WO2015194137A1 - 位置決定装置、漏洩検知システム、位置決定方法及びコンピュータ読み取り可能記録媒体 - Google Patents
位置決定装置、漏洩検知システム、位置決定方法及びコンピュータ読み取り可能記録媒体 Download PDFInfo
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- WO2015194137A1 WO2015194137A1 PCT/JP2015/002935 JP2015002935W WO2015194137A1 WO 2015194137 A1 WO2015194137 A1 WO 2015194137A1 JP 2015002935 W JP2015002935 W JP 2015002935W WO 2015194137 A1 WO2015194137 A1 WO 2015194137A1
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- position determination
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- pipe
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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
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
- G01M3/243—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations for pipes
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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
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/032—Analysing fluids by measuring attenuation of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
- G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4418—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a model, e.g. best-fit, regression analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/022—Liquids
Definitions
- the present invention relates to a position determination device, a leakage detection system, a position determination method, and a computer-readable recording medium.
- leakage position When the existence of a leak is clarified in a pipe through which a fluid such as water or gas flows, it is required to specify the position where the fluid leaked (hereinafter, referred to as “leakage position”) with high accuracy. .
- Patent Document 1 describes a pinhole position specifying method for a tubular body.
- a pressurized gas is filled in a tubular body, and a sound leaking from the gas is detected by a sound wave detection sensor installed at two points at intervals.
- the method of patent document 1 knows the position of the pinhole in a tubular body by contrasting the detection sound wave waveform of this sensor.
- the present invention has been made to solve the above-described problem, and includes a position determination device, a leakage detection system, a position determination method, and a computer-readable recording medium for determining a vibration measurement position for specifying a leakage position.
- One purpose is to provide.
- the position determination device is based on the feature amount extraction unit that extracts the feature amount for each of the detected vibrations based on the vibrations of the pipes detected by the plurality of detection units.
- Measuring position determining means for determining a measuring position by at least two detecting means.
- the feature amount is extracted for each of the detected vibrations based on the vibrations of the pipes respectively detected by the plurality of detection units, and at least two detection units are based on the feature amounts. Determine the measurement position.
- the computer-readable recording medium includes a process of extracting feature amounts for each of the detected vibrations based on the vibrations of the pipes detected by the plurality of detection units, and at least based on the feature amounts.
- a program for executing the process of determining the measurement position by the two detection means is stored non-temporarily.
- a position determination device it is possible to provide a position determination device, a leakage detection system, a position determination method, and a computer-readable recording medium that determine a vibration measurement position for specifying a leakage position.
- each component of each device represents a functional unit block.
- Each component of each device can be realized by any combination of an information processing device 1000 and software as shown in FIG. 15, for example.
- the information processing apparatus 1000 includes the following configuration as an example.
- each device can be realized as a dedicated device.
- Each device can be realized by a combination of a plurality of devices.
- FIG. 1 is a diagram showing a position determining apparatus according to the first embodiment of the present invention.
- FIG. 2 is a flowchart showing the operation of the position determination apparatus according to the first embodiment of the present invention.
- the position determination device 100 includes a feature amount extraction unit 110 and a measurement position determination unit 120.
- the feature amount extraction unit 110 extracts a feature amount based on the vibration of the pipe detected by the detection unit 101.
- the measurement position determination unit 120 determines measurement positions by at least two detection units based on the feature amount extracted by the feature amount extraction unit 110.
- the feature amount extraction unit 110 extracts feature amounts based on the vibration of the pipe detected by the detection unit 101.
- the detection unit 101 includes two detection units 101-1 and 101-2.
- the feature quantity extraction unit 110 extracts the feature quantity based on the vibration of the pipe detected by each of the detection unit 101-1 and the detection unit 101-2.
- the feature quantity extraction unit 110 can use, as the feature quantity, an index that can determine the similarity of the vibration waveforms detected by each of the detection units 101.
- the feature amount extraction unit 110 can extract, for example, the phase of the vibration of the pipe detected by each of the detection unit 101-1 and the detection unit 101-2 as a feature amount.
- the feature amount extraction unit 110 preferably extracts feature amounts based on vibrations caused by the same cause detected by each of the detection units 101. Moreover, it is preferable that the vibration for which the feature amount is extracted is vibration generated due to leakage from the fluid pipe (hereinafter sometimes referred to as “leakage vibration”).
- the measurement position determination unit 120 determines the measurement positions by the two detection units 101 based on the feature values extracted by the feature value extraction unit 110 based on the vibration of the pipe. As an example, the measurement position determination unit 120 detects a position where each feature amount of the detection unit 101 extracted by the feature amount extraction unit 110 satisfies a predetermined condition regarding similarity of vibration waveforms corresponding to the feature amount. It is set as a measurement position by each of the units 101. In this case, the measurement position determination unit 120 detects, for example, two positions that are determined to have high similarity in vibration waveform detected by each of the detection units 101 based on the above-described feature amount. Determine the measurement position by.
- the predetermined condition is appropriately determined such that vibrations having high waveform similarity satisfy the condition among vibrations at a plurality of points detected by the detection unit 101.
- the measurement position determination unit 120 includes at least two detection units based on the feature amount extracted based on the vibration of the pipe by the feature amount extraction unit 110 according to an arbitrary condition different from the above-described vibration waveform similarity. You may determine the measurement position by 101, respectively.
- the measurement position determination part 120 determines the measurement position by the detection part 101 as follows as a more detailed example, respectively. When it is assumed that leakage has occurred in any place of the piping, the above-described feature amounts are respectively converted by the feature amount extraction unit 110 based on the vibrations of the piping detected at a plurality of points on the piping.
