WO2012029484A1 - Dispositif de détection de fuite pour conduite de transport de liquide et procédé à cet effet - Google Patents

Dispositif de détection de fuite pour conduite de transport de liquide et procédé à cet effet Download PDF

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Publication number
WO2012029484A1
WO2012029484A1 PCT/JP2011/067563 JP2011067563W WO2012029484A1 WO 2012029484 A1 WO2012029484 A1 WO 2012029484A1 JP 2011067563 W JP2011067563 W JP 2011067563W WO 2012029484 A1 WO2012029484 A1 WO 2012029484A1
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Prior art keywords
reflected wave
leak detection
pulse signal
signal
sampling
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PCT/JP2011/067563
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English (en)
Japanese (ja)
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和幸 中野
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株式会社潤工社
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Publication of WO2012029484A1 publication Critical patent/WO2012029484A1/fr

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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
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/165—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means by means of cables or similar elongated devices, e.g. tapes
    • 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
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/16—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means
    • G01M3/18—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators

Definitions

  • the present invention relates to a leak detection device for a liquid transportation pipeline such as an oil pipeline. Specifically, a change in characteristic impedance of a detection cable line such as a coaxial cable is detected by detecting a reflected wave of a pulse signal incident on the detection cable, and a defective portion of the detection cable and a liquid transport pipeline are detected.
  • the present invention relates to a leak detection device that identifies a leak location of a short time.
  • a TDR method (Time Domain Reflectometry, time domain reflection method) is known as one of methods for measuring the characteristic impedance of a coaxial cable.
  • detectors to which the TDR method is applied there are a detector that detects an abnormal portion of a coaxial cable, a leak detector that uses the coaxial cable as a detection cable, and the like.
  • a leak detection device applying the method (see Patent Documents 1 to 3).
  • This leakage detection device includes a detection cable configured by a coaxial cable, a pulse signal generator that generates a pulse signal incident from one end of the detection cable, and a detector that detects a reflected wave of the pulse signal from the detection cable And have.
  • the detection cable is arranged below the liquid transport pipeline, etc., and the insulator that is arranged between the conductors in the detection cable is made of a material whose characteristic impedance changes when the liquid to be detected infiltrates or penetrates.
  • a terminator having an impedance equivalent to the characteristic impedance of the detection cable is connected to the other end of the detection cable so as to be matched with the characteristic impedance.
  • the pulse signal incident on the detection cable does not generate a reflected wave.
  • the liquid leaks from the liquid transport pipeline or the like the liquid leaking from the pipeline penetrates the detection cable, and the characteristic impedance of the penetrated portion changes.
  • a pulse signal is incident on the detection cable, a reflected wave is generated before and after the portion where the characteristic impedance has changed due to liquid infiltration.
  • the detector detects leakage by detecting this reflected wave.
  • the leak location is calculated from the measured value of the time from when the pulse signal is incident on the detection cable until the reflected wave is detected and the pulse signal propagation time of the detection cable. be able to.
  • a conventional leak detection apparatus using the TDR method employs a method of measuring the reflected wave at one point each time a pulse signal is incident, thereby grasping the characteristic impedance at each measurement point. This is because the attenuation of the reflected wave depends on the propagation distance between the measurement point and the detection point, and the amplification factor of the reflected wave is different for each measurement point.
  • the number of measurements increases as the length of the pipeline to be measured increases, and as the interval between the measurement points is narrowed to increase the resolution of the measurement value.
  • the processing time was increased in proportion to the number of times.
  • an object of the present invention is to provide a leak detection device capable of solving the above-described problems.
  • the present invention shortens the processing time by employing an amplification unit that amplifies the reflected wave at a specific sampling period based on data representing the correlation between the propagation distance of the reflected wave and the attenuation of the reflected wave.
  • An object is to provide a leak detection device.
  • a leak detection device of the present invention is a device that detects a liquid leak from a liquid transport pipeline by detecting a reflected wave of a leak detection pulse signal incident on a leak detection cable.
