阅读说明：本技术 一种基于dvs光纤振动感测的供水管道渗漏监测方法 (DVS optical fiber vibration sensing-based water supply pipeline leakage monitoring method ) 是由 许鲁亮 施海仁 曹奇 于 2021-07-19 设计创作，主要内容包括：本发明公开了一种基于DVS光纤振动感测的供水管道渗漏监测方法,涉及渗漏监测技术领域,具体包括：将光纤作为传感器沿着供水管道布置；激光脉冲与光纤分子相互作用,产生后向瑞利散射形式的反射光感应信号；光纤振动监测主机基于反射光感应信号得到光纤沿供水管道各点的振动信号,判断是否存在泄漏点；对泄漏位置进行定位,并分配对应工作人员至泄漏位置进行检修；本发明中光纤敷设于供水管道并紧贴在管道上,通过感测供水管道振动定位渗漏位置,能实现超长距离、高精度的实时监测,同时在管道上方10公分处敷设另一根光纤；通过两个光纤采集振动信号,相互可以抵消同样的车辆行驶等外界环境的影响,监测精度更高。(The invention discloses a water supply pipeline leakage monitoring method based on DVS optical fiber vibration sensing, which relates to the technical field of leakage monitoring and specifically comprises the following steps: arranging an optical fiber as a sensor along the water supply pipeline; the laser pulse interacts with the optical fiber molecules to generate a reflected light induction signal in a backward Rayleigh scattering form; the optical fiber vibration monitoring host machine obtains vibration signals of each point of the optical fiber along the water supply pipeline based on the reflected light induction signals and judges whether a leakage point exists or not; positioning the leakage position, and distributing corresponding workers to the leakage position for maintenance; according to the invention, the optical fiber is laid on the water supply pipeline and is tightly attached to the pipeline, the leakage position is positioned by sensing the vibration of the water supply pipeline, the ultra-long-distance and high-precision real-time monitoring can be realized, and meanwhile, another optical fiber is laid at a position 10 cm above the pipeline; vibration signals are acquired through the two optical fibers, the influence of the same external environments such as vehicle running and the like can be mutually counteracted, and the monitoring precision is higher.)

1. A water supply pipeline leakage monitoring method based on DVS optical fiber vibration sensing is characterized by comprising the following steps:

s1: arranging an optical fiber as a sensor along the water supply pipeline; the optical fiber is tightly attached to the water supply pipeline;

s2: the laser source emits narrow pulse width laser pulses which are transmitted along the optical fiber after wavelength division multiplexing, and the laser pulses interact with optical fiber molecules to generate reflected light induction signals in a backward Rayleigh scattering form; the optical fiber vibration monitoring host machine obtains vibration signals of each point of the optical fiber along the water supply pipeline based on the reflected light induction signals and judges whether a leakage point exists or not;

s3: if the leakage point exists, positioning the leakage position; and corresponding workers are distributed to the leakage position for maintenance; if leakage points exist, an audible and visual alarm gives an alarm, and the leakage position is fed back to the optical fiber vibration monitoring host.

2. The water supply pipeline leakage monitoring method based on DVS optical fiber vibration sensing of claim 1, wherein the optical fiber vibration monitoring host machine obtains vibration signals of the optical fiber along each point of the water supply pipeline based on the reflected light induction signal, and judges whether a leakage point exists; the specific judgment method comprises the following steps:

because the optical fiber is tightly attached to the water supply pipeline, if the water supply pipeline leaks, the leakage position is affected by the spraying of high-pressure water, the leakage position vibrates, the refractive index of the optical fiber at the corresponding position changes, and the optical phase at the position changes; the change of the optical phase can cause the interference result of backward Rayleigh scattering light;

the fiber vibration monitoring host collects the interference result of the backward Rayleigh scattering light and judges whether a leakage point exists or not by detecting the interference result of the backward Rayleigh scattering light within the pulse width range.

