WO2018146674A1 - Door\window opening detector - Google Patents
Door\window opening detector Download PDFInfo
- Publication number
- WO2018146674A1 WO2018146674A1 PCT/IL2018/050131 IL2018050131W WO2018146674A1 WO 2018146674 A1 WO2018146674 A1 WO 2018146674A1 IL 2018050131 W IL2018050131 W IL 2018050131W WO 2018146674 A1 WO2018146674 A1 WO 2018146674A1
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- WO
- WIPO (PCT)
- Prior art keywords
- oscillator circuit
- frequency
- electromagnetic oscillator
- frequency range
- electromagnetic
- Prior art date
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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
- G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B45/00—Alarm locks
- E05B45/06—Electric alarm locks
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B45/00—Alarm locks
- E05B45/06—Electric alarm locks
- E05B2045/065—Switch or sensor type used in alarm locks
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B47/00—Operating or controlling locks or other fastening devices by electric or magnetic means
- E05B2047/0048—Circuits, feeding, monitoring
- E05B2047/0067—Monitoring
- E05B2047/0068—Door closed
Definitions
- the present invention relates generally to doorYwindow opening detectors.
- doorYwindow opening detector elements typically comprise a switch element mounted on a frame of a door or of a window to be monitored, whereby the switch element is typically connected to a detector element by one or more electrical conductors, such as copper wiring.
- This arrangement typically necessitates forming of apertures in a housing of the detector element, to allow for connection of the switch element to the detector element, which apertures allow the detector element to be exposed to damaging weather conditions when mounted outdoors. There, therefore, arises a need for a sealed detector element communicating with a switch element.
- the present invention seeks to provide improved doorY indow opening detectors.
- an electromagnetic circuit-opening detector including a sealed housing; an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer electromagnetic oscillator circuit including an outer inductive coil residing adjacent to an outer side of the sealed housing; an inner electromagnetic oscillator circuit residing within the sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, opposite the outer inductive coil and electromagnetically coupled thereto, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when the outer electromagnetic oscillator circuit is open; and an alarm indication generator operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range, for generating an indication indicating that the outer electromagnetic oscillator circuit is open.
- the circuit-opening indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
- the outer electromagnetic oscillator circuit includes an openable switch operable to be in at least one of an opened and a closed position.
- the outer electromagnetic oscillator circuit is open when the switch is in the opened position and the outer electromagnetic oscillator circuit is closed when the switch is in the closed position.
- the outer electromagnetic oscillator circuit also includes an end of line resistor.
- the end of line resistor is serially connected to the outer inductive coil.
- the end of line resistor is parallely connected to the outer inductive coil.
- the outer electromagnetic oscillator circuit is an LC oscillator circuit.
- an electromagnetic circuit-opening detection method including receiving an indication of a measurement of a frequency of an inner electromagnetic oscillator circuit residing within a sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, the inner inductive coil being electromagnetically coupled to an outer inductive coil of an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer inductive coil residing adjacent to an outer side of the sealed housing, opposite the inner inductive coil, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when the outer electromagnetic oscillator circuit is open and, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range, generating an indication indicating that the outer electromagnetic oscillator circuit is open.
- the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
- the outer electromagnetic oscillator circuit includes an openable switch operable to be in at least one of an opened and a closed position.
- the outer electromagnetic oscillator circuit is open when the switch is in the opened position and the outer electromagnetic oscillator circuit is closed when the switch is in the closed position.
- the outer electromagnetic oscillator circuit also includes an end of line resistor.
- the end of line resistor is serially connected to the outer inductive coil.
- the end of line resistor is parallely connected to the outer inductive coil.
- the inner electromagnetic oscillator circuit is an LC oscillator circuit.
- a doorYwindow opening detector including a sealed housing; an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer electromagnetic oscillator circuit including an outer inductive coil residing adjacent to an outer side of the sealed housing and an openable switch mounted on a doorYwindow, the openable switch being operable to be in an opened position when the doorYwindow is open and in a closed position when the doorYwindow is closed, the outer electromagnetic oscillator circuit being open when the switch is in the opened position and being closed when the switch is in the closed position; an inner electromagnetic oscillator circuit residing within the sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, opposite the outer inductive coil and electromagnetically coupled thereto, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when the outer electromagnetic oscillator circuit is
- the alarm indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
- the inner electromagnetic oscillator circuit is also preferably operable to oscillate at a third frequency within a third frequency range when the outer electromagnetic oscillator circuit is short circuited and the alarm indication generator is also operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range, for providing an alarm indication of tampering with the outer electromagnetic oscillator circuit.
- the alarm indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range.
- the inner electromagnetic oscillator circuit is also preferably operable to oscillate at a fourth frequency within a fourth frequency range when the outer electromagnetic oscillator circuit is severed and the alarm indication generator is also operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the fourth frequency range, for providing an alarm indication of tampering with the outer electromagnetic oscillator circuit.
- the alarm indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the fourth frequency range.
- the outer electromagnetic oscillator circuit also includes an end of line resistor.
- the end of line resistor is serially connected to the outer inductive coil.
- the end of line resistor is parallely connected to the outer inductive coil.
- the inner electromagnetic oscillator circuit is an LC oscillator circuit.
- the alarm indication generator is also operable for transmitting the alarm indication of opening of the doorYwindow to a premises monitoring system operable for monitoring a premises of the doorYwindow.
- transmitting the alarm indication of opening of the doorYwindow to the premises monitoring system operable for monitoring a premises of the doorYwindow includes wirelessly transmitting the alarm indication of opening of the doorYwindow to the premises monitoring system operable for monitoring a premises of the doorYwindow.
