WO2020255358A1 - 光ファイバセンシングシステム及び音源位置特定方法 - Google Patents

光ファイバセンシングシステム及び音源位置特定方法 Download PDF

Info

Publication number
WO2020255358A1
WO2020255358A1 PCT/JP2019/024599 JP2019024599W WO2020255358A1 WO 2020255358 A1 WO2020255358 A1 WO 2020255358A1 JP 2019024599 W JP2019024599 W JP 2019024599W WO 2020255358 A1 WO2020255358 A1 WO 2020255358A1
Authority
WO
WIPO (PCT)
Prior art keywords
sound
optical fiber
area
monitoring target
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/024599
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
小島　崇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to PCT/JP2019/024599 priority Critical patent/WO2020255358A1/ja
Priority to JP2021528583A priority patent/JP7318706B2/ja
Priority to US17/619,885 priority patent/US20220357421A1/en
Publication of WO2020255358A1 publication Critical patent/WO2020255358A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic or infrasonic waves
    • G01S5/20—Position of source determined by a plurality of spaced direction-finders
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
    • G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic or infrasonic waves
    • G01S5/22—Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
    • G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors

Definitions

  • the present disclosure relates to an optical fiber sensing system and a sound source position identification method.
  • optical fiber sensing that uses an optical fiber as a sensor. Since the optical fiber can superimpose sound on the optical signal transmitted through the optical fiber, it is possible to detect the sound by using the optical fiber.
  • Patent Document 1 describes a device that detects an abnormal sound such as a gas leakage sound by using an optical fiber laid inside a gas pipe.
  • a plurality of photoacoustic medium units are connected via an optical fiber inside a gas pipe, and the position of the photoacoustic medium unit that detects an abnormal sound is regarded as a position where an abnormal sound is generated. There is.
  • the device described in Patent Document 1 regards the position of the photoacoustic medium portion that detects the abnormal sound as the generation position of the abnormal sound, only when there is a sound source of the abnormal sound on the optical fiber. , It is possible to specify the position of the sound source. Therefore, the device described in Patent Document 1 has a problem that the position of the sound source cannot be specified when the sound source is located at a place away from the optical fiber.
  • an object of the present disclosure is to solve the above-mentioned problems and to provide an optical fiber sensing system and a sound source position specifying method capable of specifying the position of a sound source located away from the optical fiber.
  • the optical fiber sensing system is An optical fiber that is arranged so as to face multiple directions and detects the sound generated in the monitoring area, A receiving unit that receives an optical signal on which the sound is superimposed from the optical fiber, and A specific unit that analyzes the distribution of the sound detected by the optical fiber based on the optical signal and identifies the generation position where the sound is generated based on the analyzed distribution of the sound. To be equipped.
  • the sound source position identification method is A step in which optical fibers arranged so as to face multiple directions detect sound generated in the monitoring area, and A step of receiving an optical signal on which the sound is superimposed from the optical fiber, A specific step of analyzing the distribution of the sound detected by the optical fiber based on the optical signal and identifying the generation position where the sound is generated based on the analyzed distribution of the sound. including.
  • FIG. 5 is a diagram showing an example in which a specific unit according to the first embodiment uses pattern matching to determine whether or not a sound detected by an optical fiber is a monitored sound.
  • FIG. 5 is a diagram showing an example of a method in which a specific unit according to the first embodiment specifies a position where a monitored sound is generated.
  • FIG. 5 is a diagram showing an example of a method in which a specific unit according to the first embodiment specifies a position where a monitored sound is generated. It is a flow chart which shows the operation example of the optical fiber sensing system which concerns on Embodiment 1.
  • FIG. It is a figure which shows the structural example of the specific part which concerns on Embodiment 2.
  • FIG. 1 It is a figure which shows the example of the GUI screen which the notification unit which concerns on Embodiment 4 uses for notification. It is a flow chart which shows the operation example of the optical fiber sensing system which concerns on Embodiment 4. FIG. It is a block diagram which shows an example of the hardware composition of the computer which realizes an optical fiber sensing device.
  • the optical fiber sensing system includes an optical fiber 10, a receiving unit 20, and a specific unit 30.
  • the optical fiber 10 is arranged in the monitored area.
  • the monitored area may be, for example, a nursery school, an animal breeding facility, a theme park, a prison, an airport, and the surrounding area, but is not limited thereto.
  • the optical fiber 10 may be embedded in the ground, attached to the ground, or overhead-wired by a utility pole or the like, as long as the monitored area is outdoors.
  • the optical fiber 10 may be attached to a floor, a wall, a ceiling, or the like, or may be embedded, as long as the monitored area is indoors.
  • the optical fiber 10 is arranged in the monitored area so as to face a plurality of directions.
  • the optical fibers 10 are arranged in a curved line, the optical fibers 10 inevitably face a plurality of directions.
  • the optical fiber 10 even if the optical fiber 10 is bent and arranged at one or more places, the optical fiber 10 inevitably faces a plurality of directions.
  • the present invention is not limited to the examples of FIGS. 2 and 3, and the optical fiber 10 may be oriented in a plurality of directions by a method other than those of FIGS. 2 and 3.
  • only one optical fiber 10 may be provided, or a plurality of optical fibers 10 may be provided.
  • one receiving unit 20 may be provided for each of the plurality of optical fibers 10, or a plurality of receiving units 20 corresponding to each of the plurality of optical fibers 10 may be provided. Is also good.
  • the receiving unit 20 incidents pulsed light on the optical fiber 10.
  • the receiving unit 20 receives the reflected light or scattered light generated as the pulsed light is transmitted through the optical fiber 10 as return light via the optical fiber 10.
  • the vibration of the sound causes the optical fiber 10 to shake (distort), so that the wavelength of the return light transmitted by the optical fiber 10 changes.
  • the sound generated around the optical fiber 10 is superimposed on the return light transmitted by the optical fiber 10. Therefore, the optical fiber 10 can detect the sound generated around the optical fiber 10.
  • the optical fiber 10 detects the sound and superimposes it on the return light for transmission, and the receiving unit 20 returns the sound detected by the optical fiber 10 on top of it. You will receive light.
  • the optical fiber 10 detects sound at a plurality of points on the optical fiber 10. At this time, the intensity of the sound detected at each of the plurality of points on the optical fiber 10 and the time at which the sound is detected are different from each other depending on the positional relationship between the sound source position of the sound and each of the plurality of points. become.
  • the specific unit 30 analyzes the distribution of the sound detected by the optical fiber 10 (the intensity of the detected sound and the time when the sound is detected) based on the return light received by the receiving unit 20. Based on the analyzed sound distribution, the position where the sound is generated is specified.
  • the specific unit 30 refers to a sound generated in the vicinity of the optical fiber 10 that corresponds to a monitoring target registered in advance in the specific unit 30 (hereinafter, referred to as a monitoring target sound).
  • a monitoring target sound a sound generated in the vicinity of the optical fiber 10 that corresponds to a monitoring target registered in advance in the specific unit 30
  • the case where the occurrence position of the occurrence is specified will be described as an example.
  • the present invention is not limited to this, and the specific unit 30 may specify a sound generation position other than the monitored sound.