- the vibration of the pipe at a plurality of points of the pipe is obtained by detecting vibration at each point, for example, by moving an arbitrary number of detection units 101 along the pipe.
- the measurement position determination unit 120 refers to the feature values at a plurality of points of the pipe extracted in this manner, and determines two feature values that are determined to have high similarity in the vibration waveform represented by the feature value. Is identified. Then, two points where the vibration corresponding to the feature amount is detected are determined as measurement positions by the detection unit 101. Note that the measurement position determination unit 120 may determine three or more points that satisfy the predetermined condition relating to the similarity of the vibration waveforms described above as measurement positions by the detection unit 101.
- the measurement position determination unit 120 sets a position where the difference between the feature amounts of the detection unit 101 extracted by the feature amount extraction unit 110 is equal to or less than a predetermined threshold as a measurement position by each of the detection units 101. For example, when the feature quantity extraction unit 110 extracts the vibration phase of the piping as the feature quantity, the measurement position determination unit 120 detects the position where the phase difference extracted from each detection unit 101 is equal to or less than the threshold value. It can be set as the measurement position by each. This is because the detection unit is installed at a position where the difference between the feature amounts of the detection unit 101 extracted by the feature amount extraction unit 110 is equal to or less than the threshold value, and thus the similarity of the vibration waveform detected by each of the detection units 101 This is because it increases.
- the measurement position determination unit 120 can set a predetermined point where the vibration of the pipe can be detected as a measurement position by each of the detection units 101. In addition, when the measurement position determination unit 120 determines the measurement position by each of the detection units 101, a predetermined range in which the vibration of the pipe can be detected can be set as the measurement position by each of the detection units 101. Furthermore, the measurement position determination unit 120 can appropriately determine the above-described threshold value based on, for example, the type, diameter, or material of the piping that each of the detection units 101 is a vibration detection target. When the measurement position by each of the detection units 101 is determined by the measurement position determination unit 120, the leakage position from the fluid pipe is specified using the detection unit 101 arranged at the measurement position. Details regarding the specification of the leakage position will be described later.
- the position determination device 100 acquires a measurement value related to the vibration of the pipe detected by each of the detection units 101 (step S101). Subsequently, the feature quantity extraction unit 110 extracts a feature quantity based on the measurement value related to vibration acquired in step S101 (step S102). Subsequently, the measurement position determination unit 120 determines a measurement position by each of the detection units 101 based on the feature amount acquired in step S102 (step S103). (Example of leak detection system having a position determination device in the present embodiment) Next, the configuration of the leak detection system 10 having the position determination device in the present embodiment will be described.
- FIG. 3 is a diagram showing a leak detection system according to the first embodiment of the present invention.
- FIG. 4 is a diagram illustrating an example in which a detection unit is installed in a pipe in the leak detection system according to the first embodiment of the present invention.
- FIG. 5 is a flowchart showing the operation of the leak detection system according to the first embodiment of the present invention.
- the leak detection system 10 includes a detection unit 101, the position determining device 100 described above, and a leak position specifying unit 102.
- the detection unit 101 detects vibration of the pipe.
- the leak position specifying unit 102 specifies the position where the fluid leaked in the pipe based on the vibration of the pipe detected by the two detection units 101 located at the position determined by the position determining device 100.
- the detection unit 101 is attached to a pipe as shown in FIG. 4, for example.
- the detection unit 101 detects vibration of the fluid flowing through the pipe or the inside of the pipe.
- a sensor that measures solid vibration can be used.
- Applicable sensors include a piezoelectric acceleration sensor, an electrodynamic acceleration sensor, a capacitance acceleration sensor, an optical speed sensor, a dynamic strain sensor, and the like.
- the detection unit 101 may be another type of sensor such as an acoustic sensor.
- the measurement value related to the vibration detected by the detection unit 101 is transmitted to the position determination device 100 included in the leak detection system 10 by any communication means.
- the detection part 101 is installed in the outer wall surface and inner wall surface of piping.
- the detection unit 101 may be installed on a flange (not shown) installed in the pipe 1 or on the surface or inner surface of an accessory such as a valve plug.
- the detection unit 101 is attached to a pipe or the like using, for example, a magnet, a dedicated jig, or an adhesive.
- piping may be embed
- piping may be installed in the structure.
- the leak position specifying unit 102 specifies the position where the fluid leaks in the pipe based on the vibration of the pipe detected by the two detection units 101.
- the detection unit 101 detects vibrations at the positions determined by the position determination device 100, for example.
- the leak position specifying unit 102 specifies the leak position by an arbitrary method such as a correlation method.
- the leak position specifying unit 102 calculates the leak position 11 from the following equation (1) from the vibration arrival time difference ⁇ , the vibration propagation speed c, and the distance l between the detection parts.
- the leakage position l1 represents a distance from one of the two detection units 101.
- the arrival time difference ⁇ is a difference in time when leakage vibration is detected by each of the two detection units 101.
- the arrival time difference ⁇ is the arrival time of the leakage signal in one of the two detection units 101 from the arrival time of the leakage signal in the other detection unit 101 different from the one described above. Calculated by subtracting.
- the arrival time difference ⁇ is calculated using, for example, a cross-correlation function of vibration detected by each of the two detection units 101.
- the propagation speed c is a speed at which leakage vibration propagates through the pipe.
- the propagation vibration c is determined by the type and material of the pipe, the soil around the pipe, and the like.
- the propagation velocity c can be obtained theoretically from information such as the type of piping described above, or can be obtained experimentally.
- the distance l between the detection units is a distance between the detection unit 101-1 and the detection unit 101-2.