  • a leak detection cable that is laid along the pipeline and changes its characteristic impedance when liquid leaked from the pipeline permeates, and a leak detection pulse signal generator that generates a leak detection pulse signal incident on the leak detection cable
  • a storage unit for storing data representing the correlation between the propagation distance of the reflected wave and the attenuation of the reflected wave, and the reflected wave with respect to the leak detection pulse signal is amplified in synchronization with the sampling signal repeated at a predetermined sampling period.
  • a gain amplifier that changes the gain of the reflected wave based on the data, and a gain amplifier; In synchronization with the pulling signal, a reflected wave is amplified for one leak detection pulse signal sampled a plurality of times, and having an A / D converter for converting the reflected wave sampled digital signal.
  • the liquid transport pipeline A leak detection device that can detect the presence or absence of liquid leak in a short time can be realized.
  • FIG. 1 shows an example of a leak detection apparatus according to the present invention.
  • the leak detection device 1 includes a detection sensor 11 and a signal processing unit 2.
  • the detection sensor 11 is disposed below the liquid transport pipeline 100 that transports a liquid such as petroleum.
  • the signal processing unit 2 inputs a pulse signal to the detection sensor 11, processes a reflected wave generated when the leaked liquid penetrates the detection sensor 11, detects a leak in the liquid transport pipeline 100, and detects the leak location Identify.
  • FIG. 2 shows an example of the detection cable 11 employed in the leak detection apparatus 1 according to the present invention.
  • the detection cable 11 includes an inner conductor 11a and an outer conductor 11b.
  • the inner conductor 11a can be formed of bare annealed copper or the like, and the outer conductor 11b is braided by tin-plated annealed copper wire, or braided by mixing tin-plated annealed copper wire and porous PTFE (polytetrafluoroethylene). Can be formed.
  • one end of the internal conductor 11 a is connected to the signal processing unit 2, and the other end is preferably connected to the terminator 13.
  • the impedance of the terminator 13 can be equivalent to the characteristic impedance of the detection cable 11. Accordingly, it is possible to prevent a reflected wave from being generated when a pulse signal is incident from one end of the detection cable.
  • the outer conductor 11b is grounded to the ground.
  • an inner protective layer 11c and a detection layer 11d are disposed between the inner conductor 11a and the outer conductor 11b of the detection cable 11.
  • An outer protective layer 11e and a protective braid 11f are disposed on the outer periphery of the outer conductor 11b.
  • the outer protective layer 11e and the detection layer 11d disposed on the outer periphery of the outer conductor 11b are formed of porous PTFE tape. As known to those skilled in the art, porous PTFE has good water repellency, while having the property of easily penetrating oils.
  • the external protective layer 11e, the external conductor 11b, and the detection layer 11d including a porous PTFE tape as a material can transmit oil without allowing moisture such as rainwater to permeate.
  • PTFE has the characteristic that the dielectric constant changes by containing oils.
  • the characteristic impedance of the detection cable 11 changes in the detection layer 11d formed between the inner conductor 11a and the outer conductor 11b when oil penetrates.
  • the porous PTFE tape employed for the material such as the detection layer 11d can be various porous PTFE tapes having different air contents in the porous material. By changing the air content in the porous material, a porous PTFE tape having a desired dielectric constant can be formed.
  • the inner protective layer 11c is formed of a resin such as PFA (perfluoroalkoxyalkane) and can prevent oils from penetrating into the inner conductor 11a.
  • the detection cable 11 and the signal processing unit 2 can be directly connected, but preferably, a dummy cable 15 can be inserted between the detection cable 11 and the signal processing unit 2. This is because when the dummy cable 15 is not inserted, there is a possibility that the incident pulse signal and the reflected wave are superimposed and the reflected wave cannot be detected.
  • the length of the dummy cable is determined by the pulse width of the input leakage detection pulse. For example, the length of the dummy cable can be set to 100 [m].
  • a safety barrier 110 can be disposed between the liquid transport pipeline 100 and the detection cable 11.