- a doorYwindow opening detection method including receiving an indication of a measurement of a frequency of an inner electromagnetic oscillator circuit residing within a sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, the inner inductive coil being electromagnetically coupled to an outer inductive coil of an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer inductive coil residing adjacent to an outer side of the sealed housing, opposite the inner inductive coil, the outer electromagnetic oscillator circuit also including an openable switch mounted on a doorYwindow, the openable switch being operable to be in an opened position when the doorYwindow is open and in a closed position when the doorYwindow is closed, the outer electromagnetic oscillator circuit being open when the switch is in the opened position and being closed when the switch is in the closed position, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed
- the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
- the inner electromagnetic oscillator circuit is also operable to oscillate at a third frequency within a third frequency range when the outer electromagnetic oscillator circuit is short circuited and the method also includes, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range, providing an alarm indication of tampering with the outer electromagnetic oscillator circuit.
- the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range.
- the inner electromagnetic oscillator circuit is also operable to oscillate at a fourth frequency within a fourth frequency range when the outer electromagnetic oscillator circuit is severed and the method also includes, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the fourth frequency range, providing an alarm indication of tampering with the outer electromagnetic oscillator circuit.
- the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range.
- the outer electromagnetic oscillator circuit also includes an end of line resistor.
- the end of line resistor is serially connected to the outer inductive coil.
- the end of line resistor is parallely connected to the outer inductive coil.
- the inner electromagnetic oscillator circuit is an LC oscillator circuit.
- the method also includes transmitting the alarm indication of opening of the doorWindow to a premises monitoring system operable for monitoring a premises of the doorWindow.
- transmitting the alarm indication of opening of the doorWindow to the premises monitoring system operable for monitoring a premises of the doorWindow includes wirelessly transmitting the alarm indication of opening of the doorWindow to the premises monitoring system operable for monitoring a premises of the doorWindow.
- Fig. 1A is a simplified illustration of a doorWindow opening detector, constructed and operative in accordance with a preferred embodiment of the present invention.
- Fig. IB is a simplified block diagram illustration of the doorWindow opening detector of Fig. 1A.
- FIG. 1A is a simplified illustration of a doorYwindow opening detector, constructed and operative in accordance with a preferred embodiment of the present invention.
- an outdoor doorYwindow opening detector 100 which is preferably mounted, for example, on an exterior frame 102 of a door 104 of premises 106, thereby being positioned to detect opening of door 104.
- doorYwindow opening detector 100 may be alternatively be mounted on a frame 108 of window 110 of premises 106, thereby being positioned to detect opening of window 110. It is appreciated that outdoor doorYwindow opening detector 100 is preferably employed, for example, as part of a monitoring system or an intrusion detection system operable for monitoring premises 106.
- Outdoor doorYwindow opening detector 100 preferably includes a switch component 112 and a magnetic sensor component 114, said magnetic sensor component 114 residing within a sealed housing 116. Sealed housing 116 is preferably mounted adjacent to switch component 112.
- Switch component 112 preferably includes an outer electromagnetic oscillator circuit 120 having an openable switch 122 mounted on exterior frame 102, openable switch 122 preferably being operable to be in an opened position when door 104 is open and in a closed position when the door 104 is closed. It is appreciated that switch 122 may be a magnetic contact switch as illustrated in Fig. 1A or any other suitable electromagnetic switch.
- Magnetic sensor component 114 residing within sealed housing 116 preferably includes an inner electromagnetic oscillator circuit 130 which is preferably electromagnetically coupled to outer electromagnetic oscillator circuit 120 of adjacent switch component 112. It is therefore appreciated that inner electromagnetic oscillator circuit 130 is operable to oscillate at a first frequency within a first frequency range when outer electromagnetic oscillator circuit 120 is closed and at a second frequency within a second frequency range when outer electromagnetic oscillator circuit 120 is open. As described hereinabove, openable switch 122 is preferably operable to be in an opened position when door 104 is open and in a closed position when the door 104 is closed. It is therefore a particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the second frequency range, magnetic sensor component 114 is operable to detect opening of door 104.
- Magnetic sensor component 114 is also preferably operable, in response to detecting opening of door 104, for wirelessly transmitting an alarm indication of opening of door 104 to a premises monitoring system 140 operable for monitoring premises 106. It is a particular feature of the present invention that the wireless nature of the electromagnetic coupling of inner electromagnetic oscillator circuit 130 to outer electromagnetic oscillator circuit 120 and of the transmission of the alarm indication of opening of door 104 to premises monitoring system 140 obviates the need for wired connection of magnetic sensor component 114 to switch component 112 and to premises monitoring system 140, thereby enabling sealing of magnetic sensor component 114 within sealed housing 116. It is appreciated that sealing of magnetic sensor component 114 within sealed housing 116 provides protection of magnetic sensor component 114 from damage which may be caused by exposure of magnetic sensor component 114, for example, to weather conditions such as rain and dust.
- inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a third frequency within a third frequency range when outer electromagnetic oscillator circuit 120 is short circuited, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the third frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
- inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a fourth frequency within a fourth frequency range when outer electromagnetic oscillator circuit 120 is severed, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore yet another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the fourth frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
- Fig. IB is a simplified block diagram illustration of the doorYwindow opening detector of Fig. 1A.
- outdoor doorYwindow opening detector 100 is preferably mounted, for example, on a frame of a door or of a window of a premises, thereby being positioned to detect opening of the door or of the window.
- outdoor doorYwindow opening detector 100 preferably includes a switch component 112 and a magnetic sensor component 114, said magnetic sensor component 114 residing within a sealed housing 116. Sealed housing 116 is preferably arranged to be mounted adjacent to switch component 112.
