JP2019190951A - Mobile body scanner - Google Patents

Abstract

To provide a mobile body scanner which can inspect such a moving body as a walking person.SOLUTION: Using a terahertz wave TW allows acquisition of a scan image with an enough resolution even if the inspection target is a walking person PE, for example. Since the direction of propagation of a terahertz wave TW can be adjusted by a direction changing mirror 20 according to detection of the position of the walking person PE as a mobile body by a position detection unit 30, it becomes possible to secure the state in which the walking person PE is appropriately irradiated with a terahertz wave TW.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a moving body scanner that performs scanning in order to inspect the inside of a moving body as an inspection target.

  As a scanner for inspecting the inside of an inspection object, for example, a body scanner for performing a body check at an airport or the like is known (for example, see Patent Document 1).

  However, in the above-mentioned patent document 1, it is assumed that the inspection is performed while the target person is confined in the space and does not move, and for example, a large number of people such as station ticket gates and event venues are sequentially checked. For example, there is a request to realize a walk-through body scanner with a passage type.

JP 2015-36680 A

  The present invention has been made in view of the above points, and an object of the present invention is to provide a mobile scanner capable of using a moving object such as a pedestrian, that is, a mobile object as an inspection target.

  In order to achieve the above object, a mobile scanner according to the present invention transmits a terahertz wave having a predetermined wavelength band toward a mobile body to be inspected, receives a terahertz wave reflected from the mobile body, An inspection unit that scans, a position detection unit that detects the position of the moving body, and a direction switching mirror that switches a propagation direction of the terahertz wave from the inspection unit according to the position of the moving body detected by the position detection unit. .

  In the mobile scanner, by using the terahertz wave, it is possible to obtain a scan image with a resolution that is necessary even when the inspection target moves. At this time, in particular, since the position detection unit can detect the position of the moving body and adjust the propagation direction of the terahertz wave by the direction switching mirror accordingly, it is possible to ensure a state in which an appropriate terahertz wave is irradiated on the inspection target. . For example, for a pedestrian as a moving body, the direction switching mirror is switched in accordance with the movement of one pedestrian and scanned from a plurality of directions. In the case of coming sequentially, an appropriate body check can be performed by switching the direction of the direction switching mirror so that scanning can be performed simultaneously in parallel in the inspection unit.

  In a specific aspect of the present invention, the inspection unit scans the moving body from different directions by switching with the direction switching mirror. In this case, since the moving body to be inspected can be scanned from different angles, it can be applied to, for example, a body check performed from various directions with a person as the inspection object.

  In another aspect of the present invention, the direction switching mirror switches the direction so as to simultaneously scan a plurality of moving objects that are simultaneously present in the scanable range. In this case, it becomes possible to handle a plurality of moving objects.

  In still another aspect of the present invention, a plurality of position detection units are provided along the moving direction of the moving body. In this case, it is possible to perform scanning while detecting the position of the moving body based on the detection results of the position detection units provided at different positions.

  In still another aspect of the present invention, the direction switching mirror is fixed in a posture determined for each moving body detection in the plurality of position detection units. In this case, the moving body can be scanned from different directions for each defined position.

  In still another aspect of the present invention, the body scanner includes a pedestrian as a moving object to be inspected, the inspection unit scans a part of the human body, and the position detection unit detects a pedestrian. It is. In this case, it is possible to perform a body scan with a pedestrian as an inspection target, that is, a body scan without stopping a person.

  In yet another aspect of the present invention, an image creation unit is provided that creates image data for each switching by the direction switching mirror based on the scan result of the moving body by the inspection unit. In this case, an image based on data obtained by scanning the moving body from a plurality of directions is created.

  According to still another aspect of the present invention, a path body that defines a moving direction of the moving body is formed, and a position detection unit is disposed along the path. The direction switching mirror is provided on a side of the path. The terahertz wave is irradiated toward the moving body that moves along the passage. In this case, for example, the scanning can be reliably performed by passing the moving body in the passage defined by the passage housing constituting the ticket gate of the station.

