GB2512577A - A sensor for an alarm system - Google Patents
A sensor for an alarm system Download PDFInfo
- Publication number
- GB2512577A GB2512577A GB1303309.7A GB201303309A GB2512577A GB 2512577 A GB2512577 A GB 2512577A GB 201303309 A GB201303309 A GB 201303309A GB 2512577 A GB2512577 A GB 2512577A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sensor
- alarm
- shock
- accelerometer
- detected
- 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
- G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/04—Mechanical actuation by breaking of glass
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/02—Monitoring continuously signalling or alarm systems
- G08B29/04—Monitoring of the detection circuits
- G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
A shock sensor 10 for an intruder alarm system comprises a micro electro-mechanical system (MEMS) accelerometer 11 which detects acceleration forces applied to the sensor 10 to trigger an alarm condition when a pre-determined output from the accelerometer 11 is detected. The accelerometer 11 enables the sensor 10 to detect shock (as in existing shock sensors), or motion, or both motion and shock, thus the sensor is able to detect the movement of a door or window being opened, even if there is no shock associated therewith. The shock sensor 10 may be connected to an alarm panel 14 which may activate a warning device 16 when an alarm condition is detected. The sensor 10 may be programmable by an external device.
Description
A SENSOR FOR AN ALARM SYSTEM
This invention relates to a sensor for an alarm system.
Intruder alarm systems generally comprise a plurality of magnetic switches and passive infra-red (PIP) detectors protecting primary access routes and designated areas within a building. Such devices will only trigger an alarm after an intruder has entered the building.
In order to detect an attempted break-in, it is well known to fit shock sensors to doors and windows, which senses actuate the alarm system when a shock or a predetermined pattern of shocks is detected that are indicative of a door or window being broken.
Hitherto known shock sensors have comprised a steel ball which is dislodged under a shock condition to open or close an electrical contact. While recently, shock sensors have comprised a piezo-electric sensor which converts mechanical deformation into an electrical signal, which can be used to actuate the alarm. Such devices have limited output information and thus is impossible to reliably discriminate between a normal shock and a shock caused by an actual attempted break-in.
Another disadvantage of such sensors is that they cannot detect a door or window being opened unless a shock occurs during the process.
We have now devised an improved sensor for an alarm system.
In accordance with the present invention, as seen from the first aspect, there is provided a sensor for an alarm system, the sensor comprising an accelerometer device which detects acceleration forces applied to the sensor to trigger an alarm condition.
The information output by an accelerometer is complex and can be analysed to discriminate between true and false alarm conditions. The accelerometer enables the sensor to detect shock (as in existing shock sensors) or motion, or both motion and shock, before triggering an alarm condition. Hence, the sensor is able to detect the movement of a door or window being opened even if there is no shock associated therewith.
Preferably the accelerometer outputs respective signals inductive of the magnitude of acceleration in three orthogonal axes, which signals can be analysed to trigger the alarm condition.
Preferably, the sensor comprises means for analysing the output of the accelerometer and for generating an alarm output when a pre-determined output from the accelerometer is detected.
Preferably the analysing means is programmable.
Preferably the sensor comprises means to enable the analysing means to be programmed, for example using an external device such as a computer.
The analysing means may comprise a learn mode, in which the pro-determined output is set by applying the level of motion and/or shock that would be expected to cause an alarm condition. The analysing means then stores this level of motion and/or shock and sets that as the pre-determined output.
Preferably, the analysing means can be interrogated by the external device to enable the stored pre-determined output to be displayed and/or analysed using the external device.
Preferably, the stored pie-determined output can be modified using the external device.
It will be appreciated that it is possible to have completely different settings for the sensitivity to movement and to shock: This could be important for use on a window, where it may be desirable for the sensor to be quite sensitive to movement, but insensitive to shock.
The sensor may comprise one or more potentiometers to enable the sensitivity of the sensor to be adjusted. Alternatively, the sensor may comprise one or more pairs of terminals across which selected resistive elements can be connected to set the desired sensitivity.
Preferably the sensor comprises a pair of terminals for connecting to a cable extending from a control panel of an alarm system, the sensor being arranged to change the state of electrical connection between the terminals when said predetermined signal from the accelerometer is detected.
Preferably the accelerometer is a micro electro-mechanical system (MEMS) device.
Preferably the sensor comprises a housing having means for mounting the sensor in-situ.
Preferably the housing comprises a removable cover and preferably means are provided for generating a tamper signal when the cover is removed.
Also in accordance with the present invention, there is provided an alarm system comprising one or more of the aforementioned shock sensors connected to a control panel, which control panel is arranged to actuate an audible and/or visual alarm signal when an alarm condition is detected by a said shock sensor.
Preferably the or each shock sensor is connected to the control panel via a cable or wirelessly.
An embodiment of the present invention will now be described by way of an example only, and with reference to the accompanying drawing, the single figure of which is a block diagram of an alarm system incorporating a shock sensor in accordance with the present invention.