  • the safety barrier 110 has a function of preventing a combustible liquid such as petroleum leaking from the liquid transport pipeline 100 from igniting due to heat generated by the detection cable 11 or the like.
  • the signal processing unit 2 includes a central processing unit (CPU) 21, a storage unit 23, a pulse generation unit 31, a pulse width control unit 33, an I / O unit 41, and a digital-analog conversion unit (DAC) 51.
  • the CPU 21 is connected to the storage unit 23, the pulse generation unit 31, the pulse width control unit 33, and the like, and controls each element.
  • the pulse generation unit 31 generates a pulse signal based on the control of the CPU 21, provides the pulse signal to the pulse width control unit 33 that generates a signal incident on the detection cable 11, and controls the gain amplifier 53 that amplifies the reflected wave. This is provided as a sampling signal to the CPU 21 and the ADC 61 that converts the reflected wave into digital data.
  • the pulse width control unit 33 changes the cycle of the pulse signal generated by the pulse generation unit 31 and the pulse width by a frequency divider circuit or the like, and generates a leak detection pulse signal suitable for input to the detection cable 11. .
  • the leakage detection pulse signal may have a pulse width of about 200 [ns] to 250 [ns].
  • the leak detection pulse signal generated by the pulse width control unit 33 is transmitted to the detection cable 11 via the I / O unit 41.
  • the leakage detection pulse signal incident on the detection cable 11 is absorbed by the terminator 13 when there is no leakage in the liquid transport pipeline 100 and the characteristic impedance of the detection cable 11 does not match in the line direction. No reflected wave is generated.
  • the gain amplifier 53 detects the leakage point based on the gain table stored in the storage unit 23 that is read out via the DAC 51 for each sampling period of the sampling signal generated by the pulse generation unit 31.
  • the reflected wave is amplified to an appropriate size according to the above.
  • the reflected wave amplified by the gain amplifier 53 is sampled by the ADC 61 at the sampling period of the sampling signal generated by the pulse generator 31 and converted into a digital signal.
  • the signal digitized by the ADC 61 is stored in the storage unit 23 and also provided to the display device 113 and the storage device arranged outside the data processing unit 2 via the data I / O unit 71.
  • the leakage detection pulse signal and the time tc [s / m] for which the reflected wave moves by 1 m in the detection cable 11 are calculated.
  • the propagation speed Vc of the electromagnetic signal in the material is Indicated by
  • c is the speed of light in vacuum of 2.99 ⁇ 10 8 [m / s]
  • ⁇ is relative permeability
  • ⁇ is relative permittivity.
  • the leak detection pulse signal and the time tc during which the reflected wave moves 1 m through the detection cable 11 can be expressed by the reciprocal of the signal propagation velocity Vc, tc is Indicated by
  • the relative permeability ⁇ is 1, and assuming that the relative dielectric constant ⁇ of the porous PTFE used for the detection layer of the detection cable 11 is 1.5
  • the leakage detection pulse signal is passed through the detection cable 11.
  • the time tc when the reflected wave travels 1 m is It becomes.
  • the time ⁇ t [ns] from when the leakage detection pulse signal is incident from the incident end of the detection cable 11 until the reflected wave reflected at a point away from L [m] returns.
  • the pulse frequency generated by the pulse generator 31 is 31.25 [MHz] and the detection cable 11 has porous PTFE having a relative dielectric constant ⁇ of 1.5. That is, it is assumed that the sampling frequency generated by the pulse generator 31 corresponds to sampling the detection cable 11 every 4 [m].
  • the detection cable 11 having other pulse frequency and relative dielectric constant ⁇ is used.
  • the gain amplifier 53 Based on the gain table stored in the storage unit 23, the gain amplifier 53 amplifies the reflected wave with an appropriate amplification factor according to the distance from the incident end.
  • the gain table stored in the storage unit 23 stores data indicating the correlation between the distance between the end where the leak detection pulse signal is incident and the measurement point, that is, the propagation distance of the reflected wave and the attenuation of the reflected wave. Is done.