- the position determination device 100 of the leak detection system 10 acquires a measurement value related to the vibration of the pipe detected by each of the detection units 101 (step S151). Subsequently, the feature quantity extraction unit 110 extracts a feature quantity based on the measurement value related to vibration acquired in step S151 (step S152). Subsequently, the measurement position determination unit 120 determines a measurement position by each of the detection units 101 based on the feature amount acquired in step S152 (step S153). The operation from step S151 to step S153 can be the same as the operation described as step S101 to step S103 in the position determining apparatus 100.
- the leakage position specifying unit 102 specifies the position where the fluid has leaked in the pipe based on the measurement value related to the vibration of the pipe detected by the detection unit 101 installed at the position determined in step S153. (Step S154).
- the leak position specifying unit 102 can specify the position where the fluid leaks in the pipe by, for example, the correlation method.
- the leak detection system 10 specifies a position where a fluid leak has occurred in the pipe by, for example, a correlation method.
- a correlation method when a position where a fluid leak has occurred in a pipe is specified, for example, an arrival time difference calculated from a cross-correlation function of vibration waveforms detected by each of the two detection units is used.
- the vibration waveforms detected by the two detection units are the same or similar.
- the vibration generated when the fluid leaks from the pipe has frequency dispersibility having different propagation characteristics for each frequency even in each form.
- the vibration generated when the fluid leaks from the pipe collapses in the process in which each vibration propagates through the pipe. Therefore, the further away from the leaked place (ie, the vibration source), the original waveform at the leaked place.
- the waveform may be different.
- the position of the leak point is at a point that is biased toward one of the two detection units.
- the similarity of the vibration waveform detected by each of the two detection units may be lost due to the vibration propagation characteristics in the pipe described above. For example, a plurality of vibrations in a propagation state arrive at the detection unit close to the leakage position.
- the vibration of the propagation state that is likely to be attenuated does not reach the detection unit far from the leaked part, and only the vibration of the propagation state that is difficult to attenuate may arrive.
- the determination accuracy of the arrival time difference may be lowered. And as a result of the determination accuracy of the arrival time difference being lowered, there is a case where the accuracy of specifying the position where the fluid leaks in the piping is lowered.
- the position of the leakage point is equidistant or nearly equidistant from the two detection units, there is often no large difference in the propagation state of vibrations reaching the two detection units. In this case, the similarity of the vibration waveform detected by each of the two detection units is not easily lost. Therefore, when the arrival time difference of the leakage vibration is calculated based on the cross-correlation function of the vibration waveform detected by each of the two detection units, it is compared with the case where the position of the leakage point is at a point biased to one detection unit. In many cases, the determination accuracy of the arrival time difference is high.
- the piping is compared with the case where the position of the leaking part is at a point biased to one of the detection units. In many cases, the accuracy of specifying the position where the fluid leaks is high.
- the similarity of the vibration waveform may not be easily lost depending on the vibration propagation characteristics in the pipe. For this reason, it is often the case that the accuracy of specifying the position where the fluid has leaked in the pipe is high by detecting the leakage vibration at two places where the similarity of the vibration waveform is relatively high.
- the fluid leak occurred in the pipe by specifying the leak position after determining the measurement position by the detector based on the feature value The position can be specified with high accuracy.
- the position determination device 100 determines the measurement position by the detection unit 101 in the piping based on the feature amount. Therefore, the similarity of leakage vibration detected by the detection unit 101 can be increased.
- the leak detection system 10 in this embodiment specifies a leak position based on the vibration detected by the detection unit 101. That is, by using the position determination device 100 in the present embodiment, it is possible to determine the measurement position by the detection unit for specifying the leakage position. And the leak position can be specified with high precision by using the leak detection system 10 in this embodiment.
- the position determination device 100 has, for example, a difference in arrival time of vibration to each detection unit 101, an envelope of a vibration waveform of the pipe, or an amplitude of vibration of the pipe as the feature amount in addition to the vibration phase of the pipe. Can be used.
- the measurement position determination unit 120 can set the position where the arrival time difference is equal to or less than the threshold as the measurement position. .
- the measurement position determination unit 120 detects a position where the difference in the shape of the envelope extracted from each detection unit 101 is equal to or less than a threshold value. It can be set as a measurement position by each part 101.
- the measurement position determination unit 120 detects a position where the difference in amplitude extracted from each detection unit 101 is equal to or less than a threshold value. 101 can be set as each measurement position.
- the position determination device 100 can determine the measurement position by the detection unit with high accuracy. However, in extracting feature values in the feature quantity extraction unit 110 and measurement positions in the measurement position determination unit 120, information on the entire waveform is required. That is, the amount of data required increases. On the other hand, the amount of data required in the feature amount extraction unit 110 or the measurement position determination unit 120 when using the envelope of the vibration waveform or the vibration amplitude as the feature amount is when using the vibration phase of the pipe as the feature amount. Smaller than the amount of data required.
- the feature amount used in the position determination device 100 depends on the accuracy required for specifying the leak position, the amount of data that can be transmitted from each of the detection units 101, the power consumption of the position determination device 100 or the detection unit 101, and the like. It is determined appropriately.
- the position determination device 100 determines the measurement position by the detection unit 101 that detects vibration of the pipe.
- the position determination device 100 according to the present embodiment can be used to determine the measurement position by the detection unit that detects the vibration of the structure, for example, in order to identify the deterioration position of the structure.
- FIG. 6 is a diagram showing a position determination device according to the second embodiment of the present invention.
- FIG. 7 is a diagram illustrating an example in which a detection unit that is a determination target of a measurement position is installed in a pipe in the position determination device according to the second embodiment of the present invention.