Referring to the drawing, there is shown a shock sensor 10 in accordance with the present invention, the sensor comprising a MEMS accelerometer device 11 connected to a processing device 12. An input terminal 13 is provided for connecting the processing device 12 to an external computer (not shown). A pair of output terminals 20, 21 are connected to the processing device 12.
An alarm control panel 14 of conventional type is connected to the shock sensor 10 via an elongate cable 15. One or more audible and/or visual mourning devices 16 are connected to the control panel 14.
In use, the shock sensor 10 is fixed to a door or window. The accelerometer 11 produces respective output signals which are indicative of the magnitude of acceleration in 3 orthogonal axes. These signals are analysed by the processing device 12, which then changes the state of electrical connection between the terminals 20, 21 when a pre-programmed alarm condition is detected. The requirements for the alarm condition, such as the magnitude and frequency of movement in the 3 axes can be varied or set using a computer connected to the terminal 13. One or more potentiometers 17 may also be provided for adjusting the sensitivity of the sensor. Alternatively or additionally, pairs of terminals may be provided, between which selected resistors can be connected to vary the sensitivity of the sensor.
In use, the control panel 14 actuates the audible and/or visual warning device 16 when the change of state of electrical connection between the terminals 20-21 changes.
A shock sensor in accordance with the present invention is simple and inexpensive in construction, yet can reliably detect shocks and is less susceptible to false alarms.
Further more, the sensor is able to detect movement generally and thus can be used to detect when a door or window is opened.
Claims (4)
- CLAMS1. A senb for an aiarm system, the scor ofl1prt5ng an accelerometer devce which detetls acce!erahon fates appied to ne sensor to tnqger an aann condition.
- 2. A sensor a claimed. in claim: 1, in which the accelerometer outputs iespeciive EighSs indudtié at the manitude of acceleration in. three. orthogonal axes, whth:signals can, b nai'Se.d td trigger lbS alarm onditioft.
- 3. A sensor a claftnéd lO an preceding ciàim, irri which the sensor cornpriSs means for analys.tig the cutout of the roe erametci and for gereahny an alarm Output. whsi a r&determined output ftom the actelerornetet s detected..4A sensor as claimed in cm 3, hi Whith the analysing means is (\,J programmable c') 5. A sensor as claimed In claim 4, in which the sensor comprises means t O 20 Snable the andlysihg means to be programmed using an external d.evce.& A sedsor as claimed in any of claims 3 5 1n which anatysinc means conprses a learn mode, ii which the ore4eta mtned output s set by pplying the level c-f motion and/or shock that Wa be xoectSd lb c-aU cc. an 23 alarm condition the analysin9 means then being w-rarged to store thic evel of motion coo/or thock and to set that as sad pre-determned output 7 A sensor as dairned in ay of claims 6 4ppended to claim 5 in hich the analysrng means can be mteriogated b the extcrna device to enacle toe stored pre4eter'rrod oLOu& to se displayed anJ'o aoah,'sed usng the extsinai device.A sensor claimed in daim 4 inwhich the stprØ pre&-trmThed OUlput Cad be modffied..usin:g the exterrial.device.9. *A sensor as clathied to any precaang dant, comprising one or mori potePtiomters. to ehabe the ensitivity of the sensor to he adjusted.10. A sensOr as claimed n any of claims I to 8 comprising one or n'vore pairs of terrninas across hion selected resish's elirnents can be connocted to set the desired snsitMty.1 A sensor as camied in any p-eceou cia m, compnsing oaw of tenunals for c5nnéOtin to a cable extending from a control:P8. Of an Jarn ythem, the cc isoi being arranged to change the state of electrica' connectior between the termnals when Sd pred&ermined signS! from the acceleromete.r i detected, 12.A senSor Solainled in any preceding claim., in which the acc&erwneter is a xl&o eicctrG-*rnechano-svst*cm (MEfr1S) devitG. (SI0 3 A sensor as claimea n any preceding dawn, in which tie sensor carnprseb a co housing having means for mounting the sensor in-s tu o 20 1.