3. The DVS fiber optic vibration sensing based water supply pipeline leak monitoring method of claim 1 wherein the fiber optic is secured to a side of the water supply pipeline and is disposed along an axial direction of the water supply pipeline.

4. The DVS fiber optic vibration sensing-based water supply pipeline leak monitoring method of claim 1, wherein the optical fiber is a vibration sensitive stainless steel armor structure.

5. The DVS fiber vibration sensing-based water supply pipeline leakage monitoring method of claim 1, wherein if there is a leakage point, locating the leakage location; the specific positioning method comprises the following steps:

and starting timing while sending the narrow pulse width laser pulse, calculating the time difference from sending the narrow pulse width laser pulse to receiving a back scattering Rayleigh light interference result, and determining the tap water leakage position according to the time difference.

6. The DVS fiber vibration sensing based water supply pipeline leakage monitoring method of claim 1 wherein there are two optical fibers, one on the pipeline and one 10 cm above the pipeline; acquiring vibration signals through two optical fibers, and offsetting and filtering the acquired vibration signals, namely removing the same vibration signals and only leaving different vibration signals; wherein the left vibration signal is the vibration signal of the water supply pipeline.

7. The DVS fiber vibration sensing-based water supply pipeline leakage monitoring method according to claim 1, wherein the method is performed by a fiber vibration monitoring system, and the fiber vibration monitoring system comprises a timing module, a signal acquisition module, a leakage positioning module, a fiber vibration monitoring host and an alarm module;

when the laser source emits narrow pulse width laser pulse, the timing module starts timing;

the signal acquisition module is used for acquiring the reflected light induction signals in the backward Rayleigh scattering form in real time and transmitting the acquired reflected light induction signals to the optical fiber vibration monitoring host;

the optical fiber vibration monitoring host is used for processing and analyzing the reflected light induction signals to obtain vibration signals of each point of the optical fiber along the water supply pipeline and judging whether a leakage point exists or not; the method specifically comprises the following steps:

the optical fiber vibration monitoring host judges whether a leakage point exists or not by detecting the interference result of the backward scattering Rayleigh light within the pulse width range;

if the leakage point exists, generating an early warning signal; the optical fiber vibration monitoring host controls the timing module to stop timing after receiving the early warning signal and drives the alarm module to give an alarm, wherein the alarm module is an audible and visual alarm;

and the leakage positioning module is used for positioning a leakage point after receiving the early warning signal and feeding back the position of tap water leakage to the optical fiber vibration monitoring host for display.

8. The DVS fiber optic vibration sensing-based water supply pipeline leak monitoring method of claim 7, wherein the signal acquisition module comprises two optical fibers, one laid over the pipeline and one laid 10 centimeters above the pipeline; vibration signals are collected through the two optical fibers, and the collected vibration signals are offset and filtered.

Technical Field

The invention relates to the technical field of leakage monitoring, in particular to a water supply pipeline leakage monitoring method based on DVS optical fiber vibration sensing.

Background

Water supply network leakage is a global problem, and according to literature reports, the global average pipe network leakage rate (water leakage from the pipe network divided by total water supply) is 35%. Therefore, in order to save water resources and realize sustainable development, the leakage of the pipe network must be reduced. The leakage of the pipe network is caused by various reasons, such as the breakage of a pipeline main body, the breakage of a pipeline joint, the water leakage of pipeline accessories (a gate, a valve, a fire hydrant and the like) and the like;

when the underground water supply pipe network leaks water, pressure water leaks from the pipeline and is sprayed out, friction sound waves are generated between the pressure water and a pipeline leakage opening, and meanwhile, the pressure water collides with surrounding media to generate collision, so that water leakage sound is generated. The leakage of the urban water supply pipeline is generally heard by arranging an acoustic wave leak detector in the exposed pipeline or the soil on the upper layer of the pipeline, and the leakage point can be judged only by continuously moving; in order to avoid interference of ambient environment and water of residents, the inspection time is selected at night, and whether water leakage occurs or not is judged according to the existence of leakage sound; the traditional leakage monitoring method has poor leak detection timeliness, detection can be carried out only by manually detecting leakage after the leakage happens for a long time, and water resources are seriously wasted.

