EP1446783A1 - Wire security device for detecting theft of a protected object and operating method - Google Patents
Wire security device for detecting theft of a protected object and operating methodInfo
- Publication number
- EP1446783A1 EP1446783A1 EP02796842A EP02796842A EP1446783A1 EP 1446783 A1 EP1446783 A1 EP 1446783A1 EP 02796842 A EP02796842 A EP 02796842A EP 02796842 A EP02796842 A EP 02796842A EP 1446783 A1 EP1446783 A1 EP 1446783A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- detector
- link
- voltage
- sensor
- digital
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
- G08B13/1445—Mechanical actuation by lifting or attempted removal of hand-portable articles with detection of interference with a cable tethering an article, e.g. alarm activated by detecting detachment of article, breaking or stretching of cable
- G08B13/1454—Circuit arrangements thereof
Definitions
- Wired security device for detecting theft of an object to be protected and operating method
- the invention relates to a wired security device for detecting the theft of an object to be protected. It has its main applications in the trade where objects are disposed to the desire of consumers in order to report a theft or an attempted theft of said object.
- the invention also relates to a method of operating the device.
- Wired security systems against theft are known. They generally implement a detector comprising a sensor and arranged fixed on an object to be protected and connected by wires to a signaling unit which determines the state of the detector by measuring the voltage on the wires and, in particular, whether is either attached to the object or detached. In the event that the detector is detached, an alarm is generally triggered in order to attract the attention of the public and staff.
- OTT a Wired security systems against theft
- microswitch as a sensor, which is integrated in a box which is glued to the product to be protected either directly via an adhesive or through a sticky sole in order to be able to dissociate the product detector without having to change the adhesive every time.
- the disadvantage of the conventional three-wire system used with a microswitch is the fact that it cannot determine the presence of the detector if it is not stuck on the product when the installation is first energized.
- Another limitation of these known systems is that it uses fixed voltage detection ranges which leads to a limitation as to the electrical characteristics of the detector for the states that it is brought to encounter.
- the number of types of detectors that can be used is therefore necessarily reduced, which increases the risk that a malicious person will know these characteristics fairly quickly and can simulate the presence of a sensor and the presence of the object by tampering the system, or even, can use material recovered or stolen elsewhere.
- the object of the invention is therefore to make it possible to solve these problems and to obtain a system which is reliable while avoiding false detections, for example due to drifts, and responding effectively to attacks of the type of theft of the object or attempt to tampering with a reduced cost while being versatile.
- the invention relates to an electronic wired security device for detecting the theft of an object to be protected, the device comprising at least one detector connected by a wired electrical link to a signaling unit, the detector being arranged in relationship with an object to be protected, the detector having at least a first electrical state when it is in relation to the object and a second electrical state when the object is separated from the detector, the link transmitting the electrical state to the unit in the form of a determined voltage on the link, the unit comprising at least one threshold voltage comparator with inputs / outputs of which at least one input is connected to the detector by the link and of which at least one output indicates by signals at least the presence or absence of the object depending on the electrical state of the detector.
- the connection comprises two wires, a first of which is connected to a common point and the second is connected through at least one first resistor to a voltage generator relative to the common point, the second wire being connected to the input.
- the comparator comprises an analog digital voltage converter for digital measurements of the voltage and a central digital computing unit dependent on an operating program allowing the generation of the signals as a function of the digital comparison between the measurement and numerical reference thresholds.
- the term determined voltage corresponds both to a substantially continuous voltage (for example detector comprising a passive sensor of the switch type and resistors) as to a variable voltage (for example detector comprising a "communicating" electronic chip transmitting binary digital data) and the combination of the two (for example a detector associating a switch and a “communicating” electronic chip).
- the digital reference thresholds for generating signals as a function of the states therefore depend on the type of the determined voltage, in the first case exceeding one or more thresholds (for example output from a detection window corresponding to a given state) and in the second case, in addition to the previous thresholds, absence of data or data outside the expected values for a given state.
- the following means possibly combined according to all the technically possible possibilities, are used:
- the comparator implements detection windows limited by digital reference thresholds, each window corresponding to a given state of the detector,
- the digital reference thresholds are proportional to the voltage of the voltage generator
- the voltage generator is a fixed voltage regulator
- the voltage generator is a variable voltage regulator controlled by the central computing unit
- variable voltage regulator is a digital analog converter
- the digital reference thresholds are predetermined digital values in the case of a voltage generator which is a fixed voltage regulator
- the digital reference thresholds are digital values proportional to the results of generator voltage measurements by the analog to digital converter, - the digital reference thresholds are proportional to a moving average calculated over a determined number of digital measurements of the link voltage,
- the proportional term for the digital reference thresholds corresponds in practice to fractions of the value of the generator voltage or, in the case of averaged measurements of the connection, to fractions and multiples of the calculated average since the system is arranged so that the link voltage is produced by a resistive voltage divider in the case of a passive circuit and / or by a current / voltage generator / absorber in the case of an active circuit.