  • the CPU 21 reads the data stored in the gain table at the cycle of the sampling signal generated by the pulse generator 31 and provides it to the DAC 51 as a control signal for the gain amplifier 53.
  • This control signal corresponds to a control signal for controlling the gain of the gain amplifier 53.
  • the gain amplifier 53 amplifies the reflected wave with an appropriate gain according to the propagation distance of the reflected wave. It is.
  • data corresponding to a control signal for controlling the gain of the gain amplifier 53 can be stored, and an actual measurement value such as the attenuation rate of the reflected wave for each propagation distance of the reflected wave can also be stored.
  • the storage unit 23 stores data indicating the correlation between the stored actual measurement value and the gain of the gain amplifier 53, and the CPU 21 calculates an appropriate gain based on these data. .
  • the interval between the measurement points of the reflected wave attenuation rate stored in the gain table can be a distance interval synchronized with the sampling period.
  • the sampling period of the pulse signal of the pulse generation unit 31 corresponds to every 4 [m]
  • the gain table interval can be set every 4 [m]. Note that the correspondence between the propagation distance of the physical reflected wave and the distance corresponding to the amplification value stored in the gain table depends on the length of the dummy cable and the location of the leak detection device when installing the leak detection device. And the installation conditions such as the distance to the detection target pipeline.
  • the gain amplifier 53 can have two modes: a disconnection of the detection cable 11 or a disconnection / short-circuit detection disconnection / short-circuit detection test mode for detecting a short circuit, and a leak detection mode for detecting a liquid leak in the liquid transport pipeline. . Since the reflected wave generated at the time of disconnection or short circuit has an amplitude several times larger than the reflected wave generated at the time of leakage, there is a possibility of damaging the amplification element inside the gain amplifier 53 and an electronic circuit element such as the ADC 61. It is.
  • the disconnection / short circuit detection test mode can be executed before the leakage detection mode is executed.
  • FIG. 3 shows an example of the gain amplifier 53 having two modes of a short circuit detection test mode and a leak detection mode.
  • the reflected wave input from the I / O unit includes a signal provided directly to the multiplexer 56 via the buffer 54, and a signal provided to the multiplexer 56 via the amplification element 55. Distributed to.
  • the multiplexer 56 provides the former to the amplification element 57 in the disconnection / short-circuit detection test mode, and provides the latter to the amplification element 57 in the leakage detection mode.
  • the amplifying element 57 amplifies the reflected wave based on a control signal generated from the gain table stored in the storage unit 23 via the DAC 51.
  • the reflected wave amplified by the amplifying element 57 is provided to the ADC 61 via the buffer 58.
  • the reflected wave is sampled in the ADC 61 at the sampling signal cycle generated by the pulse generator 31 and converted into a digital signal. Since both the digital conversion in the ADC 61 and the amplification in the gain amplifier 53 are executed in the sampling cycle of the sampling signal generated by the pulse generation unit 31, both processes are executed in synchronization. Further, the ADC 61 can have a function capable of preventing an input of an unnecessary signal to the ADC 61 such as a signal having a large amplitude when an ADC input cutoff signal is input. By having such a function, the ADC 61 can avoid a signal having a large amplitude such as a reflected wave generated at the time of disconnection or short circuit.
  • FIG. 4 is a diagram illustrating an example of a timing chart in the present embodiment.
  • the sampling signal is a pulse signal generated by the pulse generator 31 shown in FIG.
  • the period of the sampling signal depends on the dielectric constant ⁇ of the detection layer of the detection cable 11 and the distance between measurement points. For example, when the relative dielectric constant ⁇ of the detection layer of the detection cable 11 is 1.5 and the distance between measurement points is 4 [m], the period of the sampling signal can be 32 [ns].
  • the distance of 0 [m] to 32 [m] added to the sampling signal is the propagation distance of the reflected wave.
