JP2012043130A - Explosive substance detection unit and gate device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an explosive substance detection unit with enhanced accuracy of determining whether a person carries an explosive substance or not.SOLUTION: A sampling part 3 takes a sample of the air around an operation part on which a user performs operations of inputting his/her ID. A density detection part 4 detects the density of an explosive substance included in the air which is sampled by the sampling part 3 while the user is inputting his/her ID. As for a user regarding whom the density detection part 4 detects the explosive substance density is above a first threshold value X, a control part 2 determines that the user carries the explosive substance. As for a user regarding whom the density detection part 4 detects the explosive substance density is below a second threshold value Y, which is lower than the first threshold value X, the control part 2 determines that the user does not carry the explosive substance. As for a user regarding whom the density detection part 4 detects the explosive substance density is between the first threshold value X and the second threshold value Y, the control part 2 determines that it is necessary to make a re-determination regarding him/her and requires the user to perform operations of re-inputting his/her ID.

Description

  The present invention relates to an explosive detection unit that detects whether a user possesses an explosive or not, and a gate device to which the explosive detection unit is applied in order to take measures against terrorism or the like.

  Conventionally, in locations where an unspecified number of people gather, such as stations, airports, amusement facilities, etc., as a measure against terrorist acts, discovering persons carrying explosives at ticket gates and entrances, etc., to prevent terrorist acts Is being considered. For example, an automatic ticket gate (gate device) that can detect whether or not an explosive is possessed has been proposed (see Non-Patent Document 1). Specifically, when a user who passes through the ticket gate passage traps a non-contact IC card in the wireless communication area, the surrounding air including the wireless communication area is collected. The concentration of explosive substances (explosives) contained in the collected air is detected. For example, the concentration of explosives such as trinitrotoluene, black powder, TATP, ammonium nitrate is detected. Then, based on the detected concentration, it is determined whether or not the user possesses explosives.

http://www.mext.go.jp/b_menu/shingi/gijyutu/gijyutu2/016/shiryo/attach/__icsFiles/afieldfile/2009/08/27/1283368_2.pdf [Science and Technology Council Research Plan / Evaluation Subcommittee Safety and Security Science and Technology Committee (21st), Document 3, pages 1 and 2]

  However, the determination regarding whether the explosive is possessed or not is determined based on whether the detected explosive concentration exceeds or does not exceed a predetermined threshold.

  On the other hand, even if the amount of explosive adhering to the user's hand and clothes (especially cuffs) is the same, a sampling port that collects air around the area including the wireless communication area, depending on how the non-contact IC card is worn The relative positional relationship between the user's hand and clothes changes. With the change in the relative positional relationship, the concentration of explosives contained in the collected air changes. For this reason, even users who have explosives have explosives detected at a lower concentration compared to the amount of explosives on their hands and clothing. Otherwise it may be misjudged.

  Even users who do not have explosives may have a very small amount of explosives attached. For example, visitors to fireworks festivals and people working at chemical factories are likely to have a small amount of explosives. In devices that are continuously used by many users, such as automatic ticket gates, even if each user has a very small amount, if explosives are dropped into the wireless communication area, the explosives are transferred to the wireless communication area. It accumulates inside and accumulates. As a result, the concentration of the explosive detected for a certain user may increase due to the explosive accumulated in the wireless communication area, and it may be erroneously determined that the explosive is possessed.

  Thus, in the conventional configuration, the accuracy of determining whether or not an explosive is possessed cannot be ensured sufficiently. In addition, this misjudgment does not allow users carrying explosives to pass through to prevent terrorist acts, or conversely wastes the traffic of users who do not carry explosives. There is a problem that the service for the user is reduced.

  An object of the present invention is to provide an explosive detection unit that improves the accuracy of determining whether a user has an explosive, and a gate device to which the explosive detection unit is applied.

  The explosive detection unit of the present invention is configured as follows in order to solve the above-described problems and achieve the object.

  The collection unit collects air around the operation unit on which the user performs an input operation. The operation unit may be configured to input an ID or the like by a key operation, or may be configured to read card information from a medium such as a card in which the ID or the like is recorded as card information. Examples of this type of medium include a non-contact IC card having a wireless communication function and storing card information in a memory, a magnetic card having card information recorded in a magnetic stripe, and a card having card information printed with a barcode.