- digital reference thresholds linked to averaged measurements it is understood that it is also possible to define these thresholds as multiples of the average because this average is already the result of an analog division of the generator voltage by the first resistance and the active or passive charge provided by the detector
- the digital reference thresholds are proportional both to measurements of the link voltage (single or moving average) and of the generator voltage, (predetermined or measured digital),
- the link has two ends, the first end being connected to the unit and the second to a detector, - the link includes a means of connection / disconnection to the unit,
- the link includes a means of connection / disconnection to the detector, - the link has two ends, the first end being connected to the unit and at least one detector being plugged in at a point of the link, said plug-in ensuring the electrical connection between the wires of the link and the detector, the device comprises several links, each of the links comprising at least one detector,
- the device further comprises an analog multiplexer upstream of the analog to digital converter,
- the first resistor is placed between the voltage generator and the second wire connecting the input of the analog digital converter and the analog multiplexer
- the detector is passive and the electrical states are created by varying the resistance of the detector, the detector comprising a second resistance in series with a sensor which is a switch in mechanical relation to the object, the assembly being connected between the two son of the bond,
- the passive switch detector further comprises a third resistor between the two wires of the link, in parallel with the assembly, in order to allow the generation of at least a third state linked to the absence / presence of a detector on the link and in that the signals at the output of the comparator further indicate the absence or the presence of the detector on the link,
- the switch is mechanical (micro switch) or magnetic (flexible reed type bulb, a magnet being placed in relation to the object),
- the detector is passive and the electrical states are created by varying the resistance of the detector, the detector comprising a sensor which is a connector of the two wires of the connection and intended to be connected to a socket on the object to be protected, the grip of the object having a load resistance,
- the detector is passive and the electrical states are created by an active electronic circuit contained in the object to be protected, said circuit being connected to a socket on the object and the detector comprising a sensor which is a connector of the two wires of the connection and intended to be connected to a socket on the object to be protected,
- the detector is passive and the electrical states are created by communication with a communicating electronic system integrated into the product to be protected, the detector comprising a sensor which is a connector of the two wires of the link and intended to be connected to a socket on the object to be protected, taking the object having a connection with the electronic system internal to the product to be protected, (the communicating part is therefore integrated into the product),
- the passive connector detector also includes a third resistor between the two wires of the link in order to allow the generation of at least a third state linked to the absence / presence of a detector on the link and in that the signals in comparator output also indicates the absence or presence of the detector on the link,
- the device comprising means for determining the thresholds
- the device comprising means for determining the thresholds
- the device comprising means for determining the thresholds
- the detector is active and the electrical states are created by an active electronic circuit, the detector comprising at least one Hall effect sensor in relation to a static magnetic field generator fixed to the object to be protected,
- the active detector with Hall effect sensor (s) has a supply current causing a detectable voltage drop in the first resistor to allow the generation of at least a third state related to the absence / presence of detector on binding and in that the signals at the output of the comparator also indicate the absence or the presence of the detector on the link, (in this type of configuration, one can possibly do without a resistance between the two wires of the link because at least the active circuit is itself already a load which signals its presence on the link by the current which it consumes creating a potential difference across the terminals of the first resistance)
- the active detector with Hall effect sensor (s) further comprises a third resistor between the two wires of the link in order to allow the generation of at least a third state linked to the absence / presence of detector on the link and in that the signals at the output of the comparator further indicate the absence or the presence of the detector on the link, - the detector is active and comprises at least one communicating electronic chip supplying, transmitting and receiving binary data on a wired link to two sons,
- the detector with a communicating electronic chip comprises a switch in mechanical relation with the object and which is in series with the chip on the link,
- the detector with a communicating electronic chip further comprises a resistor between the two wires of the link in order to allow the generation of at least a third state linked to the absence / presence of a detector on the link and in that the signals in comparator output also indicates the absence or presence of the detector on the link,
- the detector with a communicating electronic chip also comprises a second chip between the two wires of the link in order to allow the generation of at least a third state linked to the absence / presence of a detector on the link and in that the signals at the output of the comparator further indicate the absence or the presence of the detector on the link,
- the device comprises means for determining the type of each detector of a given link during the first establishment of the link and / or each addition or withdrawal of detector or during a reset,
- the device comprises means for determining the digital reference thresholds for the link during the first setting up of the link and / or each addition or withdrawal of detector or during a reset,
- the wired link comprises at least one additional wire in order to supply at least one light-emitting diode in the detector, the light-emitting diode reflecting at least one output state of the comparator,
- the diode supply return is on a common wire
- the diode is of the two-color type by inversion of the polarity of its supply voltage with respect to the common point, - the signaling unit is connected by a computer link to a control center.
