CN211477522U - Leakage distributed optical fiber detection system for acidic medium conveying pipeline - Google Patents
Leakage distributed optical fiber detection system for acidic medium conveying pipeline Download PDFInfo
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- CN211477522U CN211477522U CN201921929836.4U CN201921929836U CN211477522U CN 211477522 U CN211477522 U CN 211477522U CN 201921929836 U CN201921929836 U CN 201921929836U CN 211477522 U CN211477522 U CN 211477522U
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Abstract
The utility model relates to an acid medium pipeline leaks distributed optical fiber detection system, including the optical module, the optical fiber ring, photoswitch, the detection optical cable, data acquisition card, signal processing system, the optical module produces the pulse emission signal, the pulse emission signal gets into the detection optical cable through optical fiber ring and photoswitch, the detection optical cable is arranged along the pipeline axial, the pulse emission signal of transmission can produce the scattered signal backward in the detection optical cable, the scattered signal is received by the optical module again and is converted into the signal of telecommunication and is gathered by data acquisition card, signal processing system and data acquisition card communication, demodulate the temperature change information after reacting with acid medium on the detection optical cable with the signal change. The detection optical cable has the self-sensing characteristic of the acid solution, when the conveying pipeline leaks, the leaked acid solution reacts with the detection optical cable to release heat, the temperature of the leakage position is increased, the leakage event is detected according to the characteristic that the scattering signal of the leakage point is sensitive to the temperature, and the detection optical cable has the advantages of sensitivity and accuracy.
Description
Technical Field
The utility model relates to a distributed optical fiber sensing detecting system especially relates to a distributed optical fiber heat sensing detecting system based on acid corrosion is exothermic, and is used for the detection of acid medium pipeline leakage.
Background
The pipeline for transporting corrosive media is easy to corrode and fatigue after being used for a long time, and once pipeline leakage accidents occur, especially leakage of the pipeline for transporting acid and alkali media, not only is loss brought to pipeline transportation, but also the surrounding environment and life and property are threatened. Therefore, the conveying information of the corrosive medium conveying pipeline is mastered in real time, precaution is achieved, leakage accidents occurring on the conveying pipeline are detected in time, and the method and the device are very important for guaranteeing safe and efficient operation of the conveying pipeline.
Distributed Temperature measurement (DTS) has been widely studied and applied in practical engineering, especially in thermal pipeline leakage monitoring, due to its advantages of high spatial resolution, high measurement accuracy, long Sensing distance, etc. However, the distributed optical fiber temperature measurement technology can only be used for leakage detection of a thermal pipeline at present, and research results are relatively few for application of leakage detection of a normal-temperature medium conveying pipeline.
The patent document with the publication number of CN108955938A discloses a distributed optical fiber temperature measuring device for a normal temperature conveying pipeline, which comprises a conveying pipeline for conveying a normal temperature medium, a temperature sensing optical cable and a heating bag which are laid in parallel with the conveying pipeline and are positioned below the conveying pipeline, and an external pipeline for sealing the conveying pipeline, the temperature sensing optical cable and the heating bag in a closed space, wherein the temperature sensing optical cable is connected with a DTS host, and the heating bag is a passive heat source.
Although above-mentioned scheme can detect normal atmospheric temperature medium solution pipeline's leakage, can't distinguish the medium kind, and need additionally set up the heating package, the cost is high, and the problem that heating package itself also has sealed inefficacy arouses the wrong report easily. Is difficult to popularize and apply.
SUMMERY OF THE UTILITY MODEL
Leak testing to acid medium pipeline, the utility model discloses a special optical cable sensitive to normal atmospheric temperature acid medium has been developed, has developed a distributing type optical fiber sensing detecting system based on this, and this system adopts distributing type optical fiber sensing technique, realizes obviously reducing the misstatement rate to the effective accurate detection of leakage point.
The utility model provides a technical scheme that above-mentioned problem adopted does: a distributed optical fiber detection system for leakage of an acidic medium conveying pipeline comprises an optical module, an optical fiber ring, an optical switch, a detection optical cable, a data acquisition card and a signal processing system, wherein the optical module generates a pulse emission signal, the pulse emission signal enters the detection optical cable through the optical fiber ring and the optical switch, the detection optical cable is arranged along the axial direction of the conveying pipeline, the pulse emission signal transmitted in the detection optical cable can generate a scattering signal backwards, the scattering signal is received by the optical module again through the optical switch and the optical fiber ring and is converted into an electric signal, the electric signal is acquired by the data acquisition card, and the signal processing system is communicated with the data acquisition card and demodulates the signal change into temperature change information on the detection optical cable.