Disclosure of Invention

In order to solve the problems existing in the scheme, the invention provides a water supply pipeline leakage monitoring method based on DVS optical fiber vibration sensing. In the invention, the optical fiber is laid in the water supply pipeline and is tightly attached to the pipeline, once leakage occurs, the leakage part can vibrate under the influence of high-pressure water spraying, and the leakage position is positioned by sensing the vibration of the water supply pipeline; the system can realize the real-time monitoring with ultra-long distance and high precision, resist electromagnetic interference and early warning in time, thereby ensuring the safe and normal operation of a water supply pipeline; laying another optical fiber 10 cm above the pipeline; vibration signals are acquired through the two optical fibers, the influence of the same external environments such as vehicle running and the like can be mutually counteracted, and the monitoring precision is higher.

The purpose of the invention can be realized by the following technical scheme: a DVS fiber vibration sensing-based water supply pipeline leakage monitoring method comprises the following steps:

s1: arranging an optical fiber as a sensor along the water supply pipeline; the optical fiber is tightly attached to the water supply pipeline;

s2: the laser source emits narrow pulse width laser pulses which are transmitted along the optical fiber after wavelength division multiplexing, and the laser pulses interact with optical fiber molecules to generate reflected light induction signals in a backward Rayleigh scattering form; the optical fiber vibration monitoring host machine obtains vibration signals of each point of the optical fiber along the water supply pipeline based on the reflected light induction signals and judges whether a leakage point exists or not;

s3: if the leakage point exists, positioning the leakage position; and corresponding workers are distributed to the leakage position for maintenance; if leakage points exist, an audible and visual alarm gives an alarm, and the leakage position is fed back to the optical fiber vibration monitoring host.

Further, the optical fiber vibration monitoring host machine obtains vibration signals of the optical fiber along each point of the water supply pipeline based on the reflected light induction signals, and judges whether leakage points exist or not; the specific judgment method comprises the following steps:

because the optical fiber is tightly attached to the water supply pipeline, if the water supply pipeline leaks, the leakage position is affected by the spraying of high-pressure water, the leakage position vibrates, the refractive index of the optical fiber at the corresponding position changes, and the optical phase at the position changes; the change of the optical phase can cause the interference result of backward Rayleigh scattering light;

the fiber vibration monitoring host collects the interference result of the backward Rayleigh scattering light and judges whether a leakage point exists or not by detecting the interference result of the backward Rayleigh scattering light within the pulse width range.

Further, the optical fiber is fixed to the side of the water supply pipeline and is arranged along the axial direction of the water supply pipeline.

Further, the optical fiber is of a vibration sensitive stainless steel armor structure.

Further, if a leakage point exists, the leakage position is positioned; the specific positioning method comprises the following steps:

and starting timing while sending the narrow pulse width laser pulse, calculating the time difference from sending the narrow pulse width laser pulse to receiving a back scattering Rayleigh light interference result, and determining the tap water leakage position according to the time difference.

Furthermore, two optical fibers are laid, one optical fiber is laid on the pipeline, and the other optical fiber is laid at a position 10 centimeters above the pipeline; acquiring vibration signals through two optical fibers, and offsetting and filtering the acquired vibration signals, namely removing the same vibration signals and only leaving different vibration signals; wherein the left vibration signal is the vibration signal of the water supply pipeline.