- FIG. 8 is a flowchart showing the operation of the position determination apparatus according to the second embodiment of the present invention.
- the position determination device 200 includes a feature amount extraction unit 110 and a measurement position determination unit 120.
- the feature amount extraction unit 110 extracts a feature amount based on the vibration of the pipe detected by each of the detection units 101-1 to 101-n.
- the measurement position determination unit 120 selects two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n based on the feature amount extracted by the feature amount extraction unit 110.
- the position determination apparatus 100 is configured so that the measurement position determination unit 120 can detect two detection units from the detection unit 101-1 to the detection unit 101-n based on the feature amount extracted by the feature amount extraction unit 110.
- the point which selects one detection part differs from the position determination apparatus 100 in 1st Embodiment.
- the position determination device 100 in the present embodiment selects two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n, which are attached to a pipe or the like in advance, for example. Each measurement position by the detection unit is determined.
- the position determination device 100 in the second embodiment has the same configuration as the position determination device 100 in the first embodiment.
- the leak detection system 20 which has the position determination apparatus 200 in this embodiment can be comprised similarly to the leak detection system 10 in 1st Embodiment.
- the leakage detection system 20 selects, for example, at least two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n, and based on the vibration detected by the selected detection unit. Identify the location where piping leaks occur.
- the measurement position determination unit 120 selects at least two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n based on the feature amount extracted by the feature amount extraction unit 110. For example, when the measurement position determination unit 120 selects two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n, the combination of the two detection units that minimizes the difference in the feature amount is selected. can do. In addition, the measurement position determination unit 120 can select a set of two detection units having a feature amount difference equal to or less than a threshold among the detection units from the detection unit 101-1 to the detection unit 101-n. The measurement position determination unit 120 may select at least two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n by other methods.
- the measurement position determination unit 120 minimizes the extracted phase difference among the detection units from the detection unit 101-1 to the detection unit 101-n, for example.
- a set of two detectors can be selected. By doing in this way, the measurement position determination part 120 determines the measurement position by the at least 2 detection part 101, respectively.
- the position determination device 200 first acquires a measurement value related to the vibration of the pipe detected by each of the detection units 101 (step S201). Subsequently, the feature quantity extraction unit 110 extracts a feature quantity based on the measurement value related to vibration acquired in step S101 (step S202). The operations of Step S201 and Step S202 can be performed in the same manner as Step S101 and Step S102 in the first embodiment of the present invention. Subsequently, the measurement position determination unit 120 selects two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n based on the feature amount acquired in step S202 (step S203).
- the measurement position determination unit 120 selects at least two detection units in step S203. A specific example of the operation to be performed will be described.
- FIG. 7 an example in which leakage occurs from the leakage position 180 of the pipe is assumed.
- the two detection units close to the leakage position 180 are the detection unit 101-3 and the detection unit 101-4.
- the distances from the leak position 180 to each of the detection unit 101-3 and the detection unit 101-4 are different.
- the distance from the leak position 180 to each of the detection unit 101-2 and the detection unit 101-5 is substantially the same. Therefore, in this assumption example, the vibration waveform of the pipe detected by each of the detection unit 101-2 and the detection unit 101-5 is detected by each of the detection unit 101-3 and the detection unit 101-4. It is expected that the similarity is high compared to the vibration waveform of the pipe.
- the measurement position determination unit 120 sets a combination of the detection unit 101-2 and the detection unit 101-5, which are expected to have high waveform similarity, in order to increase the accuracy of specifying the leakage position of the pipe. It is preferable to select two detection units.
- the measurement position determination unit 120 determines the difference in feature amount extracted based on the vibration of the pipe detected by each of the detection unit 101-3 and the detection unit 101-4 (hereinafter referred to as “first difference”). ”).
- the measurement position determining unit 120 for example, a difference in feature amount extracted based on the vibration of the pipe detected by each of the detection unit 101-2 and the detection unit 101-5 (hereinafter referred to as “second difference”). Ask).
- the measurement position determination unit 120 compares, for example, the first difference and the second difference. In this case, if the second difference is smaller, the measurement position determination unit 120 can select the combination of the detection unit 101-2 and the detection unit 101-5 as two detection units.
- the leakage position is specified by the leakage detection system 20 including the position determination device 200 in the present embodiment.
- the leak detection system 20 identifies the position where fluid leakage has occurred in the pipe based on the measurement values relating to the vibration of the pipe detected by the detection unit 101-2 and the detection unit 101-5 selected as described above.
- the vibration waveform of the pipe detected by each of the detection unit 101-2 and the detection unit 101-5 is similar to the waveform of the vibration of the pipe detected by each of the detection unit 101-3 and the detection unit 101-4.
- the leakage system 20 including the position determination device 200 in the present embodiment can increase the accuracy of specifying the leakage position 180.
- the measurement position determination unit 120 detects at least two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n based on the feature amount. select. Thereby, the measurement position determination part 120 determines the measurement position by at least two detection parts. That is, the measurement position determination unit 120 can determine two positions with relatively high vibration waveform similarity as measurement positions by the detection unit. Therefore, the position determination device 200 according to the present embodiment can increase the accuracy of specifying the leakage position of the pipe when, for example, a plurality of detection units are installed in the pipe in advance. (Third embodiment) Subsequently, a third embodiment of the present invention will be described.
- FIG. 9 is a diagram showing a position determining apparatus according to the third embodiment of the present invention.
- FIG. 10 is a flowchart showing the operation of the position determination apparatus according to the third embodiment of the present invention.
- the position determination device 300 includes a signal-to-noise ratio calculation unit 130, a feature amount extraction unit 110, and a measurement position determination unit 120.