  • the objects to be monitored are, for example, a person who fired, a person who screamed, a person who roamed a predetermined area, and the like. In these cases, the monitored sounds are gun sound, scream sound, and footstep sound, respectively.
  • the monitoring target and the monitoring target sound are not limited to these.
  • the identification unit 30 according to the first embodiment includes an extraction unit 31, a matching unit 32, and a sound generation position identification unit 33.
  • the extraction unit 31 extracts the sound component detected at the sensing point from the return light received by the reception unit 20.
  • the sound generation position is specified by using the sound detected by three or more sensing points on the optical fiber 10. Therefore, the extraction unit 31 extracts the sound components detected at each of the three or more sensing points.
  • the time difference between the time when the receiving unit 20 incidents the pulsed light on the optical fiber 10 and the time when the return light on which the sound is superimposed is received by the receiving unit 20 is the optical fiber 10 in which the sound is detected. It is determined according to the upper position (distance of the optical fiber 10 from the receiving unit 20). Therefore, for example, the extraction unit 31 holds the information of the time difference according to the position of the sensing point for each of three or more sensing points on the optical fiber 10, so that the return received by the receiving unit 20 It can be determined whether or not the light is the return light on which the sound detected at the sensing point is superimposed. Therefore, the extraction unit 31 extracts the component of the sound from the return light that is determined that the sound detected at the sensing point is superimposed.
  • the matching unit 32 determines whether or not the sound detected by the sensing point extracted by the extraction unit 31 is a monitoring target sound corresponding to a pre-registered monitoring target. For this determination, for example, pattern matching can be used.
  • the matching unit 32 converts the sound extracted by the extraction unit 31 into acoustic data as shown in FIG. 5 using a distributed acoustic sensor (Distributed Acoustic Sensor).
  • the acoustic data shown in FIG. 5 is acoustic data of the sound detected at the sensing point, and the horizontal axis represents time and the vertical axis represents sound intensity.
  • data for matching the monitored sound is prepared in advance.
  • the matching data may be held inside the specific unit 30 or may be held outside. Then, as shown in FIG.
  • the matching unit 32 compares the pattern of the acoustic data converted above with the pattern of the matching data of the monitored sound. When the matching unit 32 matches the pattern of the matching data of the monitored sound, the matching unit 32 determines that the acoustic data converted above is the acoustic data of the monitored sound.
  • FIG. 6 shows an example in which the monitored sound is a gun sound. In the example shown in FIG. 6, the acoustic data converted above has a pattern that substantially matches the acoustic data of the gun sound. Therefore, the matching unit 32 determines that the sound detected at the sensing point is the monitoring target sound (gun voice sound). When the sound detected at the sensing point is the monitored sound, the matching unit 32 passes the acoustic data of the monitored sound detected at the sensing point to the sound generation position specifying unit 33.
  • the sound generation position specifying unit 33 distributes (detects) the monitored sound detected at three or more sensing points based on the acoustic data of the monitored sound detected at three or more sensing points on the optical fiber 10. The intensity of the sound and the time when the sound is detected) are analyzed, and the position where the monitored sound is generated is specified based on the analyzed distribution of the monitored sound.
  • the optical fibers 10 are arranged in a curved line, and three sensing points S1 to S3 are provided on the optical fiber 10. This is just an example, and three or more sensing points may be provided on the optical fiber 10.
  • the sound generation position specifying unit 33 selects any two sensing points. Here, the sensing points S1 and S2 are selected. Then, the sound generation position specifying unit 33 determines the monitoring target sound detected at the two sensing points S1 and S2 from the distribution (intensity and time) of the monitoring target sound detected at the two sensing points S1 and S2. The intensity difference and time difference are derived, and the generation position of the monitored sound is estimated based on the derived intensity difference and time difference.
  • the position where the monitored sound is generated is estimated to be any position on the line P12.
  • the specific unit 30 selects two sensing points whose combination is different from the two points selected above.
  • the sensing points S2 and S3 are selected.
  • the sound generation position specifying unit 33 estimates the generation position of the monitoring target sound from the distribution (intensity and time) of the monitoring target sound detected at the two sensing points S2 and S3 in the same manner as described above.
  • the position where the monitored sound is generated is estimated to be any position on the line P23.
  • the sound generation position specifying unit 33 specifies the position where the line P12 and the line P23 intersect as the generation position of the monitored sound.
  • the optical fiber 10 is arranged in a rectangular shape around the facility to be monitored, and three sensing points S1 to S3 are provided on each of the three different sides of the rectangular shape on the optical fiber 10. Has been done. This is just an example, and three or more sensing points may be provided on the optical fiber 10.
  • the method of specifying the generation position of the monitored sound is the same as that of FIG. 7. That is, first, the sound generation position specifying unit 33 determines the monitoring target sound based on the distribution (intensity and time) of the monitoring target sound detected at any two sensing points (here, sensing points S1 and S2). Is estimated (here, it is estimated to be any position on the line P12).
  • the sound generation position specifying unit 33 determines the distribution (intensity and time) of the monitored sound detected at two sensing points (here, sensing points S2 and S3) whose combination is different from the above two points. Based on this, the position where the monitored sound is generated is estimated (here, it is estimated to be any position on the line P23). Then, the sound generation position specifying unit 33 specifies the position where the line P12 and the line P23 intersect as the generation position of the monitored sound.
  • the optical fiber 10 detects the monitored sound generated around the optical fiber 10 (step S11). This monitored sound is superposed on the return light transmitted through the optical fiber 10 and transmitted. Subsequently, the receiving unit 20 receives from the optical fiber 10 the return light on which the monitoring target sound detected by the optical fiber 10 is superimposed (step S12).
  • the specific unit 30 analyzes the distribution of the monitored sound detected by the optical fiber 10 based on the return light received by the receiving unit 20, and the monitored sound is based on the analyzed distribution of the monitored sound. Is specified (step S13).
  • the specifying unit 30 may specify the generation position of the monitored sound by using, for example, the methods of FIGS. 7 and 8 described above.
  • the receiving unit 20 receives the return light on which the sound detected by the optical fiber 10 is superimposed from the optical fiber 10.
  • the identification unit 30 analyzes the distribution of the sound detected by the optical fiber 10 based on the received return light, and identifies the generation position where the sound is generated based on the analyzed sound distribution. Thereby, even when the sound source is located at a place away from the optical fiber 10, the position of the sound source can be specified.
  • the optical fiber sensing system according to the second embodiment has the same system configuration itself as the first embodiment described above, but extends the functions of the specific unit 30.
  • the specific unit 30 according to the second embodiment is different from the configuration of FIG. 4 of the first embodiment described above in that the sound generation area identification unit 34 is added. ..
