WO2017144859A1 - Détecteur optique de sécurité - Google Patents

Détecteur optique de sécurité Download PDF

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Publication number
WO2017144859A1
WO2017144859A1 PCT/GB2017/050385 GB2017050385W WO2017144859A1 WO 2017144859 A1 WO2017144859 A1 WO 2017144859A1 GB 2017050385 W GB2017050385 W GB 2017050385W WO 2017144859 A1 WO2017144859 A1 WO 2017144859A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical fibre
optical
signal
return signal
detector according
Prior art date
Application number
PCT/GB2017/050385
Other languages
English (en)
Inventor
Christopher Ralph Pescod
Original Assignee
Bae Systems Plc
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
Priority claimed from EP16275031.9A external-priority patent/EP3210839A1/fr
Priority claimed from GB1603076.9A external-priority patent/GB2547649A/en
Application filed by Bae Systems Plc filed Critical Bae Systems Plc
Publication of WO2017144859A1 publication Critical patent/WO2017144859A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/30—Detection related to theft or to other events relevant to anti-theft systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
    • G08B13/186—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier using light guides, e.g. optical fibres
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems

Definitions

  • the following invention relates to apparatus and methods for securing a body using an optical detector, particularly to apparatus and methods used to detect ingress into the covered trailer of a lorry.
  • an optical detector comprising an optical fibre, a transmitter arranged to transmit a transmission signal through the optical fibre, a reflector arranged to provide a return signal through the optical fibre, a receiver to receive said return signal, a monitor arranged to compare the transmission signal with the return signal, and an indicator arranged to inform a user when there is a difference between the transmission signal and the return signal.
  • the transmission signal may be a simple pulse or continuous signal.
  • the optical fibre may carry data, such as, for example relaying data from a video surveillance system monitoring the body.
  • the transmitter and receiver may be a transceiver and may convert the signal from an electrical signal to an optical signal and vice versa.
  • the monitor and/or indicator may be attached to or integrated with the body being monitored, and/or remote from the body being monitored with communication through a wired or wireless connection.
  • the indicator may be audible and/or visible.
  • An audible and/or visible indicator gives those responsible for monitoring the body an indication that the body has been tampered with. It may also act as a deterrent to the individual or individuals that are tampering with the body and/or detector.
  • the indicator may be a status indicator highlighting to the user that the optical fibre has or hasn't been tampered with.
  • the indicator may be singularly or a combination of siren, horn, alarm, text or voice message, flashing and continuous light, or a latched switch.
  • the audible/visible indicator may be attached to or integrated with the body being monitored, and/or remote from the body being monitored with communication through a wired or wireless connection.
  • the indicator may indicate to a user the position where the tampering occurred.
  • optical fibre may be plastic or glass.
  • Plastic optical fibre may be a polymer, and glass optical fibre may be silica, fluoride glass, phosphate glass or chalcogenide glass. ln a further arrangement of the invention the optical fibre may be embedded within a housing.
  • Embedding the optical fibre within a housing may protect the optical fibre from accidental damage.
  • the housing may strengthen the optical fibre and if a covert optical detector is required, it may reduce the chances of the optical fibre being identified by those wishing to tamper with the body and/or optical detector.
  • the housing may be a sheath, cladding, jacket, a fibre reinforced polymer composite structure, fabric, polymer, cable, a strengthening member or an integral part of the body.
  • the optical fibre is a single mode fibre.
  • a single mode fibre is more difficult to repair compared to a multi-mode fibre as the fibre core is significantly smaller (for example, 8 microns compared to 50 microns) and the cores have to be precisely aligned in order to make an effective repair.
  • a physical carrier medium such as an optical fibre to transmit the optical signal, rather than transmission of a beam of light, as commonly found in domestic alarms, is that any movement of the body during its normal and intended use may give rise to false alarms.
  • a vehicle trailer once secured, especially with soft sides, will flex and distort during normal use, and further any movement of the cargo contained therein may also cause an emitted beam of light through the air to be broken.
  • the use of an optical fibre reduces the incidents of a false alarm, as breaking the fibre requires a shearing force to break the fibre rather than mere misalignment of a beam, readily caused by flexing of the body or movement of contents within the body during normal use.
  • the monitor may comprise an optical splitter/combiner or optical circulator which is used to route the transmission signal to the optical fibre and route the return signal to the optical receiver.
  • the distal end of the optical fibre may be provided with a mirrored surface.