Further, the method is executed through an optical fiber vibration monitoring system, wherein the optical fiber vibration monitoring system comprises a timing module, a signal acquisition module, a leakage positioning module, an optical fiber vibration monitoring host and an alarm module;

when the laser source emits the narrow pulse width laser pulse, the timing module starts timing and marks the time when the laser source emits the narrow pulse width laser pulse as an initial time;

the signal acquisition module is used for acquiring the reflected light induction signals in the backward Rayleigh scattering form in real time and transmitting the acquired reflected light induction signals to the optical fiber vibration monitoring host;

the optical fiber vibration monitoring host is used for processing and analyzing the reflected light induction signals to obtain vibration signals of each point of the optical fiber along the water supply pipeline and judging whether a leakage point exists or not; the method specifically comprises the following steps:

the optical fiber vibration monitoring host judges whether a leakage point exists or not by detecting the interference result of the backward scattering Rayleigh light within the pulse width range;

if the leakage point exists, generating an early warning signal; the optical fiber vibration monitoring host controls the timing module to stop timing after receiving the early warning signal and drives the alarm module to give an alarm, wherein the alarm module is an audible and visual alarm;

and the leakage positioning module is used for positioning a leakage point after receiving the early warning signal and feeding back the position of tap water leakage to the optical fiber vibration monitoring host for display.

The signal acquisition module comprises two optical fibers, one optical fiber is laid on the pipeline, and the other optical fiber is laid at a position 10 centimeters above the pipeline; vibration signals are collected through the two optical fibers, and the collected vibration signals are offset and filtered.

Compared with the prior art, the invention has the beneficial effects that:

1. two optical fibers are laid, one optical fiber is laid on a pipeline, and the other optical fiber is laid 10 centimeters above the pipeline; vibration signals are collected through the two optical fibers, and the same external vibration such as vehicle running and the like can be counteracted mutually; the influence of the surrounding environment on the vibration of the water supply pipeline is eliminated, and the monitoring precision is high;

2. in the invention, the optical fiber is laid in a water supply pipeline and is tightly attached to the pipeline, once leakage occurs, the leakage part can vibrate under the influence of high-pressure water spraying, the refractive index of the optical fiber at the corresponding position can change, and the optical phase at the position can change; the change of the optical phase can cause the interference result of backward Rayleigh scattering light; the optical fiber vibration monitoring host judges whether a leakage point exists or not by detecting the interference result of the backward scattering Rayleigh light within the pulse width range; if the leakage point exists, an audible and visual alarm is used for alarming; meanwhile, calculating the time difference from sending the narrow pulse width laser pulse to receiving the back scattering Rayleigh light interference result, and determining the position of tap water leakage; the system can realize the real-time monitoring of ultra-long distance and high precision, resist electromagnetic interference and timely early warning, thereby ensuring the safe and normal operation of the water supply pipeline.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic flow chart of the present invention.

Fig. 2 is a schematic block diagram of an optical fiber vibration monitoring system according to the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-2, a method for monitoring water supply pipeline leakage based on DVS fiber vibration sensing comprises the following steps:

s1: arranging an optical fiber as a sensor along the water supply pipeline; the optical fiber is tightly attached to the water supply pipeline;

s2: the laser source emits narrow pulse width laser pulses which are transmitted along the optical fiber after wavelength division multiplexing, and the laser pulses interact with optical fiber molecules to generate reflected light induction signals in a backward Rayleigh scattering form; the optical fiber vibration monitoring host machine obtains vibration signals of each point of the optical fiber along the water supply pipeline based on the reflected light induction signals and judges whether a leakage point exists or not;

s3: if the leakage point exists, positioning the leakage position; and corresponding workers are distributed to the leakage position for maintenance; if the leakage point exists, alarming is carried out through an audible and visual alarm, and the leakage position is fed back to the optical fiber vibration monitoring host;

the laser source emits narrow pulse width laser pulses which are transmitted along the optical fiber after wavelength division multiplexing, the laser pulses interact with optical fiber molecules to generate reflected light induction signals in a backward Rayleigh scattering mode, and because the optical fiber is tightly attached to a water supply pipeline, if the water supply pipeline leaks, the leakage position is influenced by high-pressure water spraying, the leakage position vibrates, the refractive index of the optical fiber at the corresponding position changes, and the optical phase at the position changes; the change of the optical phase can cause the interference result of backward Rayleigh scattering light; the fiber vibration monitoring host collects the interference result of the backward Rayleigh scattering light and judges whether a leakage point exists or not by detecting the interference result of the backward Rayleigh scattering light within the pulse width range;