FIG. 3 is a plan view conceptually showing a configuration example of a mobile scanner according to the first embodiment. It is a conceptual diagram for demonstrating an example about a direction switching mirror. It is a key map for explaining an example about an inspection part. (A) And (B) is a conceptual top view for demonstrating a mode that the pedestrian which is a moving body is scanned from one direction. It is a top view which shows notionally about a mode that a pedestrian is scanned from a 1st direction. It is a top view which shows notionally about a mode that a pedestrian is scanned from a 2nd direction. It is a top view which shows notionally about a mode that a pedestrian is scanned from a 3rd direction. It is a top view which shows notionally an example of operation | movement of the mobile scanner of 2nd Embodiment. It is a flowchart which shows an example of the various processes of a mobile scanner.

[First Embodiment]
Hereinafter, an outline of an example of the mobile scanner according to the first embodiment will be described with reference to the drawings.

  The mobile scanner 100 according to one aspect of the present embodiment includes an inspection unit 10 that transmits a terahertz wave as a measurement wave, a direction switching mirror 20 that switches a propagation direction of the terahertz wave from the inspection unit 10, and movement as an inspection target. A position detection unit 30 that detects the position of the body, a control unit 50 that controls the operation of each unit, and an image creation unit 60 that creates an image based on information about the scan result from the control unit 50 are provided. Here, as an example, it is assumed that the mobile scanner 100 is a body scanner that uses a pedestrian PE passing through a specific passage such as a ticket gate of a station as a mobile object to be inspected. Furthermore, in an example here, more specifically, at least a part of each of the above-described parts constituting the mobile scanner 100 is provided in a passage housing CA constituted by a ticket gate provided at a ticket gate of a station. It shall be. In other words, the aisle casing CA, which is a ticket gate, etc., defines the moving direction (traveling direction) of the pedestrian PE by forming the passage PT of the pedestrian (moving body) PE to be inspected, and detects the position. Each part such as the part 30 is installed. Correspondingly, the mobile scanner 100 can scan in the passage PT. In other words, the mobile scanner 100 scans the target range from the entrance to the exit of the passage PT. In the above, the ticket gate mentioned as the passage housing CA is an example, and in addition to this, the passage housing CA in which the direction switching mirror 20 and the like can be installed in various places such as an entrance gate of an event venue and a passageway. can do.

  Here, as shown in the figure, the traveling direction of the pedestrian PE to be inspected indicated by the arrow D1 is the + Z direction, and in the plane perpendicular to the Z direction, the vertical direction, that is, the vertical direction is the Y direction, and the Z direction and The horizontal direction, which is a direction orthogonal to both of the Y directions, is taken as the X direction.

  Hereinafter, each unit constituting the mobile scanner 100 will be described. First, in the mobile scanner 100, the inspection unit 10 transmits a terahertz wave TW of a predetermined wavelength band to a pedestrian PE that is a mobile object to be inspected, and the terahertz wave TW reflected from the pedestrian PE. The reflection component RW is received and the pedestrian PE is scanned. That is, the inspection unit 10 scans a part of the human body. In the example shown in the figure, the inspection unit 10 is installed on the + X side of the passage casing CA arranged in a pair in the X direction to form the passage PT, and the terahertz wave TW toward the −X side, that is, the passage PT side. Is outgoing. An example of the internal structure of the inspection unit 10 will be described later with reference to FIG.

  As shown in the figure, the direction switching mirror 20 is provided on the side of the passage PT so as to face the transmission side (−X side) of the inspection unit 10, and transmits the terahertz wave TW from the inspection unit 10 to the passage PT side. The direction of reflection is adjusted, and the terahertz wave TW is irradiated toward the pedestrian PE moving in the Z direction along the passage PT. Conversely, the reflection component RW of the terahertz wave TW reflected by the pedestrian PE is irradiated toward the inspection unit 10.

  In the illustrated example, the inspection unit 10 and the direction switching mirror 20 are arranged on the + X side (left side in the traveling direction for the pedestrian) of the side of the passage PT. Not limited to.

  In addition, as illustrated in FIG. 2, the direction switching mirror 20 is a plate-like member extending in the Y direction, that is, the vertical direction, and is driven by the rotation driving unit 21 to rotate the central axis AX extending in the Y direction as the rotation axis. As can be rotated. In the mobile scanner 100 shown in FIG. 1 and the like, the direction switching mirror 20 rotates around the Y axis in accordance with the control of the control unit 50, whereby the propagation direction of the terahertz wave TW from the inspection unit 10 is switched and is the inspection target. The pedestrian PE can be scanned from a plurality of directions.

