CN102997053A - System for measuring propagation speed of natural gas pipe leakage vibration wave - Google Patents
System for measuring propagation speed of natural gas pipe leakage vibration wave Download PDFInfo
- Publication number
- CN102997053A CN102997053A CN201110272063.9A CN201110272063A CN102997053A CN 102997053 A CN102997053 A CN 102997053A CN 201110272063 A CN201110272063 A CN 201110272063A CN 102997053 A CN102997053 A CN 102997053A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- light path
- signal
- output
- optical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000003345 natural gas Substances 0.000 title claims abstract description 29
- 239000013307 optical fiber Substances 0.000 claims abstract description 95
- 230000003287 optical effect Effects 0.000 claims abstract description 60
- 238000012545 processing Methods 0.000 claims abstract description 27
- 239000000835 fiber Substances 0.000 claims description 51
- 239000003990 capacitor Substances 0.000 claims description 30
- 230000005540 biological transmission Effects 0.000 claims description 27
- 229920001971 elastomer Polymers 0.000 claims description 24
- 238000012544 monitoring process Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 17
- 239000000806 elastomer Substances 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000005755 formation reaction Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 230000001427 coherent effect Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229940085805 fiberall Drugs 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 8
- 239000000523 sample Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000000644 propagated effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000001953 sensory effect Effects 0.000 description 1
Images
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a system for measuring propagation speed of natural gas pipe leakage vibration wave. The system comprises two parts, i.e. an optical path system and a circuit, wherein an optical fiber sensing unit is arranged on a pipe body every certain interval; a plurality of optical fiber sensing units form an optical fiber sensor group; after being serially connected to a beam splitter in an optical fiber through an optical fiber, each optical fiber sensor group is connected with a light source and a photoelectric detector at a receiving end; the output of the photoelectric detector is connected with a signal acquiring and processing module which has leakage signal identifying and event positioning functions; the signal acquiring and processing module comprises a signal conditioner, a signal acquisition device, a processing unit, a terminal displayer and an external interface; the output of the signal conditioner connected with the output of the photoelectric detector is sequentially and serially connected with the signal acquisition device and the processing unit; the output of the processing unit is connected with the terminal displayer and the external interface; and the output of the signal acquiring and processing module is connected with a microcomputer. The system is high in sensitivity and accuracy, and low in false alarm rate and is not easily affected by environmental factors.
Description
Technical field
The present invention is a kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage, relates to the measurement of mechanical vibration, measurement and the pipe-line system technical field of impact.
Background technique
At present, the pipeline overall length of building up in the world reaches 2,500,000 kilometers, and having surpassed the railway total kilometrage becomes the main means of transportation of world energy sources, and the oil product of developed country and oil-producing area, the Middle East transports all realizes channelization.China's pipeline has also obtained very fast development in recent years, overall length is also above 70,000 kilometers, begun to take shape across thing, stretch from the north to the south, cover the whole nation, be communicated with the overseas large general layout of energy pipe network, pipeline transport becomes the major way of the allotment conveying of the strategic energy such as oil gas.
Pipeline is subjected to the reasons such as natural disaster, third party's breakage in installation owing to cross-regional wide, has caused more pipe leakage accident to occur.External pipe safety situation also allows of no optimist very much, and the natural gas line big bang occurs in U.S. San Bruno city on September 9th, 2010, and blast causes long 51 meters, wide 9 a meters hollow place on the road surface.The pipeline of about 8 meters of one segment length, 76 centimetres of diameters is exploded the Heaven, flies out about 30 meters far away, and causes large-range fire disaster, causes 4 people dead, and 3 people are missing, and at least 52 people are injured, 4 hectares of burnt areas, and tens of houses are burnt.People's safety, environmental consciousness significantly promote in recent years, are also more and more paid attention to as the pipeline transportation safety problem of high risk industries.
Only have the sound wave monitoring method comparatively effective for natural gas line leakage in the ripe technology at present, but in order to improve the real-time of leakage monitoring and the accuracy of leak source location, the layout density that must add at pipeline large sensor, increase simultaneously corresponding power supply, communications equipment, cause system cost and installation and maintenance costly.
Along with the development of sensory technique has been carried out the research of SCADA leakage monitoring system such as companies such as U.S. CSI, ATMOSI, European TER abroad, Sensornet company has also developed the leakage monitoring system based on distributed optical fiber temperature sensor, and portioned product has also been applied for patent protection at home; The units such as domestic University Of Tianjin, Tsing-Hua University, China Renmin People's Liberation Army Office Support Engineering Academy also further investigate the leakage monitoring method of pipeline.
Patent CN200410020046.6 discloses a kind of distribution type fiber-optic method for monitoring leak from oil gas pipe and monitoring device based on principle of interference.This monitoring system requires to lay side by side an optical cable at Near Pipelines along pipeline, utilizes the optical fiber in the optical cable to form a Fiber optic micro-vibration sensor.Patent CN200620119429, CN200610113044.0 are the pipeline leakage monitor based on the Sagnac fibre optic interferometer, and patent CN200610072879.6 is a kind of pipeline leakage monitor based on distributed optical fiber acoustic sensing technology and method.
" sensor and micro-system " the 7th phase of the 26th volume " based on the gas pipeline leakage detection method of distributed fiberoptic sensor " discloses a kind of gas pipeline leak detecting device and method based on distributed fiberoptic sensor, it is to have installing optical fibres sensor on the pipeline body of certain intervals, the vibration wave signal that continuous real-time monitoring is propagated along pipeline body, the vibration wave signal that gathers is carried out analysing and processing, comprise type identification and vibration source location, wherein whether type identification is for to belong to leak type by the extraction and analysis of vibration wave feature being differentiated it, the time lag that simultaneously propagates into adjacent several optical fiber transducers according to vibration wave determines that in conjunction with the velocity of propagation of vibration wave on pipeline body the position at vibration wave source place, the light intensity signal of sensor output realize position definite of leakage point after photoelectric conversion.
CN1837674A discloses a kind of pipeline leakage testing device and method based on distributed optical fiber acoustic sensing technology.
US2006/0225507A1 discloses a kind of pipeline leakage testing device and method based on distributed fiberoptic sensor.
