CN109798448A - Concrete duct leakage experiment device and method based on anti-Stokes light filtering - Google Patents
Concrete duct leakage experiment device and method based on anti-Stokes light filtering Download PDFInfo
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- CN109798448A CN109798448A CN201910168987.0A CN201910168987A CN109798448A CN 109798448 A CN109798448 A CN 109798448A CN 201910168987 A CN201910168987 A CN 201910168987A CN 109798448 A CN109798448 A CN 109798448A
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Abstract
The invention discloses a kind of concrete duct leakage experiment device and method based on anti-Stokes light filtering, which includes including water tank, simulated leakage pipeline, water pump and distribution type fiber-optic system；Distribution type fiber-optic system includes sensor fibre, laser source, wavelength division multiplexer, directional coupler and photoelectric signal collection card；Photoelectric signal collection card gives the optical signal transmission of acquisition to the end PC, and the end PC is filtered anti-Stokes optical signal, the corresponding position of light intensity catastrophe point is obtained, to realize leak detection.The invention proposes a kind of anti-Stokes light signal antinoise methods, denoising is carried out to original anti-Stokes light intensity signal data using Savitzky-Golay algorithm filter, improve the detection accuracy of the temperature signal after optical signal conversion process, be conducive to differentiation of the testing staff to leakage signal, improve leak detection rate.
Description
Technical field
The present invention relates to Raman diffused lights to monitor field on-line, in particular to a kind of based on the mixed of anti-Stokes light filtering
Solidifying soil pipe leakage experimental provision and method.
Background technique
Heavy caliber water supply concrete duct occupies an important position in water-supply systems, once water supply line is let out
Leakage, not only causes the waste of resource, also causes huge loss to urban safety and people's lives.It is then desired to big mouth
The processing of diameter water supply concrete duct progress on-line real time monitoring and leakage.In recent years, with the development of optical fiber sensing technology, benefit
Become the common method that monitoring personnel uses with the leak detection that optical fiber temperature measurement system carries out water supply line.But actually detected
In, the landform as locating for concrete water supply line is complex and the influence of part adverse circumstances, deposits in gained detection signal
In more noise signal, so that can not accurately identify the specific leakage point of pipeline when monitoring, some even can not distinguish that pipeline has
No leakage generation and erroneous judgement do not generate the point of leakage, bring more inconvenience to testing staff, therefore how to acquisition
Optical signal carry out effectively filtering and become the problem of annoying staff always to accurately finding leakage point just.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of coagulation based on anti-Stokes light filtering
Native pipe leakage experimental provision and method improve the detection accuracy of the temperature signal obtained by optical signal.
To achieve the above object, the present invention provides following scheme: a kind of pipe of concrete based on anti-Stokes light filtering
Road leakage experiment device, including water tank, simulated leakage pipeline, water pump and distribution type fiber-optic system；The distribution type fiber-optic system
System includes sensor fibre, laser source, directional coupler, wavelength division multiplexer and photoelectric signal collection card；
The simulated leakage pipeline is used for simcity heavy caliber concrete water supply line, lays in the pipeline outer wall bottom
Sensor fibre, sensor fibre are enclosed in pipeline junction coiling at least 2, and sensor fibre one end connects directional coupler；The laser
Wavelength division multiplexer input terminal is accessed after connecting directional coupler in source；The photoelectric signal collection card connection wavelength division multiplexer output
End, for acquiring the stokes light and anti-Stokes optical signal of sensor fibre；
The simulated leakage pipeline one end connection water tank outlet valve, the other end by water pump connection water tank into
Water valve；
The photoelectric signal collection card gives the optical signal transmission of acquisition to the end PC；The end PC is to anti-Stokes optical signal
It is filtered, the corresponding position of light intensity catastrophe point is obtained, to realize leak detection.
A method of concrete duct leakage experiment being carried out using above-mentioned apparatus, this method comprises:
Step 1: opening water tank switch, anti-Stokes optical signal data is recorded by distribution type fiber-optic system；
Step 2: the signal data of acquisition is filtered, specific as follows:
(1) position-light intensity curve before being filtered according to anti-Stokes optical signal data；
(2) assume that filtered position-light intensity curve is y=a0+a1x+a2x2+a3x3+…+akxk, when the cross of each position
Coordinate substitute into curvilinear equation when, it is resulting value and the point ordinate difference quadratic sum minimum when, the fitting degree of the curve
Highest；
(3) ordinate p of the position-light intensity curve in the point of hypothesis is determined according to the least square fitting of sliding window
(n), specifically:
According to formulaObtain the residual values ε of least square fittingn, whereinX (n) is ordinate of the position-light intensity curve before filtering in the point, and-M is position-light intensity curve original
Point, M are the maximum abscissa of position-light intensity curve；
(4) coefficient in the position-light intensity curve function assumed is determined according to the smallest principle of residual values, specifically:
It is zero to the derivative of each coefficient by enabling residual values, then by using convolution coefficient table to keep residual values minimum
In convolution coefficient determine a0,a1,...,akSize, determine that method is as follows:
Wherein b0,...,bkValue can pass through convolution coefficient table determine.