  Returning to FIG. 1, the position detection unit 30 includes a human sensor that detects a pedestrian PE. In the illustrated example, a plurality of human sensors are arranged to form the position detection unit 30 along a path PT that forms the moving direction of the moving body, that is, the traveling direction of the pedestrian PE. Although various sensors can be used as human sensors, here, as an example, a set of infrared light sensors 30A and 30B that transmit and receive infrared light, and a direction in which the infrared light IL crosses the path PT. It is installed so as to be ejected (typically in the X direction). That is, when the pedestrian PE passes, the infrared light sensors 30A and 30B detect that the infrared light IL is blocked (shielded), thereby detecting the position of the moving pedestrian PE. In the illustrated example, two sets of infrared light sensors 30A are to be detected at two locations, the first sensor portion 31 provided on the entrance side of the passage PT and the second sensor portion 32 provided on the exit side. , 30B. However, the position detection unit 30 is not limited to this example, and the position detection unit 30 may perform more detailed position detection, for example, by arranging more sensors along the path PT.

  The control unit 50 is composed of, for example, various control circuits, and is connected to each unit constituting the mobile scanner 100 as described above. The control unit 50 supervises these operation controls and also obtains the inspection acquired in the scan by the inspection unit 10. The result data is transmitted to the image creation unit 60.

  The image creation unit 60 includes, for example, a PC having a display monitor and the like and a CPU and a GPU for enabling various information processing. Various image processing is performed on the scan result transmitted from the control unit 50. Etc., and the analysis result of the data acquired by scanning on the display monitor is visualized and shown.

  Hereinafter, a configuration example of the above-described inspection unit 10 will be described in detail with reference to FIG. The inspection unit 10 illustrated in the figure includes a transmission unit Tx that transmits a terahertz wave TW, a reception unit Rx that receives a reflection component RW reflected by an inspection target, a half mirror, and the like, and transmits and transmits the terahertz wave TW. It includes a beam splitter BS that performs reflection, a galvano mirror GM as a scanning mirror, and a lens LS that transmits scanning light from the galvano mirror GM to the outside of the apparatus. The terahertz wave TW is transmitted while being condensed from the lens LS toward the pedestrian PE to be inspected.

  Among these, first, the transmitting unit Tx is an electromagnetic wave transmitting device that transmits a terahertz wave TW having a predetermined wavelength band, for example, a wavelength band having a frequency of 0.1 to 2 THz, that is, a wavelength band of 150 to 3000 μm. The direction of the terahertz wave TW is the center of the traveling direction as the optical axis in the inspection unit 10.

  The receiving unit Rx is an electromagnetic wave receiving device or an electromagnetic wave measuring device that can receive a component in the wavelength band of the terahertz wave TW. The receiving unit Rx receives the reflection component RW reflected from the detection target (in each example, the pedestrian PE) in the terahertz wave TW. In the drawing, one receiving unit Rx is used, but the receiving side may be configured by a plurality of receiving units, or may be configured by including a plurality of light receiving elements in one receiving unit Rx. is there. By using a plurality, it is possible to more accurately grasp the change state of the reflection component RW.

  In addition, the beam splitter BS is formed of, for example, a half mirror, and is arranged so that a transmission / reflection surface formed by the half mirror is inclined by 45 ° with respect to the optical axis of the transmission unit Tx. The receiving unit Rx is disposed at a position symmetrical to the transmitting unit Tx with respect to the beam splitter BS, and the component of the reflected component RW is acquired by receiving the component of the return light reflected by the beam splitter BS. .

  The galvanometer mirror GM is disposed on the optical axis at a certain distance from the transmitter Tx, and rotates (swings) about one axis around an axis orthogonal to the optical axis, for example. That is, scanning in the uniaxial direction of the terahertz wave TW is performed. The scanning direction can be variously set depending on the arrangement of the optical system, but here, scanning is performed in the vertical direction, that is, the Y direction perpendicular to the traveling direction (Z direction) shown in FIG. That is, scanning is performed along the direction switching mirror 20 with the Y direction shown in FIG. 2 as the longitudinal direction.