  • the 0 [m] point is determined based on installation conditions such as the length of the dummy cable to be inserted, the installation location of the leak detection device, and the distance between the pipeline to be detected.
  • the leakage detection pulse signal is formed by, for example, dividing the sampling signal generated by the pulse generator 31 by the pulse width controller 33 shown in FIG. In the example shown in FIG. 4, the pulse width of the leak detection pulse signal has a length corresponding to eight cycles of the sampling signal.
  • the ADC input cut-off signal is a signal that cuts off the input of the ADC 61 so that an unexpected waveform such as a waveform having a large amplitude is not input to the ADC 61.
  • the leakage detection pulse signal is output from the pulse width control unit 33 and during an appropriate time after the leakage detection pulse signal is output so that the leakage detection pulse signal is not input to the ADC 61.
  • the reflected wave is a diagram schematically showing an analog signal observed at the input end of the ADC 61.
  • a waveform indicated by an arrow A is a part of a leak detection pulse signal input via a protection diode, and an amplitude is about 0.5 [V].
  • the waveform indicated by arrow B is a reflected wave of the leak detection pulse signal.
  • the characteristic impedance of the detection cable 11 changes due to liquid leakage from a liquid transport pipeline or the like, a reflected wave is generated.
  • an example in which liquid leakage occurs between 16 [m] and 24 [m] is shown.
  • the reflected wave digitally converted by the ADC 61 is stored as processing data in the storage unit 23 or the like.
  • the processing data stored in the storage unit 23 can be displayed as a waveform graph or the like on the display device 113 such as an LCD display device connected to the leak detection device 1 via the data I / O unit 71.
  • the inspector can determine the presence or absence of liquid leakage in the liquid transport pipeline by inspecting this display. Further, by comparing the reference data stored in the storage unit 23 or the storage device 115 with the processing data, it is possible to determine the presence or absence of liquid leakage in the liquid transport pipeline.
  • the reference data may be created based on the measured value measured when the leak detection apparatus 1 is installed, or may be created based on the average value of the latest plurality of processing data.
  • a predetermined threshold value may be further used when determining the presence or absence of liquid leakage. For example, the presence or absence of liquid leakage can be determined by comparing the maximum difference value between the processing data and the reference data with a predetermined threshold value.
  • an average value of a plurality of processing data may be used. This is to eliminate the influence of irregular noise such as thermal noise by using the average value of a plurality of processing data.
  • the leak detection apparatus 1 reads the gain table stored in the storage unit 23 at a predetermined sampling period, and gives the reflected wave an appropriate amplification factor according to the propagation distance of the reflected wave.
  • a plurality of reflected waves can be detected with respect to the leakage detection pulse signal. For example, when sampling reflected waves every 4 [m], it is possible to detect 250 reflected waves per 1000 [m] for one leak detection pulse signal. For this reason, in the leak detection apparatus 1 which concerns on this invention, compared with the conventional leak detection apparatus which detects one reflected wave with respect to one leak detection pulse signal, detection time can be shortened significantly.
  • a leak detection pulse signal incident on the detection cable 11 is generated using the signal generated by the single pulse generation unit 31, and the gain amplifier 53 and the ADC 61 are also generated. Therefore, it is easy to control the pulse signal and the reflected signal, and there is an advantage that the number of constituent elements can be reduced.
  • step 101 the CPU 21 generates a pulse signal having a predetermined period. Based on this pulse signal, a leak detection pulse signal incident on the detection cable 11 is generated, and the reflected wave from the detection cable 11 is amplified and A / D converted.
  • step 102 the CPU 21 causes the leakage detection pulse signal generated based on the pulse signal to enter the detection cable.
  • step 103 the CPU 21 amplifies the reflected wave at a predetermined sampling signal period, and in step 104, converts the amplified reflected wave from an analog signal to a digital signal.
  • step 105 the CPU 21 stores the data converted into the digital signal.