Above-mentioned technology all belongs to the distributed optical fiber sensing monitoring method.But such technical monitoring is subject to the impact of the interference incident that pipeline occurs when leaking, have very high system's false alarm rate, and antijamming capability is relatively poor.Have very high system's false alarm rate and measure system as the pipe leakage vibration wave velocity of propagation in the distributed optical fiber sensing monitoring system, antijamming capability is relatively poor.
Summary of the invention
The objective of the invention is to invent the sensitivity of the quasi-distributed leakage vibration monitor system of a kind of high sensitivity based on Fibre Optical Sensor and degree of accuracy is high, false alarm rate is low, the system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage that is not subject to such environmental effects.
Low in view of the sensitivity that above-mentioned a few class Leak testtion, monitoring technology exist, false alarm rate is high, be subject to the problem such as such environmental effects, the present invention is the natural gas line leakage system that uses based on the quasi-distributed optical fiber interference sensing technology, namely adopt the high sensitivity sensing unit and in conjunction with time domain, the frequency domain character of incident of leakage, measure leaking the vibration wave velocity of propagation.
This measuring vibration wave propagation velocity in case of natural gas pipeline leakage method is to be based upon on the basis of natural gas line leakage method of Fibre Optical Sensor; Use the natural gas line leakage system, select some known sensing unit points to cause vibration by knocking the form simulation pipe leakages such as pipeline, quantity according to the pipe section that uses in engineering construction and the examination data, the leakage signal that propagates into two adjacent sensing units is carried out that time delay is estimated and realized leaking the mensuration of vibration wave speed in conjunction with known duct length, accurately provide the distance of two adjacent sensing unit points of current test point distance, with this simulation test point position X substitution: X=L-[v * (t
N+2-t
n)]/2, counter solving: v=2 (L-X)/(t
N+2-t
n), realize measuring vibration wave along the speed of pipe transmmision according to the signal propagation time of known sensing unit span and mensuration.L is two distances between the adjacent sensing unit point in the formula; X is the distance apart from first sensing unit point (apart from starting point), and v leaks the vibration velocity of wave propagation.
The common communications optical fibre in optical cable of utilization and oil and gas pipes laying in one ditch is respectively as the sending and receiving transmission fiber, pipeline is revealed optical fiber sensing probe to be connected between the transmitting-receiving transmission fiber by Optical multiplexing technology is parallel with one another, form light circuit, it is along the line that pipeline leakage optical fiber sensing probe evenly is laid in pipeline, but form the optical fiber sensing system of monitoring pipe road acoustic vibration.Utilize light source that each pipeline is revealed optical fiber sensing probe scanning, reveal photoelectric conversion signal demodulation, the extraction of distribution situation to gathering of optical fiber sensing probe according to pipeline, the vibration information of realizing each pipeline leakage optical fiber sensing probe obtains, the detection analysis conduit is revealed the optical fiber sensing probe signal and has been judged whether that pipeline leakage event occurs, and reveals the mensuration that optical fiber sensing probe detects the time delay of arrival realization pipe leakage vibration wave velocity of propagation of signal according to adjacent pipeline.
This system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage is to melt based in the natural gas line leakage system of Fibre Optical Sensor.So this system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage just is based on the natural gas line leakage system of Fibre Optical Sensor.
Formation based on the natural gas line leakage system of Fibre Optical Sensor is seen Fig. 1, and it comprises light path system and circuit two-part; A Fibre Optical Sensor unit is installed on pipeline body at a certain distance, optical fiber transducer group of a plurality of Fibre Optical Sensor cell formations, each optical fiber transducer group connects behind the beam splitting apparatus that is serially connected in the optical fiber light source and the photodetector of receiving terminal with an optical fiber, photodetector output connects signals collecting and the puocessing module that comprises leakage signal identification and state event location function, and described signals collecting and puocessing module comprise that signal conditioner, signal picker, processing unit, terminal show and external interface; The signal conditioner output that connects photodetector output is connected in series signal picker and processing unit successively, and processing unit output has terminal to show and external interface.Signals collecting and puocessing module output connect microcomputer.Through the processing of signals collecting and puocessing module, the sensor group signal that mixes based on the frequency division multiplexing mode has been realized the demultiplexing of each sensor in the sensor group, obtains original leakage vibration wave signal.
Send laser by light source, after the transmission light path realizes beam splitting, part light is transferred to the optical fiber transducer group that is installed on the tube wall, the optical fiber transducer group is picked up behind the leakage oscillating signal and noise of pipe transmmision, again be transmitted back to the photodetector of system through the transmission light path, carry out leakage signal demodulation and discriminance analysis by signals collecting and puocessing module, and leakage signal is carried out time delay estimate that realization is to the location of leakage point.
The light path system of this natural gas line leakage system (seeing Fig. 4) mainly is based on the frequency division multiplexing principle and designs, and is made of light path ABAP Adapter, transmission cable and Fibre Optical Sensor unit three parts; The light path ABAP Adapter is comprised of beam splitter and combiner device; The Fibre Optical Sensor unit adopts Mach-Zehnder interferometer or Michelson interferometer; Each optical fiber transducer connects a light path ABAP Adapter by two optical fiber, and all light path ABAP Adapter are connected in series successively, by the nearest light path ABAP Adapter welding system main frame of distance receiving terminal.
After entering the sensing unit group, input optical fibre in the exploring laser light input transmission cable that laser sends arrives first light path ABAP Adapter, be divided into two bundle laser by the beam splitter of this light path ABAP Adapter: a branch ofly enter first Fibre Optical Sensor unit through input optical fibre, light beam passes to next light path ABAP Adapter through time delay optical fiber in addition, be divided into two bundle laser by the beam splitter in the next light path ABAP Adapter again, a branch ofly enter second Fibre Optical Sensor unit, another Shu Zaijing transmission fiber is transferred to next light path ABAP Adapter, by that analogy, until laser arrives last Fibre Optical Sensor unit; Every 2-10 adjacent optical fiber transducer is divided into one group, and the interference signal of each optical fiber transducer transfers back to system receiving terminal by combiner device access passback optical fiber in the group; In last Fibre Optical Sensor unit of sensing unit group, laser no longer by the light path ABAP Adapter, directly enters the Fibre Optical Sensor unit; And through the optical signal behind each Fibre Optical Sensor unit, the combiner device by in the corresponding light path ABAP Adapter separately passes the optical signal of coming with the back and closes bundle, finally reaches the photoelectric conversion module of monitoring system through output optical fibre.