  The lens LS is arranged toward the outside of the apparatus, that is, toward the reflection surface of the direction switching mirror 20 so as to emit the scanning light from the galvanometer mirror GM.

  As described above, the mobile scanner 100 according to the present embodiment has a line scan type configuration in which the inspection unit 10 irradiates the terahertz wave TW with the direction switching mirror 20 while performing primary scanning in the Y direction. ing.

  Here, regarding scanning to the human body etc. using a scanner, when using it in places such as station ticket gates and event venues, especially when you want to sequentially check the body of a large number of people, It is considered unsuitable to perform the inspection while the target person is confined and the person does not move, and a walk-through type body scanner is desired. In this case, in order to realize a walk-through type body scanner, for example, it may be necessary to inspect the front and back of the body from an oblique direction. It is also considered necessary to be able to analyze an inspection object that moves while maintaining a resolution sufficient for inspection. On the other hand, in the mobile scanner 100 of the present embodiment, as described above, even if the inspection target moves like a pedestrian by using a component in the wavelength band of the terahertz wave TW, Image data is acquired while maintaining sufficient resolution, and the pedestrian PE to be inspected is checked from various directions by irradiating the terahertz wave TW from different directions according to movement by the direction switching mirror 20 or the like. Making it possible.

  Hereinafter, referring back to FIG. 1, an outline of a series of operations performed by each unit constituting the mobile scanner 100 will be described. First, as shown in the figure, when the pedestrian PE is detected by the infrared light IL being shielded by the first sensor unit 31 provided on the entrance side of the passage PT, the first sensor unit 31 notifies that fact. Notify the controller 50. The control unit 50 that has received the notification operates the inspection unit 10 and the direction switching mirror 20 to irradiate the terahertz wave TW toward the first sensor unit 31 where the pedestrian PE exists. That is, the control unit 50 rotates the direction switching mirror 20 around the Y axis, and after setting the reflecting surface of the direction switching mirror 20 to be slightly inclined so as to face the entrance side of the passage PT, By transmitting the terahertz wave TW from the inspection unit 10, the propagation direction of the terahertz wave TW from the inspection unit 10 becomes the direction of the pedestrian PE in the vicinity of the first sensor unit 31 (first direction DR 1). Switch to.

  Here, while the pedestrian PE is detected in the first sensor unit 31, the direction switching mirror 20 is fixed in a predetermined posture, that is, the first direction DR1 does not change. It has become. On the other hand, the pedestrian PE continues to move in the traveling direction (+ Z direction) indicated by the arrow D1. As a result, each part of the pedestrian PE is scanned.

  The above will be described in more detail with reference to FIG. 4. First, as illustrated in FIG. 4A, at the stage where the pedestrian PE starts to be detected in the first sensor unit 31, the terahertz wave TW is Of the front surface of the pedestrian PE, the light is reflected from the direction switching mirror 20 on the far side (−X side) in the X direction. That is, the reflection position RP of the terahertz wave TW is relatively on the −X side.

  On the other hand, when the pedestrian PE proceeds in the traveling direction (+ Z direction) indicated by the arrow D1, the reflection position RP of the terahertz wave TW gradually changes its direction as it progresses as shown in FIG. It shifts to the side relatively close to the mirror 20 (+ X side). Therefore, while the pedestrian PE is detected by the first sensor unit 31, by continuing detection with the direction switching mirror 20 fixed in a predetermined posture, a scanned image of the pedestrian PE can be obtained. . In this case, the scan of the front side of the pedestrian PE is mainly performed. At this time, for example, the focus position may be adjusted in the inspection unit 10 as necessary.