  The concentration detection unit detects the concentration of the explosive substance contained in the air collected by the collection unit when the user performs an input operation using the operation unit. The concentration detection unit detects a concentration according to the amount of explosive material adhering to the hand or clothes (particularly cuffs) of the user who is performing an input operation on the operation unit. The concentration detection unit detects the concentration of explosives such as trinitrotoluene, black powder, TATP, ammonium nitrate as explosive substances.

  The determination unit determines that, for a user whose concentration of the explosive substance detected by the concentration detection unit exceeds the first threshold, the user possesses the explosive material. For a user whose concentration of the explosive substance detected by the concentration detection unit has not reached the second threshold value lower than the first threshold value, it is determined that the user does not possess the explosive substance. Furthermore, the determination unit determines that a user whose concentration of the explosive substance detected by the concentration detection unit is between the first threshold value and the second threshold value is a user that needs to be determined again. In this way, the determination unit determines that a user who is ambiguous in determining whether he / she has an explosive substance is a user who needs re-determination.

  The first threshold is a level at which it is possible to determine that there is a high possibility of possessing an explosive substance when this level is exceeded. The second threshold is a level at which it is possible to determine that there is a high possibility that the explosive substance is not possessed unless this level is reached. Between the first threshold value and the second threshold value, it is a level that cannot be generally determined as to whether or not an explosive is possessed. That is, between the first threshold value and the second threshold value, for some reason, it is a user whose explosive substance concentration is detected low, or conversely, a user whose explosive substance concentration is detected high. It is a gray zone that cannot be judged whether there is.

  The output unit provides a request for re-input operation at the operation unit to a user that the determination unit needs to re-determine, that is, a user whose detected explosive substance concentration is in the above-described gray zone. This output is performed. At this time, the output unit only requests a re-input operation at the operation unit, and does not notify the user of the re-detection of the concentration of the adhering explosive substance. Thus, the user is unaware that he / she is redetermined regarding possession of explosive material.

  Further, when the determination unit determines that re-determination is necessary for the user, the air around the operation unit may be convected to remove the explosive material remaining around the operation unit. Thereby, the density | concentration detection part can detect appropriately the density | concentration of the explosive substance adhering to the user who performs re-input operation.

  Further, for a user who has performed an output related to a request for a re-input operation by the output unit, the determination unit sets the first threshold value to a value lower than the first threshold value (however, the second threshold value). It is possible to determine whether or not the user has an explosive substance.

  This explosive detection unit can be applied to various devices such as automatic ticket gates at stations and airports, entrance / exit management devices for office buildings, entrance gates for amusement facilities, etc. It is possible to prevent terrorist acts and to prevent a decrease in service to users.

  According to the present invention, it is possible to improve the accuracy of determining whether or not a user possesses an explosive substance, and to enhance the preventive power against terrorism and improve the service to the user.

It is a block diagram which shows the structure of the principal part of an explosives detection unit. It is a figure explaining the relationship between the density | concentration of the detected explosive, and the determination result of whether it has an explosive. It is a flowchart which shows operation | movement of an explosives detection unit. It is a block diagram which shows the structure of the principal part of an automatic ticket gate. It is the schematic which shows the external appearance of an automatic ticket gate. It is a flowchart which shows operation | movement of an automatic ticket gate.

  Embodiments of the present invention will be described below.

  First, an embodiment of an explosive detection unit according to the present invention will be described. FIG. 1 is a block diagram showing the configuration of the main part of the explosive detection unit. The explosive detection unit 1 includes a control unit 2, a sampling unit 3, a concentration detection unit 4, a convection unit 5, and an input / output unit 6. The explosive detection unit 1 can be incorporated in a host device having an operation unit for a user to perform an input operation for inputting an ID or the like. For example, a gate device that restricts the passage of users in the aisle (automatic ticket gates installed at stations, airports, entrance / exit gate devices installed at the entrance / exit of an amusement facility, etc.) or a security room door It can be incorporated into various devices such as an entrance / exit control device that controls locking / unlocking of electronic locks, and an automatic transaction processing device such as ATM that performs transaction processing such as deposit / withdrawal transactions.

  The explosive detection unit 1 determines whether or not a user who uses the built-in host device has an explosive and notifies the host device of the determination result. The operation unit of the host device may be configured to input an ID or the like by a key operation, or may be configured to read card information from a medium such as a card in which the ID or the like is recorded as card information. Examples of this type of medium include a non-contact IC card having a wireless communication function and storing card information in a memory, a magnetic card having card information recorded in a magnetic stripe, and a card having card information printed with a barcode.

