CN111120877A - Drainage pipe network leakage monitoring equipment based on distributed optical fiber temperature measurement - Google Patents
Drainage pipe network leakage monitoring equipment based on distributed optical fiber temperature measurement Download PDFInfo
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- CN111120877A CN111120877A CN201911271107.9A CN201911271107A CN111120877A CN 111120877 A CN111120877 A CN 111120877A CN 201911271107 A CN201911271107 A CN 201911271107A CN 111120877 A CN111120877 A CN 111120877A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/002—Investigating fluid-tightness of structures by using thermal means
Abstract
The invention relates to a drainage pipe network leakage monitoring device based on distributed optical fiber temperature measurement, which comprises a temperature sensing optical cable and a monitoring host machine, wherein the temperature sensing optical cable and the monitoring host machine are mutually connected, the monitoring host machine comprises a laser source and a processing module, the temperature sensing optical cable is laid in a drainage pipeline and generates a reflected light induction signal for laser of the laser source, the processing module obtains the temperature of each point along the temperature sensing optical cable based on the reflected light induction signal, judges whether a leakage point exists or not, and positions the leakage position when the leakage point exists. Compared with the prior art, the leakage monitoring device based on the temperature sensing optical cable realizes monitoring of leakage points based on the temperature signal of the temperature sensing optical cable, further realizes leakage monitoring of the whole drainage pipe network, and realizes large-range coverage and real-time monitoring of the leakage condition of the drainage pipe network.
Description
Technical Field
The invention relates to leakage monitoring equipment, in particular to drainage pipe network leakage monitoring equipment based on distributed optical fiber temperature measurement.
Background
The urban drainage pipe network system is used for discharging urban domestic sewage, rainwater and industrial sewage. The monitoring and maintenance of the urban sewage pipe network is an important link of the safety management and operation of the urban water environment water. The problems of breakage, deformation, siltation, collapse and the like begin to occur along with the increase of service life and the heavy pressure action of road surface load of partial urban drainage pipelines, so that functional and structural diseases of a drainage pipe network are caused. In areas with high underground water level, a large amount of sewage permeates into a sewage pipe network from the damaged position of the pipeline, so that the sewage quantity is greatly increased, the sewage quality concentration is reduced, and pressure is caused for the subsequent treatment of sewage plants; infiltration of rainfall also presents the same problem. The sewer line is in direct contact with the soil and once leakage occurs, the quality of the soil is directly affected. In addition, the influence of sewage seepage caused by sewage pipe network leakage on the surrounding living environment is not negligible. At present, the real-time monitoring technology for the leakage of the whole pipeline of the drainage pipe network in China is not mature enough, and the leakage problem of the drainage pipe network is increasingly prominent.
Although there is a certain research on the on-line monitoring of municipal sewage drainage pipe networks, for example, chinese patent CN102287620B discloses an in-situ automatic monitoring system and method for underground sewage pipeline leakage, chinese patent CN110068867A discloses a method for monitoring heavy metal sewage leakage by an induced polarization method with embedded measuring electrodes, and both successively disclose devices for monitoring leakage of municipal drainage pipe networks. However, in the former, a resistivity probe rod is buried or penetrated into a monitoring point selected along the underground sewage pipe, and automatic alarm is generated when leakage is controlled by software, so that monitoring of a certain point is realized, and real-time monitoring is not performed on all pipelines of a drainage pipe network. The soil model of the pre-buried leakage passage area and the main body pollution area is adopted in the soil model, and the induced polarization device for monitoring the heavy metal sewage leakage is arranged, so that the soil model is mainly used for detecting and researching the heavy metal element wastewater pollution distribution in mining areas and industrial fields.
Above prior art is the problem of the detection of revealing of solving to the drain pipe network full pipeline.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide drainage pipe network leakage monitoring equipment based on distributed optical fiber temperature measurement.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a drain pipe network leakage monitoring equipment based on distributed optical fiber temperature measurement, includes interconnect's temperature sensing optical cable and monitoring host computer, the monitoring host computer includes laser source and processing module, the temperature sensing optical cable lays in drainage pipe to laser to the laser production reverberation sensing signal of laser source, processing module is based on reverberation sensing signal obtains the temperature of temperature sensing optical cable all points along the line, judges whether there is the leak source, and fixes a position the leakage position when there is the leak source.
The temperature sensing optical cable comprises a stainless steel seamless tube and sensing optical fibers arranged in the stainless steel seamless tube, and factice is filled between the stainless steel seamless tube and the sensing optical fibers.
The sensing optical fiber is positioned in the center of the stainless steel seamless tube.
And an LSZH sheath is covered outside the stainless steel seamless pipe for protection.
