GB2415536A - Intruder detection system for access hatches - Google Patents
Intruder detection system for access hatches Download PDFInfo
- Publication number
- GB2415536A GB2415536A GB0512065A GB0512065A GB2415536A GB 2415536 A GB2415536 A GB 2415536A GB 0512065 A GB0512065 A GB 0512065A GB 0512065 A GB0512065 A GB 0512065A GB 2415536 A GB2415536 A GB 2415536A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hatch
- detection system
- intruder detection
- access hatches
- attack
- 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
- 238000001514 detection method Methods 0.000 title claims description 8
- 238000005553 drilling Methods 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/02—Mechanical actuation
- G08B13/06—Mechanical actuation by tampering with fastening
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
- G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/12—Manhole shafts; Other inspection or access chambers; Accessories therefor
- E02D29/14—Covers for manholes or the like; Frames for covers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Burglar Alarm Systems (AREA)
Abstract
The system comprises an antenna 1 for wireless communication, preferably between a slave unit 4 housed in an access hatch 3 and a master unit 6 housed in another access hatch 3 or in a control centre. The antenna 1 is attached to the metal access hatch 3 via a strong magnet (2) and uses the hatch itself as a radio frequency transmission medium. A hardware and software sensing arrangement may be used to detect attacks in the form of drilling, cutting, grinding or hammering of the access hatch 3.
Description
24 1 5536 Intruder Detection System for Access Hatches This invention
relates to a wireless alarm system that can detect and verify an illegal attempt to open or breach an access hatch that provides protection for an asset.
Companies operating in the water, gas, electricity and other utility industries need to protect their assets to ensure the safety of customers and provide uninterrupted supply of commodity. The threat of vandalism, terrorism or extortion means that points of access are vulnerable to attack. These include inspection and access hatches that may be remote and outside secure premises. Rapid response to any attack is required to limit any damage to assets, people or the environment. This will entail an alarm condition triggering a police response, which is governed by restrictions imposed in the UK by the ACPO (Association of Chief of Police Officers).
Any alarm that has the potential to initiate police response must be verified before action is taken. Increasingly, companies are looking for low cost, easily maintainable solutions to address this issue.
This invention offers a detection system that is low cost, simple to install and verifies an alarm condition that could signify an attack on a hatch.
The main problem associated with installation of detection systems of this type is that long runs of expensive cabling is required to link hatches to a central monitoring point so that an alarm signal may be transmitted to a control centre. The cost of the cabling and installation is very high. Because each hatch requires a unit (slave) containing a set of sensors located within the hatch, traditional wireless systems have difficulty penetrating the hatch's metallic construction, resuming in reduced operating range and reliability. This invention uses an antenna design that attaches to the wall of the hatch by a strong magnet and electro magnetically couples radio frequencies through the hatch to the atmosphere.
Figure 1 shows an antenna 1 attached to the inside wall of a hatch 3 via a strong magnet 2. The antenna is connected to the slave unit 4, housed within the hatch by cable 5.
The slave unit contains a radio frequency transceiver unit that operates in the license-free ISM (Industrial, Scientific & Medical) bands within the restrictions of the regulatory document CEPT/ERC/70-03. This communicates with a master unit situated in another hatch or control hut.
Figure 2 shows the overall detection system configuration. Multiple slave units 4 within hatches 3 communicate wirelessly with a master unit 6 via antennas 1.
Each slave and master unit contains sensors capable of detecting attack by: 1) Forced opening of the hatch cover 2) Drilling, cutting or grinding of the hatch cover 3) Hammering on the hatch cover
4) Introduction of liquid contaminant
These sensors use a dual-technology approach to verify that an actual attack is taking place rather than a random disturbance or accidental trigger event.
Specifically, this invention uses a variable hardware and software algorithm to verify attack by portable hand tools such as drills, angle grinders and thermal cutting devices. The mechanical strength of hatches reduce the speed at which a successful attack may take place, therefore it may take 30 seconds or more to breach a hatch successfully. This invention monitors audio and vibration disturbances over an adjustable timeline to determine whether a real attack is in progress. If two thresholds are crossed, an alarm is communicated necessitating police response.
Figure 3 shows a waveform of a single sound burst 7 on an axis of amplitude in dB against time in seconds. It crosses the first amplitude threshold a of the audio monitor within the slave or master unit, but not the second amplitude/time threshold b. No alarm is generated.
Figure 4 shows a waveform of several sound bursts 8 on an axis of amplitude in dB against time in seconds. They cross both the first amplitude threshold a and second amplitude/time threshold b of the audio monitor within the slave or master unit, triggering an alarm.