Wherein, the light path ABAP Adapter has been gathered beam splitter and combiner device; Input optical fibre and output optical fibre use is two different fibre cores in the same transmission cable; Transmission cable is together in series all light path ABAP Adapter; The length of the launching fiber on the pipeline between adjacent two sensing units and passback optical fiber all is greater than 1/2 of laser coherent length, to prevent that signal cross-talk occurs between the sensing unit.
Specifically linking as shown in Figure 5 between each optical member in the described light path system, it is made of light path ABAP Adapter, transmission cable and optical fiber transducer three parts; The light path ABAP Adapter is comprised of beam splitter and combiner device; Optical fiber transducer adopts Mach-Zehnder interferometer or Michelson interferometer; The beam splitting apparatus I 1 that the leak detection light that light source sends enters in the light path ABAP Adapter through transmission fiber I 5, it is 24: 1 that this beam splitting apparatus I 1 adopts splitting ratio, wherein ratio is that 24 output light continues to propagate along time delay optical fiber 4, until light path ABAP Adapter 2, and export ratio to be 1 output light enter first sensing unit 2 through connecting optical fiber, sensing unit 2 adopts the Mach-Zehnder interferometer structure, poor at 20m in order to guarantee that sensing unit has certain sensitivity control interferometer arm, this interferometer is wound on the elastomer of rubber material, elastomer is close to tube wall, adopts protective housing to fix; Between each sensing unit apart from Accurate Measurement, according to the output of light propagation time control light source; Beam splitting apparatus 1 in the light path ABAP Adapter 2 adopts 23: 1 splitting ratio, wherein ratio is that 23 output light continues to propagate until run into next light path ABAP Adapter along input optical fibre, and export ratio to be 1 output light enter second sensing unit 2 through connecting optical fiber, it is poor at 20m that this sensing unit adopts equally the Mach-Zehnder interferometer structure and controls interferometer arm, be wound on the elastomer of rubber material, elastomer is close to tube wall and is fixed; When the pipeline between first and second sensing unit 2 occurs to leak, leaking the vibration wave that causes is picked up by two sensing units respectively through the regular hour along pipe transmmision, import system's photoelectric conversion module into by transmission fiber 5, final system receives the time difference of leakage signal and the location that can realize leakage point in conjunction with vibration wave in ducted velocity of propagation according to sensing unit;
The optical signal that is returned by the monitoring light path at first enters in the photodetector of system, carry out photoelectric conversion, the entering signal acquisition processing module is processed afterwards, its process is: at first carry out signal condition through conditioning circuit, then gather through the A/D collector, then send into signal processing unit and carry out signal filtering and demodulation process, obtain original leakage vibration wave signal, at last leakage signal is carried out signal identification and positioning analysis, and analysis result is shown in terminal, the signal acquisition process module principle is as shown in Figure 6;
Described light source is a kind of special light source system that is fit to multiplexing and modulation /demodulation that comprises, laser and the dedicated modulation signal generating module adjustable by optical frequency consist of (seeing Fig. 2); The laser input connects the D/A follower in the modulation signal generation module, and the D/A follower connects signal generator, and signal generator has frequency adjustment, amplitude adjusted and the sawtooth wave/selection of falling sawtooth wave input; Can select such as sawtooth wave or the signal type of falling the saw wave modulator by programming, adjust signalization amplitude and frequency; Modulation signal acts on laser, and the output optical frequency is input in the sensing light path with the laser that the modulation signal synchronous waveform changes, and realizes multiplexing, the signal carrier that forms a plurality of sensing units of sensing unit;
Wherein laser adopts the semiconductor laser that optical frequency can be modulated, and modulation signal acts on the laser Injection Current, realizes the modulation of optical frequency; Laser optical power 1-17mW, the laser coherent length is poor greater than all the sensors interferometer brachium, but the delay fiber lengths sum less than on launching fiber between adjacent two interferometers and the passback optical fiber can satisfy the requirement that postpones optical fiber between poor and adjacent two the sensor interferometer instrument of sensor interferometer instrument arm;
Wherein modulation signal generation module adopts digital form to realize, namely calculate the modulation signal segment that obtains one-period by digital form according to wave mode, signal amplitude, frequency parameter, then export by digital-to-analog conversion (D/A) mode, the modulated-analog signal of output is connected on the laser, wherein can select such as sawtooth wave or the signal type of falling the saw wave modulator capable of regulating signalization amplitude, direct current biasing and frequency by parameter configuration; Sawtooth wave or the requirement of falling the sawtooth signal amplitude of the output of modulation signal generation module are to the maximum ± 5V, and frequency is 200KHz to the maximum; Laser after modulation output optical frequency is input in the sensing light path with the laser that the modulation signal synchronous waveform changes, and can realize multiplexing, the signal carrier that forms a plurality of sensing units of sensing unit;