- switch component 112 preferably includes an outer electromagnetic oscillator circuit 120 residing outside of sealed housing 116.
- Outer electromagnetic oscillator circuit 120 preferably includes an openable switch 122 arranged for mounting on a frame of door or of a window, openable switch 122 preferably being operable to be in an opened position when the door or window is open and in a closed position when the door or window is closed. It is appreciated that switch 122 may be any suitable electromagnetic switch.
- Outer electromagnetic oscillator circuit 120 also preferably includes an outer inductive coil 150 residing adjacent to an outer side of sealed housing 116.
- outer electromagnetic oscillator circuit 120 also preferably includes an end of line resistor 152 serially connected to outer inductive coil 150.
- end of line resistor 152 may be parallely connected to outer inductive coil 150.
- Magnetic sensor component 114 residing within sealed housing 116 preferably includes an inner electromagnetic oscillator circuit 130.
- inner electromagnetic oscillator circuit 130 is an LC oscillator circuit.
- Inner electromagnetic oscillator circuit 130 preferably includes an inner inductive coil 154 residing adjacent to an inner side of sealed housing 116, opposite outer inductive coil 150 of outer electromagnetic oscillator circuit 120 of adjacent switch component 112 and is therefore electromagnetically coupled thereto. It is therefore appreciated that inner electromagnetic oscillator circuit 130 is operable to oscillate at a first frequency within a first frequency range when outer electromagnetic oscillator circuit 120 is closed and at a second frequency within a second frequency range when outer electromagnetic oscillator circuit 120 is open.
- openable switch 122 is preferably operable to be in an opened position when the door or window is open and in a closed position when the door or window is closed.
- inner electromagnetic oscillator circuit 130 also preferably includes capacitors 155 and 156 and a CMOS inverter 157.
- a power source such as a battery (not shown) is preferably provided for supplying power to inner electromagnetic oscillator circuit 130.
- Magnetic sensor component 114 also preferably includes an alarm indication generator 160.
- Alarm indication generator 160 is preferably operable for measuring the frequency of inner electromagnetic oscillator circuit 130 and for ascertaining, based on the measured frequency, whether the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the second frequency range. It is a particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the second frequency range, alarm indication generator 160 is operable to detect opening of the door or window. Alarm indication generator 160 is also preferably operable for wirelessly transmitting the alarm indication to a premises monitoring system 140 operable for monitoring a premises of the door or of the window.
- the wireless nature of the electromagnetic coupling of inner electromagnetic oscillator circuit 130 to outer electromagnetic oscillator circuit 120 and of the transmission of the alarm indication of opening of the door or window to premises monitoring system 140 obviates the need for wired connection of magnetic sensor component 114 to switch component 112 and to premises monitoring system 140, and therefore enables sealing of magnetic sensor component 114 within sealed housing 116. It is appreciated that sealing of magnetic sensor component 114 within sealed housing 116 provides protection of magnetic sensor component 114 from damage which may be caused by exposure magnetic sensor component 114, for example, to weather conditions such as rain and dust. As described hereinabove with reference to Fig.
- inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a third frequency within a third frequency range when outer electromagnetic oscillator circuit 120 is short circuited, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the third frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
- inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a fourth frequency within a fourth frequency range when outer electromagnetic oscillator circuit 120 is severed, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore yet another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the fourth frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
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Abstract
An electromagnetic circuit-opening detector including a sealed housing; an outer electromagnetic oscillator circuit residing outside of the sealed housing and including an outer inductive coiI residing adjacent to an outer side of the seal ed housing; an inner electromagnetic oscillator circuit residing within the sealed housing and including an inner inductive coil residing adjacent to an inner side of the sealed housing, opposite the outer inductive coil and electromagnetically coupled thereto, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency when the outer electromagnetic oscillator circuit is closed and at a second frequency when the outer electromagnetic oscillator circuit is open; and an alarm indication generator operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from the first frequency to the second frequency, for generating an indication indicating that the outer electromagnetic oscillator circuit is open.
Description
DOOR\WINDOW OPENING DETECTOR
FIELD OF THE INVENTION
The present invention relates generally to doorYwindow opening detectors.
BACKGROUND OF THE INVENTION Commercially available doorYwindow opening detector elements typically comprise a switch element mounted on a frame of a door or of a window to be monitored, whereby the switch element is typically connected to a detector element by one or more electrical conductors, such as copper wiring. This arrangement typically necessitates forming of apertures in a housing of the detector element, to allow for connection of the switch element to the detector element, which apertures allow the detector element to be exposed to damaging weather conditions when mounted outdoors. There, therefore, arises a need for a sealed detector element communicating with a switch element.
SUMMARY OF THE INVENTION
The present invention seeks to provide improved doorY indow opening detectors.
There is thus provided in accordance with a preferred embodiment of the present invention an electromagnetic circuit-opening detector including a sealed housing; an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer electromagnetic oscillator circuit including an outer inductive coil residing adjacent to an outer side of the sealed housing; an inner electromagnetic oscillator circuit residing within the sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, opposite the outer inductive coil and electromagnetically coupled thereto, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when the outer electromagnetic oscillator circuit is open; and an alarm indication generator operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range, for generating an indication indicating that the outer electromagnetic oscillator circuit is open.
Preferably, the circuit-opening indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
Preferably, the outer electromagnetic oscillator circuit includes an openable switch operable to be in at least one of an opened and a closed position. Preferably, the outer electromagnetic oscillator circuit is open when the switch is in the opened position and the outer electromagnetic oscillator circuit is closed when the switch is in the closed position.
Preferably, the outer electromagnetic oscillator circuit also includes an end of line resistor. Preferably, the end of line resistor is serially connected to the outer inductive coil. Alternatively, the end of line resistor is parallely connected to the outer inductive coil. Preferably, the outer electromagnetic oscillator circuit is an LC oscillator circuit.