  • step 106 the CPU 21 determines whether or not steps 102 to 105 have been executed a predetermined number of times. If these steps have not been executed a predetermined number of times, the CPU 21 again enters the leak detection pulse signal into the detection cable in step 102. If these steps have been executed a predetermined number of times, in step 107, the CPU 21 compares the processing data that has undergone further processing such as averaging with the given reference data, and enters the liquid transport pipeline. It is determined whether or not liquid leakage has occurred.
  • FIG. 6 shows another example of the leak detection apparatus according to the present invention.
  • the leak detection device 3 includes a detection sensor 11 and a signal processing unit 4.
  • the signal processing unit 4 included in the leakage detection device 3 is different from the signal processing unit 2 included in the leakage detection device 1 in that it includes a delay amount selection unit 81. Therefore, here, the matters relating to the delay amount selection unit 81 which is the difference will be mainly described, and the explanation relating to the matters overlapping with the matters described above will be omitted.
  • the delay amount selection unit 81 receives the pulse signal generated by the pulse generation unit 31 and also receives the selection signal from the CPU 21 and is delayed by the delay amount selected by the selection signal. Is provided to the CPU 21 and the ADC 61 as a sampling signal. That is, the delay amount selection unit 81 can execute processing in the gain amplifier 53 and the ADC 61 at a timing delayed by the selected delay amount with respect to the pulse signal generated by the pulse generation unit 31. is there. As a result, leak detection can be performed with higher resolution than the leak detection device 1 that does not include the delay amount selection unit 81. That is, it is possible to shorten the measurement distance interval of the detection cable 11 and improve the resolution by sampling the time between the periods of the leakage detection pulse signal with the sampling signal delayed by the delay amount selection unit 81. is there.
  • the operation of the leakage detection device 3 having the delay amount selection unit 81 is performed by using the detection cable 11 having the porous PTFE having the relative dielectric constant ⁇ of 1.5 described above and the pulse signal generated by the pulse signal generation unit 31.
  • the frequency is 31.25 [MHz] will be described as an example.
  • the period of the pulse signal is 32 [ns], which corresponds to 4 [m] when converted to the sampling distance interval of the detection cable 11.
  • the delay amount selection unit 81 controls a pulse signal obtained by delaying the pulse signal generated by the pulse generation unit 31 through delay elements 83a, 83b, 83g, and the like by the selection signal.
  • the data is selected by the selector 85 and provided to the ADC 61 and the CPU 21.
  • the selector 85 shown in FIG. 7 outputs the pulse signal input to Din0 to Dout, the sampling points of the pulse signal are 0 [m], 4 [m] in order. ], 8 [m],. . . , 992 [m], 996 [m], 1000 [m],. . . Is assumed to correspond.
  • sampling points are 0.5 [m], 4.5 [m], 8.5 [m],. . . 992.5 [m], 996.5 [m], 1000.5 [m],. . .
  • 4 [ns] which is the delay difference between both pulse signals, corresponds to 0.5 [m] in the distance interval of the detection cable 11.
  • sampling points are 1 [m], 5 [m], and 9 [m]. ],. . . , 993 [m], 997 [m], 1001 [m],. . .
  • the resolution of the detection cable 11 can be increased without increasing the frequency of the pulse signal generated by the pulse generator 31. it can.
  • the sampling frequency is increased, it is necessary to use a signal processing circuit and a CPU having a high data rate.
  • the price of electronic components such as the ADC 51 and the DAC 61 increases exponentially as the rated sampling frequency increases.
  • the electronic circuit board In order to cope with high-frequency operation, the electronic circuit board must also use an expensive board with high noise resistance.
  • the leak detection device 3 having the delay amount selection unit 81 a plurality of signals obtained by delaying the pulse signal by different delay amounts are used as sampling signals without increasing the frequency of the pulse signal generated by the pulse generation unit 31. , Can increase the resolution. For example, even when a general-purpose pulse generation unit that generates a frequency such as 31.25 [MHz] is used, data with sufficiently high resolution and reliability can be acquired in a short time.
  • step 201 the CPU 21 provides a selection signal to the delay amount selection unit 81.