  • a mirrored surface removes the need for a separate reflector or a second transmitter at the distal end of the optical fibre to provide the return signal.
  • the mirrored surface may be a mirror, retroreflector or fibre optic reflector.
  • an optical tamper evident device comprising an optical detector as defined herein.
  • the optical tamper evident device comprises an optical detector comprising an optical fibre, a transmitter arranged to transmit a transmission signal through the optical fibre, a reflector arranged to provide a return signal through the optical fibre, a receiver to receive said return signal, a monitor arranged to compare the transmission signal with the return signal, and an indicator arranged to inform a user when there is a difference between the transmission signal and the return signal.
  • the optical tamper evident device uses optical fibre in the detector to ensure that attempts to gain access to the body by tampering with the detector will be highlighted to a user as the round trip time delay as well as the intensity of the return signal will change if the optical fibre is damaged or disconnected. This change in round trip delay time and intensity enables the indicator to determine the position of the damage in the optical cable.
  • a body to be monitored comprising a storage area, at least one closure for closing the storage area, locking means for keeping the closure in a substantially closed position, and the detector as defined herein, to detect ingress to the storage area, wherein the optical fibre is operably linked to the closure and or locking means, and is configured to indicate to a user that the storage area has been accessed.
  • an optical fibre operably linked to the body ensures that the detector will monitor attempts to gain access to the body, as tampering with the optical fibre will be highlighted to a user; as the round trip time delay as well as the intensity of the return signal will change if the optical fibre is damaged or disconnected. This change in round trip delay time and intensity enables the indicator to determine the position of the damage in the optical cable and therefore whereabouts on the body, such as, for example a storage area has been accessed.
  • the storage area may be a trailer, an ISO container, an intermodal container, a room or building, or any enclosable area.
  • the closure for closing the storage area may be at least one door, soft sided curtains or flaps, articulated cover or window.
  • the locking means may be any routinely used fastener, such as, for example a cam lock or ratchet strap.
  • the monitor and indicator may be singly or in combination attached to or integrated with the body being monitored.
  • the monitor and/or indicator may be remote from the body being monitored with communication through a wired or wireless connection.
  • the use of remote monitoring allows disconnected trailers or containers to be monitored even when the cab is not attached.
  • the indicator may notify a central command centre or the vehicles driver by means of a mobile device.
  • the optical fibre forms an integral part of the closure, locking means or is embedded within the body.
  • optical fibre when formed as an integral part of the enclosure protects the optical fibre from accidental damage, strengthens the detector, and reduces the chances of the optical fibre being identified by those wishing to tamper with the optical fibre or detector. Integral may be, such as, for example embedded within, adjacent to or connected to.
  • the body is a vehicle, vessel or craft.
  • the vehicle, vessel or craft may be in the land, air or maritime domain.
  • the body may be a lorry with a fixed or articulated trailer (and optionally removable from the cab).
  • the transmitter, receiver, monitor and indicator may singly or in combination be in the cab or the trailer.
  • a method of detecting access to a body comprising the steps of:
  • V indicating to a user the result of the comparison.
  • the comparing step comprises determining a characteristic aspect of the signal, such as for example the intensity, frequency, amplitude or round trip time delay of the reflected return signal.
  • comparison of the round trip time delay may provide the location of the break in the optical fibre.
  • a vehicle, vessel or craft comprising an optical detector as described herein.
  • an optical detector comprising an optical fibre, a transmitter arranged to transmit a transmission signal through the optical fibre, a receiver arranged to receive said transmission signal, a monitor arranged to compare the transmission signal with a reference signal, and an indicator arranged to inform a user when there is a difference between the transmission signal and the reference signal.
  • an electrical detector for a body to be monitored comprising a body, said body comprising a storage area, at least one closure for closing the storage area, a locking means for keeping the closure in a substantially closed position, said electrical detector comprising an electrical conductor, a power source connected to the electrical conductor and arranged to energise the electrical conductor, a monitor arranged to detect changes in the electrical characteristics in the electrical conductor, and an indicator arranged to inform a user of changes in electrical characteristics in the electrical conductor, wherein the electrical conductor is operably linked to the closure and/or locking means.