Preferably, the optical module comprises a pulse laser for generating a pulse transmission signal; a wavelength division multiplexer; a photodetector; the pulse laser is connected with the optical fiber ring through the wavelength division multiplexer; the photoelectric detector is connected with the wavelength division multiplexer, and the data acquisition card is connected with the photoelectric detector. The integrated circuit has the advantages of high integration level, small size, long-term reliability and stability.
Preferably, the optical fiber ring is a reference optical fiber ring which is formed by winding a plurality of circles of optical fibers on a circular ring metal support according to a quadrupole symmetric winding method, so that the temperature measurement influence of the uneven stress change caused by the thermal expansion and cold contraction of a framework or the optical fibers on the optical fiber ring is reduced, the temperature self-calibration precision of the system is improved, and the optical fiber ring is widely applied to the field of polarization-maintaining optical fiber rings at present.
Preferably, the system further comprises an electronic temperature sensor arranged on the optical fiber ring; the optical switch integrates an optical channel switching control circuit and a temperature acquisition circuit of the electronic temperature sensor, and is communicated with a signal processing system through a serial port to realize real-time temperature measurement of the optical fiber ring and switching of the optical channel.
The detection optical cable in this application outside-in includes oversheath, reinforcement, pine sleeve pipe and fibre core in proper order, the oversheath can release heat with sour reaction and make the local intensification of reaction position, and this is the important temperature sense mechanism of this application detection optical cable.
Optionally, the reinforcement is a plurality of aramid yarns wrapped around the outer wall of the loose tube.
Optionally, the core is composed of 1-2 62.5/125 or 50/125 multimode fibers.
The outer sheath is prepared from raw materials including a base body, an alkaline filler and a color master batch, wherein the base body is nylon or polyether-ether-ketone, the alkaline filler is magnesium hydroxide and/or aluminum hydroxide, and the color master batch is carbon black.
The method for detecting the leakage of the acidic medium conveying pipeline based on the detection system comprises the following steps: arranging the detection optical cable along the length of the conveying pipeline, and if a sleeve joint is arranged between two sections of conveying pipelines, respectively winding the detection optical cable for one circle at two ends of the sleeve joint, so that when the conveying pipeline leaks, the detection optical cable contacts and reacts with leaked acidic media at a leakage position and releases heat, and the optical cable at the leakage position is locally heated; after a detection system is started, a pulse laser inside an optical module generates a laser pulse signal on a sending end, the laser pulse signal is transmitted to an optical fiber ring and an optical switch in sequence through a wavelength division multiplexer, the optical switch is a 1 xN branching unit and is used for distributing the laser pulse signal to N channels, each channel is connected with a detection optical cable, and the laser pulse signal enters the detection optical cable for transmission; on the receiving end, a laser pulse signal transmitted in a detection optical cable can generate a backward Raman scattering spectrum signal, the backward Raman scattering spectrum signal is transmitted back to an optical switch and an optical fiber ring, then is divided into a Stokes light signal with the wavelength larger than that of an incident laser pulse and an anti-Stokes light signal with the wavelength smaller than that of the incident laser pulse by a wavelength division multiplexer, the Stokes light signals are converted into electric signals by a photoelectric detector respectively, then the data of the two electric signals are collected by a data collection card and finally transmitted to a signal processing system, and the signal processing system performs the following signal processing:
receiving backward Raman scattering spectrum signal, and extracting anti-Stokes light signal intensity value IasAnd Stokes light signal intensity value IsSince the Stokes light propagates faster in the optical fiber than the anti-Stokes light, the same position on the optical fiber cableThe returned anti-Stokes light lags behind the Stokes light and passes through a dispersion compensation algorithm
Processing the Stokes light intensity signal in backward scattering, wherein Is(l) For the intensity value of Stokes at the length L of the cable, △ L is the distance difference between the Fresnel reflection peaks of Stokes light and anti-Stokes light, LasThe fresnel reflection peak position for the anti-stokes light; the two processed beams are respectively filtered by adopting a modulus maximum algorithm of wavelet analysis, the sensitivity of the anti-Stokes light to the temperature is far greater than that of the Stokes light, so that the temperature value at the leakage point is linearly demodulated by utilizing the anti-Stokes and Stokes light intensity ratio after loss compensation, and the temperature difference threshold T is setthAnd inspecting the temperature change rate to judge whether a leakage event exists or not and sending leakage point alarm information; in addition, the time of the backward Raman scattering spectrum signal at the leakage position returning to the incident end and the propagation speed in the optical fiber are used for solving the transmission distance of the backward Raman scattering spectrum signal, and then the position of the leakage occurring on the detection optical cable is solved.