  • the sound generation area specifying unit 34 identifies the generation area where the monitored sound is generated. For example, the sound generation area specifying unit 34 specifies whether the monitoring target sound generation area is inside or outside the monitoring target area. Alternatively, when the inside of the monitoring target area is divided into a plurality of areas, the sound generation area specifying unit 34 specifies which area inside the monitoring target area the monitoring target sound generation area is.
  • the sound generation area specifying unit 34 may specify the monitoring target sound generation area based on the monitoring target sound generation position specified by the sound generation position specifying unit 33.
  • the sound generation area specifying unit 34 holds in advance a corresponding table in which the position specified by the sound generation position specifying unit 33 and the area are associated with each other, and uses the corresponding table to specify the sound generation position.
  • the monitoring target sound generation area may be specified from the monitoring target sound generation position specified by the unit 33.
  • the sound generation area specifying unit 34 can generate the monitoring target sound even if the monitoring target sound generation position specified by the sound generation position specifying unit 33 is not used. It is possible to specify which of the areas separated by the two or more optical fibers 10 the generation area is. In this case, the sound generation area specifying unit 34 determines the distribution of the monitored sound detected at each sensing point on the two or more optical fibers 10 (the intensity of the detected sound and the time when the sound is detected). Analyze and identify the area where the monitored sound is generated based on the analyzed distribution of the monitored sound.
  • two or more optical fibers 10 may be arranged substantially in parallel, and two or more optical fibers 10 may be arranged as in the case of specifying the position where the monitored sound is generated. It is not always necessary to arrange each of the optical fibers 10 so as to face a plurality of directions.
  • two optical fibers 10a and 10b are arranged in a curved line and substantially in parallel. Note that this is an example, and two or more optical fibers 10 may be arranged substantially in parallel. Further, the optical fiber 10a is arranged at the boundary between the areas A and B, and the optical fiber 10b is arranged at the boundary between the areas B and C. Further, sensing points Sa and Sb are provided on each of the two optical fibers 10a and 10b.
  • the sound generation area identification unit 34 is the difference in intensity of the monitored sound detected at the two sensing points Sa and Sb from the distribution (intensity and time) of the monitored sound detected at the two sensing points Sa and Sb. And the time difference is derived.
  • the sound generation area specifying unit 34 specifies that the monitoring target sound generation area is the area A.
  • the sound source of the monitored sound is the sound source 2 in the area BA
  • the sensing point Sa has a smaller time difference in detecting the monitored sound than the sensing point Sb, and the intensity of the detected monitored sound is also high. It is about the same. Therefore, when such detection is performed at the sensing points Sa and Sb, the sound generation area specifying unit 34 specifies that the monitoring target sound generation area is the area B.
  • two optical fibers 10a and 10b are arranged in a rectangular shape and substantially in parallel around the facility to be monitored. That is, the two optical fibers 10a and 10b are arranged at the boundary between the inside and the outside of the facility. Further, sensing points Sa and Sb are provided on each of the two optical fibers 10a and 10b. Also in the example of FIG. 12, the method of specifying the area where the monitored sound is generated is the same as that of FIG. That is, the sound generation area specifying unit 34 derives the intensity difference and the time difference of the monitored sound detected at the two sensing points Sa and Sb.
  • the sensing point Sa detects the monitored sound earlier than the sensing point Sb, and the intensity of the detected monitored sound is also increased. Therefore, when such detection is performed at the sensing points Sa and Sb, the sound generation area specifying unit 34 identifies that the monitoring target sound generation area is inside the facility (that is, inside the monitoring target area). Further, when the sound source of the monitored sound is the sound source 2 outside the facility, the sensing point Sb detects the monitored sound earlier than the sensing point Sa, and the intensity of the detected monitored sound is also increased. Therefore, when such detection is performed at the sensing points Sa and Sb, the sound generation area specifying unit 34 identifies that the monitoring target sound generation area is outside the facility (that is, outside the monitoring target area).
  • the optical fiber 10 is arranged inside the monitored area, and the optical fiber 10 divides the inside of the monitored area into a plurality of areas.
  • two optical fibers 10a and 10b are arranged substantially in parallel in the uniaxial direction, and the inside of the monitored area is divided into three areas A to C. Further, sensing points Sa and Sb are provided on each of the two optical fibers 10a and 10b.
  • four optical fibers 10a to 10d are arranged in the biaxial direction, and the inside of the monitored area is divided into nine areas A to I in a matrix.
  • the two optical fibers 10a and 10b are arranged in a certain axial direction and substantially parallel to each other, and the two optical fibers 10c and 10d are arranged in the axial direction substantially orthogonal to the two optical fibers 10a and 10b. And they are arranged substantially in parallel.
  • sensing points Sa to Sd are provided on each of the four optical fibers 10a to 10d. Further, the sensing points Sa to Sd are arranged near the center of the optical fibers 10a to 10d.
  • the method of specifying the area where the monitored sound is generated is the same as that of FIG.
  • the method of specifying the monitoring target sound generation area is the same as that of FIG. 11 except that the number of sensing points is different. That is, for example, in the example of FIG. 14, the sound generation area specifying unit 34 derives the intensity difference and the time difference of the monitored sound detected at the four sensing points Sa to Sd. For example, when the sound source of the monitored sound is in the area B, the sensing point Sa detects the monitored sound earlier than the sensing point Sb, and the intensity of the detected monitored sound is also increased.
  • the sensing point Sc has a smaller time difference in detecting the monitored sound than the sensing point Sd, and the intensity of the detected monitored sound is about the same. Therefore, when such detection is performed at the sensing points Sa to Sd, the sound generation area specifying unit 34 specifies that the monitoring target sound generation area is the area B.
  • the inside of the monitored area can be divided into a plurality of areas, and which of the plurality of areas the monitored sound is generated is. Can be identified.
  • the area can be flexibly divided according to the laying mode of the optical fiber, the setting position of the sensing point, and the like. Therefore, if there is a predetermined area such as an inaccessible area or a dangerous area in the monitored area, the optical fiber 10 is arranged according to the predetermined area to monitor the predetermined area or the area adjacent to the predetermined area. It is possible to identify that the target sound has occurred. This makes it possible to detect intrusion into a predetermined area.
  • the optical fiber 10 detects the monitored sound generated around the optical fiber 10 (step S21). This monitored sound is superposed on the return light transmitted through the optical fiber 10 and transmitted. Subsequently, the receiving unit 20 receives from the optical fiber 10 the return light on which the monitoring target sound detected by the optical fiber 10 is superimposed (step S22).
  • the specific unit 30 analyzes the distribution of the monitored sound detected by the optical fiber 10 based on the return light received by the receiving unit 20, and the monitored sound is based on the analyzed distribution of the monitored sound.
  • the area where the above occurred is specified (step S23).
  • the specifying unit 30 may specify the monitoring target sound generation area by using, for example, the methods of FIGS. 11 to 14 described above.