- the invention also relates to a method of operating a theft detection device comprising at least one detector connected by a wired electrical link to a signaling unit.
- the method in question is used on the previous device and according to one or more of the characteristics listed, and the voltage of the link is converted into a digital value and a comparison is made of said value with at least one digital reference threshold in order to to produce signals depending on the state of the detector.
- the operating process can also be declined according to all the methods of implementing the forms of the device as listed above.
- detection windows are determined limited by digital reference thresholds for the states transmitted by a detector link
- the reference thresholds are determined digital for a link and a given detector from a moving average of measurements made on said link and said detector for a given state
- each detector of a given link is also determined during the first installation of the link and / or each addition or withdrawal of detector or during a reset,
- the digital reference thresholds for the link are also determined during the first setting up of the link and / or each addition or withdrawal of detector or during a reset,
- the interest corresponds to at least one or more of the following actions by the consumer: handling the product, starting the product, duration of interest, date and time of interest.
- the advantages of the proposed analog-digital solution are, among others, the following: reduction of costs, improvement of the level of security while reducing erroneous trips, possibility of using with the same unit detectors of various types (passive or assets).
- the device being able to determine the thresholds, the device can use detectors whose electrical states can be chosen at random, the values of the resistances used being taken at random from a range of values. It therefore becomes impossible to determine the characteristics of a detector after analysis of the other detectors.
- detectors it is also possible to connect by the link a sensor, the type of which can be passive or active and even in the latter case of the active and "communicating" type (electronic chip that can communicate with the control unit) without the need to modify the interfacing between the line and the central unit, the digital analog converter being able to measure variable voltages corresponding to a digital data transmission by an active "communicating" sensor.
- the manufacture of detectors becomes less restrictive as regards the value of the components.
- the interchangeability of detectors with different characteristics by a user is also simplified. Since detectors may have different characteristics, It is also possible to determine the location (connection) of a given detector and of a given object, the detectors being able to be adapted to the protection of specific objects.
- the digital averaging of the input value for the determination of the detection thresholds makes it possible to perform effective filtering of the electrical disturbances which can be conveyed by the wired link which is generally lightly charged. It is thus possible to obtain a rejection of the industrial 50 Hz or 60 Hz by carrying out analog-digital conversions regularly according to a frequency multiple of the 50 Hz or 60 Hz and by averaging the measurements obtained.
- the digital processing carried out on the CAN measurements eliminates disturbances
- EMF especially rapid transients.
- the use of calculation algorithms based on the concept of the moving average makes it possible in particular to minimize the influence of fast transients.
- FIG. 1 represents a basic application of the invention
- Figure 2 shows an application to an object with a socket
- Figure 3 shows the implementation of a detector with Hall effect sensor according to a first mode
- Figure 4 shows the implementation of a detector with Hall effect sensor according to a second mode
- Figure 5 represents the implementation of a detector with Hall effect sensor according to a third mode
- Figure 6 represents a diagram of a device according to the invention
- Figure 7 represents the relations between zones, thresholds and voltages of a link
- Figures 8a to 8h represent algorithms for operating the device.
- Figures 9a and 9b show two other alternative detectors with flexible blade switch.
- Figure 1 corresponds to a circuit with a unit or distributor comprising a digital analog converter, or ADC, connected by a two-wire link to a passive detector which includes a sensor which is a switch.
- the first wire connects the ground of the CAN to one of the switch contacts ("switch"), the second wire, via a resistor R1, connects the input of the converter to the other contact of the switch.
- the arrangement of the switch in series with R1 can be reversed with respect to the ground wire. Between the two connecting wires is an R2 resistor.
- the converter input has a resistor R3 to return to the reference potential produced by a voltage generator and intended to form a divider bridge with the assembly (R1 + switch in series) // R2, located in the detector.
- the detector 1 comprises a switch and a resistor R1 in series on a resistor R2 in parallel on a link 2 with two wires connected to a signaling unit 3.
- the link 2 is connected on the one hand to a voltage source through a resistor R3 and on the other hand to a common point, the assembly with the detector forming a voltage divider.
- the detector If the detector is not connected to the system and therefore if the converter input is not connected to the switch, the voltage level is then identical to the reference voltage and the system considers that no detector is connected because the voltage drop in R3 is negligible, the analog digital converter 4 having a very high input impedance compared to the resistances of the device of which R3.
- R2 When the detector is in place, R2 shunts part of the link current and the voltage drop increases, signaling the presence of the detector.
- the object When the object is in relation to the detector, switch closed, the voltage drop is further increased because R1 and R2 are then in parallel. Finally during an attempt to short-circuit the voltage drops to zero and the current is limited by R3.
- the device there is at least one object presence detection window (digital thresholds), any measurement outside the window corresponding to an anomaly signal at the output of the digital comparator.
- object presence detection window digital thresholds
- Other windows can also be managed by the central unit and in particular, absence / presence of the detector; short circuit.