- the signal-to-noise ratio measuring unit 130 calculates each signal-to-noise ratio for the measurement value related to the vibration of the pipe detected by the detecting unit 101.
- the feature amount extraction unit 110 extracts a feature amount based on the vibration of the pipe detected by the detection unit 101.
- the measurement position determination unit 120 includes two detection units based on the feature amount extracted by the feature amount extraction unit 110 and the signal-to-noise ratio of the measurement value obtained by each detection unit calculated by the signal-to-noise ratio measurement unit 130. Determine the measurement position.
- the position determination device 300 according to the present embodiment is different from the position determination device 100 according to the first embodiment of the present invention in that the signal-to-noise ratio calculation unit 130 is included. Moreover, the position determination apparatus 300 in this embodiment is that the measurement position determination part 120 determines the measurement position by two detection parts based on the signal-to-noise ratio of a measurement value. It differs from the position determination apparatus 100 in the form. Regarding other elements, the position determination device 300 in the present embodiment has the same configuration as the position determination device 100 in the first embodiment.
- the leak detection system which has the position determination apparatus 300 in this embodiment can be comprised similarly to the leak detection system 10 in 1st Embodiment.
- the signal-to-noise ratio measurement unit 130 calculates each signal-to-noise ratio with respect to the measurement value related to the vibration of the pipe detected by each of the detection units 101.
- the signal-to-noise ratio can be the ratio of the amplitude of the leakage vibration and the vibration of the pipe when there is no leakage from the pipe.
- the signal-to-noise ratio can be the ratio of information related to pipe vibration to other noise.
- the measurement position determination unit 120 includes two detection units based on the feature amount extracted by the feature amount extraction unit 110 and the signal-to-noise ratio of the measured value in each detection unit calculated by the signal-to-noise ratio measurement unit 130. Determine the measurement position. For example, the measurement position determination unit 120 determines a position where the difference between the feature amounts of the detection unit 101 is equal to or less than a predetermined threshold and the signal-to-noise ratio exceeds a predetermined threshold as a measurement position by each of the detection units 101. can do.
- the threshold value relating to the signal-to-noise ratio includes, for example, characteristics relating to each of the detection units 101, types of pipes (for example, pipe materials and diameters) to be detected by the detection units 101, vibrations in the pipes, and the like. It may be a value theoretically calculated based on information on propagation characteristics, soil around the pipe, and the like. In addition, this threshold value is a measured value of leakage vibration that has occurred in the past in each piping of the detection unit 101 as a vibration detection target or the same type of pipe as the vibration detection target, or a simulation generated in advance for these pipes. It may be a value obtained experimentally based on a measured value of typical leakage vibration.
- the position determination device 300 acquires a measurement value related to the vibration of the pipe detected by each of the detection units 101 (step S301). This step can be performed in the same manner as step S101 in the first embodiment of the present invention.
- the signal-to-noise ratio measurement unit 130 calculates each signal-to-noise ratio with respect to the measurement value related to the vibration of the pipe detected by each of the detection units 101 (step S302).
- the measurement value related to the vibration of the pipe includes an arbitrary value representing the vibration state of the pipe detected by each of the detection units 101, such as the amplitude of vibration.
- the signal to noise ratio measurement unit 130 calculates the signal to noise ratio as follows, for example. That is, the signal-to-noise ratio measuring unit 130 first sets the measurement values related to the vibration of the pipe including the vibration caused by the leakage of the fluid from the pipe detected by each of the detectors 101 to the characteristic part of the leak.
- the amplitude of each vibration is calculated as the signal amplitude.
- the characteristic part of the leakage is, for example, a frequency band that is assumed to generate a vibration with a large amplitude due to the leakage. This frequency band is determined according to the type of piping that each of the detection units 101 is a detection target.
- the amplitude of the vibration is, for example, a filter process for extracting a frequency band designated in advance according to the type of the pipe, etc., for the measurement value related to the vibration of the pipe detected by each of the detection units 101, It is calculated by obtaining the amplitude of vibration after performing the filtering process.
- the signal-to-noise ratio measurement unit 130 calculates the amplitude of each vibration as the noise amplitude for the measurement value related to the vibration of the pipe when there is no fluid leakage from the pipe.
- the signal-to-noise ratio measurement unit 130 calculates the signal-to-noise ratio in the measurement value related to the vibration of the pipe detected by each of the detection units 101 by obtaining the ratio between the signal amplitude and the noise amplitude. .
- the feature amount extraction unit 110 extracts a feature amount based on the measurement value related to vibration acquired in step S301 (step S303). This step can be performed similarly to step S102 in the first embodiment of the present invention.
- the measurement position determination unit 120 determines the measurement positions by the two detection units based on the feature amount extracted in step S303 and the signal-to-noise ratio of the measurement value calculated in each detection unit in step S302 ( Step S304).
- the measurement position determination unit 120 detects a position where the signal-to-noise ratio calculated for each of the detection units 101 exceeds a predetermined threshold among the positions where the difference between the feature amounts of the detection units 101 is equal to or less than the threshold. It can be set as the measurement position by each.
- the signal-to-noise ratio measurement unit 130 calculates each signal-to-noise ratio for the measurement value related to the vibration of the pipe detected by each of the detection units 101. .
- the measurement position determination unit 120 determines the measurement positions by the two detection units based on the feature amount extracted in step S303 and the signal-to-noise ratio of the measurement value in each detection unit calculated in step S302.
- the position determination apparatus 200 can determine the measurement position by the detection part with a high signal-to-noise ratio, ie, a leak signal becomes clear. Therefore, the position determination device 300 in the present embodiment can increase the accuracy of specifying the leakage position of the pipe.