  • a step may be added in which the specific unit 30 specifies the generation position of the monitored sound based on the distribution of the monitored sound.
  • the specifying unit 30 may specify the monitoring target sound generation area based on the monitoring target sound generation position.
  • the receiving unit 20 receives from the optical fiber 10 the return light on which the sound detected by the optical fiber 10 is superimposed.
  • the specifying unit 30 analyzes the distribution of the sound detected by the optical fiber 10 based on the received return light, and identifies the generation area where the sound is generated based on the analyzed sound distribution.
  • the specifying unit 30 identifies the generation position where the sound is generated based on the analyzed distribution of the sound, and specifies the generation area where the sound is generated based on the specified generation position.
  • the optical fiber sensing system according to the third embodiment has the same system configuration itself as the first and second embodiments described above, but extends the functions of the specific unit 30.
  • the specific unit 30 according to the third embodiment is different in that the tracking unit 35 is added as compared with the configuration of FIG. 10 of the second embodiment described above.
  • the sound generation position specifying unit 33 repeatedly identifies the generation position of the monitored sound.
  • the sound generation position specifying unit 33 may specify the generation position of the monitored sound at an arbitrary timing, and this timing may be regular or irregular. Further, the sound generation position specifying unit 33 may repeat the identification of the generation position of the monitored sound until a certain period of time elapses, or may repeat until the identification of a certain number of times is completed.
  • the tracking unit 35 specifies the movement locus of the monitored target based on the time-series change of the generated position of the monitored sound specified by the sound generation position specifying unit 33. For example, when the monitored sound is the footsteps of a person wandering in a predetermined area, the sound generation position specifying unit 33 repeatedly identifies the generation position of the person's footsteps, and the tracking unit 35 of the person. The movement trajectory of the person is specified based on the time-series change of the position where the footstep sound is generated.
  • the sound generation position specifying unit 33 repeatedly identifies the generation position of the monitored sound in the same manner as in the example of FIG. 7 described above. Therefore, the tracking unit 35 identifies the movement locus T of the monitoring target based on the time-series change of the generation position of the monitoring target sound.
  • the sound generation position specifying unit 33 repeatedly identifies the generation position of the monitored sound in the same manner as in the above-mentioned example of FIG. Therefore, the tracking unit 35 identifies the movement locus T of the monitoring target based on the time-series change of the generation position of the monitoring target sound.
  • the movement locus T of the monitored object indicates that the monitored object has moved from the inside to the outside of the facility.
  • the sound generation position specifying unit 33 may not be able to specify the generation position of the monitored sound before a certain period of time elapses or before a certain number of times of identification is completed. For example, when the monitoring target moves away from the optical fiber 10, or when the monitoring target sound is mixed with other sounds and the optical fiber 10 cannot detect the monitoring target sound, the position where the monitoring target sound is generated is specified. become unable. In this case, the tracking unit 35 may estimate the direction and position where the monitored object will move next based on the movement locus of the monitored object that has already been specified.
  • the identification unit 30 will be described as repeating the identification of the generation position of the monitored sound until a certain period of time elapses.
  • the optical fiber 10 detects the monitored sound generated around the optical fiber 10 (step S31). This monitored sound is superposed on the return light transmitted through the optical fiber 10 and transmitted. Subsequently, the receiving unit 20 receives from the optical fiber 10 the return light on which the monitoring target sound detected by the optical fiber 10 is superimposed (step S32).
  • the specific unit 30 analyzes the distribution of the monitored sound detected by the optical fiber 10 based on the return light received by the receiving unit 20, and the monitoring target is based on the analyzed distribution of the monitored sound.
  • the position where the sound is generated is specified (step S33).
  • the specifying unit 30 may specify the generation position of the monitored sound by using, for example, the methods of FIGS. 7 and 8 described above.
  • the specifying unit 30 repeats specifying the position where the monitored sound is generated until a certain period of time elapses (step S34). That is, if a certain period of time has not passed since the monitoring target sound generation position was first specified (No in step S34), the specifying unit 30 returns to step S33 to specify the monitoring target sound generation position. Do.
  • the identification unit 30 specifies the movement locus of the monitoring target based on the time-series change of the generation position of the monitoring target sound specified above (step S35).
  • the specifying unit 30 may specify the movement locus of the monitoring target by using, for example, the methods of FIGS. 17 and 18 described above.
  • the specific unit 30 specifies the movement locus of the monitoring target after a certain period of time has elapsed, but the present invention is not limited to this.
  • the identification unit 30 can specify the movement locus of the monitoring target if the generation positions of the monitoring target sounds are known at two or more locations. Therefore, the specific unit 30 may specify the movement locus of the monitoring target before a certain period of time elapses.
  • a step may be added in which the specific unit 30 specifies the area where the monitored sound is generated.
  • the specifying unit 30 may specify the monitoring target sound generation area based on the distribution of the monitoring target sound, or specify the monitoring target sound generation area based on the monitoring target sound generation position. You may.
  • the specifying unit 30 repeatedly identifies the position where the monitored sound is generated, and determines the movement locus of the monitored target based on the time-series change in the position where the monitored sound is generated. Identify. This makes it possible to track the monitoring target.
  • the sound generation position specifying unit 33 repeatedly identifies the monitoring target sound generation position, and the tracking unit 35 monitors based on the time-series change of the monitoring target sound generation position.
  • the movement trajectory of the target was specified, but it is not limited to this.
  • the sound generation area specifying unit 34 repeatedly identifies the monitoring target sound generation area, and the tracking unit 35 specifies the movement trajectory of the monitoring target based on the time-series change of the monitoring target sound generation area. Is also good.
  • the sound generation area specifying unit 34 repeatedly identifies the monitoring target sound generation area in the same manner as in the above-mentioned example of FIG. Therefore, the tracking unit 35 identifies the movement locus T of the monitoring target based on the time-series change of the monitoring target sound generation area.
  • the movement locus T of the monitoring target indicates that the monitoring target has moved from the area B to the area C.
  • the sound generation area specifying unit 34 repeatedly identifies the monitoring target sound generation area in the same manner as in the above-mentioned example of FIG. Therefore, the tracking unit 35 identifies the movement locus T of the monitoring target based on the time-series change of the monitoring target sound generation area.
  • the movement locus T of the monitoring target indicates that the monitoring target has moved from the area B to the area F via the area C.
  • the optical fiber sensing system according to the fourth embodiment is different in that the notification unit 40 is added as compared with the configuration of FIG. 1 of the above-described first to third embodiments. ..