  • Steps 202 to 207 are the same as steps 101 to 106 in FIG.
  • step 208 after the leakage detection pulse is incident on the detection cable 11 for a predetermined number of times and the reflected signal is stored, the CPU 21 determines whether or not there is a delay amount not selected by the delay amount selection unit 81. To do. If there is an unselected delay amount, the process returns to step 201. If all the delay amounts are selected, in step 209, the CPU 21 combines the processing data delayed by different delay amounts into one data. By combining the processing data, processing data with improved resolution can be obtained. In step 210, the processed data is compared with the reference data.
  • the present invention can be used not only to identify a leak location in a transport pipeline, but also to identify a fault location in a leak detection cable.
  • a leakage detection apparatus that uses a coaxial cable having porous PTFE having a relative dielectric constant ⁇ of 1.5 as a detection cable has been described.
  • a detection cable having porous PTFE having a different dielectric constant or a detection cable using another resin as an insulating material can also be used as the detection cable.
  • the leak detection pulse signal is generated by the signal of the pulse generation unit 31 that generates the sampling signal, but can also be generated by another pulse generator.

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  • General Physics & Mathematics (AREA)
  • Examining Or Testing Airtightness (AREA)

Abstract

La présente invention concerne un dispositif de détection de fuite qui permet de réduire le temps de traitement. Ce dispositif de détection de fuite comprend un câble de détection de fuite (11) qui est posé le long d'une conduite et qui présente une impédance caractéristique qui varie en cas d'infiltration de liquide fuyant depuis la conduite; une unité de génération de signal impulsionnel de détection de fuite (33) qui génère un signal impulsionnel de détection de fuite incident sur le câble de détection de fuite; une unité de stockage (23) qui stocke des données indiquant la corrélation entre la distance de propagation d'une onde réfléchie et l'atténuation de l'onde réfléchie; un amplificateur (53) à gain variable et facteur d'amplification qui est un amplificateur à gain pour amplifier l'onde réfléchie du signal impulsionnel de détection de fuite de manière synchronisée avec un signal d'échantillonnage répété avec une période d'échantillonnage prédéterminée et qui change le facteur d'amplification de l'onde réfléchie en se basant sur les données; et une unité de conversion A/N (61) qui échantillonne l'onde réfléchie amplifiée du signal impulsionnel de détection de fuite de manière synchronisée avec le signal d'échantillonnage de multiples fois et convertit l'onde réfléchie échantillonnée en un signal numérique.
PCT/JP2011/067563 2010-08-31 2011-07-25 Dispositif de détection de fuite pour conduite de transport de liquide et procédé à cet effet WO2012029484A1 (fr)

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JP2010193643A JP5747206B2 (ja) 2010-08-31 2010-08-31 液体輸送パイプラインの漏洩検出装置、及びその方法
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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN110319978A (zh) * 2018-03-29 2019-10-11 深圳市水务(集团)有限公司 阀门密闭性检测方法、装置、终端设备及存储介质
WO2024123905A1 (fr) * 2022-12-06 2024-06-13 X Development Llc Surveillance de tuyau d'alimentation en temps réel

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JPS58196466A (ja) * 1982-05-13 1983-11-15 Omron Tateisi Electronics Co ケ−ブル等の特性測定方法
JPH0197830A (ja) * 1987-07-08 1989-04-17 Midwesco Inc 時間ドメインの反射測定及びサンプリング技術を用いた漏れ検出・位置決め装置
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JPH0197830A (ja) * 1987-07-08 1989-04-17 Midwesco Inc 時間ドメインの反射測定及びサンプリング技術を用いた漏れ検出・位置決め装置
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CN110319978A (zh) * 2018-03-29 2019-10-11 深圳市水务(集团)有限公司 阀门密闭性检测方法、装置、终端设备及存储介质
WO2024123905A1 (fr) * 2022-12-06 2024-06-13 X Development Llc Surveillance de tuyau d'alimentation en temps réel

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