- the digital circuits for producing the status signals have not been shown. These circuits are conventionally a central microprocessor unit or a microcontroller with memory for an operating program (typically ROM, EPROM, EEPROM) and for storing data (RAM saved or not, EEPROM).
- a microcontroller with integrated analog digital converter is used and, if possible in some of the implementation modes with variable voltage generator, at least one digital analog converter, DAC. In the case where such a converter is not available in a microcontroller, it is possible to use binary digital outputs of the microcontroller connected to a network of RR / 2 resistors followed by an operational amplifier with low output impedance to simulate a DAC and get a programmable voltage.
- each link can have its DAC or a device with a single DAC + an analog multiplexer and an analog blocking circuit per link (blocker sampler allowing to keep an analog voltage for a determined time), allows to generate as many voltages as links.
- the advantage of using a voltage generator which can be controlled by program, a DAC is on the one hand to adapt the voltage on the link to a reduced consumption adapted to the load brought by the sensor and / or to a supply voltage adapted to an active sensor circuit and / or to be able to change this link voltage to make it more difficult to tamper with the detector and / or the link and finally in the case of an active circuit " sensor ”, to transmit digital data to said sensor in the form of a modulation of the link voltage.
- a voltage generator which can be controlled by program, a DAC
- the divider bridge formed by R3 and R2 gives a voltage which is located in a predefined area and recognized as corresponding to a connected but unstuck state.
- R2 is a resistor whose value is fixed and whose ratio with R1 is at least equal to 3 at the highest value thereof. If the switch is connected to the 'closed contact' system, i.e. glued to the product, the divider bridge is made using R3 and R2 in parallel with R1, the value of which can vary in a ratio of 10 and gives a value voltage on the link, the level of which will be within a range recognized by the comparator as being a detector present and stuck on an object. In a variant in which the absence of the sensor cannot be detected specifically relative to a stolen object, R2 can be omitted.
- the system measures the terminal voltage, determines detection thresholds and tracks drift so that it cannot generate an alarm due for example to an increase or decrease of the temperature.
- monitoring is ensured by averaging a certain number of previous measurements made, moving average.
- this threshold monitoring essentially concerns a detector present on a present object and that any exit from the window thus determined is an anomaly.
- the monitoring of the other states can however also be carried out by moving average, a change of state can mean that a user installs an object or a link with detector or a new detector.
- the implementation of monitoring and in particular of a moving average of digital measurements of the connection makes it possible to use narrow windows thus limiting the possibilities of tampering.
- the potential across the terminals of the converter becomes equal to the voltage of the voltage generator or reference potential and therefore above the maximum threshold of the normal operating window and generates an alarm.
- the thief In the case of putting a voltage source in parallel, the thief must first make sure of the voltage across the terminals of the detector to which he is attacking because, the value of R1 being random, he cannot trust to a preliminary test carried out on another detector. Once this value is known, it must set up a precision voltage source ( ⁇ 0.1V) with the lowest possible internal resistance because a sudden variation of ten millivolts can be enough to trigger the alarm in the case of a narrow window. The latter is highly unlikely in a store with vendors and video surveillance systems.
- the principle of analog detection can be extended according to Figure 2 without the need for a protection switch for any electrical or electronic or computer device having an electrical interface with an internal impedance compatible with the range of values of R1, the resistor R2 is placed directly in parallel with the impedance of the system to be protected in the event of connection and, as in the previous case, serves to ensure the detection of the state of the unconnected detector.
- the major advantage of such a solution is to avoid sticking a detector to the product by plugging into an electrical or electronic or computer outlet not used in demonstration mode. This type of detector is passive.
- This type of Hall effect sensor has an active element sensitive to a magnetic field. Associated with a magnet, it allows, for example, to control the opening of doors (showcase applications). It can be used with a 2-wire cord.
- Hall effect sensors There are two types of Hall effect sensors that can be used in the context of the invention, analog sensors whose output is a substantially linear function of the applied field (or other .logarithmic, sigmoid function, etc.) and all-or-nothing sensors. two states.
- Hall effect sensors are active electronic circuits, a power source is required. It can be supplied by a third wire on the link with return on the common point wire as in Figure 3.
- the sensor supply can also be supplied by a two-wire connection as in Figure 4.
- Vreg the voltage at the input of regulator 6, although variable depending on the response of the sensor, must not drop below the lower limit for regulating an output voltage Vreg. For example if Vreg is 5 Volts, the voltage drop across the regulator at least 2 Volts, we determine R3 so that the voltage between the two wires of the link does not drop below 7 Volts during variations of the output of the Hall sensor.
- FIG. 5 a variant can be envisaged by using two or three On / Off Hall effect sensors.
- the principle consists in using several detectors at different positions, which makes it possible to give information of different level depending on the displacement of the magnet.