Wherein the modulation of source circuit as shown in Figure 3, it is mainly by operational amplifier U7, Distributed Feedback Laser U8, operational amplifier U9 and 2 triode Q4, Q5 groups; The 7 termination VDC of U7, connect again with the circuit of capacitor C 38 parallel connections after connecting with diode D8, capacitor C 41 behind the 6 terminating resistor R18, meet VDC behind the 6 terminating resistor R19, connect again simultaneously the ground that is connected in series to of diode D4, D5, D6, D7,4,7,8,9,10 end ground connection, 3 ends are ground connection after resistance R 17,2 ends and the end that meets U8; 1, the 14 end ground connection of U8,12 ends are through capacitor C 34 ground connection, 5,11 termination VDC, 4 termination PDne, 6 termination TEC+, 3 ends are through choke coil L 3 and the collector electrode that meets triode Q4 after resistance R 20 is connected, and 3 ends are through choke coil L3 and the collector electrode that meets triode Q5 after resistance R 21 is connected simultaneously; Between 1,2 ends of U9 after shunt resistor R22 and the capacitor C 39 by 1 terminating resistor R25 to 6 ends, Pdne connecting resistance R30 again series resistors R27 connects 3 ends of U9, the ground connection of connecting after the resistance R 30 that meets simultaneously Pdne and potentiometer resistance R31, resistance R 32, the capacitor C 43 three's parallel connections, 5 ends meet VREF through resistance R 24, and 7 ends connect capacitor C 45 to ground through resistance R 28 and 8 ends altogether through resistance R 26; Pick out the base stage through diode D11, D12 to Q4 from the upper end of capacitor C 45, base stage connects capacitor C 44 to ground simultaneously, connects with resistance R 29 through diode D10 simultaneously and also arrives ground, and the base stage of Q4 connects the base stage of Q5, and the grounded-emitter connection of Q4, Q5;
The formation of described signals collecting and puocessing module is seen Fig. 6, and it comprises that signal conditioner, signal picker, processing unit, terminal show and external interface; The signal conditioner output that connects photodetector output is connected in series signal picker and processing unit successively, and processing unit output has terminal to show and external interface;
Wherein the signal conditioner circuit as shown in Figure 7, it mainly is comprised of operational amplifier U14, photoelectric diode U15; 1,5,8 ends of U15 are unsettled, 3,4 end ground connection, and 2 ends connect 6 ends after resistance R 39, capacitor C 60 the two parallel connection, and 6 ends connect 3 ends of U14,8 ends of 7 termination U14 through resistance R 43; The 4 end ground connection of U14,5 ends are unsettled, and 6,7 ends meet AD_VINI altogether, and 1 termination AD_OUT mouth, 2 ends be through resistance R 42 ground connection, the two parallel connection of connecting resistance R40 between 1,2 ends, capacitor C 59;
The present invention is based on pipeline leakage monitor and the method for leaking vibration quasi-distributed optical fiber sensing, with the optical fiber transducer that need not the to power pick device as leakage signal, utilize the signal remote transmission that realizes optical fibre vibration sensor with optical fiber and the Optical multiplexing technology of ditch laying with pipeline, solved the difficult problem of electric transducer power supply and telecommunication, laying optical fiber vibrating sensing unit comparatively thick and fast, many sensing units are united and are carried out time delay and estimate, improve the measuring vibration wave propagation velocity in case of natural gas pipeline leakage precision.
Description of drawings
Fig. 1 Fibre Optical Sensor system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage schematic diagram
The modulation principle figure of Fig. 2 optical frequency adjustable type light source
Fig. 3 modulation of source circuit diagram
Fig. 4 monitoring system of fiber optical sensing natural gas pipeline light path system
Fig. 5 light path adapter structure and transmission index path
Fig. 6 signals collecting and puocessing module structural drawing
Signal conditioning circuit figure in Fig. 7 signals collecting and the puocessing module
Embodiment
In conjunction with the accompanying drawings and embodiments the present invention is further specified, but should not limit protection scope of the present invention with this.
Embodiment. the formation of the natural gas line leakage system of the Fibre Optical Sensor that this example is used is seen Fig. 1, and it comprises light path system and circuit two-part; A Fibre Optical Sensor unit is installed on pipeline body at a certain distance, optical fiber transducer group of a plurality of Fibre Optical Sensor cell formations, each optical fiber transducer group connects behind the beam splitting apparatus that is serially connected in the optical fiber light source and the photodetector of receiving terminal with an optical fiber, photodetector output connects signals collecting and the puocessing module that comprises leakage signal identification and state event location function, and described signals collecting and puocessing module comprise that signal conditioner, signal picker, processing unit, terminal show and external interface; The signal conditioner output that connects photodetector output is connected in series signal picker and processing unit successively, and processing unit output has terminal to show and external interface.Signals collecting and puocessing module output connect microcomputer.Through the processing of signals collecting and puocessing module, the sensor group signal that mixes based on the frequency division multiplexing mode has been realized the demultiplexing of each sensor in the sensor group, obtains original leakage vibration wave signal.
This example is installed an optical fiber transducer such as 5km at a certain distance on pipeline body, 3 optical fiber transducers consist of an optical fiber transducer group, each optical fiber transducer group is received light source and the photodetector of receiving terminal with an optical fiber, photodetector output connects signals collecting and the puocessing module that comprises leakage signal recognition device and state event location device, and signals collecting and puocessing module output connect microcomputer.
This routine light path system (seeing Fig. 4) is based on the frequency division multiplexing principle and designs, and each optical fiber transducer connects a light path ABAP Adapter by two optical fiber, and all light path ABAP Adapter are connected in series successively, by the nearest light path ABAP Adapter welding system main frame of distance receiving terminal; Concrete optical routing light path ABAP Adapter, transmission cable and Fibre Optical Sensor unit three parts consist of; The light path ABAP Adapter is comprised of beam splitter and combiner device; The Fibre Optical Sensor unit adopts Mach-Zehnder interferometer or Michelson interferometer.