There is also provided in accordance with another preferred embodiment of the present invention an electromagnetic circuit-opening detection method including receiving an indication of a measurement of a frequency of an inner electromagnetic oscillator circuit residing within a sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, the inner inductive coil being electromagnetically coupled to an outer inductive coil of an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer inductive coil residing adjacent to an outer side of the sealed housing, opposite the inner inductive coil, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when the outer electromagnetic oscillator circuit is open and, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range, generating an indication indicating that the outer electromagnetic oscillator circuit is open.
Preferably, the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
Preferably, the outer electromagnetic oscillator circuit includes an openable switch operable to be in at least one of an opened and a closed position. Preferably, the outer electromagnetic oscillator circuit is open when the switch is in the opened position and the outer electromagnetic oscillator circuit is closed when the switch is in the closed position.
Preferably, the outer electromagnetic oscillator circuit also includes an end of line resistor. Preferably, the end of line resistor is serially connected to the outer inductive coil. Alternatively, the end of line resistor is parallely connected to the outer inductive coil. Preferably, the inner electromagnetic oscillator circuit is an LC oscillator circuit.
There is further provided in accordance with yet another preferred embodiment of the present invention a doorYwindow opening detector including a sealed housing; an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer electromagnetic oscillator circuit including an outer inductive coil residing adjacent to an outer side of the sealed housing and an openable switch mounted on a doorYwindow, the openable switch being operable to be in an opened position when the doorYwindow is open and in a closed position when the doorYwindow is closed, the outer electromagnetic oscillator circuit being open when the switch is in the opened position and being closed when the switch is in the closed position; an inner electromagnetic oscillator circuit residing within the sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, opposite the outer inductive coil and electromagnetically coupled thereto, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when the outer electromagnetic oscillator circuit is open; and an alarm indication generator operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range, for providing an alarm indication of opening of the doorYwindow.
Preferably, the alarm indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
Additionally, the inner electromagnetic oscillator circuit is also preferably operable to oscillate at a third frequency within a third frequency range when
the outer electromagnetic oscillator circuit is short circuited and the alarm indication generator is also operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range, for providing an alarm indication of tampering with the outer electromagnetic oscillator circuit. Preferably, the alarm indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range.
Additionally, the inner electromagnetic oscillator circuit is also preferably operable to oscillate at a fourth frequency within a fourth frequency range when the outer electromagnetic oscillator circuit is severed and the alarm indication generator is also operable, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the fourth frequency range, for providing an alarm indication of tampering with the outer electromagnetic oscillator circuit. Preferably, the alarm indication generator is also operable for measuring the frequency of the inner electromagnetic oscillator circuit and for ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the fourth frequency range.
Preferably, the outer electromagnetic oscillator circuit also includes an end of line resistor. Preferably, the end of line resistor is serially connected to the outer inductive coil. Alternatively, the end of line resistor is parallely connected to the outer inductive coil. Preferably, the inner electromagnetic oscillator circuit is an LC oscillator circuit.
Preferably, the alarm indication generator is also operable for transmitting the alarm indication of opening of the doorYwindow to a premises monitoring system operable for monitoring a premises of the doorYwindow. Preferably, transmitting the alarm indication of opening of the doorYwindow to the premises monitoring system operable for monitoring a premises of the doorYwindow includes wirelessly transmitting the alarm indication of opening of the doorYwindow to the premises monitoring system operable for monitoring a premises of the doorYwindow.
There is yet further provided in accordance with yet another preferred embodiment of the present invention a doorYwindow opening detection method including receiving an indication of a measurement of a frequency of an inner electromagnetic oscillator circuit residing within a sealed housing, the inner electromagnetic oscillator circuit including an inner inductive coil residing adjacent to an inner side of the sealed housing, the inner inductive coil being electromagnetically coupled to an outer inductive coil of an outer electromagnetic oscillator circuit residing outside of the sealed housing, the outer inductive coil residing adjacent to an outer side of the sealed housing, opposite the inner inductive coil, the outer electromagnetic oscillator circuit also including an openable switch mounted on a doorYwindow, the openable switch being operable to be in an opened position when the doorYwindow is open and in a closed position when the doorYwindow is closed, the outer electromagnetic oscillator circuit being open when the switch is in the opened position and being closed when the switch is in the closed position, the inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when the outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when the outer electromagnetic oscillator circuit is open; and, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range, providing an alarm indication of opening of the doorYwindow.
Preferably, the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the second frequency range.
Additionally, the inner electromagnetic oscillator circuit is also operable to oscillate at a third frequency within a third frequency range when the outer electromagnetic oscillator circuit is short circuited and the method also includes, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range, providing an alarm indication of tampering with the
outer electromagnetic oscillator circuit. Preferably, the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range.
Additionally, the inner electromagnetic oscillator circuit is also operable to oscillate at a fourth frequency within a fourth frequency range when the outer electromagnetic oscillator circuit is severed and the method also includes, in response to receiving an indication that the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the fourth frequency range, providing an alarm indication of tampering with the outer electromagnetic oscillator circuit. Preferably, the method also includes measuring the frequency of the inner electromagnetic oscillator circuit and ascertaining, based on the measured frequency, whether the frequency of the inner electromagnetic oscillator circuit has changed from being within the first frequency range to being within the third frequency range.
Preferably, the outer electromagnetic oscillator circuit also includes an end of line resistor. Preferably, the end of line resistor is serially connected to the outer inductive coil. Alternatively, the end of line resistor is parallely connected to the outer inductive coil. Preferably, the inner electromagnetic oscillator circuit is an LC oscillator circuit.