  • the electrical characteristics may be resistance, or may be the change in an electronic signal or electrical pulse passed through the electrical conductor.
  • the electrical detector comprises a second electrical conductor arranged to provide a return electrical path to the monitor arranged to detect changes in the electrical characteristics between the electrical conductor and the second electrical conductor.
  • the electrical conductor may be electrically isolated from the body, by means of a nonconducting outer layer.
  • Figure 1 shows a plan view of a body comprising an optical detector according to the present invention.
  • Figure 2 shows a plan view of a body comprising an optical detector according to the present invention.
  • Figure 3 shows a schematic of an optical detector according to the present invention.
  • Figure 4 shows an example difference in timing between an optical fibre which hasn't been damaged and an optical fibre which has been damaged.
  • a body 1 which forms a storage area 10 comprising a closure 7 for closing the storage area 10, the closure 7, shown in a closed position, will be held in a closed position by locking means 9.
  • the storage area 10 has an optical fibre 2 around the boundary of the storage area 10.
  • the optical fibre 2 is connected to a transmitter and receiver in the form of a transceiver 4 which is in turn connected to a monitor and indicator 5. Opening the closure 7 to an open position 8 will cause the optical fibre 2 to be broken, thereby resulting in a change in the signal received by transceiver 4, which is detected and actioned by the monitor and indicator 5.
  • FIG. 2 shows a lorry 1 1 comprising a trailer 20 and a cab 21 .
  • the trailer 20 is a soft sided trailer which is closed by an articulated curtain 17.
  • the articulated curtain 17 is locked to the base of the trailer 20 by multiple cam locks 19.
  • locking means in the form of a steel tilt cable 13 is unwound from a spool 16 at the rear of the trailer 20 and threaded through each of the multiple cam locks 19.
  • the steel tilt cable 13 is then clamped in place at an anchor point 22.
  • an optical fibre 12 runs through each of the multiple cam locks 19 and is integrated with the steel tilt cable 13 and articulated curtain 17.
  • optical fibre 12 is shown adjacent to the steel tilt cable 13, and is clamped in place with a fibre optic clamp 18 at the rear of the trailer 20.
  • the optical fibre 12 is then connected to an optical transmitter and receiver 14 which converts the received optical signal into an electronic signal for processing by the monitor and indicator 15.
  • optical transmitter and receiver 14, 14' for each optical fibre 12, 12', however, a single optical transmitter and receiver 14 could be used with the arrangement on each side of the trailer having an individual signal signature to differentiate between the multiple optical cables 12 and 12'.
  • the optical transmitter and receiver 14, 14' and the monitor and indicator 15 are located in the cab 21 .
  • Figure 3 shows the monitor and indicator 35 which generates an electrical signal to be monitored and an optical transmitter 34a which converts the electrical signal to an optical signal.
  • the optical signal is routed through an optical splitter/combiner 37 and along the optical fibre 32 of length L.
  • the optical signal is reflected back along the optical fibre 32 by a reflector 38 located at the distal end of the optical fibre 32 where the optical splitter/combiner 37 separates the reflected optical signal from the optical signal being transmitted by the optical transmitter 34a.
  • the reflected signal is then received at an optical receiver 34b which converts the optical signal into a received electrical signal which can be processed by the monitor and indicator 35.
  • the monitor and indicator 35 compares the intensity or time of arrival of the received electrical signal with the electrical signal to be monitored to determine whether the optical fibre 32 has been damaged. For clarity the electrical signal to be monitored and received electrical signal are shown in Figure 4 as pulsed signals.
  • the expected time delay of the received electrical signal TL along the optical fibre 32 of length L and the amplitude of the received electrical signal when compared to the electrical signal to be monitored are monitored by the monitor and indicator 35. If there is a break 36 in the optical fibre 32 as shown in Figure 3 then the length of the connected fibre is reduced to a break length LB which will result in a change from the expected time delay of the received electrical signal TL to a time delay determinate by the position of the break TB.
  • the break 36 results in a reduction in amplitude of the received electrical signal as shown in Figure 4.
  • This reduction in amplitude and the change in time delay of the received electrical signal will result in the monitor and indicator 35 of Figure 3 indicating the presence and position of the break 36 as calculated by the monitor and indicator 35.
  • the result will be the same if there is an attempt to repair the break 36 by using a mirrored surface or attenuator at the break 36, as the time delay of the received electrical signal will not be the expected time delay of the received electrical signal TL and/or the received electrical signal will have a different amplitude.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mechanical Engineering (AREA)
  • Burglar Alarm Systems (AREA)
  • Optical Communication System (AREA)
  • Alarm Systems (AREA)