- the generated voltage will be outside the programmed or calculated values, exceeding the thresholds, and therefore brought to an operation similar to that of an analog sensor with a possibly lower price taking into account higher prices of analog detectors compared to all or nothing detectors.
- RF tag radio tag type
- Active "communicating" electronic circuits of the electronic identification chip type which can communicate binary digital data by two-wire serial link and having a specific identity or address can also be used in the detectors. Their use corresponds to the production of active detectors according to the principle of the assembly of Figure 1 but where the resistor R1 is replaced by such a chip, R2 can be kept or not or also replaced by another chip. Such a chip can also be implemented according to the principle of Figure 2 but where R2 is replaced by said chip. However, in the latter case, the specific electrical characteristics of the product plug (the plug can generate a signal or data) must be taken into account to avoid any electrical or functional incompatibility.
- the “communicating” chip modulates the voltage of the link preferably at the request of the signaling unit.
- the signaling unit CAN having a sufficient signal acquisition frequency, equal to the modulation frequency of the chip to carry out a measurement per modulation cycle (measurement synchronized approximately in the middle of each cycle) if the latter is known a priori, that is at least twice the modulation frequency.
- the “communicating” chips transmit data on the link, modulate the voltage of the link, only the request of the signaling unit and it is thus possible either to synchronize the acquisitions, or to temporarily increase the acquisition frequency in order to be able to measure and reconstruct the data transmitted to the signaling unit.
- the request for data from the signaling unit is made by modulating the voltage generator.
- the request corresponds to the transmission of digital binary data signaling unit to the detector of a bond and there is "P reference implemented a DAC-circuit for the voltage generator.
- the voltage generator is a fixed voltage regulator controlled all or nothing.
- thresholds corresponding to the presence or absence of data coming from said chips can also be taken into account by the central unit.
- the advantage of the active detector with a “communicating” chip is that it allows the dissociation of the states “Detector DECOLLE” and “Detector DECONNECTE” unlike the All or nothing detector. When a detection unit is put into operation, the detectors taken off can therefore be identified. However, the time to establish communication with an identification chip reduces the maximum number of detectors of the same type that can be managed by the same signaling unit or the same dispatcher according to the embodiment. This number must be such as to guarantee a reasonable link scanning time.
- connections in the form of cables the ends of which include connectors intended to be connected at one end to the unit and at the second end to the sensor. It is thus possible to propose several link lengths for the same detector. As the device can detect the absence of the detector, an attempted theft with disconnection of the detector from the link will also be specifically reported. (third resistance implemented for specific detection of the absence of detector) or not (either that the object is separated from the detector or the detector separated from the link).
- the detector is connected directly to the link and a single connector is arranged on the side of the unit on the wired link.
- a CAN also allows the detection of other states than the minimum presence of the object, associated or not with the detection of the presence state of the detector and, in particular of states of use of the product, the term use may correspond to a handling or a starting of the product. It thus becomes possible, in addition to the basic security function (theft detection), to implement the device for marketing purposes (monitoring of the consumer's interest in such and such a product for example).
- a second pick-up or displacement detection switch switch sensitive to displacement: mercury or, preferably, ball
- a resistor in series, this assembly being in parallel on the one (with its resistance), for detecting the presence of the object.
- a detector of type 1 -a or 1 -b or 1-c can be combined with a connector on the object (in parallel with the detector of the previous type), the connector allowing the operation of the object. Thanks to the implementation of a CAN in the case of an object having a socket, it is also possible to consider the starting of the object.
- the object in question can be an electronic device, a game console or a computer or the like, the socket of which has defined states in operation, for example for a RS232 serial socket a voltage of + or - 10 volts.
- the unit can also determine these states and consider that the presence of such voltages is also normal. This latter state of functioning can also be 'signaled by the unit * in ⁇ the' case where one ' seeks to know the interest of consumers with respect to such and such a product, the start-up of the product corresponding to this interest.
- the socket can be a USB socket which also has predefined states. Preferably, the unit will determine these additional detection states during an initialization phase with switching on of the object.
- the voltage sent to the socket is as low as possible and , if possible at high impedance, to avoid overvoltages or the sending of a harmful intensity in the object. It is envisaged in particular to send a voltage below the threshold junction voltage of conventional semiconductor electronic circuits, and, for example, less than or equal to 0.6 volts for silicon. In this case, it will be possible to provide means for amplifying the signal of the link before conversion by ADC if the latter does not have sufficient resolution.
- said monitoring instead of being carried out downstream in the signaling unit, can be carried out upstream within a specialized circuit arranged at any point of the link, or even in the detector itself, and recording the states linked to the handling or use of the object.
- the specialized circuit is placed between the two wires of the link.
- Such an arrangement upstream of the signaling unit makes it possible to limit the software impact caused by the addition of this specific tracking functionality within the unit.