  Note that the host device incorporating the explosive detection unit 1 is a device or device not illustrated here as long as the user has a device or an operation unit for performing an input operation for inputting an ID or the like. Also good.

  The control unit 2 controls the operation of each part of the explosives detection unit 1 main body. The sampling unit 3 sucks air around the operation unit of the host device (not shown).

  The concentration detector 4 detects the concentration of explosives such as trinitrotoluene, black powder, TATP, ammonium nitrate, etc. contained in the air taken in by the collection unit 3. The concentration detection unit 4 detects the concentration of the explosive by ionizing the component of the explosive contained in the air sucked by the sampling unit 3 and detecting the mass thereof. Since the concentration detection unit 4 is publicly known, detailed description thereof is omitted here.

  The convection unit 5 convects air around the operation unit of the host device. The convection unit 5 may be configured to have a blower that blows wind around the operation unit, for example, or may be configured from an intake device that sucks air around the operation unit. The structure which has both machines may be sufficient.

  The input / output unit 6 controls input / output of a control signal and the like with a host device (not shown).

  Further, the control unit 2 stores a threshold value used for determining whether the user has an explosive based on the concentration of the explosive detected by the concentration detection unit 4 in a memory. There are two threshold values stored in the memory: an upper limit threshold value X and a lower limit threshold value Y. The upper threshold value X corresponds to the first threshold value referred to in the present invention, and the lower limit threshold value Y corresponds to the second threshold value referred to in the present invention. The upper limit threshold value X is a level at which it is possible to determine that there is a high possibility of possessing an explosive substance when this level is exceeded. Further, the lower limit threshold Y is a level at which it is possible to determine that there is a high possibility that the explosive substance is not possessed unless this level is reached. In addition, between the upper threshold value X and the lower threshold value Y, is the user detected for some reason an explosive substance concentration low, or conversely, is a user detected an explosive substance concentration high? It is a gray zone that cannot be judged, that is, whether or not an explosive is possessed.

  Next, the operation of the explosive detection unit 1 will be described. FIG. 3 is a flowchart showing the operation of the explosive detection unit. The explosive detection unit 1 normally stops the convection unit 5 and temporarily operates as necessary to convect the air around the operation unit of the host device. The host device incorporating the explosive detection unit 1 inputs a determination instruction to the explosive detection unit 1 when the user starts an input operation related to input of ID or the like in the operation unit. A determination instruction from the host device is input to the input / output unit 6.

  In the explosive detection unit 1, when a determination instruction is input from the host device (s1), the sampling unit 3 sucks and collects air around the operation unit (s2). In s2, the time for the sampling unit 3 to inhale the air around the operation unit is a predetermined time T1.

  The explosive detection unit 1 detects the concentration of explosives (trinitrotoluene, black explosive, TATP, ammonium nitrate, etc.) contained in the air around the operation unit that was inhaled by the sampling unit 3 this time in the concentration detection unit 4 (s3). . The concentration detection unit 4 detects the concentration of the explosive by ionizing the component of the explosive contained in the air sucked by the sampling unit 3 and detecting the mass thereof.

  As described above, the air whose concentration detection unit 4 detects the concentration of explosive is around the operation unit collected by the collection unit 3 when the user performs an input operation related to input of ID or the like in the operation unit. Air. Therefore, the air from which the concentration detection unit 4 detects the explosive concentration includes explosives attached to the hands and clothes (especially cuffs) of the user who is performing an input operation related to input of ID or the like at the operation unit. It is.

  If the concentration of the explosive detected by the concentration detection unit 4 exceeds the upper limit threshold value X, the control unit 2 notifies the host device that the user has an explosive (s4, s5). This notification is performed in the input / output unit 6.

  In addition, if the concentration of the explosive detected by the concentration detection unit 4 has not reached the lower limit threshold Y, the control unit 2 notifies the host device that the user does not have an explosive (s6, s7). . This notification is also made in the input / output unit 6.

  If the concentration of the explosive detected by the concentration detection unit 4 is between the upper limit threshold value X and the lower limit threshold value Y, the control unit 2 determines that re-determination is necessary for this user, and the operation unit The notification related to the request for the re-input operation is sent to the host device (s8). This notification is also made in the input / output unit 6.

  While the explosives detection unit 1 performs the above-described processing, the host device performs user authentication processing based on an ID or the like input at the operation unit. The host device determines that the user is an appropriate user if the user can be authenticated and there is a notification from the explosive detection unit 1 that no explosive is possessed.