Abstract

L'invention concerne un appareil et des procédés de fixation d'un corps à l'aide d'un détecteur optique, en particulier un appareil et des procédés utilisés pour détecter une intrusion dans la remorque couverte d'un camion. L'invention concerne un détecteur optique pour un corps (1) destiné à être surveillé, comportant un corps, ledit corps (1) comprenant une zone de stockage (10), au moins une fermeture (7) destinée à fermer la zone de stockage (10), un moyen de verrouillage pour garder la fermeture dans une position sensiblement fermée, ledit détecteur optique comprenant une fibre optique, un émetteur (14) conçu pour émettre un signal d'émission par le biais de la fibre optique (2), un réflecteur (38) conçu pour fournir un signal de retour par le biais de la fibre optique (2), un récepteur pour recevoir ledit signal de retour, un moniteur (15) conçu pour comparer le signal d'émission avec le signal de retour, ainsi qu'un indicateur (15) conçu pour informer un utilisateur en cas de différence (99) entre le signal d'émission et le signal de retour, la fibre optique (2) étant liée de façon fonctionnelle au moyen de fermeture et/ou de verrouillage et étant conçue pour indiquer à un utilisateur que la zone de stockage (10) a été atteinte.
PCT/GB2017/050385 2016-02-23 2017-02-14 Détecteur optique de sécurité WO2017144859A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP16275031.9A EP3210839A1 (fr) 2016-02-23 2016-02-23 Détecteur optique de sécurité
EP16275031.9 2016-02-23
GB1603076.9 2016-02-23
GB1603076.9A GB2547649A (en) 2016-02-23 2016-02-23 Optical security detector

Publications (1)

Publication Number Publication Date
WO2017144859A1 true WO2017144859A1 (fr) 2017-08-31

Family

ID=58057168

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2017/050385 WO2017144859A1 (fr) 2016-02-23 2017-02-14 Détecteur optique de sécurité

Country Status (1)

Country Link
WO (1) WO2017144859A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013908A (en) * 1988-11-28 1991-05-07 Kaman Sciences Corporation Break detection system using optical fibers having unique frequency modulated light
AU2526492A (en) * 1991-09-20 1993-03-25 Kevin Rex Burr Improvements in alarms
WO2001039148A1 (fr) * 1999-11-24 2001-05-31 Future Fibre Technologies Pty Ltd Procede et systemes de surveillance d'une barriere de protection perimetrique
EP1489570A1 (fr) * 2003-06-17 2004-12-22 Comsec Corp. Ltd. Système de détection d'effraction
US6980108B1 (en) * 2002-05-09 2005-12-27 Fiber Instrument Sales Optical fiber cable based intrusion detection system
US20060197665A1 (en) * 2005-01-26 2006-09-07 Sanki Eng. Co., Ltd. Break-in detection sensor
CN104021638A (zh) * 2014-07-03 2014-09-03 中交第二公路勘察设计研究院有限公司 一种高速公路沿线电缆预警防盗的方法及装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5013908A (en) * 1988-11-28 1991-05-07 Kaman Sciences Corporation Break detection system using optical fibers having unique frequency modulated light
AU2526492A (en) * 1991-09-20 1993-03-25 Kevin Rex Burr Improvements in alarms
WO2001039148A1 (fr) * 1999-11-24 2001-05-31 Future Fibre Technologies Pty Ltd Procede et systemes de surveillance d'une barriere de protection perimetrique
US6980108B1 (en) * 2002-05-09 2005-12-27 Fiber Instrument Sales Optical fiber cable based intrusion detection system
EP1489570A1 (fr) * 2003-06-17 2004-12-22 Comsec Corp. Ltd. Système de détection d'effraction
US20060197665A1 (en) * 2005-01-26 2006-09-07 Sanki Eng. Co., Ltd. Break-in detection sensor
CN104021638A (zh) * 2014-07-03 2014-09-03 中交第二公路勘察设计研究院有限公司 一种高速公路沿线电缆预警防盗的方法及装置

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