Preferably, the method also includes transmitting the alarm indication of opening of the doorWindow to a premises monitoring system operable for monitoring a premises of the doorWindow. Preferably, transmitting the alarm indication of opening of the doorWindow to the premises monitoring system operable for monitoring a premises of the doorWindow includes wirelessly transmitting the alarm indication of opening of the doorWindow to the premises monitoring system operable for monitoring a premises of the doorWindow.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be understood and appreciated more fully from the following detailed description, taken in conjunction with the drawings in which:
Fig. 1A is a simplified illustration of a doorWindow opening detector, constructed and operative in accordance with a preferred embodiment of the present invention; and
Fig. IB is a simplified block diagram illustration of the doorWindow opening detector of Fig. 1A.
DETAILED DESCRIPTION OF PREFERRED EMB ODEVIENT S
Reference is now made to Fig. 1A, which is a simplified illustration of a doorYwindow opening detector, constructed and operative in accordance with a preferred embodiment of the present invention.
As shown in Fig. 1 A, there is provided an outdoor doorYwindow opening detector 100 which is preferably mounted, for example, on an exterior frame 102 of a door 104 of premises 106, thereby being positioned to detect opening of door 104. As further shown in Fig. 1A, doorYwindow opening detector 100 may be alternatively be mounted on a frame 108 of window 110 of premises 106, thereby being positioned to detect opening of window 110. It is appreciated that outdoor doorYwindow opening detector 100 is preferably employed, for example, as part of a monitoring system or an intrusion detection system operable for monitoring premises 106.
Outdoor doorYwindow opening detector 100 preferably includes a switch component 112 and a magnetic sensor component 114, said magnetic sensor component 114 residing within a sealed housing 116. Sealed housing 116 is preferably mounted adjacent to switch component 112.
Switch component 112 preferably includes an outer electromagnetic oscillator circuit 120 having an openable switch 122 mounted on exterior frame 102, openable switch 122 preferably being operable to be in an opened position when door 104 is open and in a closed position when the door 104 is closed. It is appreciated that switch 122 may be a magnetic contact switch as illustrated in Fig. 1A or any other suitable electromagnetic switch.
Magnetic sensor component 114 residing within sealed housing 116 preferably includes an inner electromagnetic oscillator circuit 130 which is preferably electromagnetically coupled to outer electromagnetic oscillator circuit 120 of adjacent switch component 112. It is therefore appreciated that inner electromagnetic oscillator circuit 130 is operable to oscillate at a first frequency within a first frequency range when outer electromagnetic oscillator circuit 120 is closed and at a second frequency within a second frequency range when outer electromagnetic oscillator circuit 120 is open. As described hereinabove, openable switch 122 is preferably operable to be in an
opened position when door 104 is open and in a closed position when the door 104 is closed. It is therefore a particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the second frequency range, magnetic sensor component 114 is operable to detect opening of door 104.
Magnetic sensor component 114 is also preferably operable, in response to detecting opening of door 104, for wirelessly transmitting an alarm indication of opening of door 104 to a premises monitoring system 140 operable for monitoring premises 106. It is a particular feature of the present invention that the wireless nature of the electromagnetic coupling of inner electromagnetic oscillator circuit 130 to outer electromagnetic oscillator circuit 120 and of the transmission of the alarm indication of opening of door 104 to premises monitoring system 140 obviates the need for wired connection of magnetic sensor component 114 to switch component 112 and to premises monitoring system 140, thereby enabling sealing of magnetic sensor component 114 within sealed housing 116. It is appreciated that sealing of magnetic sensor component 114 within sealed housing 116 provides protection of magnetic sensor component 114 from damage which may be caused by exposure of magnetic sensor component 114, for example, to weather conditions such as rain and dust.
It is appreciated that inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a third frequency within a third frequency range when outer electromagnetic oscillator circuit 120 is short circuited, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the third frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
It is further appreciated that inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a fourth frequency within a fourth frequency range when outer electromagnetic oscillator circuit 120 is severed, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore yet another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first
frequency range to being within the fourth frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
Reference is now made to Fig. IB, which is a simplified block diagram illustration of the doorYwindow opening detector of Fig. 1A. As described hereinabove with reference to Fig. 1A, outdoor doorYwindow opening detector 100 is preferably mounted, for example, on a frame of a door or of a window of a premises, thereby being positioned to detect opening of the door or of the window.
As further described hereinabove, outdoor doorYwindow opening detector 100 preferably includes a switch component 112 and a magnetic sensor component 114, said magnetic sensor component 114 residing within a sealed housing 116. Sealed housing 116 is preferably arranged to be mounted adjacent to switch component 112.
As shown in Fig. IB, switch component 112 preferably includes an outer electromagnetic oscillator circuit 120 residing outside of sealed housing 116. Outer electromagnetic oscillator circuit 120 preferably includes an openable switch 122 arranged for mounting on a frame of door or of a window, openable switch 122 preferably being operable to be in an opened position when the door or window is open and in a closed position when the door or window is closed. It is appreciated that switch 122 may be any suitable electromagnetic switch. Outer electromagnetic oscillator circuit 120 also preferably includes an outer inductive coil 150 residing adjacent to an outer side of sealed housing 116.
As further shown in Fig. IB, outer electromagnetic oscillator circuit 120 also preferably includes an end of line resistor 152 serially connected to outer inductive coil 150. Alternatively, end of line resistor 152 may be parallely connected to outer inductive coil 150.