The utility model discloses a can detect acidic medium pipeline with the detection optical cable of acid solution reaction and leak, sensitivity is high, and the misstatement rate is low, and the detection degree of accuracy is high. The system adopts the optical module integrating signal generation and signal reception and the optical fiber ring wound by the quadrupole symmetric winding method, thereby improving the stability of the system. The distributed optical fiber temperature measurement method is adopted to demodulate the temperature change information of the leakage point, and online real-time leakage monitoring and accurate positioning of the whole pipeline can be realized.
Drawings
Fig. 1 is a schematic structural diagram of the distributed optical fiber detection system of the present invention;
FIG. 2 is a schematic diagram of the distributed optical fiber detection system of the present invention;
FIG. 3 is a schematic cross-sectional view of a detection cable according to the present invention;
FIG. 4 is a diagram illustrating the effect of wavelet filtering in the method for detecting leakage of an acidic medium conveying pipeline according to an embodiment of the present invention;
fig. 5 is a temperature variation curve diagram of a leakage point in the method for detecting leakage of an acidic medium conveying pipeline according to the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawing, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Referring to fig. 1-2, the present embodiment relates to a distributed optical fiber detection system for detecting leakage of an acidic medium conveying pipeline, which includes an integrated optical module 1, an optical fiber ring 2, an optical switch 3, a detection optical cable 4, a data acquisition card 7, and a signal processing system 8, where the signal processing system 8 is installed in a computer host. The integrated optical module 1 is internally integrated with a high-speed narrow-band Raman laser source with the repetition frequency of 10KHz, a Wavelength Division Multiplexer (WDM) and an InGaAs-APD detector. The optical fiber ring 2 is a reference optical fiber ring formed by winding a plurality of circles of optical fibers with the length of 160 meters on the circular ring metal support according to a quadrupole symmetric winding method, so that the influence of nonuniform stress change caused by thermal expansion and cold contraction of a framework or the optical fibers on the temperature measurement of the optical fiber ring is reduced, and the temperature self-calibration precision of the system is improved. The optical switch 3 is a 1 × 4 mechanical optical switch, and can realize time-sharing output of signals on 4 channels by switching the optical switch, and the optical switch 3 is internally integrated with an optical channel switching control circuit 301 and an acquisition circuit 302 of an electronic temperature sensor (DS18B20), wherein the electronic temperature sensor is arranged on the optical fiber ring 2 and is used for acquiring the real-time temperature of the optical fiber ring 2. The optical channel switching control circuit 301 and the acquisition circuit 302 of the electronic temperature sensor (DS18B20) perform data transmission and control with the signal processing system through a serial port, so as to realize real-time temperature measurement of the reference optical fiber ring and switching of the optical channel.
On a transmitting end, a laser pulse signal with 1550nm wavelength and 10ns pulse width is generated by the integrated optical module 1, the laser pulse signal passes through the optical fiber ring 2 and the optical switch 3 respectively, the optical switch 3 is a 1 x 4 splitter and can divide the pulse signal into 4 channels, each channel is connected with the detection optical cable 4 by a flange, and the detection optical cable is laid along the axial direction of the pipeline 5 to be detected; on a receiving end, a laser pulse signal transmitted in a detection optical cable 4 can generate a back scattering Raman signal, the back scattering Raman signal is reversely transmitted back to the optical switch 3 and the optical fiber ring 2, the back scattering Raman signal is divided into an anti-Stokes optical signal with the wavelength of 1450nm and a Stokes optical signal with the wavelength of 1663nm by a wavelength division multiplexer inside the integrated optical module 1, the anti-Stokes optical signal and the Stokes optical signal are received by a high-speed avalanche diode (InGaAs-APD) inside the integrated optical module 1 and then converted into electric signals, the electric signals are amplified by an amplifying circuit and then are transmitted to a signal processing system 8 for analysis, data are acquired by an acquisition card 7 with the sampling rate of 100MHz, and finally the data are transmitted to the signal processing system 8 for analysis, and the temperature.