- an “intelligent” electronic chip which can record data coming from the signaling unit in order to store the uses of a given object.
- a third "smart""chip" connected - in parallel with "the other two will read the state of the displacement sensor (Digital, Analog or All or nothing).
- the statistical information associated with computer processing makes it possible to provide the customer with a marketing analysis on the products left in free touch.
- Each manipulation of a product will be memorized by the computer, then restored in graphic form (trend curve according to time slots, ).
- Conventional means of protection against electrostatic discharges and overvoltages can also be arranged at the input of the unit.
- the sensor can also include overvoltage protections.
- the circuits and software implemented in the signaling unit are conventionally a microprocessor circuit.
- the Figures relate to a single detector but it is also possible to implement a battery of detectors and links.
- each link has its own resistance for connection to the voltage generator in order to avoid interference between the different links, for example a short circuit on a link which should not disturb the others.
- the signaling unit can be a single box or be modular in the form of a network of boxes interconnected with each other according to any type allowed by the use of the microprocessor computer tool: tree structure, ring, linear ... It is thus possible to have specialized boxes arranged in different locations, a control and command box being arranged in a protected place, a signaling box arranged in the room where the protected objects are placed, a connection box for specific connections in if it is separate from the signal box.
- the signaling unit comprises means of the input / output type for initialization, activation or inactivation of a link, the activation being able to determine the thresholds of said link and sensor (s).
- the inputs / outputs can be simple: switch associated with one or more LEDs, light-emitting diode preferably, to signal the states for example, or more sophisticated type computer screen, keyboard, display in the form of color icons for example.
- the signaling unit here called a distributor, essentially comprises a microprocessor or microcontroller with CAN and voltage generator (regulator or DAC) and the inputs / outputs for initialization, activation or inactivation or the like, are deported within a remote control and command post with computer communication between the two.
- a distributor essentially comprises a microprocessor or microcontroller with CAN and voltage generator (regulator or DAC) and the inputs / outputs for initialization, activation or inactivation or the like, are deported within a remote control and command post with computer communication between the two.
- the computer program implemented in the unit may include means facilitating the determination of the thresholds. It is for example envisaged that in an object initialization phase, the user activates the object contact several times or moves the object away from the detector and determines thus the object presence / absence thresholds, an auditory or light signal that can be emitted to signal the end of the process.
- the unit is generally at a distance from the object and it is preferable to avoid comings and goings between the object, its detector and the unit. Such an operation can also be implemented in the case of detector presence / absence thresholds in an equivalent manner.
- the user can have a radio or infrared remote control to remotely control the unit and initialize or reset it manually.
- the thresholds are simply determined as a function of the presence of the sensor + object. In a more advanced alternative, the presence and absence of the sensor on the link are also considered.
- Figure 6 shows a preferred embodiment of the invention with regard to the signaling unit.
- the signaling unit is a distributor which communicates with a control center not represented by a bidirectional computer link 15.
- the distributor comprises a microcontroller 7 with a central unit (CPU) and memory, 8, the memory being intended on the one hand to store an operating program and on the other hand variables necessary for the execution of this program, in particular thresholds.
- a CAN 10 and inputs / outputs (I / O 9 or IN / OUT) are also available.
- a reference voltage is sent through a resistor R3, 11, to the CAN and a connecting wire through safety and filtering devices (cds: signal conditioner) and a multiplexer 14 allowing the selection of a link among several (n connections).
- the connection comprises a second wire connected to ground, common point.
- a third wire 12 for power supply is available on each link.
- the supply by this third wire 12 is controlled by a controlled gate 13 and it is possible to measure all or nothing via the input IN the voltage present or not on this third wire and in particular in the case of a short circuit or of the response d 'a communicating circuit in the event that said circuit returns data by this third wire.
- the CAN as explained above can also allow the reception of data on a two-wire link.
- the modulation from the dispatcher for data request can be carried out either through the inputs / outputs 9, or by means of the controlled door 13.
- a digital detector is a detector which includes at least one communicating chip capable of responding to the link when it is interrogated.
- An analog detector can be passive (switch and resistors for example) or active (Hall effect sensor for example).
- An active communicating detector is also called a digital detector.
- the measurements correspond to acquisitions of the signal (voltage) of the link considered by the ADC which provides digital results of M measurements or data depending on the type of detector. For reasons of simplification of the explanation, it has been considered here that each link can only have a detector at most. However, by modification of the algorithm, it is also possible to take into account more than one detector on the same link.
- Figure 8a corresponds to the initialization of the system and depending on the measurement M made with respect to the different possible zones Z1 ..Z5, signals can be generated.
- the measurements can correspond to simple link voltage measurements (passive or active analog detector) or to voltage measurements making it possible to determine the data transmitted (communicating detector). The latter case corresponds to a communication test. In a particular mode - it is also possible to carry out the communication test by the inputs / outputs of the microcontroller.