Specifically linking as shown in Figure 5 between each optical member in the described light path system, the beam splitting apparatus I 1 that the leak detection light that light source sends enters in the light path ABAP Adapter through transmission fiber I 5, it is 24: 1 that this beam splitting apparatus I 1 adopts splitting ratio, wherein ratio is that 24 output light continues to propagate along time delay optical fiber 4, until light path ABAP Adapter 2, and export ratio to be 1 output light enter first sensing unit 2 through connecting optical fiber, sensing unit 2 adopts the Mach-Zehnder interferometer structure, poor at 20m in order to guarantee that sensing unit has certain sensitivity control interferometer arm, this interferometer is wound on the elastomer of rubber material, elastomer is close to tube wall, adopts protective housing to fix; Between each sensing unit apart from Accurate Measurement, according to the output of light propagation time control light source; Beam splitting apparatus 1 in the light path ABAP Adapter 2 adopts 23: 1 splitting ratio, wherein ratio is that 23 output light continues to propagate until run into next light path ABAP Adapter along input optical fibre, and export ratio to be 1 output light enter second sensing unit 2 through connecting optical fiber, it is poor at 20m that this sensing unit adopts equally the Mach-Zehnder interferometer structure and controls interferometer arm, be wound on the elastomer of rubber material, elastomer is close to tube wall and is fixed; When the pipeline between first and second sensing unit 2 occurs to leak, leaking the vibration wave that causes is picked up by two sensing units respectively through the regular hour along pipe transmmision, import system's photoelectric conversion module into by transmission fiber 5, final system receives the time difference of leakage signal and the location that can realize leakage point in conjunction with vibration wave in ducted velocity of propagation according to sensing unit;
Described light source is a kind of special light source system that is fit to multiplexing and modulation /demodulation that comprises, laser and the dedicated modulation signal generating module adjustable by optical frequency consist of (seeing Fig. 2); Laser output connects the D/A follower in the modulation signal generation module, and the D/A follower connects signal generator, and signal generator has frequency adjustment, amplitude adjusted and the sawtooth wave/selection of falling sawtooth wave input; Can select such as sawtooth wave or the signal type of falling the saw wave modulator by programming, adjust signalization amplitude and frequency; Modulation signal acts on laser, and the output optical frequency is input in the sensing light path with the laser that the modulation signal synchronous waveform changes, and realizes multiplexing, the signal carrier that forms a plurality of sensing units of sensing unit;
Wherein the modulation of source circuit as shown in Figure 3, it is mainly by operational amplifier U7, Distributed Feedback Laser U8, operational amplifier U9 and 2 triode Q4, Q5 groups; The 7 termination VDC of U7, connect again with the circuit of capacitor C 38 parallel connections after connecting with diode D8, capacitor C 41 behind the 6 terminating resistor R18, meet VDC behind the 6 terminating resistor R19, connect again simultaneously the ground that is connected in series to of diode D4, D5, D6, D7,4,7,8,9,10 end ground connection, 3 ends are ground connection after resistance R 17,2 ends and the end that meets U8; 1, the 14 end ground connection of U8,12 ends are through capacitor C 34 ground connection, 5,11 termination VDC, 4 termination PDne, 6 termination TEC+, 3 ends are through choke coil L3 and the collector electrode that meets triode Q4 after resistance R 20 is connected, and 3 ends are through choke coil L3 and the collector electrode that meets triode Q5 after resistance R 21 is connected simultaneously; Between 1,2 ends of U9 after shunt resistor R22 and the capacitor C 39 by 1 terminating resistor R25 to 6 ends, Pdne connecting resistance R30 again series resistors R27 connects 3 ends of U9, the ground connection of connecting after the resistance R 30 that meets simultaneously Pdne and potentiometer resistance R31, resistance R 32, the capacitor C 43 three's parallel connections, 5 ends meet VREF through resistance R 24, and 7 ends connect capacitor C 45 to ground through resistance R 28 and 8 ends altogether through resistance R 26; Pick out the base stage through diode D11, D12 to Q4 from the upper end of capacitor C 45, base stage connects capacitor C 44 to ground simultaneously, connects with resistance R 29 through diode D10 simultaneously and also arrives ground, and the base stage of Q4 connects the base stage of Q5, and the grounded-emitter connection of Q4, Q5;
Wherein:
Operational amplifier U7 selects AD623;
Laser U8 selects the internal modulation semiconductor light sources;
Operational amplifier U9 selects AD8572;
Triode Q4, Q5 select NPN9014;
The formation of described signals collecting and puocessing module is seen Fig. 6, and it comprises that signal conditioner, signal picker, processing unit, terminal show and external interface; The signal conditioner output that connects photodetector output is connected in series signal picker and processing unit successively, and processing unit output has terminal to show and external interface;
Wherein the signal conditioner circuit as shown in Figure 7, it mainly is comprised of operational amplifier U14, photoelectric diode U15; 1,5,8 ends of U15 are unsettled, 3,4 end ground connection, and 2 ends connect 6 ends after resistance R 39, capacitor C 60 the two parallel connection, and 6 ends connect 3 ends of U14,8 ends of 7 termination U14 through resistance R 43; The 4 end ground connection of U14,5 ends are unsettled, and 6,7 ends meet AD_VINI altogether, and 1 termination AD_OUT mouth, 2 ends be through resistance R 42 ground connection, the two parallel connection of connecting resistance R40 between 1,2 ends, capacitor C 59;
Wherein:
Operational amplifier U14 selects AD8572;
Photoelectric diode U15 selects OPA380AID;
Light source adopts the narrow cable and wide optical fiber laser of 100kHZ live width, laser output connects beam splitting apparatus 1, it is 24: 1 that beam splitting apparatus 1 adopts splitting ratio, wherein ratio is that 24 output resume is propagated until run into beam splitting apparatus 2 along the transmission light path, beam splitting apparatus 1 export ratio is that 1 output terminal enters sensing unit 1 through connecting optical fiber, sensing unit 1 adopts the Mach-Zehnder interferometer structure, poor at 20m in order to guarantee that sensing unit has certain sensitivity control interferometer arm, this interferometer is wound on the elastomer of rubber material, and elastomer is close to tube wall and is fixed.Beam splitting apparatus 2 adopts 23: 1 splitting ratio, wherein ratio is that 23 output resume is propagated until run into next beam splitting apparatus 3 along the transmission light path, beam splitting apparatus 2 export ratios are that 1 output terminal enters sensing unit 2 through connecting optical fiber, sensing unit 2 same employing Mach-Zehnder interferometer structures and control interferometer arm are poor at 20m, be wound on the elastomer of rubber material, elastomer is close to tube wall and is fixed.When the pipeline between sensing unit 1 and the sensing unit 2 occurs to leak, leak the vibration wave that causes and picked up by sensing unit 1 and 2 respectively through the regular hour along pipe transmmision, receive the time difference of leakage signal and the location that can realize leakage point in conjunction with vibration wave in ducted velocity of propagation according to sensing unit 1 and 2.
A plurality of sensing points are being set along duct orientation, between each sensing unit apart from Accurate Measurement, according to the output of light propagation time control light source.