Audio is monitored using a microphone in combination with an electronic timer. When audio is detected above the adjustable level a, the timer is started. A time window is created (finishing at variable point b) whereby if the threshold is additionally crossed a set number of times, a flag generates the trigger for an alarm to be communicated by the system.
Figure 5 shows a waveform of a single vibration 9 on an axis of amplitude in dB against time in seconds. It crosses the first amplitude threshold c of the vibration monitor within the slave or master unit, but not the second amplitude/time threshold d. No alarm is generated.
Figure 6 shows a waveform of several vibrations 10 on an axis of amplitude in dB against time in seconds. They cross both the first amplitude threshold c and second amplitude/time threshold d of the vibration monitor within the slave or master unit, triggering an alarm.
Vibration is monitored using a tilt mechanism in combination with an electronic timer.
When vibration is detected above the adjustable level c, the timer is started. A time window is created (finishing at variable point d) whereby if the threshold is additionally crossed a set number of times, a flag generates the trigger for an alarm to be communicated by the system.
Claims (3)
- Claims 1. An intruder detection system for access hatches comprising acommunications antenna design that electro magnetically couples radio frequency power to a metal hatch via a strong magnet.
- 2. An intruder detection system for access hatches according to claim 1, in which a hardware and software audio sensing algorithm is used to verity attack by drilling, cutting or grinding of a hatch frame or cover.
- 3. An intruder detection system for access hatches according to claim 1, in which a hardware and software vibration sensing algorithm is used to verify attack by hammering on a hatch frame or cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0512065A GB2415536B (en) | 2005-06-14 | 2005-06-14 | Intruder detection system for access hatches |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0512065A GB2415536B (en) | 2005-06-14 | 2005-06-14 | Intruder detection system for access hatches |
Publications (4)
| Publication Number | Publication Date |
|---|---|
| GB0512065D0 GB0512065D0 (en) | 2005-07-20 |
| GB2415536A true GB2415536A (en) | 2005-12-28 |
| GB2415536A8 GB2415536A8 (en) | 2006-01-19 |
| GB2415536B GB2415536B (en) | 2006-05-10 |
Family
ID=34855490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0512065A Active GB2415536B (en) | 2005-06-14 | 2005-06-14 | Intruder detection system for access hatches |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2415536B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438897A (en) * | 2006-06-05 | 2007-12-12 | Ozonelink Ltd | Antenna for use on an access hatch |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001090096A (en) * | 1999-09-21 | 2001-04-03 | Hitachi Zosen Corp | Manhole cover apparatus |
| EP1282093A1 (en) * | 2001-08-01 | 2003-02-05 | WIKON Kommunikationstechnik GmbH | System for telemonitoring of manholes, especially of manholes of a long-distance heating network |
| WO2004100095A2 (en) * | 2003-05-03 | 2004-11-18 | Woven Electronics Corporation, A South Carolina Corporation | Fiber optic security system for sensing the intrusion of secured locations |
-
2005
- 2005-06-14 GB GB0512065A patent/GB2415536B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001090096A (en) * | 1999-09-21 | 2001-04-03 | Hitachi Zosen Corp | Manhole cover apparatus |
| EP1282093A1 (en) * | 2001-08-01 | 2003-02-05 | WIKON Kommunikationstechnik GmbH | System for telemonitoring of manholes, especially of manholes of a long-distance heating network |
| WO2004100095A2 (en) * | 2003-05-03 | 2004-11-18 | Woven Electronics Corporation, A South Carolina Corporation | Fiber optic security system for sensing the intrusion of secured locations |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2438897A (en) * | 2006-06-05 | 2007-12-12 | Ozonelink Ltd | Antenna for use on an access hatch |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0512065D0 (en) | 2005-07-20 |
| GB2415536A8 (en) | 2006-01-19 |
| GB2415536B (en) | 2006-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20091126 AND 20091202 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20120614 |
|
| S28 | Restoration of ceased patents (sect. 28/pat. act 1977) |
Free format text: APPLICATION FILED |
|
| S28 | Restoration of ceased patents (sect. 28/pat. act 1977) |
Free format text: RESTORATION ALLOWED Effective date: 20130424 |
|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20230614 |
|
| S28 | Restoration of ceased patents (sect. 28/pat. act 1977) |
Free format text: APPLICATION FILED |
|
| S28 | Restoration of ceased patents (sect. 28/pat. act 1977) |
Free format text: RESTORATION ALLOWED Effective date: 20240322 |