The laser source comprises a light source module and a wavelength division multiplexing module, the processing module comprises a photoelectric conversion module and a signal processing module, the light source module is connected with the wavelength division multiplexing module, one end of the wavelength division multiplexing module is connected with the temperature sensing optical cable, the other end of the wavelength division multiplexing module is connected with the photoelectric conversion module, and the photoelectric conversion module is connected with the signal processing module.
The light source module emits narrow-pulse-width laser pulses, the narrow-pulse-width laser pulses are transmitted along the temperature sensing optical cable after passing through the wavelength division multiplexing module, the laser pulses interact with optical fiber molecules to generate reflected light induction signals in a Raman back scattering mode, the wavelength division multiplexing module is connected with the temperature sensing optical cable to separate Stokes light and anti-Stokes light components in Raman back scattering from all scattered light, the photoelectric conversion module converts optical signals into electric signals, the signal processing module collects the electric signals and detects the variation of optical power through signal variation to obtain the temperature of each point along the temperature sensing optical cable, whether leakage points exist is judged, and the leakage positions are located when the leakage points exist.
The processing module further comprises an alarm module, and the alarm module is connected with the signal processing module.
The light source module is further connected with the signal processing module, and the position judgment process of the leakage point specifically comprises the following steps: and sending a first signal to the signal processing module while sending the narrow pulse width laser pulse, calculating the time difference from sending the narrow pulse width laser pulse to receiving the Raman scattering signal according to the first signal, and determining the position of tap water leakage.
The alarm module comprises an audible and visual alarm and a short message alarm.
Compared with the prior art, the invention has the following beneficial effects:
1) the temperature signal based on the temperature sensing optical cable realizes the monitoring of leakage points, and then realizes the monitoring of revealing of whole drain pipe network full pipeline.
2) When the pipeline leaks, an alarm can be timely sent out, the position of a leakage point is positioned, a worker is reminded to salvage and save loss, the condition deterioration is avoided, and the life of people is influenced.
3) The method can improve the accuracy of position location by sending the narrow pulse width laser pulse and sending a first signal to the signal processing module, calculating the time difference from sending the narrow pulse width laser pulse to receiving the Raman scattering signal according to the time difference, and determining the position of tap water leakage.
4) The interior of the tube is filled with factice, so that the optical cable has good waterproof and shockproof properties, and the application of the temperature-sensing optical cable in the aspect of drainage monitoring is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein: 1. temperature sensing optical cable, 2, monitoring host computer, 3, host computer, 21, wavelength division reset module, 22, photoelectric conversion module, 23, signal processing module, 24, laser module.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The utility model provides a drain pipe network leakage monitoring equipment based on distributed optical fiber temperature measurement, as shown in figure 1, temperature sensing optical cable 1 and monitoring host computer 2 including interconnect, monitoring host computer 2 includes laser source and processing module, and temperature sensing optical cable 1 lays in drainage pipe to laser to the laser production reverberation sensing signal of laser source, processing module obtains the temperature of temperature sensing optical cable 1 each point along the line based on reflection photoinduction signal, judges whether there is the leak source, and fixes a position the leakage position when there is the leak source. In addition, the upper computer 3 is connected with the monitoring host 2, and can display and store a temperature distribution curve and the alarm state of an area to be detected in real time.
In another embodiment of the present application, the upper computer 3 can also realize positioning the leakage position when the temperature exceeds the early warning value, and alarm. Has the functions of independent temperature setting, temperature difference and rapid temperature rise alarm.
The temperature sensing optical cable 1 is developed according to a back Raman scattering (Raman) principle and an optical time domain reflectometry positioning (OTDR) principle, has good Raman scattering characteristics, and the temperature sensing sensor is a whole optical fiber.
The temperature sensing optical cable 1 comprises a stainless steel seamless tube and sensing optical fibers arranged in the stainless steel seamless tube, and factice is filled between the stainless steel seamless tube and the sensing optical fibers. One optical fiber can realize long-distance continuous on-line monitoring of the temperature, the longest monitoring range of the single optical fiber is 6km, and the precision can reach +/-1 ℃.
The sensing optical fiber is positioned in the center of the stainless steel seamless tube.
The stainless steel seamless pipe is covered with an LSZH sheath for protection.
The laser source comprises a light source module 24 and a wavelength division multiplexing module 21, the processing module comprises a photoelectric conversion module 22 and a signal processing module 23, the light source module 24 is connected with the wavelength division multiplexing module 21, one end of the wavelength division multiplexing module 21 is connected with the temperature sensing optical cable 1, the other end of the wavelength division multiplexing module is connected with the photoelectric conversion module 22, and the photoelectric conversion module 22 is connected with the signal processing module 23.