As shown in fig. 3, the detection optical cable 4 is composed of an outer sheath 401, a strength member 402, a loose tube 403 and a fiber core 404, the outer sheath 401 is a material which can be dissolved by 17% hydrochloric acid solution by mass, and is composed of nylon PA6, magnesium hydroxide, aluminum hydroxide and a small amount of color master batch, the magnesium hydroxide and the aluminum hydroxide are 20-30 wt% of nylon PA6, and the color master batch is 0.8-2 wt% of nylon PA 6. The outer sleeve 401 can react rapidly to release heat after contacting with a hydrochloric acid solution with a concentration of more than 17 wt%, so that the local temperature rises by more than 5 ℃ and does not react with the hydrochloric acid solution with a concentration of less than 10 wt%. The reaction is strong in pertinence and is not easily interfered by the environment. The reinforcing piece is composed of 1-2 aramid yarns, and the fiber core is composed of 1-2 multimode fibers of 62.5/125 or 50/125.
With reference to fig. 1, fig. 3 and fig. 4, the present invention relates to a distributed optical fiber detection method for detecting leakage of an acid solution delivery pipeline, which comprises the following steps:
(1) firstly, the detection optical cable 4 is placed under the pipeline 5 to be detected and is bound by a binding belt, the detection optical cable 4 is wound by a circle at two ends of the sleeve joint 6 part of the pipeline to be detected, and the sleeve joint part is easy to leak.
(2) When the pipeline leaks, the detection optical cable 4 is in contact with an acid solution flowing out of a leakage point, the outer sheath is dissolved by the acid solution, so that internal reactants (magnesium hydroxide and aluminum hydroxide) and the acid solution are subjected to chemical reaction and release heat, the optical cable in the region is heated to raise the temperature, the signal processing system 8 receives the backward Raman scattering spectrum signal, and an anti-Stokes light signal intensity value I is extractedasAnd Stokes light signal intensity value Is。
(3) Since the Stokes light propagates faster in the optical fiber than the anti-Stokes light, the anti-Stokes light obtained at the same distance on the optical cable will lag behind the Stokes light, and needs to pass through a compensation algorithm
Processing the backscattered Stokes light intensity signal, wherein Is(l) For the intensity value of Stokes at the length L of the cable, △ L is the distance difference between the Fresnel reflection peaks of Stokes light and anti-Stokes light, LasThe position of the fresnel reflection peak for the anti-stokes light.
(4) The two processed beams are respectively filtered by sym4 wavelet base, a mode maximum threshold is arranged on the 4 th layer of the wavelet decomposition layer to filter noise, the threshold can be adjusted according to the length of the detection optical cable 4, and the sensitivity of the anti-stokes light to the temperature is far greater than that of the stokes light, so that the temperature value at the leakage point is linearly demodulated by using the light intensity ratio of the anti-stokes light to the stokes light after loss compensation.
(5) Finally, the position of the leakage point is solved based on an Optical Time Domain Reflectometer (OTDR), namely, the transmission distance of the scattered light is solved by utilizing the time of the scattered light at the leakage point returning to the incident end and the propagation speed of the scattered light in the optical fiber, and meanwhile, a temperature difference threshold (T) is setthWhether acid solution leakage incident exists is judged in the mode of 5 ℃) and temperature change rate (being more than or equal to 4 ℃/min) and leakage point alarm information is sent, and after the leakage incident occurs, a section of new detection optical cable can be welded again to continue detection when the pipeline position is changed.
