EP1264292A1 - Pet resistant pir detector - Google Patents
Pet resistant pir detectorInfo
- Publication number
- EP1264292A1 EP1264292A1 EP01914858A EP01914858A EP1264292A1 EP 1264292 A1 EP1264292 A1 EP 1264292A1 EP 01914858 A EP01914858 A EP 01914858A EP 01914858 A EP01914858 A EP 01914858A EP 1264292 A1 EP1264292 A1 EP 1264292A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- focussing
- detector
- tier
- passive infrared
- close
- 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 claims abstract description 17
- 230000005855 radiation Effects 0.000 claims description 29
- 238000012545 processing Methods 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 4
- 241000282326 Felis catus Species 0.000 abstract description 9
- 238000013459 approach Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 241000282412 Homo Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000000926 separation method Methods 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
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
- G08B13/193—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using focusing means
-
- 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
- G08B29/18—Prevention or correction of operating errors
- G08B29/183—Single detectors using dual technologies
Definitions
- the present application relates to passive infrared motion detection sensors and in particular, relates to a sensor which has improved features with respect to false alarms caused by small pets.
- Passive infrared detectors focus radiation from an area to be monitored in a particular manner such that movement of a human intruder through the monitored space is detected.
- a Fresnel focussing arrangement (lens or mirror) focuses infrared radiation emitted by a human or pet target onto a passive infrared detector.
- the Fresnel lens has multiple lensets and each lenset includes a focussing element defining an infrared beam that collectively covers the protected area . These beams increase in size as an increasing function of proportional to the distance from the detector.
- This characteristic of the Fresnel lens makes it difficult to distinguish between small pets located in a region close to the detector from a human target located at a substantial distance from the detector. In the closer region to the detector, the beams are quite small, and as such, a small pet will produce a signal similar in level to a person a substantial distance away from the detector.
- a passive infrared motion sensor comprises a passive infrared detector, a Fresnel focussing arrangement in front of the detector for selective focussing of infrared radiation from an area to be monitored, and directing such radiation onto the detector and processing such circuitry for analyzing the signal from the detector and making a determination whether an intruder is present.
- the Fresnel focussing arrangement is divided into at least two tiers comprising a first tier and a second tier.
- the first tier focusses radiation from a distant subdivision of the area being monitored and the second tier focusses radiation from a close subdivision of the area being monitored.
- the second tier divides the close subdivision into narrow elongated vertically disposed sensing strips such that a pet in the close subdivision causes the detector to produce a signal less than 80% of the signal used to indicate the presence of an intruder in the close subdivision or the distant subdivision.
- the Fresnel focussing arrangement can either be a mirror arrangement or a lens arrangement.
- a Fresnel lens is used, comprising a number of stacked lensets of a Fresnel lens with the result being an elongation of the area which is capable of receiving radiation focussing the same on the detector.
- the lensets stacked one on top of the other provides a series of vertical focal points in contrast to the prior practice of a single focal point.
- the Fresnel focussing arrangement is divided into at least three horizontal tiers comprising an upper distant tier, an intermediate tier and a close tier, with each tier having a series of horizontally spaced focussing facets.
- Each focussing facet of the close and the intermediate tiers are segmented to vertically elongate and shape a detection region of the facet such that the passive infrared radiation received due to a small pet in the detection region is easily distinguished from passive infrared radiation received due to an intruder in the detection region.
- Figure 8 shows the typical signal produced by a human target in the monitored space and by a animal target in a monitored space.
- the passive infrared motion sensor 2 comprises a single element detector 4, a Fresnel focussing arrangement 6, and in this case a lens which focusses the infrared radiation 20 from the space being monitored 22 onto the detector.
- the signal from the single element detector 4 is fed to the signal conditioning and amplification block 3 with the conditioned signal being provided to the microprocessor 10.
- the microprocessor 10 determines the strength of the signal received at any point in time and based thereon, determines alarm conditions.
- the signal that is generated by a small pet is normally significantly lower in amplitude than a human and can be screened by an appropriate algorithm.
- the Fresnel lens arrangement which are used in prior art passive infrared motion sensors have the characteristic that the size of the active area from which radiation is focussed increases as a function of the separation distance from the detector.
- the distant zone 44 has an active area generally indicated as 26 and this area can be sized to allow the radiation from a human to effectively be recognized by the sensor.
- a small pet 21 in the active area 26 does not produce a signal of sufficient magnitude to indicate an alarm condition.
- the active area 30 is smaller in size as the distance from the detector has decreased.
- the pet does not occupy all of the active area 30 and the active area 30 will cover a large portion of a human intruder, and as such, a pet and a human can be distinguished.
- FIG. 3 shows the results of a modified Fresnel lens arrangement where the active areas of the sensor in a region close to the sensor have been vertically elongated and reduced in width.
- the vertical elongation 50 shows a number of segments 52 which increase in size vertically. With this vertical shaping of the active zone, the lower most segment 52 again is dominated by a small pet when the pet crosses that zone, however, the magnitude of that signal has been reduced and the amount of radiation received by the detector has been reduced by the extent that the zone has been vertically elongated due to the stack of the focussing segments 52.
- a human intruder relative to the active zone 60 will produce a signal that is very similar to an intruder passing through the active zone 50 as he approaches the detector.