Step 3: according to filtered position-light intensity curve, the corresponding position of light intensity catastrophe point is obtained, to be leaked
Point.
Beneficial effects of the present invention are as follows: the invention proposes a kind of anti-Stokes light signal antinoise methods, use
Savitzky-Golay algorithm filter carries out denoising to original anti-Stokes light intensity signal data, improves by light
The detection accuracy of temperature signal after signal conversion processes is conducive to differentiation of the testing staff to leakage signal, improves leakage inspection
Survey rate.
Detailed description of the invention
Fig. 1 is concrete duct leakage experiment apparatus structure schematic diagram of the present invention；
Fig. 2 is the flow chart that concrete duct leakage experiment of the present invention fills embodiment of the method；
Fig. 3 is using the method for the present invention to the comparison diagram before and after signal processing.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of concrete duct leakage experiment dress based on anti-Stokes light filtering provided by the invention
It sets, which includes water tank, simulated leakage pipeline, water pump and distribution type fiber-optic system；The distribution type fiber-optic system includes
Sensor fibre, laser source, directional coupler, wavelength division multiplexer and photoelectric signal collection card；
The simulated leakage pipeline is used for simcity heavy caliber concrete water supply line, lays in the pipeline outer wall bottom
Sensor fibre, sensor fibre are enclosed in pipeline junction coiling at least 2, access wavelength-division after sensor fibre one end connection directional coupler
Multiplexer inputs；The laser source connects wavelength division multiplexer input terminal；The photoelectric signal collection card connects wavelength division multiplexer
Output end, for acquiring the stokes light and anti-Stokes optical signal of sensor fibre；When temperature change occurs for optical fiber,
The Raman Back Scattering light for having temperature information is collected in stokes light and anti-Stokes light using wavelength division multiplexer；It is described
The outlet valve of one end connection water tank of simulated leakage pipeline, the other end connect the inlet valve of water tank by water pump；
The photoelectric signal collection card gives the optical signal transmission of acquisition to the end PC；The end PC is to anti-Stokes optical signal
It is filtered, the corresponding position of light intensity catastrophe point is obtained, to realize leak detection.
As shown in Fig. 2, the method for carrying out leakage experiment using concrete duct leakage experiment device, this method comprises:
Step 1: opening water tank switch, anti-Stokes optical signal data is recorded by distribution type fiber-optic system；
Before obtaining original detection signal, by sensor fibre along the outer wall cloth of concrete leakage pipe to be detected
It puts, temperature correction, position correction then is carried out to distribution type fiber-optic system.Measurement channel, time of measuring, disconnected fine alarm length are set
Degree, alarm subregion.Pipeline leakage testing is carried out in concrete duct, is saved obtained Raman scattering optical signal, that is, is based on
The optical signal that concrete water transfer pipeline generates when leaking.
Step 2: the signal data of acquisition is filtered, specific as follows:
(1) position-light intensity curve before being filtered according to anti-Stokes optical signal data；
(2) assume that filtered position-light intensity curve is y=a0+a1x+a2x2+a3x3+…+akxk, when the cross of each position
Coordinate substitute into curvilinear equation when, it is resulting value and the point ordinate difference quadratic sum minimum when, the fitting degree of the curve
Highest；
(3) ordinate p of the position-light intensity curve in the point of hypothesis is determined according to the least square fitting of sliding window
(n), specifically:
According to formulaObtain the residual values ε of least square fittingn, whereinX (n) is ordinate of the position-light intensity curve before filtering in the point, and-M is position-light intensity curve original
Point, M are the maximum abscissa of position-light intensity curve；
(4) coefficient in the position-light intensity curve function assumed is determined according to the smallest principle of residual values, specifically:
It is zero to the derivative of each coefficient by enabling residual values, then by using convolution coefficient table to keep residual values minimum
In convolution coefficient determine a0,a1,...,akSize, determine that method is as follows:
Wherein b0,...,bkValue can pass through convolution coefficient table determine.
Step 3: according to filtered position-light intensity curve, the corresponding position of light intensity catastrophe point is obtained, to be leaked
Point.
In a specific example, the length of sensor fibre is set as 200 meters；It is arranged at leakage apart from laser emitting source
About 170 meters.Simulated leakage pipeline is heavy caliber concrete water transfer pipeline, and pipeline is connected and composed by the sub-pipes of 8 meter Yi Jie, pipeline
With being centrally disposed in same horizontal line for tie point.
Fig. 3 is using the device of the invention and method to the comparison diagram before and after signal processing.Fig. 3 illustrates original signal
The comparison diagram of figure, Savitzky-Golay filtering figure, as can be seen from Figure 3 can be after apparatus and method of the present invention is handled
It is will become apparent from figure at 170 meters or so places since the leakage of simulated leakage pipeline causes anti-Stokes light at this to be mutated, it was demonstrated that
Practicability of the invention.