  • the notification unit 40 determines whether or not a predetermined event has occurred based on the generation position or area of the monitored sound specified by the specific unit 30, and the movement locus of the monitored target, and when the predetermined event occurs. Is notified to.
  • the notification destination may be, for example, a monitoring system or a monitoring room that monitors the monitored area.
  • the notification method may be, for example, a method of displaying a GUI (Graphical User Interface) screen on the display or monitor of the notification destination, or a method of outputting a message by voice from the speaker of the notification destination.
  • the specific unit 30 according to the fourth embodiment may have any of the configurations shown in FIGS. 4, 10 and 16 of the above-described first to third embodiments.
  • the notification unit 40 may notify the generation position or area of the monitoring target sound specified by the specific unit 30 when a dangerous sound such as a gunshot sound or a screaming sound is detected as the monitoring target sound. ..
  • FIG. 23 shows an example in which the notification at this time is performed on the GUI screen.
  • FIG. 23 shows an example of a GUI screen when the monitored sound is a gun sound.
  • the notification unit 40 may perform notification when the monitoring target sound generation position or generation area specified by the specific unit 30 is a predetermined area such as an inaccessible area or a dangerous area.
  • FIG. 24 shows an example in which the notification at this time is performed on the GUI screen.
  • FIG. 24 shows an example of a GUI screen when a predetermined area is an area I which is an inaccessible area.
  • the notification unit 40 may perform notification when the monitoring target sound generation position or generation area specified by the specific unit 30 is an adjacent area adjacent to a predetermined area such as an inaccessible area or a dangerous area. ..
  • FIG. 25 shows an example in which the notification at this time is performed on the GUI screen.
  • FIG. 25 shows an example of a GUI screen when a predetermined area is an area I which is an inaccessible area.
  • the notification unit 40 may perform notification when the generation position or generation area of the monitoring target sound specified by the specific unit 30 is outside the monitoring target area.
  • FIG. 26 shows an example in which the notification at this time is performed on the GUI screen.
  • FIG. 26 shows an example of a GUI screen when the monitored area is inside the facility.
  • the movement locus T of the monitoring target is specified by the same method as in the example of FIG. 18 described above.
  • the movement locus T of the monitoring target indicates that the monitoring target is heading outside the facility, which is the monitoring target area, and the monitoring target may go out of the facility.
  • the movement locus T of the monitoring target indicates that the monitoring target moves from the area B to the area C and the monitoring target moves out of the monitoring target area. Therefore, there is a risk that the monitored object will go out of the monitored area.
  • the notification unit 40 may perform notification when the movement locus T of the monitoring target is heading out of the monitoring target area, as in the examples shown in FIGS. 20 and 27.
  • FIG. 28 shows an example in which the notification at this time is performed on the GUI screen.
  • FIG. 28 shows an example of a GUI screen when the monitored area is inside the facility.
  • the movement locus T of the monitoring target is specified by the same method as in the example of FIG. 18 described above.
  • the movement locus T of the monitored target indicates that the monitored target is approaching the inaccessible area, and the monitored target may invade the inaccessible area.
  • the movement locus T of the monitoring target moves from the area B to the area F via the area C, and approaches the area I where the monitoring target is an inaccessible area. Since it indicates that the monitoring target is invading the area I.
  • the notification unit 40 may perform notification when the movement locus T of the monitoring target is close to a predetermined area such as an inaccessible area or a dangerous area. good.
  • FIG. 30 shows an example in which the notification at this time is performed on the GUI screen.
  • FIG. 30 shows an example of a GUI screen when a predetermined area is an inaccessible area inside the facility.
  • the predetermined event that triggers the notification unit 40 to notify is, for example, as follows.
  • -The monitoring target sound is detected-The monitoring target sound generation position or generation area is a predetermined area
  • the monitoring target sound generation position or generation area is an adjacent area adjacent to the predetermined area
  • -The position or area where the monitored sound is generated is outside the monitored area.
  • -The movement trajectory of the monitored target is toward the outside of the monitored area.
  • the movement trajectory of the monitored target approaches the specified area. What you are doing
  • the identification unit 30 will be described as repeating the identification of the generation position of the monitored sound until a certain period of time elapses.
  • steps S41 to S45 similar to steps S31 to S35 shown in FIG. 19 are performed.
  • the notification unit 40 determines whether or not a predetermined event has occurred based on the generation position of the monitored sound specified by the specific unit 30 and the movement locus of the monitored target, and when the predetermined event occurs. Notify (step S46).
  • the notification unit 40 may perform notification using, for example, the GUI screens of FIGS. 23 to 26, 28, and 30 described above.
  • the specific unit 30 specifies the movement locus of the monitoring target after a certain period of time has elapsed, but the movement locus of the monitoring target may be specified before the certain period of time elapses. Further, in FIG. 31, a step may be added in which the specific unit 30 specifies the area where the monitored sound is generated. In this case, the notification unit 40 may determine whether or not a predetermined event has occurred based on the monitoring target sound generation area specified by the specific unit 30.
  • the notification unit 40 states that a predetermined event has occurred based on the position or area where the monitoring target sound specified by the specific unit 30 is generated and the movement trajectory of the monitoring target. Notify when it is judged.
  • the predetermined event is, for example, the detection of a dangerous sound as a monitoring target sound.
  • a predetermined event such as the detection of a sound indicating danger occurs, it is possible to notify the fact.
  • the optical fiber sensing system according to the above embodiment can be applied in order to detect a sound indicating danger such as a gunshot sound or a screaming sound. Further, in this application example, when a sound indicating danger is detected, the position or area where the sound is generated may be notified.
  • the optical fiber sensing system in order to detect the escape of the kindergarten child and the invasion of a suspicious person into the nursery school, the optical fiber sensing system according to the above-described embodiment can be applied. Further, in this application example, when the escape of a kindergarten child or the invasion of a suspicious person is detected, a notification to that effect may be given.
  • the optical fiber sensing system according to the above-described embodiment is applied in order to detect the escape of the animal and the invasion of the animal into a predetermined area such as an inaccessible area. be able to. Further, in this application example, when an escape of an animal or an invasion into a predetermined area is detected, a notification to that effect may be given.
  • the optical fiber in order to detect the intrusion of a person into a predetermined area such as an inaccessible area or to detect unauthorized entry from a place other than the regular entrance, the optical fiber according to the above-described embodiment.
  • a sensing system can be applied. Further, in this application example, when intrusion into a predetermined area or unauthorized entry is detected, a notification to that effect may be given.
  • the optical fiber sensing system according to the above-described embodiment can be applied in order to detect the escape of the inmate and the suspicious behavior of the inmate. Further, in this application example, when the inmate's escape or suspicious behavior is detected, the fact may be notified.