Magnetic sensor component 114 residing within sealed housing 116 preferably includes an inner electromagnetic oscillator circuit 130. As illustrated in Fig. IB, inner electromagnetic oscillator circuit 130 is an LC oscillator circuit. Inner electromagnetic oscillator circuit 130 preferably includes an inner inductive coil 154 residing adjacent to an inner side of sealed housing 116, opposite outer inductive coil 150 of outer electromagnetic oscillator circuit 120 of adjacent switch component 112 and is therefore electromagnetically coupled thereto. It is therefore appreciated that inner electromagnetic oscillator circuit 130 is operable to oscillate at a first frequency
within a first frequency range when outer electromagnetic oscillator circuit 120 is closed and at a second frequency within a second frequency range when outer electromagnetic oscillator circuit 120 is open. As described hereinabove, openable switch 122 is preferably operable to be in an opened position when the door or window is open and in a closed position when the door or window is closed.
As further shown in Fig. IB, inner electromagnetic oscillator circuit 130 also preferably includes capacitors 155 and 156 and a CMOS inverter 157. A power source, such as a battery (not shown) is preferably provided for supplying power to inner electromagnetic oscillator circuit 130.
Magnetic sensor component 114 also preferably includes an alarm indication generator 160. Alarm indication generator 160 is preferably operable for measuring the frequency of inner electromagnetic oscillator circuit 130 and for ascertaining, based on the measured frequency, whether the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the second frequency range. It is a particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the second frequency range, alarm indication generator 160 is operable to detect opening of the door or window. Alarm indication generator 160 is also preferably operable for wirelessly transmitting the alarm indication to a premises monitoring system 140 operable for monitoring a premises of the door or of the window.
It is a particular feature of the present invention that the wireless nature of the electromagnetic coupling of inner electromagnetic oscillator circuit 130 to outer electromagnetic oscillator circuit 120 and of the transmission of the alarm indication of opening of the door or window to premises monitoring system 140 obviates the need for wired connection of magnetic sensor component 114 to switch component 112 and to premises monitoring system 140, and therefore enables sealing of magnetic sensor component 114 within sealed housing 116. It is appreciated that sealing of magnetic sensor component 114 within sealed housing 116 provides protection of magnetic sensor component 114 from damage which may be caused by exposure magnetic sensor component 114, for example, to weather conditions such as rain and dust.
As described hereinabove with reference to Fig. 1 A, it is appreciated that inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a third frequency within a third frequency range when outer electromagnetic oscillator circuit 120 is short circuited, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the third frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
As further described hereinabove with reference to Fig. 1A, it is further appreciated that inner electromagnetic oscillator circuit 130 is also preferably operable to oscillate at a fourth frequency within a fourth frequency range when outer electromagnetic oscillator circuit 120 is severed, such as by malicious tampering with electromagnetic oscillator circuit 120. It is therefore yet another particular feature of the present invention that by ascertaining that the frequency of inner electromagnetic oscillator circuit 130 has changed from being within the first frequency range to being within the fourth frequency range, magnetic sensor component 114 is operable to detect tampering with outer electromagnetic oscillator circuit 120.
It will be appreciated by persons skilled in the art that the present invention is not limited by what has been particularly shown and described hereinabove. Rather the scope of the present invention includes both combinations and subcombinations of the various features described hereinabove as well as modifications thereof which would occur to persons skilled in the art upon reading the foregoing description and which are not in the prior art.
Claims
1. An electromagnetic circuit-opening detector comprising:
a sealed housing;
an outer electromagnetic oscillator circuit residing outside of said sealed housing, said outer electromagnetic oscillator circuit comprising an outer inductive coil residing adjacent to an outer side of said sealed housing;
an inner electromagnetic oscillator circuit residing within said sealed housing, said inner electromagnetic oscillator circuit comprising an inner inductive coil residing adjacent to an inner side of said sealed housing, opposite said outer inductive coil and electromagnetically coupled thereto, said inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when said outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when said outer electromagnetic oscillator circuit is open; and
an alarm indication generator operable, in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range, for generating an indication indicating that said outer electromagnetic oscillator circuit is open.
2. An electromagnetic circuit-opening detector according to claim 1 and wherein said circuit-opening indication generator is also operable:
for measuring the frequency of said inner electromagnetic oscillator circuit; and
for ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range.
3. An electromagnetic circuit-opening detector according to either of claims
1 and 2 and wherein said outer electromagnetic oscillator circuit comprises an openable switch operable to be in at least one of an opened and a closed position.
4. An electromagnetic circuit-opening detector according to claim 3 and wherein said outer electromagnetic oscillator circuit is open when said switch is in said opened position and said outer electromagnetic oscillator circuit is closed when said switch is in said closed position.
5. An electromagnetic circuit-opening detector according to any of claims 1
- 4 and wherein said outer electromagnetic oscillator circuit also comprises an end of line resistor.
6. An electromagnetic circuit-opening detector according to claim 5 and wherein said end of line resistor is serially connected to said outer inductive coil.
7. An electromagnetic circuit-opening detector according to claim 5 and wherein said end of line resistor is parallely connected to said outer inductive coil.
8. An electromagnetic circuit-opening detector according to any of claims 1
- 7 and wherein said outer electromagnetic oscillator circuit is an LC oscillator circuit.
9. An electromagnetic circuit-opening detection method comprising:
receiving an indication of a measurement of a frequency of an inner electromagnetic oscillator circuit residing within a sealed housing, said inner electromagnetic oscillator circuit comprising an inner inductive coil residing adjacent to an inner side of said sealed housing, said inner inductive coil being electromagnetically coupled to an outer inductive coil of an outer electromagnetic oscillator circuit residing outside of said sealed housing, said outer inductive coil residing adjacent to an outer side of said sealed housing, opposite said inner inductive coil, said inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when said outer electromagnetic oscillator circuit is closed and at a
second frequency within a second frequency range when said outer electromagnetic oscillator circuit is open; and
in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range, generating an indication indicating that said outer electromagnetic oscillator circuit is open.