  Hereinafter, with reference to FIGS. 5 to 7, the details of the scanning operation by the mobile scanner 100 performed when the pedestrian PE passes from the entrance to the exit of the passage PT will be described. In this example, three sets of infrared light sensors 30A and 30B are used as the position detection unit 30 in order to detect positions along the passage PT at three locations on the entrance side, near the center, and on the exit side of the passage PT. It shall be provided. That is, the position detection unit 30 includes first to third sensor units 31 to 33 configured by infrared light sensors 30A and 30B, respectively, and these are connected to the control unit 50 and controlled in operation. And

  FIG. 5 is a plan view conceptually showing a state in which the pedestrian PE is scanned from the first direction DR1 by the mobile scanner 100 of the above aspect, and an example of an aspect in which the front surface of the pedestrian PE is inspected. Show. More specifically, FIG. 5 shows the infrared in the first sensor unit 31 arranged on the most -Z side in the traveling direction, that is, on the entrance side of the passage PT among the first to third sensor units 31 to 33. The mode of operation when pedestrian PE is detected based on interception detection of light IL1 is shown. In this case, the first direction DR1 is a direction having a component on the −Z side with respect to the lateral direction (−X direction).

  In this case, as described above, the control unit 50 rotates the direction switching mirror 20 around the Y axis so that the reflecting surface of the direction switching mirror 20 faces the entrance side of the passage PT slightly. The terahertz wave TW is transmitted from the inspection unit 10 after being placed in a state where the inspection unit 10 is tilted toward the inspection unit 10, that is, in a state of being fixed in a predetermined posture. Thereby, the terahertz wave TW is irradiated in the first direction DR1, and the front side of the pedestrian PE is scanned with the movement of the pedestrian PE. In this case, for example, as shown in the figure, when the pedestrian PE has a knife KN or the like on the chest, the image creation unit 60 analyzes the inspection result regarding the detection of the reflection component RW in the inspection unit 10. By doing so, for example, the display unit DS of the image creation unit 60 can display the analyzed image together with the display indicating that there is a foreign object on the front surface of the pedestrian PE. In addition, as a process regarding said scanning result, the situation of the front part of pedestrian PE is imaged, for example by integrating the result which scanned the front side of pedestrian PE regarding time, ie, the movement distance of pedestrian PE. can do. Further, by determining the presence or absence of a foreign substance from the imaged data, the above-described visualization becomes possible.

  FIG. 6 is a plan view conceptually showing how the pedestrian PE is scanned from the second direction DR2 by the mobile scanner 100 of the above aspect, and an example of an aspect in which the side surface of the pedestrian PE is inspected. Show. More specifically, FIG. 6 shows the infrared light IL2 in the second sensor unit 32 disposed in the middle position in the traveling direction among the first to third sensor units 31 to 33, that is, near the center of the passage PT. The mode of operation when pedestrian PE is detected based on the interception detection of is shown. In this case, the second direction DR2 is a direction having a component in a substantially reference direction with the lateral direction (−X direction) as a reference.

  In this case, the control unit 50 rotates the direction switching mirror 20 around the Y axis, and arranges the direction switching mirror 20 so as not to reflect the terahertz wave TW from the inspection unit 10 on the reflection surface with the direction switching mirror 20 being directly or substantially directly beside. The terahertz wave TW is transmitted from the inspection unit 10 after being set in a state, that is, in a state where it is fixed in a predetermined posture. Thereby, the terahertz wave TW is irradiated in the second direction DR2, and the side of the pedestrian PE (in the illustrated case, the left side of the pedestrian PE) is scanned along with the movement of the pedestrian PE. In this case, for example, when the pedestrian PE does not have anything on the side, the display unit DS of the image creation unit 60 is obtained as a result of image analysis of the scan result in the inspection unit 10 in the image creation unit 60. The side of the pedestrian PE indicates that there is no foreign object and the inspection has been completed safely, and the analyzed image is not particularly displayed.

  FIG. 7 is a plan view conceptually showing how the pedestrian PE is scanned from the third direction DR3 by the mobile scanner 100 of the above aspect, and an example of an aspect in which the back surface of the pedestrian PE is inspected. Show. More specifically, FIG. 7 shows infrared light in the third sensor unit 33 arranged on the most + Z side in the traveling direction among the first to third sensor units 31 to 33, that is, the exit side of the passage PT. The mode of operation when pedestrian PE is detected based on interception detection of IL3 is shown. In this case, the third direction DR3 is a direction having a component on the + Z side with respect to the lateral direction (−X direction).