  • the optical fiber sensing system according to the above-described embodiment can be applied. Further, in this application example, when a suspicious behavior is detected, a notification to that effect may be given.
  • the reception unit 20, the specific unit 30, and the notification unit 40 described above can be mounted on an optical fiber sensing device. Further, the optical fiber sensing device on which the receiving unit 20, the specifying unit 30, and the transmitting unit 40 are mounted can be realized as a computer.
  • the hardware configuration of the computer 50 that realizes the above-mentioned optical fiber sensing device will be described with reference to FIG. 32.
  • the computer 50 includes a processor 501, a memory 502, a storage 503, an input / output interface (input / output I / F) 504, a communication interface (communication I / F) 505, and the like.
  • the processor 501, the memory 502, the storage 503, the input / output interface 504, and the communication interface 505 are connected by a data transmission line for transmitting and receiving data to and from each other.
  • the processor 501 is, for example, an arithmetic processing unit such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit).
  • the memory 502 is, for example, a memory such as a RAM (Random Access Memory) or a ROM (Read Only Memory).
  • the storage 503 is, for example, a storage device such as an HDD (Hard Disk Drive), an SSD (Solid State Drive), or a memory card. Further, the storage 503 may be a memory such as a RAM or a ROM.
  • the storage 503 stores a program that realizes the functions of the components (reception unit 20, specific unit 30, and notification unit 40) included in the optical fiber sensing device. By executing each of these programs, the processor 501 realizes the functions of the components included in the optical fiber sensing device. Here, when executing each of the above programs, the processor 501 may read these programs on the memory 502 and then execute the programs, or may execute the programs without reading them on the memory 502. The memory 502 and the storage 503 also play a role of storing information and data held by the components included in the optical fiber sensing device.
  • Non-temporary computer-readable media include various types of tangible storage media.
  • Examples of non-temporary computer-readable media include magnetic recording media (eg, flexible disks, magnetic tapes, hard disk drives), opto-magnetic recording media (eg, opto-magnetic disks), CD-ROMs (Compact Disc-ROMs), CDs. -R (CD-Recordable), CD-R / W (CD-ReWritable), semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM.
  • the program also includes.
  • the computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • the input / output interface 504 is connected to the display device 5041, the input device 5042, the sound output device 5043, and the like.
  • the display device 5041 is a device that displays a screen corresponding to drawing data processed by the processor 501, such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube) display, and a monitor.
  • the input device 5042 is a device that receives an operator's operation input, and is, for example, a keyboard, a mouse, a touch sensor, and the like.
  • the display device 5041 and the input device 5042 may be integrated and realized as a touch panel.
  • the sound output device 5043 is a device such as a speaker that acoustically outputs sound corresponding to acoustic data processed by the processor 501.
  • the communication interface 505 sends and receives data to and from an external device.
  • the communication interface 505 communicates with an external device via a wired communication path or a wireless communication path.
  • Appendix 1 An optical fiber that is arranged so that it faces multiple directions and detects the sound generated in the monitoring area, A receiving unit that receives an optical signal on which the sound is superimposed from the optical fiber, and A specific unit that analyzes the distribution of the sound detected by the optical fiber based on the optical signal and identifies the generation position where the sound is generated based on the analyzed distribution of the sound.
  • An optical fiber sensing system (Appendix 2) The specific unit identifies the position where the sound corresponding to the pre-registered monitoring target is generated. The optical fiber sensing system according to Appendix 1.
  • the specific unit repeatedly identifies the sound generation position corresponding to the monitoring target, and specifies the movement locus of the monitoring target based on the time-series change of the generation position.
  • the optical fiber sensing system according to Appendix 2. (Appendix 4) Based on the analyzed distribution of the sound, the specific unit identifies the area where the sound corresponding to the monitoring target is generated.
  • the optical fiber sensing system according to Appendix 2 or 3. (Appendix 5) Based on the generation position, the specific unit identifies the generation area where the sound corresponding to the monitoring target is generated.
  • the specific unit repeatedly identifies the sound generation area corresponding to the monitoring target, and specifies the movement locus of the monitoring target based on the time-series change of the generation area.
  • a notification unit that notifies when the generation position is in a predetermined area is further provided.
  • a notification unit that notifies when the generation position is outside the monitoring area is further provided.
  • the optical fiber sensing system according to Appendix 2 or 3. (Appendix 9) A notification unit that notifies when the generation area is a predetermined area is further provided.
  • Appendix 14 A step in which optical fibers arranged so as to face multiple directions detect sound generated in the monitoring area, and A step of receiving an optical signal on which the sound is superimposed from the optical fiber, A specific step of analyzing the distribution of the sound detected by the optical fiber based on the optical signal and identifying the generation position where the sound is generated based on the analyzed distribution of the sound. Sound source position identification method including. (Appendix 15) In the specific step, the position where the sound corresponding to the pre-registered monitoring target is generated is specified. The method for specifying a sound source position according to Appendix 14.
  • the sound generation area corresponding to the monitoring target is repeatedly specified, and the movement locus of the monitoring target is specified based on the time-series change of the generation area.
  • the method for identifying a sound source position according to Appendix 17 or 18. (Appendix 20) Further including a notification step for notifying when the generation position is a predetermined area. The method for identifying a sound source position according to Appendix 15 or 16. (Appendix 21) Further including a notification step for notifying when the generation position is outside the monitoring area. The method for identifying a sound source position according to Appendix 15 or 16. (Appendix 22) Further including a notification step for notifying when the generation area is a predetermined area.
  • the method for specifying a sound source position according to any one of the items 17 to 19. (Appendix 23) A notification step for notifying when the generation area is outside the monitoring area is further included. The method for specifying a sound source position according to any one of the items 17 to 19. (Appendix 24) Further including a notification step for notifying when the movement locus is heading for a predetermined area. The method for identifying a sound source position according to Appendix 16 or 19. (Appendix 25) The optical fiber is arranged around the monitoring area. The method for specifying a sound source position according to any one of Appendix 14 to 24. (Appendix 26) The optical fiber is arranged in the monitoring area. The method for specifying a sound source position according to any one of Appendix 14 to 24.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Alarm Systems (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
PCT/JP2019/024599 2019-06-20 2019-06-20 光ファイバセンシングシステム及び音源位置特定方法 Ceased WO2020255358A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/JP2019/024599 WO2020255358A1 (ja) 2019-06-20 2019-06-20 光ファイバセンシングシステム及び音源位置特定方法
JP2021528583A JP7318706B2 (ja) 2019-06-20 2019-06-20 光ファイバセンシングシステム及び音源位置特定方法
US17/619,885 US20220357421A1 (en) 2019-06-20 2019-06-20 Optical fiber sensing system and sound source position identification method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/024599 WO2020255358A1 (ja) 2019-06-20 2019-06-20 光ファイバセンシングシステム及び音源位置特定方法