- the position determination apparatus 300 in this embodiment can operate
- the position determination device 300 can operate in the reverse order of the operation in step S302 and the operation in step S303.
- the position determining device 300 can operate in parallel with the operation in step S302 and the operation in step S303.
- the position determination device 300 in the present embodiment can be combined with the position determination device 200 in the second embodiment of the present invention.
- the signal-to-noise ratio measuring unit 130 can calculate the respective signal-to-noise ratios for the measurement values related to the vibrations of the pipes detected by the detecting units 101-1 to 101-n. it can.
- the measurement position determination unit 120 has a feature amount difference smaller than a predetermined threshold among the detection units from the detection unit 101-1 to the detection unit 101-n, and a signal-to-noise ratio is a predetermined value. A set of two detection units exceeding the threshold value can be selected. (Fourth embodiment) Subsequently, a fourth embodiment of the present invention will be described.
- FIG. 11 is a diagram showing a position determining apparatus according to the fourth embodiment of the present invention.
- FIG. 12 is a flowchart showing the operation of the position determination apparatus according to the fourth embodiment of the present invention.
- the position determination device 400 includes a leakage presence / absence determination unit 140, a feature amount extraction unit 110, and a measurement position determination unit 120.
- the leakage presence / absence determination unit 140 determines whether or not fluid leakage has occurred in the pipe based on the vibration of the pipe detected by the detection unit 101.
- the position determination device 100 according to the fourth embodiment has the same configuration as the position determination device 100 according to the first embodiment.
- the leak detection system which has the position determination apparatus 400 in this embodiment can be comprised similarly to the leak detection system 10 in 1st Embodiment.
- the leakage presence / absence determination unit 140 determines whether or not fluid leakage has occurred in the pipe based on the vibration of the pipe detected by the detection unit 101.
- the leakage presence / absence determination unit 140 can determine that fluid leakage has occurred in the pipe when the amplitude of vibration of the pipe detected by any of the detection units 101 exceeds a predetermined threshold.
- the position determination device 400 acquires a measurement value related to the vibration of the pipe detected by each of the detection units 101 (step S401).
- the operation in step S401 can be the same as that in step S101 in the first embodiment of the present invention.
- the leakage presence / absence determination unit 140 determines whether or not fluid leakage has occurred in the pipe based on the vibration of the pipe detected by the detection unit 101 (step S402). If it is determined that fluid leakage has occurred in the pipe (step S403), the feature amount extraction unit 110 extracts the feature amount based on the measurement value related to vibration acquired in step S401 (step S404). . Subsequently, the measurement position determination unit 120 determines a measurement position by each of the detection units 101 based on the feature amount acquired in step S404 (step S405). The operations in steps S404 and S405 can be the same as those in steps S102 and S103 in the first embodiment of the present invention. If it is determined in step S403 that no leakage has occurred, the process returns to step S401, and the position determination device 400 again acquires a measurement value related to the vibration of the pipe detected by each of the detection units 101.
- the position determination device 400 determines whether or not there is leakage from the pipe in the leakage presence / absence determination unit 140, and then extracts the feature amount based on the vibration of the pipe and the two detection units based on the feature amount. Determine the measurement position. That is, in the position determination device 400 according to the present embodiment, an operation that does not determine the measurement position is possible when there is no leakage from the pipe. Therefore, the position determination apparatus 400 in the present embodiment can suppress power consumption associated with execution of processing.
- position determination device 400 in the present embodiment can be combined with one or both of the position determination device 200 in the second embodiment of the present invention and the position determination device 300 in the third embodiment of the present invention. .
- the position determination device 400 is configured such that, for example, the measurement position determination unit 120 selects measurement positions by at least two detection units from the detection units from the detection unit 101-1 to the detection unit 101-n. be able to.
- the position determination apparatus 400 in this embodiment can be set as the structure which has a signal-to-noise ratio measurement part, for example.
- the position determination device 400 according to the present embodiment includes at least two detections based on the signal-to-noise ratio of the measurement value in each detection unit calculated by the measurement position determination unit 120 by the signal-to-noise ratio measurement unit. It can be set as the structure which determines the measurement position by a part.
- FIG. 13 is a diagram illustrating an example in which a detection unit is installed in a pipe in the leak detection system according to the fifth embodiment of the present invention.
- FIG. 14 is a flowchart showing the operation of the position determination apparatus in the fifth embodiment of the present invention.
- the configuration of the position determining device 500 can be the same as the configuration of the position determining device 100 in the first embodiment of the present invention.
- the feature amount extraction unit 110 can extract a feature value based on each of the measurement values related to vibration detected at a plurality of positions for at least one detection unit of the two detection units.
- the measurement position determination unit 120 can determine the measurement position by the detection unit based on the feature amounts related to vibration detected at the plurality of positions extracted by the feature amount extraction unit 110.
- the leak detection system 50 which has the position determination apparatus 500 in this embodiment can be comprised similarly to the leak detection system 10 in 1st Embodiment.
- step S501 two detection units that are measurement position determination targets in the position determination apparatus 500 according to the present embodiment are installed in the pipe.
- the position determination device 100 acquires a measurement value related to the vibration of the pipe detected by each of the detection units 101 (step S502).
- the feature quantity extraction unit 110 extracts a feature quantity based on the measurement value related to vibration acquired in step S502 (step S503).
- step S502 and step S503 can be the same as step S101 and step S102 in the first embodiment of the present invention, for example.
