blind area as claimed in claim 6 monitoring method, it is characterized in that, describedly tentatively determine that the step of the event location of optical fiber comprises the event location tentatively determining optical fiber according to the curve of the power loss of described test light first, described determine described in the step of the dynamic range of test light first comprise the dynamic range determining test light first according to the curve of the power loss of described test light first.
9. Larger Dynamic non-blind area as claimed in claim 6 monitoring method, it is characterized in that, the dynamic range of described test light, the pass between pulse duration and pulse interval are: the dynamic range of test light often reduces by a unit, pulse interval reduces 4 times, pulse duration reduces 2 times, and the dynamic range of a described unit is 1.5dB.
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| CN109547099A (en) * | 2018-11-22 | 2019-03-29 | 桂林聚联科技有限公司 | A method of for the adaptive pulsewidth detection of OTDR module in fiber optic cable monitor |
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