The light source module 24 emits a narrow pulse width laser pulse, the laser pulse is transmitted along the temperature sensing optical cable 1 after passing through the wavelength division multiplexing module 21, the laser pulse interacts with optical fiber molecules to generate a reflected light induction signal in a Raman back scattering form, the wavelength division multiplexing module 21 is connected with the temperature sensing optical cable 1 to separate Stokes light and anti-Stokes light components in the Raman back scattering from all scattered light, the photoelectric conversion module 22 converts the light signal into an electric signal, the signal processing module 23 collects the electric signal and detects the variation of the light power through the signal variation to obtain the temperature of each point along the temperature sensing optical cable 1, whether a leakage point exists is judged, and the leakage position is positioned when the leakage point exists.
The processing module further comprises an alarm module 25, the alarm module 25 is connected with the signal processing module 23, and the alarm module 25 comprises an audible and visual alarm and a short message alarm.
The light source module 24 is further connected to the signal processing module 23, and the position determination process of the leakage point specifically includes: and sending a first signal to the signal processing module 23 while sending the narrow pulse width laser pulse, calculating a time difference from sending the narrow pulse width laser pulse to receiving the raman scattering signal according to the first signal, and determining the position of tap water leakage.
The application comprises the following specific operation steps: the optical fiber has the characteristics of no electricity, safety, no electromagnetic interference, moisture resistance and the like, so that the temperature sensing optical cable 1 is directly laid in the drainage pipeline by using the inspection well, and one optical fiber can realize long-distance continuous online monitoring of the temperature. The whole optical fiber is a sensor, and generates a reflected light induction signal to the laser of the laser source according to the leakage temperature change of the pipeline and transmits the reflected light induction signal back to the monitoring host. A wavelength division multiplexing module in the monitoring host separates the Stokes light which is insensitive to temperature and sensitive to temperature in Raman scattering from the anti-Stokes light which is sensitive to temperature, converts separated light signals into electric signals through a photoelectric conversion module and transmits the electric signals to a signal processing module; the signal processing module collects electric signals, detects the variation of the luminous power through the signal variation, transmits the data to the computer for storage, and judges whether the sewage pipeline leaks or not by comparing the collected temperature data with a set threshold value through the computer. Temperature sensing optical fibers are laid in a drainage pipe network with abnormal water delivery quantity, a source tracing early warning system for the abnormal sewage quantity of the urban drainage pipe network is constructed, and the leakage position of the drainage pipe network is located through the temperature change of a temperature measuring optical fiber system so as to provide data support for early warning and forecast of the water quality impact of inlet water of a sewage plant. The terminal management platform is an alarm receiving management platform, when the temperature monitored by the temperature sensing optical cable exceeds a set alarm threshold value, the user software can transmit alarm information reported by the overrun value to the alarm receiving platform, an alarm is given out, and meanwhile, a management person is timely notified by a short message of a mobile phone.
Claims (8)
1. The utility model provides a drainage pipe network leakage monitoring equipment based on distributed optical fiber temperature measurement, its characterized in that, temperature sensing optical cable (1) and monitoring host (2) including interconnect, monitoring host (2) include laser source and processing module, temperature sensing optical cable (1) lays in drainage pipe to laser to the laser production reverberation sensing signal of laser source, processing module is based on reverberation sensing signal obtains the temperature of temperature sensing optical cable (1) each point along the line, judges whether there is the leak source, and fixes a position the leakage position when there is the leak source.
2. The device for monitoring the leakage of the drainage pipe network based on the distributed optical fiber temperature measurement is characterized in that the temperature sensing optical cable (1) comprises a stainless steel seamless pipe and a sensing optical fiber arranged in the stainless steel seamless pipe, and factice is filled between the stainless steel seamless pipe and the sensing optical fiber.
3. The device for monitoring the leakage of the drainage pipe network based on the distributed optical fiber temperature measurement is characterized in that the sensing optical fiber is positioned in the center of the stainless steel seamless pipe.
4. The device for monitoring the leakage of the drainage pipe network based on the distributed optical fiber temperature measurement as claimed in claim 2, wherein the stainless steel seamless pipe is covered with an LSZH sheath for protection.
5. The device for monitoring the leakage of the drainage pipe network based on distributed optical fiber temperature measurement according to claim 2, wherein the laser source comprises a light source module (24) and a wavelength division multiplexing module (21), the processing module comprises a photoelectric conversion module (22) and a signal processing module (23), the light source module (24) is connected with the wavelength division multiplexing module (21), one end of the wavelength division multiplexing module (21) is connected with the temperature sensing optical cable (1), the other end of the wavelength division multiplexing module is connected with the photoelectric conversion module (22), and the photoelectric conversion module (22) is connected with the signal processing module (23).