- the measurement position determination unit 120 determines whether or not the difference between the feature values extracted based on the vibration of the pipe detected by each of the two detection units 101 is equal to or less than a predetermined threshold (step S504).
- the measurement position determination unit 120 specifies the positions of the two detection units 101 installed in step S501 as the measurement positions (step S505). .
- the two detection units that are measurement position determination targets in the position determination device 500 in the present embodiment change the measurement position. Installed again in the pipe. Then, the position determining device 500 performs the operations after step S502 again. The position determination device 500 can repeat this operation until the difference between the feature values is equal to or less than a predetermined threshold value.
- the position determination apparatus 500 in this embodiment can specify the measurement positions of the two detection units 101 by other operations.
- the position determination device 500 extracts a feature value based on vibration detected at a plurality of measurement positions for each of the two detection units 101, and determines the position where the difference in the feature amount is minimized as the two detection units. 101 can be specified as the measurement position.
- the position determination device 500 is characterized by the feature amount extraction unit 110 based on each of the measurement values related to vibration detected at a plurality of positions for at least one detection unit of the two detection units. The value can be extracted. Then, the measurement position determination unit 120 can determine the measurement position by the detection unit based on the feature amounts related to vibration detected at the plurality of positions extracted by the feature amount extraction unit 110. Therefore, the position determination device 500 determines whether the difference between the feature values obtained from the measurement values of the two detection units 101 installed in the pipe is equal to or less than the threshold value until the difference between the feature values becomes equal to or less than the threshold value. The measurement position by the unit 101 can be changed and repeated. Therefore, by using the position determination device 100 according to the present embodiment, even when there are two detection units 101, it is possible to determine the measurement position by the detection unit that can specify the leakage position with high accuracy.
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Abstract
Description
本発明の各実施形態について、添付の図面を参照して説明する。
なお、本発明の各実施形態において、各装置の各構成要素は、機能単位のブロックを示している。各装置の各構成要素は、例えば図15に示すような情報処理装置1000とソフトウェアとの任意の組み合わせにより実現することができる。情報処理装置1000は、一例として、以下のような構成を含む。
・ROM(Read Only Memory)1002
・RAM(Ramdom Access Memory)1003
・RAM1003にロードされるプログラム1004
・プログラム1004を格納する記憶装置1005
・記憶媒体1006の読み書きを行うドライブ装置1007
・通信ネットワーク1009と接続する通信インターフェース1008
・データの入出力を行う入出力インターフェース1010
・各構成要素を接続するバス1011
また、各装置の実現方法には様々な変形例がある。例えば、各装置は、専用の装置として実現することができる。また、各装置は、複数の装置の組み合わせにより実現することができる。
計測位置決定部120は、より詳細な一例として、次のように検知部101による計測位置をそれぞれ決定する。配管のいずれかの場所で漏洩が生じていることが想定される場合には、配管の複数の地点において検知された配管の振動に基づいて、上述した特徴量がそれぞれ特徴量抽出部110にて抽出される。配管の複数の地点における配管の振動は、例えば、任意の数の検知部101を配管に沿って移動させる等して、各々の地点において振動を検知することで得られる。計測位置決定部120は、このようにして抽出された配管の複数の地点における特徴量を参照して、当該特徴量によって表される振動の波形の類似性が高いと判断される2つの特徴量を特定する。そして、当該特徴量に対応する振動が検知された2つの地点を、検知部101による計測位置として決定する。なお、計測位置決定部120は、上述した振動の波形の類似性に関する所定の条件を満たす3つ以上の地点を、検知部101による計測位置として決定してもよい。