- 4. A sensor a tlaimsd in cSim i a. in whh the.housinp dmprisez a rethovahle covcr sic preterMly means are provided cr aererahnq a tamper signal wnen ills COVer renoVo, 15 A sensoi sibsa tiahy as herein deserted with reference *o the accompanying drawing.16 An alarm yste'n compnsing one or n'am of the censors ot claims to 14, the or each sensor being connected to a control panel hicb control panel is arranged to actuate ar audthle and'or visual alarm signal when an a1am' condthon is detected bb a said enso' 17, A alarm system as claimed in claim 1, in which ther ach.Shk 5neor i.connected to thecontro! pane! via a cable..1$. 1. alarm sstem as claimed hi cjairr 16, hi wh1⁄2h the or cech shock. senscr s wfrelessy connected to the contro panel 19. An a.rn1 system comprisng a sensora substantiaty as herein desc1bed with reference tothe accompanyIhg drawing.: (4 Co
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1303309.7A GB2512577B (en) | 2013-02-25 | 2013-02-25 | A sensor for an alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1303309.7A GB2512577B (en) | 2013-02-25 | 2013-02-25 | A sensor for an alarm system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201303309D0 GB201303309D0 (en) | 2013-04-10 |
| GB2512577A true GB2512577A (en) | 2014-10-08 |
| GB2512577B GB2512577B (en) | 2017-10-25 |
Family
ID=48092042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1303309.7A Active GB2512577B (en) | 2013-02-25 | 2013-02-25 | A sensor for an alarm system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2512577B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160223581A1 (en) * | 2013-09-09 | 2016-08-04 | Robert Bosch Gmbh | Shock Sensor |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2223583A (en) * | 1988-08-09 | 1990-04-11 | Clifford Electronics Inc | Programmable vibration sensor apparatus for producing an alarm signal |
| DE4420431A1 (en) * | 1994-06-10 | 1995-12-14 | Siemens Ag | Theft prevention system with micro-mechanical accelerometer |
| US20040012502A1 (en) * | 2000-10-26 | 2004-01-22 | Rasmussen John Olav | Alarm chip and use of the alarm chip |
| US20100032332A1 (en) * | 2008-08-08 | 2010-02-11 | Xitel Pty. Ltd. | Portable Security Container with Tilt and Movement Detection System |
| US20100302025A1 (en) * | 2009-05-26 | 2010-12-02 | Script Michael H | Portable Motion Detector And Alarm System And Method |
| US20110037588A1 (en) * | 2009-08-11 | 2011-02-17 | Tao Zeng | Wireless earthquake alarm based on mems accelerometers |
| FR2962837A1 (en) * | 2010-07-13 | 2012-01-20 | Lyce Conseil | Anti-theft system for photovoltaic or thermal solar panel installed on farm building, has beacon fixed to solar panel, and alarm center comprising antenna for communicating with antenna of beacon and alarm generation unit |
| WO2012023137A1 (en) * | 2010-08-19 | 2012-02-23 | Magal Security Systems Ltd. | A sensor for taut wire fences |
| US20120133511A1 (en) * | 2010-11-29 | 2012-05-31 | Honeywell International Inc. | Method and apparatus for detecting control panel attacks in a security system |
| WO2012096647A1 (en) * | 2011-01-10 | 2012-07-19 | Ingersoll-Rand Company | Door lock including sensor |
| EP2515282A1 (en) * | 2011-04-21 | 2012-10-24 | Securitas Direct AB | Security system |
-
2013
- 2013-02-25 GB GB1303309.7A patent/GB2512577B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2223583A (en) * | 1988-08-09 | 1990-04-11 | Clifford Electronics Inc | Programmable vibration sensor apparatus for producing an alarm signal |
| DE4420431A1 (en) * | 1994-06-10 | 1995-12-14 | Siemens Ag | Theft prevention system with micro-mechanical accelerometer |
| US20040012502A1 (en) * | 2000-10-26 | 2004-01-22 | Rasmussen John Olav | Alarm chip and use of the alarm chip |
| US20100032332A1 (en) * | 2008-08-08 | 2010-02-11 | Xitel Pty. Ltd. | Portable Security Container with Tilt and Movement Detection System |
| US20100302025A1 (en) * | 2009-05-26 | 2010-12-02 | Script Michael H | Portable Motion Detector And Alarm System And Method |
| US20110037588A1 (en) * | 2009-08-11 | 2011-02-17 | Tao Zeng | Wireless earthquake alarm based on mems accelerometers |
| FR2962837A1 (en) * | 2010-07-13 | 2012-01-20 | Lyce Conseil | Anti-theft system for photovoltaic or thermal solar panel installed on farm building, has beacon fixed to solar panel, and alarm center comprising antenna for communicating with antenna of beacon and alarm generation unit |
| WO2012023137A1 (en) * | 2010-08-19 | 2012-02-23 | Magal Security Systems Ltd. | A sensor for taut wire fences |
| US20120133511A1 (en) * | 2010-11-29 | 2012-05-31 | Honeywell International Inc. | Method and apparatus for detecting control panel attacks in a security system |
| WO2012096647A1 (en) * | 2011-01-10 | 2012-07-19 | Ingersoll-Rand Company | Door lock including sensor |
| EP2515282A1 (en) * | 2011-04-21 | 2012-10-24 | Securitas Direct AB | Security system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160223581A1 (en) * | 2013-09-09 | 2016-08-04 | Robert Bosch Gmbh | Shock Sensor |
| US10705111B2 (en) * | 2013-09-09 | 2020-07-07 | Robert Bosch Gmbh | Shock sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2512577B (en) | 2017-10-25 |
| GB201303309D0 (en) | 2013-04-10 |
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