Publications (1)

Publication Number Publication Date
WO2020255358A1 true WO2020255358A1 (ja) 2020-12-24

Family

ID=74040290

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2019/024599 Ceased WO2020255358A1 (ja) 2019-06-20 2019-06-20 光ファイバセンシングシステム及び音源位置特定方法

Country Status (3)

Country Link
US (1) US20220357421A1 (https=)
JP (1) JP7318706B2 (https=)
WO (1) WO2020255358A1 (https=)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113702908A (zh) * 2021-09-01 2021-11-26 哈尔滨工程大学 一种基于pdh解调技术的高精度三维声源定位方案
WO2022185469A1 (ja) * 2021-03-04 2022-09-09 日本電気株式会社 工事検出装置、工事検出システム及び工事検出方法
WO2022208594A1 (ja) * 2021-03-29 2022-10-06 日本電気株式会社 空間センシング装置、空間センシングシステム及び空間センシング方法
JPWO2023073762A1 (https=) * 2021-10-25 2023-05-04
WO2023089692A1 (ja) * 2021-11-17 2023-05-25 日本電気株式会社 異常判定方法、異常判定装置、異常判定システム及び非一時的なコンピュータ可読媒体
JPWO2023157113A1 (https=) * 2022-02-16 2023-08-24
US12613127B2 (en) 2021-03-04 2026-04-28 Nec Corporation Engineering work optical detection device and method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114207389A (zh) * 2019-08-13 2022-03-18 日本电气株式会社 光纤传感系统、光纤传感设备和救援请求检测方法
WO2025062510A1 (ja) * 2023-09-20 2025-03-27 日本電信電話株式会社 漏水検知システム
WO2025062509A1 (ja) * 2023-09-20 2025-03-27 日本電信電話株式会社 漏水検知システム

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3903221B2 (ja) * 2005-06-24 2007-04-11 オプテックス株式会社 防犯センサ
JP3920742B2 (ja) * 2002-08-28 2007-05-30 トヨタ自動車株式会社 異常音の音源探査方法及び音源探査装置
US20120226452A1 (en) * 2009-11-13 2012-09-06 Optasense Holdings Limited Improvements in Distributed Fibre Optic Sensing
WO2013051196A1 (ja) * 2011-10-05 2013-04-11 ニューブレクス株式会社 分布型光ファイバ音波検出装置
JP5294925B2 (ja) * 2009-03-02 2013-09-18 株式会社熊谷組 音源の推定方法とその装置
JP5473888B2 (ja) * 2010-12-22 2014-04-16 三菱重工業株式会社 漏洩検出システム
US20180332389A1 (en) * 2016-06-03 2018-11-15 Faraday&Future Inc. Method and apparatus to detect and isolate audio in a vehicle using multiple microphones

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8121442B2 (en) * 2008-12-24 2012-02-21 At&T Intellectual Property I, L.P. Optical fiber surveillance topology
GB201109372D0 (en) * 2011-06-06 2011-07-20 Silixa Ltd Method for locating an acoustic source
GB201201727D0 (en) * 2012-02-01 2012-03-14 Qinetiq Ltd Indicating locations