The present invention is using Savitzky-Golay filtering algorithm to the sensor fibre anti-Stokes light signal curve of acquisition
Carry out polynomial convolution；The high and low frequency part in optical signals is separated according to convolution coefficient table；Low frequency in fitted signal
Part smoothly goes out high frequency section, obtains filtered optical signal curve；Improve the temperature after optical signal conversion process
The detection accuracy for spending signal is conducive to differentiation of the testing staff to leakage signal, improves leak detection rate.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (2)
1. a kind of concrete duct leakage experiment device based on anti-Stokes light filtering, which is characterized in that the device includes
Water tank, simulated leakage pipeline, water pump and distribution type fiber-optic system；The distribution type fiber-optic system includes sensor fibre, laser
Source, directional coupler, wavelength division multiplexer and photoelectric signal collection card；
The simulated leakage pipeline is used for simcity heavy caliber concrete water supply line, lays and senses in the pipeline outer wall bottom
Optical fiber, sensor fibre are enclosed in pipeline junction coiling at least 2, access wavelength-division multiplex after sensor fibre one end connection directional coupler
Device input terminal；Wavelength division multiplexer input terminal is accessed after the laser source connection directional coupler；The photoelectric signal collection card connects
Wavelength division multiplexer output end is connect, for acquiring the stokes light and anti-Stokes optical signal of sensor fibre；
The outlet valve of one end connection water tank of the simulated leakage pipeline, the other end connect the water inlet of water tank by water pump
Valve；
The photoelectric signal collection card gives the optical signal transmission of acquisition to the end PC；The end PC carries out anti-Stokes optical signal
Filtering, obtains the corresponding position of light intensity catastrophe point, to realize leak detection.
2. a kind of method for carrying out concrete duct leakage experiment using claim 1 described device, which is characterized in that this method
Include:
Step 1: opening water tank switch, anti-Stokes optical signal data is recorded by distribution type fiber-optic system；
Step 2: the signal data of acquisition is filtered, specific as follows:
(1) position-light intensity curve before being filtered according to anti-Stokes optical signal data；
(2) assume that filtered position-light intensity curve is y=a0+a1x+a2x2+a3x3+…+akxk, when the abscissa of each position
Substitute into curvilinear equation when, it is resulting value and the point ordinate difference quadratic sum minimum when, the fitting degree highest of the curve；
(3) ordinate p (n) of the position-light intensity curve assumed in the point, tool are determined according to the least square fitting of sliding window
Body are as follows:
According to formulaObtain the residual values ε of least square fittingn, wherein
X (n) is ordinate of the position-light intensity curve before filtering in the point, and-M is position-light intensity curve origin, and M is position-light
The maximum abscissa of strong curve；
(4) coefficient in the position-light intensity curve function assumed is determined according to the smallest principle of residual values, specifically:
It is zero to the derivative of each coefficient by enabling residual values, then by using in convolution coefficient table to keep residual values minimum
Convolution coefficient determines a0,a1,...,akSize, determine that method is as follows:
Wherein b0,...,bkValue can pass through convolution coefficient table determine.
Step 3: according to filtered position-light intensity curve, the corresponding position of light intensity catastrophe point is obtained, to obtain leakage point.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631618A (en) * | 2019-09-23 | 2019-12-31 | 苏州光格设备有限公司 | Fiber breakage positioning method for phi-OTDR distributed optical fiber sensing system |
| CN114166386A (en) * | 2021-12-02 | 2022-03-11 | 中国科学院城市环境研究所 | Pipeline stress detection method and system based on edge calculation |
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| CN205209700U (en) * | 2015-07-10 | 2016-05-04 | 青岛派科森光电技术股份有限公司 | Full fiber optic distributed temperature measurement monitored control system of pipeline |
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| CN106644276A (en) * | 2017-01-11 | 2017-05-10 | 唐山市神州科贸有限公司 | Monitoring system for detecting tank leakage by utilizing distributed optical fiber |
| US20170146423A1 (en) * | 2015-11-24 | 2017-05-25 | Schlumberger Technology Corporation | Detection of leaks from a pipeline using a distributed temperature sensor |
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Patent Citations (5)
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| CN1184931A (en) * | 1996-12-11 | 1998-06-17 | 唐秀家 | Method and apparatus for detecting and positioning leakage of fluid transferring pipeline |
| CN205209700U (en) * | 2015-07-10 | 2016-05-04 | 青岛派科森光电技术股份有限公司 | Full fiber optic distributed temperature measurement monitored control system of pipeline |
| US20170146423A1 (en) * | 2015-11-24 | 2017-05-25 | Schlumberger Technology Corporation | Detection of leaks from a pipeline using a distributed temperature sensor |
| CN205782032U (en) * | 2016-04-28 | 2016-12-07 | 天津精仪精测科技有限公司 | A kind of pressure pipeline leakage signal detection experimental system |
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| CN110631618A (en) * | 2019-09-23 | 2019-12-31 | 苏州光格设备有限公司 | Fiber breakage positioning method for phi-OTDR distributed optical fiber sensing system |
| CN110631618B (en) * | 2019-09-23 | 2021-12-17 | 苏州光格科技股份有限公司 | Fiber breakage positioning method for phi-OTDR distributed optical fiber sensing system |
| CN114166386A (en) * | 2021-12-02 | 2022-03-11 | 中国科学院城市环境研究所 | Pipeline stress detection method and system based on edge calculation |
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