- Figure 8b corresponds to the reading of the detectors.
- Figure 8c corresponds to the interrogation of a digital detector.
- a software filtering module is implemented during the acquisition and the restitution of the data in the dispatcher.
- Figure 8d details the monitoring of the voltage by moving average on a link.
- a moving average over 3 measurements is implemented.
- the detection window is determined by the value ⁇ v, a subsequent measurement deviating from the moving average +/- ⁇ v being abnormal.
- Figure 8e corresponds to the case of a sabotage attempt (tampering).
- Figure 8f corresponds to a type 4 digital detector.
- Figure 8g corresponds to a detached analog or digital detector.
- Figure 8h corresponds to an absent or all or nothing detector taken off.
- the detector sensor can be a switch or, in relation to FIGS. 3, 4 and 5, the sensor can be an active circuit. sensitive to the Hall effect sensor type magnetic field. It is also possible to implement a switch which is sensitive to a magnetic field, of the type of switch with flexible blade (s) (ILS).
- ILS flexible blade
- FIG. 9a shows a detector comprising an ILS which, in the presence of a magnet in relation to an object to be protected and correctly positioned, is pasted thus signaling the presence of the object.
- Such an assembly although providing sufficient protection, may, however, be the object of attempts to neutralize it by implementing a strong magnet in the environment of the detector. A more efficient assembly is therefore proposed in FIG.
- ILS 9b 9b with two ILS, a first ILS1 and a second ILS2 in parallel with R1, that is to say disposed between the two wires of the connection) of the detector.
- the second ILS, ILS2 is normally open because the field of the magnet 1 - is sufficient to make ILS1 stick (when the object to be protected is in relation to the detector) but insufficient to make ILS2 stick.
- ILS2 will stick (short-circuiting the connection and / or ILS1 will take off according to the respective directions and intensities of the field of magnets 1 and 2. In all In this case, the signaling unit will signal an anomaly causing an alarm.
- the detector is active and the electrical states are created by an active electronic circuit, the sensor being a sensor physical parameter measurement including force, displacement, tilt, capacity, said parameter measurement sensor being fixed on the object to be protected and can be associated with a micr ocontroller in the detector.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0114670A FR2832245B1 (en) | 2001-11-13 | 2001-11-13 | WIRED SECURITY DEVICE FOR DETECTING THE FLIGHT OF AN OBJECT TO BE PROTECTED AND METHOD OF OPERATION |
FR0114670 | 2001-11-13 | ||
PCT/FR2002/003884 WO2003042944A1 (en) | 2001-11-13 | 2002-11-13 | .wire security device for detecting theft of a protected object and operating method |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1446783A1 true EP1446783A1 (en) | 2004-08-18 |
EP1446783B1 EP1446783B1 (en) | 2010-01-20 |
Family
ID=8869347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02796842A Expired - Lifetime EP1446783B1 (en) | 2001-11-13 | 2002-11-13 | Wire security device for detecting theft of a protected object and operating method |
Country Status (8)
Country | Link |
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US (1) | US6842114B2 (en) |
EP (1) | EP1446783B1 (en) |
AT (1) | ATE456116T1 (en) |
CA (1) | CA2466675C (en) |
DE (1) | DE60235185D1 (en) |
ES (1) | ES2339852T3 (en) |
FR (1) | FR2832245B1 (en) |
WO (1) | WO2003042944A1 (en) |
Families Citing this family (19)
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US7384300B1 (en) * | 1999-12-22 | 2008-06-10 | Xerox Corporation | Method and apparatus for a connection sensing apparatus |
US20050062606A1 (en) * | 2003-09-10 | 2005-03-24 | Ernst Konecnik | Arrangement and method for detecting unauthorized removal of electronic equipment |
US7352289B1 (en) * | 2003-09-11 | 2008-04-01 | Sun Microsystems, Inc. | System and method for detecting the connection state of a network cable connector |
FR2870366B1 (en) * | 2004-05-14 | 2006-06-30 | Valeo Climatisation Sa | INFORMATIVE NETWORK USING SECURE NODE IDENTIFICATION RESISTIVE SYSTEM |
US20090079566A1 (en) * | 2007-09-24 | 2009-03-26 | Invue Security Products, Inc. | Security device including sensor having an extension |