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3920742B2 (ja) * 2002-08-28 2007-05-30 トヨタ自動車株式会社 異常音の音源探査方法及び音源探査装置
JP3903221B2 (ja) * 2005-06-24 2007-04-11 オプテックス株式会社 防犯センサ
JP5294925B2 (ja) * 2009-03-02 2013-09-18 株式会社熊谷組 音源の推定方法とその装置
US20120226452A1 (en) * 2009-11-13 2012-09-06 Optasense Holdings Limited Improvements in Distributed Fibre Optic Sensing
JP5473888B2 (ja) * 2010-12-22 2014-04-16 三菱重工業株式会社 漏洩検出システム
WO2013051196A1 (ja) * 2011-10-05 2013-04-11 ニューブレクス株式会社 分布型光ファイバ音波検出装置
US20180332389A1 (en) * 2016-06-03 2018-11-15 Faraday&Future Inc. Method and apparatus to detect and isolate audio in a vehicle using multiple microphones

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7574913B2 (ja) 2021-03-04 2024-10-29 日本電気株式会社 検出装置、検出システム及び検出方法
WO2022185469A1 (ja) * 2021-03-04 2022-09-09 日本電気株式会社 工事検出装置、工事検出システム及び工事検出方法
JPWO2022185469A1 (https=) * 2021-03-04 2022-09-09
US12613127B2 (en) 2021-03-04 2026-04-28 Nec Corporation Engineering work optical detection device and method
JP7491464B2 (ja) 2021-03-29 2024-05-28 日本電気株式会社 空間センシング装置、空間センシングシステム及び空間センシング方法
JPWO2022208594A1 (https=) * 2021-03-29 2022-10-06
WO2022208594A1 (ja) * 2021-03-29 2022-10-06 日本電気株式会社 空間センシング装置、空間センシングシステム及び空間センシング方法
US12553749B2 (en) 2021-03-29 2026-02-17 Nec Corporation Spatial sensing device, spatial sensing system, and spatial sensing method
CN113702908B (zh) * 2021-09-01 2023-06-09 哈尔滨工程大学 一种基于pdh解调技术的高精度三维声源定位系统
CN113702908A (zh) * 2021-09-01 2021-11-26 哈尔滨工程大学 一种基于pdh解调技术的高精度三维声源定位方案
WO2023073762A1 (ja) * 2021-10-25 2023-05-04 日本電気株式会社 監視システム、監視方法
JP7662045B2 (ja) 2021-10-25 2025-04-15 日本電気株式会社 監視システム、監視方法
JPWO2023073762A1 (https=) * 2021-10-25 2023-05-04
JP7647923B2 (ja) 2021-11-17 2025-03-18 日本電気株式会社 異常判定方法、異常判定装置、異常判定システム及び異常判定プログラム
JPWO2023089692A1 (https=) * 2021-11-17 2023-05-25
US12573275B2 (en) 2021-11-17 2026-03-10 Nec Corporation Abnormality determination method, abnormality determination apparatus, abnormality determination system, and non-transitory computer-readable medium
WO2023089692A1 (ja) * 2021-11-17 2023-05-25 日本電気株式会社 異常判定方法、異常判定装置、異常判定システム及び非一時的なコンピュータ可読媒体
WO2023157113A1 (ja) * 2022-02-16 2023-08-24 日本電気株式会社 処理装置、分布型音響センシングシステム、分布型音響センシング方法及びプログラムが格納された非一時的なコンピュータ可読媒体
JPWO2023157113A1 (https=) * 2022-02-16 2023-08-24

Also Published As

Publication number Publication date
JP7318706B2 (ja) 2023-08-01
JPWO2020255358A1 (https=) 2020-12-24
US20220357421A1 (en) 2022-11-10

Similar Documents

Publication Publication Date Title
WO2020255358A1 (ja) 光ファイバセンシングシステム及び音源位置特定方法
JP7276356B2 (ja) 光ファイバセンシングシステム、状態検知装置、状態検知方法、及びプログラム
US10182280B2 (en) Sound processing apparatus, sound processing system and sound processing method
US20150281832A1 (en) Sound processing apparatus, sound processing system and sound processing method
US12104946B2 (en) Optical fiber sensing system, action specifying apparatus, action specifying method, and computer readable medium
JP7464281B2 (ja) 光ファイバセンシングシステム、監視装置、監視方法、及びプログラム
JPWO2015162645A1 (ja) 音声処理方法、音声処理システム、及び記憶媒体
US20210400240A1 (en) Image processing apparatus, image processing method, and computer readable medium
US20220377091A1 (en) Indicators Of Compromise By Analyzing Data Based On Rolling Baseline
JP2019079369A (ja) 避難誘導システム
JP2023109757A (ja) 監視システム、監視装置、監視方法、及びプログラム
JP7338687B2 (ja) 光ファイバセンシングシステム、光ファイバセンシング機器、及び地中行動監視方法
WO2021024388A1 (ja) 光ファイバセンシングシステム、光ファイバセンシング機器、及び無人機配置方法
JPWO2015151130A1 (ja) 音声処理方法、音声処理システム、及び記憶媒体
JP7315011B2 (ja) 光ファイバセンシングシステム、監視方法、及びプログラム
JP2023033312A (ja) 光ファイバセンシングシステム、光ファイバセンシング装置及び光ファイバセンシング方法
WO2019187288A1 (ja) 情報処理装置、データ生成方法、及びプログラムが格納された非一時的なコンピュータ可読媒体
JP6570906B2 (ja) 監視システム及び監視方法
US20230070029A1 (en) Detection system, detection device, and detection method
EP2927885A1 (en) Sound processing apparatus, sound processing system and sound processing method
EP2938097B1 (en) Sound processing apparatus, sound processing system and sound processing method
JP7359216B2 (ja) 光ファイバセンシングシステム及び監視方法
JP2020136905A (ja) 作業監視システムおよび作業監視方法
WO2024201664A1 (ja) 監視システム、監視装置、及び監視方法
JPH01187478A (ja) 音の発生移動表示方法と音の発生移動監視装置並びにその収音部

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 19933697

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021528583

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 19933697

Country of ref document: EP

Kind code of ref document: A1