10. An electromagnetic circuit-opening detection method according to claim 9 and also comprising:
measuring the frequency of said inner electromagnetic oscillator circuit; and
ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range.
11. An electromagnetic circuit-opening detection method according to either of claims 9 and 10 and wherein said outer electromagnetic oscillator circuit comprises an openable switch operable to be in at least one of an opened and a closed position.
12. An electromagnetic circuit-opening detection method according to claim
11 and wherein said outer electromagnetic oscillator circuit is open when said switch is in said opened position and said outer electromagnetic oscillator circuit is closed when said switch is in said closed position.
13. An electromagnetic circuit-opening detection method according to any of claims 9 - 12 and wherein said outer electromagnetic oscillator circuit also comprises an end of line resistor.
14. An electromagnetic circuit-opening detection method according to claim 13 and wherein said end of line resistor is serially connected to said outer inductive coil.
15. An electromagnetic circuit-opening detection method according to claim
13 and wherein said end of line resistor is parallely connected to said outer inductive coil.
16. An electromagnetic circuit-opening detector according to any of claims 9
- 15 and wherein said inner electromagnetic oscillator circuit is an LC oscillator circuit.
17. A doorYwindow opening detector comprising:
a sealed housing;
an outer electromagnetic oscillator circuit residing outside of said sealed housing, said outer electromagnetic oscillator circuit comprising:
an outer inductive coil residing adjacent to an outer side of said sealed housing; and
an openable switch mounted on a doorYwindow, said openable switch being operable to be in an opened position when said doorYwindow is open and in a closed position when said doorYwindow is closed, said outer electromagnetic oscillator circuit being open when said switch is in said opened position and being closed when said switch is in said closed position;
an inner electromagnetic oscillator circuit residing within said sealed housing, said inner electromagnetic oscillator circuit comprising an inner inductive coil residing adjacent to an inner side of said sealed housing, opposite said outer inductive coil and electromagnetically coupled thereto, said inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when said outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when said outer electromagnetic oscillator circuit is open; and
an alarm indication generator operable, in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range, for providing an alarm indication of opening of said doorYwindow.
18. A doorYwindow opening detector according to claim 17 and wherein said alarm indication generator is also operable:
for measuring the frequency of said inner electromagnetic oscillator circuit; and
for ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range.
19. A doorYwindow opening detector according to either of claims 17 and 18 and wherein:
said inner electromagnetic oscillator circuit is also operable to oscillate at a third frequency within a third frequency range when said outer electromagnetic oscillator circuit is short circuited; and
said alarm indication generator is also operable, in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said third frequency range, for providing an alarm indication of tampering with said outer electromagnetic oscillator circuit.
20. A doorYwindow opening detector according to claim 19 and wherein said alarm indication generator is also operable:
for measuring the frequency of said inner electromagnetic oscillator circuit; and
for ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said third frequency range.
21. A doorYwindow opening detector according to any of claims 17 - 20 and wherein:
said inner electromagnetic oscillator circuit is also operable to oscillate at a fourth frequency within a fourth frequency range when said outer electromagnetic oscillator circuit is severed; and
said alarm indication generator is also operable, in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said fourth frequency range, for providing an alarm indication of tampering with said outer electromagnetic oscillator circuit.
22. A doorWindow opening detector according to claim 21 and wherein said alarm indication generator is also operable:
for measuring the frequency of said inner electromagnetic oscillator circuit; and
for ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said fourth frequency range.
23. A doorWindow opening detector according to any of claims 17 - 22 and wherein said outer electromagnetic oscillator circuit also comprises an end of line resistor.
24. A doorWindow opening detector according to claim 23 and wherein said end of line resistor is serially connected to said outer inductive coil.
25. A doorWindow opening detector according to claim 23 and wherein said end of line resistor is parallely connected to said outer inductive coil.
26. A doorWindow opening detector according to any of claims 17 - 25 and wherein said inner electromagnetic oscillator circuit is an LC oscillator circuit.
27. A doorWindow opening detector according to any of claims 17 - 26 and wherein said alarm indication generator is also operable for transmitting said alarm indication of opening of said doorWindow to a premises monitoring system operable for monitoring a premises of said doorWindow.
28. A doorYwindow opening detector according to claim 27 and wherein said transmitting said alarm indication of opening of said doorYwindow to said premises monitoring system operable for monitoring a premises of said doorYwindow comprises wirelessly transmitting said alarm indication of opening of said doorYwindow to said premises monitoring system operable for monitoring a premises of said doorYwindow.
29. A doorYwindow opening detection method comprising:
receiving an indication of a measurement of a frequency of an inner electromagnetic oscillator circuit residing within a sealed housing, said inner electromagnetic oscillator circuit comprising an inner inductive coil residing adjacent to an inner side of said sealed housing, said inner inductive coil being electromagnetically coupled to an outer inductive coil of an outer electromagnetic oscillator circuit residing outside of said sealed housing, said outer inductive coil residing adjacent to an outer side of said sealed housing, opposite said inner inductive coil, said outer electromagnetic oscillator circuit also comprising an openable switch mounted on a doorYwindow, said openable switch being operable to be in an opened position when said doorYwindow is open and in a closed position when said doorYwindow is closed, said outer electromagnetic oscillator circuit being open when said switch is in said opened position and being closed when said switch is in said closed position, said inner electromagnetic oscillator circuit being operable to oscillate at a first frequency within a first frequency range when said outer electromagnetic oscillator circuit is closed and at a second frequency within a second frequency range when said outer electromagnetic oscillator circuit is open; and
in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range, providing an alarm indication of opening of said doorYwindow.