  Further, if the user cannot be authenticated, the host device determines that the user is an improper user even if the explosive detection unit 1 notifies that the explosive detection unit 1 is not possessed.

  Further, if there is a notification from the explosive detection unit 1 that the explosive detection unit 1 has an explosive, the host device determines that the explosive is possessed regardless of whether or not the user has been authenticated.

  In addition, what is necessary is just to determine the process of the high-order apparatus with respect to a proper user, an improper user, and an explosives owner by the kind of the high-order apparatus, a use environment, etc.

  Furthermore, if there is a notification from the explosives detection unit 1 regarding the request for re-input operation (notification that re-determination is necessary) from the explosive detection unit 1, the host device can be used regardless of whether or not the user has been authenticated. The user is notified that an authentication failure due to an input error such as an ID has occurred, and a display output and a voice output for requesting the user to perform a re-input operation on the operation unit are performed.

  Note that the user is not informed that a determination is made as to whether or not an explosive is possessed.

  The explosives detection unit 1 temporarily operates the convection unit 5 when a notification related to a request for a re-input operation at the operation unit is given to the host device in s8 (s9). As a result, the air around the operation unit can be convected, accumulated in the periphery of the operation unit, and the remaining explosive can be removed.

The main reason why it is necessary to re-determine whether or not you have explosives is
(1) A user who actually possesses explosives, but the explosive adhering to the user's hand and clothes (especially cuffs) collects the air around the operating unit in the sampling unit 3 And explosives could not be properly collected due to the relative positional relationship between the hand and clothes of the user who entered the ID. (2) Although the user does not actually possess explosives There are two cases where explosives that have been dropped little by little by the multiple users who have been used in the past have accumulated, and the accumulated explosives have been collected.

  The explosive detection unit 1 waits for a redetermination instruction to be input from the host device (s10). The host device inputs a re-determination instruction to the explosive detection unit 1 when a user who has requested re-input of ID or the like starts a re-input operation related to re-input of ID or the like in the operation unit. In the explosive detection unit 1, when a redetermination instruction is input from the host device, the sampling unit 3 inhales air around the operation unit (s11), and repeats the processing after s3.

  In s12, the intake time for the collection unit 3 to collect the air around the operation unit is set to T2, which is longer than the time T1 in s2. As described above, the explosive adhering to the user's hand and clothes (especially the cuffs) can be collected more reliably by increasing the time for the collection unit 3 to inhale the air around the operation unit. Therefore, if the user is determined to need re-determination due to the above (1), this re-determination can determine that he has an explosive.

  In addition, as described above, the explosive detection unit 1 temporarily operates the convection unit 5 in s9 to convect the air around the operation unit, so that the explosive remaining around the operation unit at this time is removed. Removed. Therefore, if the user is determined to need re-determination due to the above (2), the re-determination can determine that he / she does not have explosives.

  As described above, the explosive detection unit 1 performs the determination again for the user in the gray zone (the explosive detection concentration is between the upper threshold value X and the lower threshold value Y). It is possible to improve the accuracy of determining whether or not you have

  Further, as described above, in this re-determination, the convection unit 5 is temporarily operated to convect the air around the operation unit, or the sampling unit 3 takes longer to inhale the air around the operation unit. The accuracy of determining whether or not the user has an explosive can be further improved.

  In addition, even if the same user repeats re-determination as to whether he / she has explosives a predetermined number of times (for example, once, twice, etc.), it is determined that re-determination is necessary every time. For the sake of convenience, it may be determined that the explosive is not possessed, or it may be determined that the explosive is possessed. This determination may be made according to the security level of the place.

  The explosive detection unit 1 may lower the upper limit threshold value X when re-determining whether the explosive is possessed. For example, at the time of redetermination, the upper threshold X may be set to a value that is 5% or 10% lower than the value stored in the memory.

  Next, an automatic ticket gate incorporating the above-described explosive detection unit 1 will be described. FIG. 4 is a block diagram showing the configuration of the main part of the automatic ticket gate. FIG. 5 is a schematic view showing the appearance of this automatic ticket gate. This automatic ticket gate 10 is installed at a ticket gate of a station, and a user who does not have a proper ticket or a user who has explosives passes through the ticket gate and enters the station. And restricting participation from the station premises. The automatic ticket gate 10 includes a control unit 11, a ticket processing unit 12, a user detection unit 13, a display unit 14, a door opening / closing unit 15, a notification unit 16, and the explosive detection unit 1 described above. It is equipped with. FIG. 5 shows two automatic ticket gates 10 facing each other, and the user's direction of travel in the ticket gate passage formed between these automatic ticket gates 10 is bidirectional.