The utility model relates to a distributed optical fiber sensing device and detection method for acid solution pipeline leak testing, concrete implementation effect is as shown in fig. 5, soaks the position of 10 meters in the middle of one section 200 meters long detection optical cable in the simulation of quality fraction is 17% hydrochloric acid solution and leaks, and the detection optical cable that detects has risen 6 ℃ in the temperature of leak department, according to a distributed optical fiber detection method for acid solution pipeline leak testing, can detect the leak position fast, accurately.
Although the preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A leakage distributed optical fiber detection system for an acidic medium conveying pipeline is characterized in that: the optical fiber detection device comprises an optical module (1), an optical fiber ring (2), an optical switch (3), a detection optical cable (4), a data acquisition card (7) and a signal processing system (8), wherein the optical module (1) generates a pulse emission signal, the pulse emission signal passes through the optical fiber ring (2) and the optical switch (3) to enter the detection optical cable (4), the detection optical cable is arranged along the axial direction of a conveying pipeline, the pulse emission signal transmitted in the detection optical cable can generate a scattering signal backwards, the scattering signal passes through the optical switch (3) and the optical fiber ring (2) and is received by the optical module (1) again and converted into an electric signal, the electric signal is acquired by the data acquisition card (7), and the signal processing system (8) is communicated with the data acquisition card (7) and demodulates the signal change into temperature change information on the detection optical cable.
2. The distributed optical fiber detection system for leakage of acidic medium conveying pipeline according to claim 1, characterized in that: the optical module (1) comprises a pulse laser for generating a pulse emission signal; a wavelength division multiplexer; a photodetector;
the pulse laser is connected with the optical fiber ring (2) through the wavelength division multiplexer;
the photoelectric detector is connected with the wavelength division multiplexer, and the data acquisition card (7) is connected with the photoelectric detector.
3. The distributed optical fiber detection system for leakage of acidic medium conveying pipeline according to claim 1, characterized in that: the optical fiber ring (2) is a reference optical fiber ring which is formed by winding a plurality of circles of optical fibers on a circular ring metal support according to a quadrupole symmetrical winding method.
4. The distributed optical fiber detection system for leakage of acidic medium conveying pipeline according to claim 1, characterized in that: the system also comprises an electronic temperature sensor (9), wherein the electronic temperature sensor (9) is arranged on the optical fiber ring (2);
the optical switch (3) integrates an optical channel switching control circuit (301) and a temperature acquisition circuit (302) of the electronic temperature sensor (9), and is communicated with the signal processing system (8) through a serial port to realize real-time temperature measurement of the optical fiber ring (2) and switching of the optical channel.
5. The distributed optical fiber detection system for leakage of acidic medium conveying pipeline according to claim 1, characterized in that: the detection optical cable (4) comprises an outer sheath (401), a reinforcing piece (402), a loose tube (403) and a fiber core (404) from outside to inside in sequence, and the outer sheath can react with acid to release heat so as to locally raise the temperature of a reaction position.
6. The distributed optical fiber detection system for leakage of acidic medium conveying pipeline according to claim 5, characterized in that: the reinforcing piece (402) is a plurality of aramid yarns wound on the outer wall of the loose tube.
7. The distributed optical fiber detection system for leakage of acidic medium conveying pipeline according to claim 5, characterized in that: the fiber core (404) is composed of 1-2 62.5/125 or 50/125 multimode fibers.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116677928A (en) * | 2023-08-03 | 2023-09-01 | 苏芯物联技术(南京)有限公司 | Intelligent detection method for welding protection gas pipeline leakage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116677928A (en) * | 2023-08-03 | 2023-09-01 | 苏芯物联技术(南京)有限公司 | Intelligent detection method for welding protection gas pipeline leakage |
| CN116677928B (en) * | 2023-08-03 | 2023-10-10 | 苏芯物联技术(南京)有限公司 | Intelligent detection method for welding protection gas pipeline leakage |
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Effective date of registration: 20211029 Address after: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Patentee after: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Address before: 214400 No.278 Chengjiang Middle Road, high tech Zone, Jiangyin City, Wuxi City, Jiangsu Province Patentee before: JIANGSU FASTEN OPTOELECTRONICS TECHNOLOGY Co.,Ltd. Patentee before: JIANGSU FASTEN OPTICAL COMMUNICATION TECHNOLOGY Co.,Ltd. Patentee before: FASTEN GROUP Co.,Ltd. |