When the pipeline between sensing unit n and the sensing unit n+1 occurs to leak, leaking the vibration wave that causes is picked up by sensing unit n-1, n, n+1 and n+2 respectively through the regular hour along pipe transmmision, receive time difference of leakage signal according to adjacent a plurality of sensing units, just can measure vibration wave in ducted velocity of propagation.
Use this system, select some known sensing unit points to cause vibration by knocking the form simulation pipe leakages such as pipeline, quantity according to the pipe section that uses in engineering construction and the examination data, the leakage signal that propagates into two adjacent sensing units is carried out that time delay is estimated and realized leaking the mensuration of vibration wave speed in conjunction with known duct length, accurately provide the distance of two adjacent sensing unit points of current test point distance, with this simulation test point position X substitution: X=L-[v * (t
N+2-t
n)]/2, counter solving: v=2 (L-X)/(t
N+2-t
n), realize measuring vibration wave along the speed v of pipe transmmision according to the signal propagation time of known sensing unit span and mensuration.L is two distances between the adjacent sensing unit point in the formula; X is the distance apart from first sensing unit point (apart from starting point), and v leaks the vibration velocity of wave propagation.
This example is through test of many times, not only can realize the monitoring along any disturbance behavior of pipe transmmision by install to leak vibration sensing interference type sensing unit at tube wall, through can realizing the mensuration to vibration wave propagation velocity in case of natural gas pipeline leakage to signal analysis and processing and intelligent recognition, and system sensitivity is high, degree of accuracy is high, false alarm rate is low, be not subject to such environmental effects.
Claims (7)
1. a system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage is characterized in that it comprises light path system and circuit two-part; A Fibre Optical Sensor unit is installed on pipeline body at a certain distance, optical fiber transducer group of a plurality of Fibre Optical Sensor cell formations, each optical fiber transducer group connects behind the beam splitting apparatus that is serially connected in the optical fiber light source and the photodetector of receiving terminal with an optical fiber, photodetector output connects signals collecting and the puocessing module that comprises leakage signal identification and state event location function, and described signals collecting and puocessing module comprise that signal conditioner, signal picker, processing unit, terminal show and external interface; The signal conditioner output that connects photodetector output is connected in series signal picker and processing unit successively, and processing unit output has terminal to show and external interface; Signals collecting and puocessing module output connect microcomputer;
Send laser by light source, after the transmission light path realizes beam splitting, part light is transferred to the optical fiber transducer group that is installed on the tube wall, the optical fiber transducer group is picked up behind the leakage oscillating signal and noise of pipe transmmision, again be transmitted back to the photodetector of system through the transmission light path, carry out leakage signal demodulation and discriminance analysis by signals collecting and puocessing module, and leakage signal is carried out time delay estimate that realization is to the location of leakage point.
2. a kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage according to claim 1 is characterized in that described light path system is based on the frequency division multiplexing principle, is made of light path ABAP Adapter, transmission cable and Fibre Optical Sensor unit three parts; The light path ABAP Adapter is comprised of beam splitter and combiner device; The Fibre Optical Sensor unit adopts Mach-Zehnder interferometer or Michelson interferometer; Each optical fiber transducer connects a light path ABAP Adapter by two optical fiber, and all light path ABAP Adapter are connected in series successively, by the nearest light path ABAP Adapter welding system main frame of distance receiving terminal.
3. a kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage according to claim 1 and 2, arrive first light path ABAP Adapter after it is characterized in that described light path system specifically the input optical fibre in the exploring laser light input transmission cable that sends of laser entering the sensing unit group, be divided into two bundle laser by the beam splitter of this light path ABAP Adapter: a branch ofly enter first Fibre Optical Sensor unit through input optical fibre, light beam passes to next light path ABAP Adapter through time delay optical fiber in addition, be divided into two bundle laser by the beam splitter in the next light path ABAP Adapter again, a branch ofly enter second Fibre Optical Sensor unit, another Shu Zaijing transmission fiber is transferred to next light path ABAP Adapter, by that analogy, until laser arrives last Fibre Optical Sensor unit; Every 2-10 adjacent optical fiber transducer is divided into one group, and the interference signal of each optical fiber transducer transfers back to system receiving terminal by combiner device access passback optical fiber in the group; In last Fibre Optical Sensor unit of sensing unit group, laser no longer by the light path ABAP Adapter, directly enters the Fibre Optical Sensor unit; And through the optical signal behind each Fibre Optical Sensor unit, the combiner device by in the corresponding light path ABAP Adapter separately passes the optical signal of coming with the back and closes bundle, finally reaches the photoelectric conversion module of monitoring system through output optical fibre;
Described light path ABAP Adapter has been gathered beam splitter and combiner device; Input optical fibre and output optical fibre use is two different fibre cores in the same transmission cable; Transmission cable is together in series all light path ABAP Adapter; The length of the launching fiber on the pipeline between adjacent two sensing units and passback optical fiber all is greater than 1/2 of laser coherent length.
4. a kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage according to claim 3, it is characterized in that specifically being connected between each optical member in the described light path system: the leak detection light process transmission fiber (5) that light source sends enters the beam splitter (1) in the light path ABAP Adapter, it is 24: 1 that this beam splitter (1) adopts splitting ratio, wherein ratio is that 24 output light continues to propagate along time delay optical fiber (4), until light path ABAP Adapter (2), and export ratio to be 1 output light enter first sensing unit (2) through connecting optical fiber, sensing unit (2) adopts the Mach-Zehnder interferometer structure, the control interferometer arm is poor at 20m, this interferometer is wound on the elastomer of rubber material, elastomer is close to tube wall, adopts protective housing to fix; Between each sensing unit apart from Accurate Measurement, according to the output of light propagation time control light source; Beam splitter (1) in the light path ABAP Adapter (2) adopts 23: 1 splitting ratio, wherein ratio is that 23 output light continues to propagate until run into next light path ABAP Adapter along input optical fibre, and export ratio to be 1 output light enter second sensing unit (2) through connecting optical fiber, it is poor at 20m that this sensing unit adopts equally the Mach-Zehnder interferometer structure and controls interferometer arm, be wound on the elastomer of rubber material, elastomer is close to tube wall and is fixed.