  In this case, the control unit 50 rotates the direction switching mirror 20 around the Y axis so that the reflecting surface of the direction switching mirror 20 is slightly tilted to the inspection unit 10 side from a state of being directly opposite to the exit side of the passage PT. Then, the terahertz wave TW is transmitted from the inspection unit 10 in a state in which the inspection unit 10 is fixed in a predetermined posture. Thereby, the terahertz wave TW is irradiated in the third direction DR3, and the back side of the pedestrian PE is scanned with the movement of the pedestrian PE. In this case, for example, when the pedestrian PE does not have anything behind, the display unit DS of the image creation unit 60 is obtained as a result of image analysis of the scan result in the inspection unit 10 in the image creation unit 60. The side of the pedestrian PE indicates that there is no foreign object and the inspection has been completed safely, and the analyzed image is not particularly displayed.

  In the above-described example described above, the directions of the first to third directions DR1 to DR3 that are three different propagation directions according to the first to third sensor units 31 to 33 arranged at three different positions, respectively. By switching the posture of the switching mirror 20, it is possible to scan the front, side and back of the pedestrian PE.

  As described above, the mobile scanner 100 according to the present embodiment uses the terahertz wave TW to scan with a resolution that is necessary even when the inspection target moves, such as a pedestrian PE. Images can be acquired. At this time, in particular, the position detection unit 30 can detect the position of the pedestrian PE that is a moving body and adjust the propagation direction of the terahertz wave TW by the direction switching mirror 20 accordingly. The irradiation state of the wave TW can be ensured. In the case of this embodiment, for example, according to the movement of the pedestrian PE, that is, a change in position, the direction of the direction switching mirror 20 can be switched to scan from a plurality of directions.

  Further, in the above case, the position of the pedestrian PE to be inspected is detected using the position detection unit 30 including a human sensor, and the terahertz is detected only in the direction where the pedestrian PE detected by the direction switching mirror 20 is present. The configuration is such that the wave TW is radiated. In other words, by using the position detection unit 30 and the direction switching mirror 20, one inspection unit 10 realizes detection in two or more directions. Thereby, the number of inspection units 10 can be reduced and the cost can be reduced. In general, a set of a transmitting device that transmits a terahertz wave and a receiving sensor that receives a terahertz wave is expensive. For example, if two sets of the transmitting device and the receiving sensor are used in order to look in two directions, the price is low. Can be expensive.

[Second Embodiment]
The outline of an example of the mobile scanner according to the second embodiment of the present invention will be described below with reference to FIG. Note that the mobile scanner 200 according to the present embodiment is a modification of the mobile scanner 100 of the first embodiment, and performs processing corresponding to a case where a plurality of pedestrians PE are simultaneously present in a scanable range. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  Also in the mobile scanner 200 of the present embodiment, as in the case of the mobile scanner 100 of the first embodiment, the pedestrian PE is moved, that is, the direction of the direction switching mirror 20 is switched in accordance with the change in position. Scan is performed from the direction of.

  Here, the first embodiment has been described as a scan for a pedestrian as a single moving body, but more generally, depending on the installation environment of the mobile body scanner, there are a plurality of mobile bodies in the scannable range at the same time. There is a possibility. The mobile scanner 200 as one aspect of the present embodiment is an example having a processing function assuming such a case. For this reason, the mobile scanner 200 according to the present embodiment is a periodic scan for causing the direction switching mirror 20 to perform an operation of periodically and alternately scanning a plurality of mobile bodies in the control unit 250 that performs overall control of each unit. A control unit 250A is further provided. That is, the periodic scan control unit 250A switches the direction of the direction switching mirror 20 so that a plurality of moving bodies that are simultaneously present in the path PT are simultaneously scanned.