30. A doorYwindow opening detection method according to claim 29 and also comprising:
measuring the frequency of said inner electromagnetic oscillator circuit; and
ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said second frequency range.
31. A door\window opening detection method according to either of claims
29 and 30 and wherein:
said inner electromagnetic oscillator circuit is also operable to oscillate at a third frequency within a third frequency range when said outer electromagnetic oscillator circuit is short circuited; and
said method also comprises, in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said third frequency range, providing an alarm indication of tampering with said outer electromagnetic oscillator circuit.
32. A doorYwindow opening detection method according to claim 31 and also comprising:
measuring the frequency of said inner electromagnetic oscillator circuit; and
ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said third frequency range.
33. A doorYwindow opening detection method according to any of claims 29
- 32 and wherein:
said inner electromagnetic oscillator circuit is also operable to oscillate at a fourth frequency within a fourth frequency range when said outer electromagnetic oscillator circuit is severed; and
said method also comprises, in response to receiving an indication that said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said fourth frequency range, providing an alarm indication of tampering with said outer electromagnetic oscillator circuit.
34. A doorWindow opening detection method according to claim 33 and also comprising:
measuring the frequency of said inner electromagnetic oscillator circuit; and
ascertaining, based on said measured frequency, whether said frequency of said inner electromagnetic oscillator circuit has changed from being within said first frequency range to being within said third frequency range.
35. A doorWindow opening detection method according to any of claims 29 - 34 and wherein said outer electromagnetic oscillator circuit also comprises an end of line resistor.
36. A doorWindow opening detection method according to claim 35 and wherein said end of line resistor is serially connected to said outer inductive coil.
37. A doorWindow opening detection method according to claim 35 and wherein said end of line resistor is parallely connected to said outer inductive coil.
38. A doorWindow opening detection method according to any of claims 29 - 37 and wherein said inner electromagnetic oscillator circuit is an LC oscillator circuit.
39. A doorWindow opening detection method according to any of claims 29 - 38 and also comprising transmitting said alarm indication of opening of said doorWindow to a premises monitoring system operable for monitoring a premises of said doorWindow.
40. A doorWindow opening detection method according to claim 39 and wherein said transmitting said alarm indication of opening of said doorWindow to said premises monitoring system operable for monitoring a premises of said doorWindow comprises wirelessly transmitting said alarm indication of opening of said doorWindow to said premises monitoring system operable for monitoring a premises of said doorWindow.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1702077.7 | 2017-02-08 | ||
| GB1702077.7A GB2559563B (en) | 2017-02-08 | 2017-02-08 | Door\Window opening detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018146674A1 true WO2018146674A1 (en) | 2018-08-16 |
Family
ID=58462455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IL2018/050131 WO2018146674A1 (en) | 2017-02-08 | 2018-02-06 | Door\window opening detector |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2559563B (en) |
| WO (1) | WO2018146674A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3087472B1 (en) * | 2018-10-23 | 2020-11-13 | Delta Dore | METHOD AND DEVICE FOR DETECTION OF THE TYPE OF OPENING ON WHICH A DETECTION DEVICE IS INSTALLED |
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| US4103283A (en) * | 1976-10-06 | 1978-07-25 | The B. F. Goodrich Company | Tire inflation monitoring system |
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| US4808973A (en) * | 1987-10-02 | 1989-02-28 | Avinadav Siev | Window tape alarm interlock device |
| US5619188A (en) * | 1995-10-20 | 1997-04-08 | Honeywell Inc. | Proximity sensor which is sensitive to a pulsating magnetic field |
| CA2497220A1 (en) * | 2004-02-17 | 2005-08-17 | Sensormatic Electronics Corporation | Method and apparatus to detect an external source |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4148008A (en) * | 1977-09-29 | 1979-04-03 | Lusk Joe F | Tire pressure monitoring system |
| DE4300350A1 (en) * | 1993-01-08 | 1994-07-14 | Hirschmann Richard Gmbh Co | Intrusion alarm system, e.g. for mounting on window |
-
2017
- 2017-02-08 GB GB1702077.7A patent/GB2559563B/en active Active
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- 2018-02-06 WO PCT/IL2018/050131 patent/WO2018146674A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3602884A (en) * | 1970-02-11 | 1971-08-31 | Joseph S Brumbelow | Tire condition monitoring system |
| US3641552A (en) * | 1970-02-18 | 1972-02-08 | Int Assemblix Corp | Centrally located access alarm system |
| US4057783A (en) * | 1973-11-07 | 1977-11-08 | Jaeger | Device for transmitting the condition of a switch between two parts in relative rotary movement |
| US4103283A (en) * | 1976-10-06 | 1978-07-25 | The B. F. Goodrich Company | Tire inflation monitoring system |
| JPS59194293A (en) * | 1983-04-18 | 1984-11-05 | 松下電器産業株式会社 | Tire air pressure sensor |
| US4808973A (en) * | 1987-10-02 | 1989-02-28 | Avinadav Siev | Window tape alarm interlock device |
| US5619188A (en) * | 1995-10-20 | 1997-04-08 | Honeywell Inc. | Proximity sensor which is sensitive to a pulsating magnetic field |
| CA2497220A1 (en) * | 2004-02-17 | 2005-08-17 | Sensormatic Electronics Corporation | Method and apparatus to detect an external source |
| US20070194895A1 (en) * | 2006-02-23 | 2007-08-23 | Dymos Co., Ltd. D/B/A Dymos Of America | Tire pressure monitoring system and sensor therefor |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB2559563A (en) | 2018-08-15 |
| GB201702077D0 (en) | 2017-03-22 |
| GB2559563B (en) | 2022-08-03 |
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