5. a kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage according to claim 1, it is characterized in that described light source is a kind of special light source system that is fit to multiplexing and modulation /demodulation that comprises, laser and the dedicated modulation signal generating module adjustable by optical frequency consist of; The laser input connects the D/A follower in the modulation signal generation module, and the D/A follower connects signal generator, and signal generator has frequency adjustment, amplitude adjusted and the sawtooth wave/selection of falling sawtooth wave input; Select such as sawtooth wave or the signal type of falling the saw wave modulator by programming, adjust signalization amplitude and frequency; Modulation signal acts on laser, the laser that the output optical frequency changes with the modulation signal synchronous waveform; Laser optical power 1-17mW, the laser coherent length is poor greater than all the sensors interferometer brachium, but less than the delay fiber lengths sum on launching fiber between adjacent two interferometers and the passback optical fiber.
6. a kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage according to claim 5 is characterized in that described dedicated modulation signal generating module is mainly by operational amplifier U7, Distributed Feedback Laser U8, operational amplifier U9 and 2 triode Q4, Q5 groups; The 7 termination VDC of U7, connect again with the circuit of capacitor C 38 parallel connections after connecting with diode D8, capacitor C 41 behind the 6 terminating resistor R18, meet VDC behind the 6 terminating resistor R19, connect again simultaneously the ground that is connected in series to of diode D4, D5, D6, D7,4,7,8,9,10 end ground connection, 3 ends are ground connection after resistance R 17,2 ends and the end that meets U8; 1, the 14 end ground connection of U8,12 ends are through capacitor C 34 ground connection, 5,11 termination VDC, 4 termination PDne, 6 termination TEC+, 3 ends are through choke coil L3 and the collector electrode that meets triode Q4 after resistance R 20 is connected, and 3 ends are through choke coil L3 and the collector electrode that meets triode Q5 after resistance R 21 is connected simultaneously; Between 1,2 ends of U9 after shunt resistor R22 and the capacitor C 39 by 1 terminating resistor R25 to 6 ends, Pdne connecting resistance R30 again series resistors R27 connects 3 ends of U9, the ground connection of connecting after the resistance R 30 that meets simultaneously Pdne and potentiometer resistance R31, resistance R 32, the capacitor C 43 three's parallel connections, 5 ends meet VREF through resistance R 24, and 7 ends connect capacitor C 45 to ground through resistance R 28 and 8 ends altogether through resistance R 26; Pick out the base stage through diode D11, D12 to Q4 from the upper end of capacitor C 45, base stage connects capacitor C 44 to ground simultaneously, connects with resistance R 29 through diode D10 simultaneously and also arrives ground, and the base stage of Q4 connects the base stage of Q5, and the grounded-emitter connection of Q4, Q5.
7. a kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage according to claim 1 is characterized in that described signal conditioner main circuit will be comprised of operational amplifier U14, photoelectric diode U15; 1,5,8 ends of U15 are unsettled, 3,4 end ground connection, and 2 ends connect 6 ends after resistance R 39, capacitor C 60 the two parallel connection, and 6 ends connect 3 ends of U14,8 ends of 7 termination U14 through resistance R 43; The 4 end ground connection of U14,5 ends are unsettled, and 6,7 ends meet AD_VINI altogether, and 1 termination AD_OUT mouth, 2 ends be through resistance R 42 ground connection, the two parallel connection of connecting resistance R40 between 1,2 ends, capacitor C 59.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110272063.9A CN102997053B (en) | 2011-09-14 | 2011-09-14 | A kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110272063.9A CN102997053B (en) | 2011-09-14 | 2011-09-14 | A kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102997053A true CN102997053A (en) | 2013-03-27 |
| CN102997053B CN102997053B (en) | 2015-08-19 |
Family
ID=47925990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110272063.9A Active CN102997053B (en) | 2011-09-14 | 2011-09-14 | A kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102997053B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997059A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Method and system for measuring propagation speed of natural gas pipe leakage vibration wave |
| CN104456091A (en) * | 2014-11-13 | 2015-03-25 | 中国计量学院 | Fiber-optic interferometer CO2 pipe leak detection device based on 3*3 couplers |
| CN106678553A (en) * | 2017-03-17 | 2017-05-17 | 中国石油大学(华东) | Calculating method of propagation speed of leakage dynamic pressure waves in in-pipe gas |
| CN107270133A (en) * | 2017-05-25 | 2017-10-20 | 湖北省郢声机电科技有限责任公司 | A kind of pipeline fluid leakage positioner and its application method |
| CN108278496A (en) * | 2018-01-23 | 2018-07-13 | 常州大学 | Condenser type fuel gas pipeline leakage new detecting method |
| CN112014368A (en) * | 2020-08-24 | 2020-12-01 | 安徽思环科技有限公司 | Novel light path system for water quality three-dimensional fluorescence monitoring system |
| CN113804650A (en) * | 2021-09-18 | 2021-12-17 | 中国特种设备检测研究院 | Monitoring device and monitoring method |
| CN117307989A (en) * | 2023-11-30 | 2023-12-29 | 山东省科学院激光研究所 | Optical fiber pipeline leakage detection system and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060225507A1 (en) * | 2003-01-13 | 2006-10-12 | Paulson Peter O | Pipeline monitoring system |
| CN101266024A (en) * | 2008-05-09 | 2008-09-17 | 于晋龙 | Distributed optical fibre oil gas conveying pipeline early early-warning system based on polarization detection |
| CN201191221Y (en) * | 2008-05-09 | 2009-02-04 | 东南大学 | Disturbance signal determination module of distributed optical fiber vibration sensor system |
| CN201413557Y (en) * | 2009-05-31 | 2010-02-24 | 中国石油天然气管道局 | Optical path multiplexing system of regional anti-intrusion system based on fiber optic interferometers |
| CN202252871U (en) * | 2011-09-14 | 2012-05-30 | 中国石油天然气集团公司 | System for measuring vibration wave propagation velocity in case of natural gas pipeline leakage |