The light source module (24) emits narrow-pulse-width laser pulses, the laser pulses are transmitted along the temperature sensing optical cable (1) after passing through the wavelength division multiplexing module (21), the laser pulses interact with optical fiber molecules to generate reflected light sensing signals in a Raman backscattering form, the wavelength division multiplexing module (21) is connected with the temperature sensing optical cable (1), Stokes light and anti-Stokes light components in Raman backscattering are separated from all scattered light, the photoelectric conversion module (22) converts optical signals into electric signals, the signal processing module (23) collects the electric signals and detects the variation of optical power through signal variation to obtain the temperature of each point along the temperature sensing optical cable (1), whether leakage points exist is judged, and the leakage positions are located when the leakage points exist.
6. The device for monitoring the leakage of the drainage pipe network based on the distributed optical fiber temperature measurement is characterized in that the processing module further comprises an alarm module (25), and the alarm module (25) is connected with the signal processing module (23).
7. The device for monitoring the leakage of the drainage pipe network based on the distributed optical fiber temperature measurement according to claim 5, wherein the light source module (24) is further connected with the signal processing module (23), and the position judgment process of the leakage point specifically comprises: and sending a first signal to the signal processing module (23) while sending the narrow pulse width laser pulse, calculating the time difference from sending the narrow pulse width laser pulse to receiving the Raman scattering signal according to the first signal, and determining the position of tap water leakage.
8. The device for monitoring the leakage of the drainage pipe network based on the distributed optical fiber temperature measurement is characterized in that the alarm module (25) comprises an audible and visual alarm and a short message alarm.
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Cited By (8)
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| CN112032576A (en) * | 2020-08-12 | 2020-12-04 | 临沂实康水务有限公司 | Distributed pipe network leakage monitoring device based on Raman temperature measurement |
| CN112903139A (en) * | 2021-02-04 | 2021-06-04 | 吴超烽 | Sewage traceability early warning research and judgment system and early warning research and judgment method thereof |
| CN112985638A (en) * | 2021-02-04 | 2021-06-18 | 吴超烽 | Sewage traceability system based on temperature and early warning method thereof |
| CN113029443A (en) * | 2021-03-22 | 2021-06-25 | 中国科学院上海光学精密机械研究所 | Ultra-deep underground wall leakage risk detection method based on distributed optical fiber sensing |
| CN113531403A (en) * | 2021-08-26 | 2021-10-22 | 三门核电有限公司 | Water pipe leakage detection method and device |
| CN113669637A (en) * | 2021-07-15 | 2021-11-19 | 安徽复盛信息科技有限公司 | Drainage pipeline monitoring system capable of realizing leakage point positioning based on distributed optical fiber |
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| CN116698112A (en) * | 2023-01-31 | 2023-09-05 | 三峡智慧水务科技有限公司 | Quantitative analysis method for mixing of sewage pipeline external water based on automatic temperature and water level monitoring data |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112032576A (en) * | 2020-08-12 | 2020-12-04 | 临沂实康水务有限公司 | Distributed pipe network leakage monitoring device based on Raman temperature measurement |
| CN112903139A (en) * | 2021-02-04 | 2021-06-04 | 吴超烽 | Sewage traceability early warning research and judgment system and early warning research and judgment method thereof |
| CN112985638A (en) * | 2021-02-04 | 2021-06-18 | 吴超烽 | Sewage traceability system based on temperature and early warning method thereof |
| CN113029443A (en) * | 2021-03-22 | 2021-06-25 | 中国科学院上海光学精密机械研究所 | Ultra-deep underground wall leakage risk detection method based on distributed optical fiber sensing |
| CN113029443B (en) * | 2021-03-22 | 2022-03-08 | 中国科学院上海光学精密机械研究所 | Ultra-deep underground wall leakage risk detection method based on distributed optical fiber sensing |
| CN113669637A (en) * | 2021-07-15 | 2021-11-19 | 安徽复盛信息科技有限公司 | Drainage pipeline monitoring system capable of realizing leakage point positioning based on distributed optical fiber |
| CN113669635A (en) * | 2021-07-19 | 2021-11-19 | 安徽复盛信息科技有限公司 | DVS optical fiber vibration sensing-based water supply pipeline leakage monitoring method |
| CN113531403A (en) * | 2021-08-26 | 2021-10-22 | 三门核电有限公司 | Water pipe leakage detection method and device |
| CN116698112A (en) * | 2023-01-31 | 2023-09-05 | 三峡智慧水务科技有限公司 | Quantitative analysis method for mixing of sewage pipeline external water based on automatic temperature and water level monitoring data |
| CN116698112B (en) * | 2023-01-31 | 2023-12-01 | 三峡智慧水务科技有限公司 | Quantitative analysis method for mixing of sewage pipeline external water based on automatic temperature and water level monitoring data |
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