the DVS optical fiber vibration sensing system takes an optical fiber as a sensor to sense vibration; the system is based on a coherent time division multiplexing sensing principle, and realizes the sensing and space positioning functions of a vibration event by comprehensively utilizing a backward Rayleigh coherent scattering effect (backward Rayleigh coherent scattering) in an optical fiber and an Optical Time Domain Reflectometry (OTDR) technology;

wherein, the optical fiber is fixed on the side surface of the water supply pipeline and is arranged along the axial direction of the water supply pipeline;

wherein, the optical fiber is a vibration sensitive stainless steel armor structure.

The optical fiber is used as a sensor based on the Rayleigh scattering principle.

Wherein the frequency range of the vibration signals collected by the optical fiber is 0.1HZ-1 KHZ;

if a leakage point exists, positioning the leakage position; the specific positioning method comprises the following steps:

starting timing while sending the narrow pulse width laser pulse, calculating the time difference from sending the narrow pulse width laser pulse to receiving the back scattering Rayleigh light interference result, and determining the position of tap water leakage;

wherein, two optical fibers are laid, one is laid on the pipeline, and the other is laid at the position 10 cm above the pipeline; vibration signals are collected through the two optical fibers, and the same external vibration such as vehicle running and the like can be counteracted mutually; removing the same vibration signal and only leaving different vibration signals; the left vibration signal is the vibration signal of the water supply pipeline; by arranging the two optical fibers, the influence of the surrounding environment on the vibration of the water supply pipeline can be eliminated; the monitoring precision is high, and the safe and normal operation of a water supply pipeline is guaranteed;

wherein the distribution corresponds staff and overhauls to leaking the position, and concrete distribution step is:

v1: the optical fiber vibration monitoring host issues a water supply pipeline maintenance task, wherein the maintenance task comprises the leakage position of the water supply pipeline;

v2: marking the staff who get the maintenance task within the preset time range as a primary selection staff; calculating the distance difference between the real-time position and the leakage position of the primarily selected person to obtain a person distance L1;

v3: acquiring a maintenance learning value WX of a primary selection person; the method specifically comprises the following steps:

v31: collecting the watching record of the video repaired by the primary selection personnel on the cloud platform within twenty-five days before the current time of the system; the watching records comprise watching times, watching starting time and watching ending time;

v32: counting the total times of watching the overhaul video by the primary selection personnel and marking as C1, and summing the time lengths of the primary selection personnel watching the overhaul video each time to obtain the total watching time length which is marked as C2; calculating the time difference between the latest watching ending time of the primary selection personnel and the current time of the system to obtain a buffer duration HT;

v33: calculating a maintenance learning value WX of the primary selection personnel by using a formula WX (C1 xq 1+ C2 xq 2)/(HT xq 3), wherein q1, q2 and q3 are all preset proportionality coefficients;

v4: setting the total overhaul times of the primary selection personnel as G1; calculating the time difference between the last overhaul time of the primary selection personnel and the current time of the primary selection personnel to obtain the delayed examination time length YT;

calculating a matching value GP of the primary selected person by using a formula GP ═ WX × a1+ G1 × a2+ YT × a3)/(L1 × a4, wherein a1, a2, a3 and a4 are preset proportionality coefficients;

v5: selecting the primary selected person with the largest checking and matching value as a selected person, sending the leakage position of the water supply pipeline to a mobile phone terminal of the selected person, after the selected person reaches the leakage position, overhauling the water supply pipeline, recording the overhauling process through the mobile phone terminal, and sending the recorded overhauling video to the cloud platform; and other workers access the maintenance video of the cloud platform through the mobile phone terminal and watch the maintenance video.