| CN102997059A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Method and system for measuring propagation speed of natural gas pipe leakage vibration wave |
-
2011
- 2011-09-14 CN CN201110272063.9A patent/CN102997053B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060225507A1 (en) * | 2003-01-13 | 2006-10-12 | Paulson Peter O | Pipeline monitoring system |
| CN101266024A (en) * | 2008-05-09 | 2008-09-17 | 于晋龙 | Distributed optical fibre oil gas conveying pipeline early early-warning system based on polarization detection |
| CN201191221Y (en) * | 2008-05-09 | 2009-02-04 | 东南大学 | Disturbance signal determination module of distributed optical fiber vibration sensor system |
| CN201413557Y (en) * | 2009-05-31 | 2010-02-24 | 中国石油天然气管道局 | Optical path multiplexing system of regional anti-intrusion system based on fiber optic interferometers |
| CN202252871U (en) * | 2011-09-14 | 2012-05-30 | 中国石油天然气集团公司 | System for measuring vibration wave propagation velocity in case of natural gas pipeline leakage |
| CN102997059A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Method and system for measuring propagation speed of natural gas pipe leakage vibration wave |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997059A (en) * | 2011-09-14 | 2013-03-27 | 中国石油天然气集团公司 | Method and system for measuring propagation speed of natural gas pipe leakage vibration wave |
| CN102997059B (en) * | 2011-09-14 | 2014-08-06 | 中国石油天然气集团公司 | Method and system for measuring propagation speed of natural gas pipe leakage vibration wave |
| CN104456091A (en) * | 2014-11-13 | 2015-03-25 | 中国计量学院 | Fiber-optic interferometer CO2 pipe leak detection device based on 3*3 couplers |
| CN104456091B (en) * | 2014-11-13 | 2017-02-15 | 中国计量学院 | Fiber-optic interferometer CO2 pipe leak detection device based on 3*3 couplers |
| CN106678553A (en) * | 2017-03-17 | 2017-05-17 | 中国石油大学(华东) | Calculating method of propagation speed of leakage dynamic pressure waves in in-pipe gas |
| CN106678553B (en) * | 2017-03-17 | 2019-02-22 | 中国石油大学(华东) | A kind of calculation method leaking dynamic pressure wave spread speed in gas in pipe |
| CN107270133A (en) * | 2017-05-25 | 2017-10-20 | 湖北省郢声机电科技有限责任公司 | A kind of pipeline fluid leakage positioner and its application method |
| CN108278496A (en) * | 2018-01-23 | 2018-07-13 | 常州大学 | Condenser type fuel gas pipeline leakage new detecting method |
| CN112014368A (en) * | 2020-08-24 | 2020-12-01 | 安徽思环科技有限公司 | Novel light path system for water quality three-dimensional fluorescence monitoring system |
| CN113804650A (en) * | 2021-09-18 | 2021-12-17 | 中国特种设备检测研究院 | Monitoring device and monitoring method |
| CN117307989A (en) * | 2023-11-30 | 2023-12-29 | 山东省科学院激光研究所 | Optical fiber pipeline leakage detection system and method |
| CN117307989B (en) * | 2023-11-30 | 2024-03-08 | 山东省科学院激光研究所 | Optical fiber pipeline leakage detection system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102997053B (en) | 2015-08-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102997059B (en) | Method and system for measuring propagation speed of natural gas pipe leakage vibration wave | |
| CN102997043B (en) | Method and system for multiplexing/de-multiplexing natural gas pipe leakage optical fiber monitoring sensor | |
| CN102997044B (en) | Method and system for resisting polarization fading of natural gas pipe leakage detecting sensor group | |
| CN102997045B (en) | Optical fiber sensing natural gas pipeline leakage event identification method and device | |
| CN102997061B (en) | Optical fiber sensor-based natural gas pipeline leakage monitoring system | |
| CN103047540B (en) | Based on the optical path system for monitoring leakage of natural gas of Fibre Optical Sensor | |
| CN102997062B (en) | Optical fiber sensor-based natural gas pipeline leakage monitoring method and system and installation method for system | |
| CN102997053B (en) | A kind of system for measuring vibration wave propagation velocity in case of natural gas pipeline leakage | |
| CN102997051A (en) | Optical fiber sensor-based natural gas pipeline leakage monitoring method and system | |
| CN102997057B (en) | Optical fiber sensor-based natural gas pipeline leakage monitoring method and system and installation method for system | |
| CN102997056B (en) | Method for measuring distance between natural gas pipe leakage detecting sensors | |
| CN102997060A (en) | Leakage point locating system of optical fiber sensing natural gas pipeline leakage monitoring system | |
| CN102997063A (en) | Natural gas pipeline leakage monitoring method based on optical fiber sensing | |
| CN202252871U (en) | System for measuring vibration wave propagation velocity in case of natural gas pipeline leakage | |
| CN102997055B (en) | Leakage point locating method and system of optical fiber sensing natural gas pipeline leakage monitoring system | |
| CN102997048B (en) | Method and system for resisting phase fading of natural gas pipe leakage optical fiber detecting system | |
| CN101813238B (en) | Sagnac/Mach-Zehnder interferometer profile fiber sensing system and time domain positioning method thereof | |
| CN106015947A (en) | Internet-based pipeline in-situ monitoring system | |
| CN103047541A (en) | Optical fiber sensing natural gas pipeline leakage accident recognition device | |
| CN211904459U (en) | City utility tunnel temperature measuring device | |
| CN202252866U (en) | Multiplexing/demultiplexing system of optical fiber monitoring sensor for natural gas pipeline leakage | |
| CN102997054A (en) | System for resisting polarization fading of natural gas pipe leakage detecting sensor group | |
| CN202252869U (en) | Natural gas pipeline leakage monitoring system based on fiber sensing | |
| CN102997050A (en) | System for resisting phase fading of natural gas pipe leakage optical fiber detecting system | |
| CN202338780U (en) | Optical fiber sensing natural gas pipeline leakage incident recognition device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170301 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: China National Petroleum Corporation Patentee after: China Petroleum Pipeline Bureau Engineering Co., Ltd. Address before: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee before: China National Petroleum Corporation Patentee before: China Petroleum and Natural Gas Pipeline Bureau |