  Further, here, as shown as an example in FIG. 8, it is assumed that two pedestrians PE exist simultaneously in the passage PT that is a range that can be scanned by the mobile scanner 200. More specifically, it is assumed that the second pedestrian PE2 has newly entered the passage PT when the first pedestrian PE1 approaches the exit of the passage PT. That is, the pedestrian PE1 is detected based on the detection of the blocking of the infrared light IL3 in the third sensor unit 33, and the pedestrian PE2 is detected based on the detection of the blocking of the infrared light IL1 in the first sensor unit 31. By being notified to the control unit 250, the control unit 250 recognizes that two pedestrians PE1 and PE2 exist at the same time. In this case, the periodic scan control unit 250A of the control unit 250 has the direction so that the terahertz wave TW is directed to the third direction DR3 and the first direction DR1 at a predetermined fixed period and the both are scanned. The switching operation of the switching mirror 20 is performed. That is, in the above case, the mobile scanner 200 can perform simultaneous detection in two directions by alternately scanning with the direction switching mirror 20 at a constant period. Note that the interval of the fixed period is appropriately determined according to the scanning performance of the mobile scanner 200, the walking speed assumed for the pedestrian PE, and the like.

  Hereinafter, an example of various processes of the mobile scanner 200 will be described with reference to the flowchart of FIG. When the moving body scanner 200 is activated, the control unit 250 first confirms whether or not the pedestrian PE as a moving body is detected in the position detection unit 30 configured by a human sensor or the like. More specifically, here, for example, whether or not detection is performed by the sensor units 31 and 33 which are human sensors on both the entrance side and the exit side, at a plurality of locations (two locations or more). The presence or absence of detection is performed (step S101). That is, as in the case of FIG. 8, it is detected whether or not two pedestrians PE1 and PE2 exist at the same time.

  In step S101, when it is determined that a plurality of locations are not detected (step S101: no), the control unit 250 further performs presence / absence detection at a single location (one location) in the position detection unit 30 (step S101). S102). That is, whether or not there is even one pedestrian PE is detected. In step S102, when it is confirmed that there is a target, that is, one pedestrian PE exists in the passage PT that is within the detection range (step S102: yes), the control unit 250 performs the detection on the detected target. Start scan operation. That is, as various operations in the case described in the first embodiment, first, the direction switching mirror 20 is switched to direct the terahertz wave TW in the direction in which the pedestrian PE exists, and the posture of the direction switching mirror 20 is changed in that direction. It is fixed (step S103), the line scan measurement using the terahertz wave TW by the inspection unit 10 is performed (step S104), and the pedestrian PE is detected at one place in step S102 (step S101: no, and Step S102: yes), the above operation is repeated.

  On the other hand, if it is determined in step S101 that detection has been made at a plurality of locations (step S101: yes), the control unit 250 cycles the direction switching mirror 20 at a constant cycle by the control of the periodic scan control unit 250A as described above. While performing the scanning operation (step S105), the inspection unit 10 performs line scan measurement using the terahertz wave TW (step S104), and while the pedestrian PE is detected at a plurality of locations in step S101 (step S101). : Yes), the above operation is repeated. That is, in this case, detection is performed in parallel for pedestrians PE detected at two or more locations.

  If it is determined in step S102 that no pedestrian PE has been detected (step S101: no), the control unit 250 determines that there is no pedestrian PE in the passage PT, and a series of operations. Exit. Also in this case, for example, while the driving power source of the mobile scanner 200 is on, the series of operations from step S101 may be repeated again.

  As described above, also in the present embodiment, by using the terahertz wave TW in the mobile scanner 200, it is possible to acquire a scan image with a resolution sufficient for a moving inspection target such as a pedestrian PE, An appropriate irradiation state of the terahertz wave TW to the pedestrian PE can be ensured. Further, in the case of the present embodiment, for example, by switching the direction of the direction switching mirror 20 so that the inspection unit 10 can perform scanning in parallel, it becomes possible to cope with a plurality of pedestrians PE that are moving bodies. Appropriate checks can be made on the subject of

[Others]
The present invention is not limited to the above embodiment, and can be implemented in various modes without departing from the scope of the invention.

  First, in the above-described embodiment, an infrared light sensor is used as a human sensor constituting the position detection unit 30. However, the present invention is not limited to this, and various human sensors such as a thermal sensor may be adopted. In the above example, two or three sets of infrared light sensors are arranged along the path PT, and the infrared light IL is emitted in the X direction. About a range etc., it can be set as not only these but various number methods and aspects. Further, for example, regarding the position detection of the pedestrian PE, for example, the detection start position of the pedestrian PE, that is, the measurement start position by the terahertz wave, and the detection end position of the pedestrian PE, that is, the measurement end position by the terahertz wave can be specified. The position detection unit 30 may perform detection with a width in the traveling direction of the pedestrian PE.