計測位置決定部120は、一例として、特徴量抽出部110で抽出した検知部101の各々の特徴量の相違が所定の閾値以下である位置を、検知部101の各々による計測位置とする。例えば、特徴量抽出部110が配管の振動の位相を特徴量として抽出した場合、計測位置決定部120は、各々の検知部101から抽出した位相の差が閾値以下である位置を、検知部101の各々による計測位置とすることができる。これは、特徴量抽出部110で抽出した検知部101の各々の特徴量の相違が閾値以下である位置に検知部を設置することで、検知部101の各々によって検出する振動の波形の類似性が高まるからである。また、計測位置決定部120は、検知部101の各々による計測位置を決定する場合に、配管の振動を検知可能な所定の地点を検知部101の各々による計測位置とすることができる。また、計測位置決定部120は、検知部101の各々による計測位置を決定する場合に、配管の振動を検知可能な所定の範囲を検知部101の各々による計測位置とすることができる。更に、計測位置決定部120は、上述した閾値を、例えば検知部101の各々が振動の検知対象とする配管の種類、口径又は材質等に基づいて適宜定めることができる。
計測位置決定部120によって検知部101の各々による計測位置が決定されると、その計測位置に配置された検知部101を用いて、流体の配管からの漏洩位置の特定が行われる。この漏洩位置の特定に関する詳細は後述する。
(本実施形態における位置決定装置を有する漏洩検知システムの例)
次に、本実施形態における位置決定装置を有する漏洩検知システム10の構成について説明する。図3は、本発明の第1の実施形態における漏洩検知システムを示す図である。図4は、本発明の第1の実施形態における漏洩検知システムにて検知部を配管に設置した例を示す図である。図5は、本発明の第1の実施形態における漏洩検知システムの動作を示すフローチャートである。
(第2の実施形態)
続いて、本発明の第2の実施形態について説明する。図6は、本発明の第2の実施形態における位置決定装置を示す図である。図7は、本発明の第2の実施形態における位置決定装置にて計測位置の決定対象となる検知部を配管に設置した例を示す図である。図8は、本発明の第2の実施形態における位置決定装置の動作を示すフローチャートである。
計測位置決定部120は、この場合に、例えば検知部101-3及び検知部101-4の各々にて検出された配管の振動に基づいて抽出された特徴量の相違(以下「第1の相違」とする)を求める。また、計測位置決定部120は、例えば検知部101-2及び検知部101-5の各々にて検出された配管の振動に基づいて抽出された特徴量の相違(以下「第2の相違」とする)を求める。そして、計測位置決定部120は、例えば第1の相違と第2の相違とを比較する。この場合に、第2の相違の方が小さいとすると、計測位置決定部120は、検知部101-2及び検知部101-5の組を、2つの検知部として選択することが可能となる。
(第3の実施形態)
続いて、本発明の第3の実施形態について説明する。図9は、本発明の第3の実施形態における位置決定装置を示す図である。図10は、本発明の第3の実施形態における位置決定装置の動作を示すフローチャートである。
(第4の実施形態)
続いて、本発明の第4の実施形態について説明する。図11は、本発明の第4の実施形態における位置決定装置を示す図である。図12は、本発明の第4の実施形態における位置決定装置の動作を示すフローチャートである。
(第5の実施形態)
続いて、本発明の第5の実施形態について説明する。図13は、本発明の第5の実施形態における漏洩検知システムにて検知部を配管に設置した例を示す図である。図14は、本発明の第5の実施形態における位置決定装置の動作を示すフローチャートである。
100、200、300、400、500 位置決定装置
101 検知部
102 漏洩位置特定部
110 特徴量抽出部
120 計測位置決定部
130 信号対雑音比測定部
140 漏洩有無判定部
1000 情報処理装置
1001 CPU
1002 ROM
1003 RAM
1004 プログラム
1005 記憶装置
1006 記憶媒体
1007 ドライブ装置
1008 通信インターフェース
1009 通信ネットワーク
1010 入出力インターフェース
1011 バス
Claims (10)
- 検知手段によって検出された配管の振動に基づいて、検出した前記振動の各々に関して特徴量をそれぞれ抽出する特徴量抽出手段と、
前記特徴量に基づいて、少なくとも2つの前記検知手段による計測位置を決定する計測位置決定手段とを有する、位置決定装置。 - 前記計測位置決定手段は、前記特徴量のそれぞれが、前記特徴量に対応する振動の波形の類似性に関する所定の条件を満たす場合に、前記検知手段が前記振動を検出した位置を前記計測位置とする、請求項1に記載の位置決定装置。
- 前記計測位置決定手段は、2つの前記検知手段によって検出された前記振動の各々に関する前記特徴量のそれぞれの相違が所定の閾値以下である場合に、前記2つの前記検知手段が前記振動を検出した位置を前記計測位置とする、請求項1又は2に記載の位置決定装置。
- 前記計測位置決定手段は、複数の前記検知手段から少なくとも2つの前記検知手段を特定することで、前記少なくとも2つの前記検知手段による計測位置を決定する、請求項1から3のいずれか一項に記載の位置決定装置。
- 前記検知手段によってそれぞれ検出した配管の振動に関する計測値について、各々の信号対雑音比を算出する信号対雑音比測定手段を有し、
前記計測位置決定手段は、前記特徴量及び前記信号対雑音比測定手段にて算出した各々の前記検知手段による計測値の信号対雑音比に基づいて、少なくとも2つの検知手段による計測位置を決定する、請求項1から4のいずれか一項に記載の位置決定装置。 - 配管のからの流体の漏洩有無を判定する漏洩有無判定手段を有し、
前記漏洩有無判定手段が配管の漏洩があると判定した場合に、前記特徴量抽出手段は特徴量を抽出し、前記計測位置決定手段は少なくとも2つの前記検知手段による計測位置を決定する、請求項1から5のいずれか一項に記載の位置決定装置。 - 前記特徴量抽出手段は、少なくとも1つの前記検知手段について、複数の位置で検知した振動に関する計測値の各々に基づいて前記特徴値を抽出し、
前記計測位置決定手段は、前記特徴量抽出手段によって抽出した前記複数の位置における振動に関する前記特徴量に基づいて、前記検知手段による計測位置を決定する、請求項1から6のいずれか一項に記載の位置決定装置。 - 請求項1から7のいずれか一項に記載の位置決定装置と、
前記位置決定装置により決定した位置にある2つの前記検知手段によって検出した配管の振動に基づいて配管からの流体の漏洩位置を特定する漏洩位置特定手段とを有する、漏洩検知システム。 - 検知手段によって検出された配管の振動に基づいて、検出した前記振動の各々に関して特徴量をそれぞれ抽出し、
前記特徴量に基づいて、少なくとも2つの前記検知手段による計測位置を決定する、位置決定方法。 - コンピュータに、
検知手段によって検出された配管の振動に基づいて、検出した前記振動の各々に関して特徴量をそれぞれ抽出する処理と、
前記特徴量に基づいて、少なくとも2つの前記検知手段による計測位置を決定する処理とを実行させるプログラムを格納した、コンピュータ読み取り可能記録媒体。
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KR102038689B1 (ko) * | 2018-06-14 | 2019-10-30 | 한국원자력연구원 | 거리차-주파수 분석을 이용한 배관의 누설 감지장치 및 방법 |
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US20170102286A1 (en) | 2017-04-13 |
GB2541149A (en) | 2017-02-08 |
US10458878B2 (en) | 2019-10-29 |
GB201620526D0 (en) | 2017-01-18 |
GB2541149B (en) | 2020-07-15 |
JPWO2015194137A1 (ja) | 2017-04-20 |
JP6652054B2 (ja) | 2020-02-19 |
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