US20090223908A1 (en) * | 2008-03-07 | 2009-09-10 | Wal-Mart Stores, Inc. | Device Display Unit |
FR2949268B1 (en) * | 2009-08-20 | 2012-09-28 | Radio Systemes Ingenierie Video Technologies | DEVICE FOR DETECTION OF ENTRY AND RECOGNITION OF TRANSPONDER BADGES, MONITORING SYSTEM COMPRISING SAME, AND SURVEILLANCE METHOD USED THEREBY |
US8558414B2 (en) | 2010-08-11 | 2013-10-15 | Invue Security Products Inc. | Voltage regulator for merchandise display security device |
KR101143431B1 (en) * | 2011-10-12 | 2012-05-22 | 나기운 | Anticrime system using the sensor module |
US9466191B2 (en) * | 2013-07-05 | 2016-10-11 | Asustek Computer Inc. | Alarm device for securing a portable electronic device by detecting removal of an attached electrical interface |
WO2015112670A1 (en) | 2014-01-23 | 2015-07-30 | Invue Security Products Inc. | Systems and methods for security sensing in a power cable for an article of merchandise |
FR3019678A1 (en) * | 2014-04-03 | 2015-10-09 | Cameleon Group | ANTI-THEFT DEVICE OF PORTABLE DEVICES CONNECTED BY A WIRED CONNECTION TO A DISPLAY |
CN104183071A (en) * | 2014-08-29 | 2014-12-03 | 无锡物联网产业研究院 | Perimeter invasion detection device and system |
EP3289684A4 (en) * | 2015-04-29 | 2018-12-19 | Hewlett-Packard Development Company, L.P. | Connector element information detections |
CN106429298B (en) * | 2016-08-26 | 2018-06-05 | 安徽理工大学 | A kind of belt conveyor discerption detecting device |
US10659852B2 (en) | 2017-07-20 | 2020-05-19 | Hewlett-Packard Development Company, L.P. | Connector element information detections |
RU191575U1 (en) * | 2019-04-30 | 2019-08-14 | Общество с ограниченной ответственностью "ЕХ-ПРИБОР" | Magnetic contact security detector |
UA124046C2 (en) * | 2020-08-05 | 2021-07-07 | Аджакс Сістемс Кіпр Холдінгс Лтд | METHOD AND DEVICE OF SIGNAL TRANSMISSION FROM LEADING SECURITY SENSORS AND / OR FIRE DETECTORS |
RU2747489C1 (en) * | 2020-08-19 | 2021-05-05 | Акционерное общество "Научно-производственный комплекс "Дедал" | Barrier-type device for detecting intruders |
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US4213110A (en) * | 1978-07-20 | 1980-07-15 | Holce Thomas J | Proximity switch having adjustable sensitivity |
EP0116701B1 (en) | 1983-01-26 | 1987-06-03 | OTT, Reinhold | Anti-theft device |
US4536754A (en) * | 1983-05-13 | 1985-08-20 | Sentrol, Inc. | Magnetically retained connecting cable incorporating magnetically operated switch |
US5172098A (en) * | 1991-05-29 | 1992-12-15 | Se-Kure Controls, Inc. | Alarm system sensing and triggering apparatus |
JP3135473B2 (en) * | 1995-03-28 | 2001-02-13 | アルプス電気株式会社 | Theft monitoring device |
JP3135474B2 (en) * | 1995-04-07 | 2001-02-13 | アルプス電気株式会社 | Theft monitoring device |
US5748083A (en) * | 1996-03-11 | 1998-05-05 | Security Solutions Plus | Computer asset protection apparatus and method |
US5995003A (en) * | 1996-07-31 | 1999-11-30 | Rogers; Robert | Electronic pin fastener |
WO2000016284A1 (en) * | 1998-09-11 | 2000-03-23 | Key-Trak, Inc. | Tamper detection and prevention for an object control and tracking system |
-
2001
- 2001-11-13 FR FR0114670A patent/FR2832245B1/en not_active Expired - Fee Related
-
2002
- 2002-11-13 AT AT02796842T patent/ATE456116T1/en not_active IP Right Cessation
- 2002-11-13 DE DE60235185T patent/DE60235185D1/en not_active Expired - Lifetime
- 2002-11-13 WO PCT/FR2002/003884 patent/WO2003042944A1/en not_active Application Discontinuation
- 2002-11-13 ES ES02796842T patent/ES2339852T3/en not_active Expired - Lifetime
- 2002-11-13 CA CA2466675A patent/CA2466675C/en not_active Expired - Fee Related
- 2002-11-13 US US10/292,433 patent/US6842114B2/en not_active Expired - Fee Related
- 2002-11-13 EP EP02796842A patent/EP1446783B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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See references of WO03042944A1 * |
Also Published As
Publication number | Publication date |
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WO2003042944A1 (en) | 2003-05-22 |
CA2466675A1 (en) | 2003-05-22 |
US20030122672A1 (en) | 2003-07-03 |
EP1446783B1 (en) | 2010-01-20 |
ES2339852T3 (en) | 2010-05-26 |
ATE456116T1 (en) | 2010-02-15 |
US6842114B2 (en) | 2005-01-11 |
DE60235185D1 (en) | 2010-03-11 |
CA2466675C (en) | 2012-09-04 |
FR2832245B1 (en) | 2006-03-17 |
FR2832245A1 (en) | 2003-05-16 |
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