  Also, the size and the like of the direction switching mirror 20 can be variously changed. For example, when installed in a ticket gate or the like as in the above example, the size of the upper body of the pedestrian PE passing through can be measured. A mode of setting the height in the Y direction is conceivable. Moreover, about the direction switching mirror 20, it is good also considering the reflective surface in a plate-shaped part as single side | surface or both surfaces.

  Further, in the above-described embodiment, from the viewpoint of cost, the measurement using the terahertz wave is performed by one inspection unit 10, but the measurement may be performed by two or more inspection units 10. For example, in the example of FIG. 1 and the like, the inspection unit 10 and the direction switching mirror 20 are installed not only on the left side (+ X side) in the traveling direction but also on the right side (−X side) in the left and right passage chassis CA. May be equal. Or you may measure by changing an installation position and an angle from the same direction. As a result, highly accurate measurement with fewer blind spots is possible.

  In the above description, the moving body is a pedestrian, but the present invention may be applied to a moving body other than the pedestrian.

  In the above embodiment, the wavelength band of the terahertz wave TW is assumed to be a band having a frequency of 0.1 to 2 THz. However, the present invention is not limited to this, and the present application is applied to those including various terahertz wavelength bands. be able to.

  Further, in the above-described embodiment, the configuration inside the inspection unit 10 may be other than the configuration illustrated in FIG. 3, and in the example illustrated in FIG. However, the present invention is not limited to this, and it is possible to apply a device that drives a light reflecting surface of various drive methods such as an electromagnetic drive method, an electrostatic method, a piezoelectric method, and a heat method. it can.

  DESCRIPTION OF SYMBOLS 10 ... Inspection | inspection part, 20 ... Direction switching mirror, 30 ... Position detection part, 30A, 30B ... Infrared light sensor, 31-33 ... Sensor part, 50 ... Control part, 60 ... Image preparation part, 100 ... Moving body scanner, DESCRIPTION OF SYMBOLS 200 ... Mobile body scanner, 250 ... Control part, 250A ... Periodic scan control part, AX ... Center axis, BS ... Beam splitter, CA ... Passage housing, D1 ... Arrow, DR1-DR3 ... Direction, DS ... Display part, GM ... Galvano mirror, IL, IL1-IL3 ... Infrared light, KN ... Knife, LS ... Lens, PE, PE1, PE2 ... Pedestrian (moving body), PT ... Passage, RP ... Reflection position, RW ... Reflection component, Rx ... Receiving unit, TW ... terahertz wave, Tx ... transmitting unit

Claims (8)

An inspection unit that transmits a terahertz wave of a predetermined wavelength band toward a moving object to be inspected, receives the terahertz wave reflected from the moving object, and scans the moving object;
A position detector for detecting the position of the moving object;
A moving body scanner comprising: a direction switching mirror that switches a propagation direction of the terahertz wave from the inspection section according to the position of the moving body detected by the position detection section.   The moving body scanner according to claim 1, wherein the inspection unit scans the moving body from different directions by switching with the direction switching mirror.   The moving body scanner according to any one of claims 1 and 2, wherein the direction switching mirror switches the direction so that a plurality of moving bodies simultaneously existing in a scanable range are scanned in parallel.   The moving body scanner according to claim 1, wherein a plurality of the position detection units are provided along a moving direction of the moving body.   The moving body scanner according to claim 4, wherein the direction switching mirror is fixed in a posture determined for each moving body detection in the plurality of position detection units. It is a body scanner that uses a pedestrian as a moving object for inspection.
The inspection unit scans a part of the human body,
The mobile scanner according to claim 1, wherein the position detection unit is a human sensor that detects a pedestrian.   The mobile scanner according to claim 1, further comprising an image creation unit that creates image data for each switching by the direction switching mirror based on a scan result of the mobile by the inspection unit. Forming a passage that defines a moving direction of the moving body, and including a passage housing that arranges the position detection unit along the passage;
The moving body scanner according to any one of claims 1 to 7, wherein the direction switching mirror is provided on a side of the passage and irradiates a terahertz wave toward a moving body that moves along the passage.

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