  The control unit 11 controls the operation of each part of the automatic ticket gate 10 main body. As described above, the explosive detection unit 1 determines whether or not a user passing through the ticket gate has an explosive and notifies the control unit 11 of the automatic ticket checker 10 that is a host device. .

  The ticket processing unit 12 receives a ticket possessed by a user passing through the ticket gate, and reads and writes the ticket information including the ticket ID recorded on the received ticket. The boarding ticket processing unit 12 includes a wireless communication unit that performs wireless communication with a non-contact IC card. The ticket processing section 12 corresponds to the operation section referred to in the present invention. An antenna 12a for performing wireless communication with the non-contact IC card is provided on the entrance side of the ticket gate passage. The non-contact IC card is a ticket that has a wireless communication function and records ticket information in a built-in memory. The ticket processing unit 12 reads the ticket information recorded on the non-contact IC card and writes the ticket information on the non-contact IC card by wireless communication with the non-contact IC card.

  The user detection unit 13 detects the position of the user in the ticket gate passage by a plurality of sensors provided along the ticket gate passage at appropriate intervals. That is, the user detection unit 13 tracks the position of the user in the ticket gate passage from when the user enters the ticket gate passage until it passes through the ticket gate passage. Specifically, the sensor is a transmissive optical sensor, and a plurality of light emitting units are provided on one side of the automatic ticket gate 10 facing each other, and a light receiving unit is provided on the other side of the automatic ticket gate 10. It is a configuration. The automatic ticket gate 10 on the side where the light receiving unit is provided detects the presence or absence of a user for each light receiving unit based on the presence or absence of light reception in the light receiving unit. The automatic ticket gate 10 provided with the light emitting unit obtains a detection result from the automatic ticket gate 10 on the side provided with the light receiving unit.

  The display unit 14 displays, for example, a guidance message for a user passing through the ticket gate passage on a display 14a provided near the center of the ticket gate passage. Moreover, the door opening / closing part 15 restricts the passage of the user in the ticket gate passage by opening and closing the door 15a provided on the exit side of the ticket gate passage.

  The automatic ticket gate 10 also has a door 15a on the entrance side of the ticket gate passage. This door 15a on the entrance side opens and closes according to an instruction from the automatic ticket gate 10 on the opposite side.

  The notification unit 16 performs notification by a warning sound or the like when a user who has entered the ticket gate does not have a proper ticket or has an explosive. Also, the warning sound is different depending on whether the user does not have an appropriate ticket or an explosive. The station staff can determine whether the user is a user who does not have a proper ticket or a user who has explosives, based on the warning sound.

  The collection unit 3 of the explosive detection unit is attached so as to inhale and collect the air around the antenna 12a. The convection section 5 is attached so as to convect the air around the antenna 12a.

  Next, the operation of the automatic ticket gate 10 will be described. FIG. 6 is a flowchart showing the operation of the automatic ticket gate. The automatic ticket checker 10 starts the wireless communication with the non-contact IC card (ticket) on the antenna 12a in the ticket processing unit 12 (s21). The determined instruction is input (s22). Thereby, the explosives detection unit 1 starts the process shown in FIG.

  The automatic ticket gate 10 determines whether or not the user can pass through the ticket gate based on the ticket information acquired by wireless communication with the non-contact IC card (ticket) (s23). In s23, it is determined whether or not the boarding ticket possessed by the user is appropriate. Moreover, the automatic ticket gate 10 writes the boarding ticket information with respect to a non-contact IC card as needed. The automatic ticket gate 10 waits for the determination in the explosive detection unit 1 to be input (s24).

  When the automatic ticket gate 10 determines that the explosive detection unit 1 is a user who possesses an explosive, the notification section 16 informs the station staff that the explosive detection unit 1 is possessing the explosive. The warning notification to notify is performed (s25, s26). In s26, the door opening / closing part 15 closes the door 15a and restricts this user from passing through the ticket gate passage.

  If it is determined that the explosive detection unit 1 is a user who does not possess explosives, the automatic ticket gate 10 determines that the user is permitted to pass the ticket gate passage in s23. The opening / closing part 15 opens the door 15a to allow the user to pass through the ticket gate passage (s27, s28, s29). On the other hand, even if it is determined that the explosive detection unit 1 is a user who does not possess explosives, the automatic ticket gate 10 determines in s23 that the user is not permitted to pass the ticket gate passage. If so, the door opening / closing part 15 closes the door 15a and restricts the user from passing through the ticket gate (s27, s28, s30). Moreover, the automatic ticket gate 10 performs warning notification which notifies a station staff etc. that it is a user who does not have an appropriate boarding ticket in the alerting | reporting part 16 (s31).