The method is executed by an optical fiber vibration monitoring system, wherein the optical fiber vibration monitoring system comprises a timing module, a signal acquisition module, a leakage positioning module, an optical fiber vibration monitoring host and an alarm module;

when the laser source emits the narrow pulse width laser pulse, the timing module starts timing and marks the time when the laser source emits the narrow pulse width laser pulse as an initial time;

the signal acquisition module is used for acquiring the reflected light induction signals in the backward Rayleigh scattering form in real time and transmitting the acquired reflected light induction signals to the optical fiber vibration monitoring host;

the optical fiber vibration monitoring host is used for processing and analyzing the reflected light induction signals to obtain vibration signals of each point of the optical fiber along the water supply pipeline and judging whether a leakage point exists or not; the method specifically comprises the following steps:

because the optical fiber is tightly attached to the water supply pipeline, if the water supply pipeline leaks, the leakage position is affected by the spraying of high-pressure water, the leakage position vibrates, the refractive index of the optical fiber at the corresponding position changes, and the optical phase at the position changes; the change of the optical phase can cause the interference result of backward Rayleigh scattering light;

the optical fiber vibration monitoring host judges whether a leakage point exists or not by detecting the interference result of the backward scattering Rayleigh light within the pulse width range; if the leakage point exists, generating an early warning signal;

the optical fiber vibration monitoring host controls the timing module to stop timing after receiving the early warning signal and drives the alarm module to give an alarm, wherein the alarm module is an audible and visual alarm;

the leakage positioning module positions a leakage point after receiving the early warning signal and distributes corresponding workers to the leakage position for maintenance, and the specific positioning method comprises the following steps:

acquiring the time difference between the time when the timing module stops timing and the initial time so as to determine the position of tap water leakage;

and the leakage positioning module is used for feeding back the position of tap water leakage to the optical fiber vibration monitoring host for display.

The signal acquisition module comprises two optical fibers, one optical fiber is laid on the pipeline, and the other optical fiber is laid at a position 10 centimeters above the pipeline; vibration signals are collected through the two optical fibers, and the collected vibration signals are offset and filtered.

The above formulas are all calculated by removing dimensions and taking numerical values thereof, the formula is a formula which is obtained by acquiring a large amount of data and performing software simulation to obtain the closest real situation, and the preset parameters and the preset threshold value in the formula are set by the technical personnel in the field according to the actual situation or obtained by simulating a large amount of data.

The working principle of the invention is as follows:

a DVS optical fiber vibration sensing-based water supply pipeline leakage monitoring method comprises the steps that during work, two optical fibers are laid, one optical fiber is laid on a pipeline, and the other optical fiber is laid 10 centimeters above the pipeline; vibration signals are collected through the two optical fibers, and the same external vibration such as vehicle running and the like can be counteracted mutually; removing the same vibration signals, and only reserving different vibration signals, wherein the reserved vibration signals are the vibration signals of the water supply pipeline; the influence of the surrounding environment on the vibration of the water supply pipeline can be eliminated, and the monitoring precision is high;

the laser source emits narrow pulse width laser pulses which are transmitted along the optical fiber after wavelength division multiplexing, the laser pulses interact with optical fiber molecules to generate reflected light induction signals in a backward Rayleigh scattering mode, and when an optical fiber circuit is interfered by the outside, the refractive index of the optical fiber at the corresponding position is changed, so that the optical phase at the position is changed; the change of the optical phase can cause the interference result of backward Rayleigh scattering light; the fiber vibration monitoring host collects the interference result of the backward Rayleigh scattering light and judges whether a leakage point exists or not by detecting the interference result of the backward Rayleigh scattering light within the pulse width range; if leakage points exist, alarming is carried out through an audible and visual alarm, and the leakage positions are fed back to the optical fiber vibration monitoring host; meanwhile, calculating the time difference from sending the narrow pulse width laser pulse to receiving the back scattering Rayleigh light interference result, and determining the position of tap water leakage; and corresponding workers are distributed to the leakage position for maintenance; the monitoring precision is high, and the safe and normal operation of the water supply pipeline is guaranteed.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.