  Note that the warning notification in s26 is different from the warning notification in s31. In addition, the determination that the above-mentioned ticket in the automatic ticket gate 10 is inappropriate is not only in the case where the ticket is actually inappropriate, but there may be a case in which reading information of the ticket information is poor. .

  In addition, when the explosive detection unit 1 determines that the explosive detection unit 1 is a user that needs to be re-determined, the display unit 14 displays on the display unit 14a that a reading failure of the ticket information has occurred ( s32), urging the user to place the contactless IC card on the antenna 12a again. At this time, in the automatic ticket gate 10, the door opening / closing unit 15 closes the door 15a, and the notification unit 16 issues a warning.

  When the user puts the non-contact IC card again on the antenna 12a (s33), the automatic ticket checker 10 inputs the above-described re-determination instruction to the explosive detection unit 1 (s34), and returns to s24.

  If the ticket checker information has already been properly read when the re-decision instruction is input, the automatic ticket checker 10 reads the ticket information from the non-contact IC card placed on the antenna 12a in s33. There is no need to do. On the other hand, if the ticket information is not properly read when the re-determination instruction is input, the ticket information may be read from the non-contact IC card trapped on the antenna 12a in s33.

  As described above, the automatic ticket gate 10 allows the built-in explosive detection unit 1 to accurately determine whether or not the user possesses the explosive, so that the user carrying the explosive is allowed to pass. In other words, terrorist acts cannot be prevented in advance, and conversely, the passage of users who do not have explosives is unnecessarily restricted and the service to the users is not deteriorated. Therefore, the prevention power against terrorism can be strengthened and the service to users can be improved.

  The explosives detection unit 1 according to the present invention is incorporated in various devices as long as the device has an operation unit for performing an input operation related to input of ID or the like as well as the automatic ticket gate 10 described above. be able to.

DESCRIPTION OF SYMBOLS 1 ... Explosives detection unit 2 ... Control part 3 ... Collecting part 4 ... Concentration detection part 5 ... Convection part 6 ... Input / output part 10 ... Automatic ticket gate 11 ... Control part 12 ... Passenger ticket processing part 12a ... Antenna 13 ... User Detection unit 14 ... Display unit 14a ... Display 15 ... Door opening / closing unit 15a ... Door 16 ... Notification unit

Claims (6)

A sampling unit that collects air around the operation unit where the user performs an input operation;
A concentration detection unit that detects the concentration of explosive substances contained in the air collected by the collection unit when a user performs an input operation on the operation unit;
For a user whose concentration of explosive substance detected by the concentration detector exceeds a first threshold, it is determined that the user possesses the explosive substance, and the concentration of explosive substance detected by the concentration detector For a user who has not reached the second threshold value lower than the first threshold value, it is determined that the user does not have an explosive substance, and the concentration of the explosive substance detected by the concentration detection unit is A determination unit that determines that a user between the first threshold value and the second threshold value is a user that needs to be determined again;
An explosives detection unit comprising: an output unit that outputs an output related to a request for a re-input operation at the operation unit to a user that the determination unit determines that re-determination is necessary.   The explosives detection unit according to claim 1, further comprising a convection unit that convects air around the operation unit when the determination unit determines that re-determination is necessary for the user.   The determination unit replaces the first threshold with a value lower than the first threshold for a user who has performed an output related to a request for re-input / re-operation in the operation unit. The explosive substance detection unit according to claim 1, wherein the user determines whether or not the user has an explosive substance.   For the user who has performed the output related to the request for re-input re-operation at the operation unit, when the user is performing the re-input operation at the operation unit, the collection unit The explosives detection unit according to claim 1, wherein the time for collecting ambient air is lengthened.   The explosive according to any one of claims 1 to 4, wherein the operation unit acquires medium information stored in the wireless communication medium by wireless communication with a wireless communication medium trapped in a wireless communication area. Detection unit. A gate device comprising the explosive detection unit according to any one of claims 1 to 5, and restricting the passage of a user in a passage,
A gate device provided with a notification unit for notifying a user who has been determined to possess an explosive substance by the determination unit of the explosive detection unit.

Images