- the signal from the pet in zone 50 will be in proportion and will certainly not exceed the signal produced by a human at 60.
- This vertical elongation of the active zones close to the sensor is particularly advantageous as the single element detector 4 can be used and a small pet easily distinguished.
- Tier 1 shows the vertical stacked focal points 67 of each lens sublet and in this case, five stacks of focal points 67 are shown.
- the second tier - 62 again has a modified series of lensets having focal points 69 which are again vertically stacked. These focal points 69 are offset relative to the focal points 67 and cooperate with tier 1 to define the close region. They require a second tier due to the different structures of tier 1 and 2 which will be explained with reference to Figures 6 through 8.
- Tier 3 also has a series of stacked focal points 71 and these are used for the intermediate region.
- the region 66 is for the distant region and is of a conventional design.
- This elongation or shaping technique is also able to distinguish two pets in close proximity to the sensor.
- the signal produced by a small pet such as a cat is less than about 40% of two cats in close proximity to the sensor will only produce a signal at about 80% of the magnitude necessary to indicate an intruder.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Burglar Alarm Systems (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA 2300644 CA2300644C (en) | 2000-03-10 | 2000-03-10 | Pet resistant pir detector |
CA2300644 | 2000-03-10 | ||
PCT/CA2001/000284 WO2001067414A1 (en) | 2000-03-10 | 2001-03-08 | Pet resistant pir detector |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1264292A1 true EP1264292A1 (en) | 2002-12-11 |
EP1264292B1 EP1264292B1 (en) | 2009-11-11 |
Family
ID=4165508
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01914858A Expired - Lifetime EP1264292B1 (en) | 2000-03-10 | 2001-03-08 | Pet resistant pir detector |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1264292B1 (en) |
AU (2) | AU2001242129B2 (en) |
BR (1) | BRPI0109092B1 (en) |
CA (1) | CA2300644C (en) |
DE (1) | DE60140432D1 (en) |
WO (1) | WO2001067414A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018163068A1 (en) * | 2017-03-06 | 2018-09-13 | Tyco Fire & Security Gmbh | Passive infra-red intrusion detector |
US11080974B2 (en) | 2013-12-13 | 2021-08-03 | Utc Fire & Security Americas Corporation, Inc. | Selective intrusion detection systems |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2402532B (en) * | 2004-04-15 | 2005-06-01 | Mark Anthony Wheatley | Sensor cover |
EP2390851B1 (en) | 2010-05-27 | 2013-02-20 | Nxp B.V. | Presence Detection System and Method |
CN102279426B (en) * | 2011-05-25 | 2013-06-19 | 深圳市豪恩安全科技有限公司 | Fresnel lens, passive infrared detector and security system |
GB2507818B (en) | 2012-11-13 | 2015-09-09 | Pyronix Ltd | Infrared detection device and masking section |
FI124949B (en) * | 2014-01-03 | 2015-04-15 | Elsi Technologies Oy | Method and system of control |
EP3171346A3 (en) | 2015-11-23 | 2017-08-09 | Essence Security International Ltd. | Adjustable security sensing device |
US9733127B2 (en) | 2016-01-19 | 2017-08-15 | Google Inc. | System and method for estimating size and location of moving objects |
US9952349B1 (en) * | 2017-03-08 | 2018-04-24 | Tyco Fire & Security Gmbh | Human motion detection system |
DE102017106307A1 (en) * | 2017-03-23 | 2018-09-27 | Eq-3 Holding Gmbh | Device and method for direction detection in passes |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4734585A (en) * | 1985-07-17 | 1988-03-29 | Racal-Guardall (Scotland) Ltd. | Passive infra-red sensor |
DE3666887D1 (en) * | 1985-09-02 | 1989-12-14 | Heimann Gmbh | Infrared movement detector |
JPS62121523U (en) | 1986-01-24 | 1987-08-01 | ||
CH676642A5 (en) * | 1988-09-22 | 1991-02-15 | Cerberus Ag | |
CH681574A5 (en) * | 1991-03-01 | 1993-04-15 | Cerberus Ag |
-
2000
- 2000-03-10 CA CA 2300644 patent/CA2300644C/en not_active Expired - Lifetime
-
2001
- 2001-03-08 AU AU2001242129A patent/AU2001242129B2/en not_active Expired
- 2001-03-08 WO PCT/CA2001/000284 patent/WO2001067414A1/en active IP Right Grant
- 2001-03-08 DE DE60140432T patent/DE60140432D1/en not_active Expired - Lifetime
- 2001-03-08 BR BRPI0109092-5A patent/BRPI0109092B1/en not_active IP Right Cessation
- 2001-03-08 AU AU4212901A patent/AU4212901A/en active Pending
- 2001-03-08 EP EP01914858A patent/EP1264292B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0167414A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11080974B2 (en) | 2013-12-13 | 2021-08-03 | Utc Fire & Security Americas Corporation, Inc. | Selective intrusion detection systems |
US11776368B2 (en) | 2013-12-13 | 2023-10-03 | Utc Fire & Security Americas Corporation, Inc. | Selective intrusion detection systems |
WO2018163068A1 (en) * | 2017-03-06 | 2018-09-13 | Tyco Fire & Security Gmbh | Passive infra-red intrusion detector |
Also Published As
Publication number | Publication date |
---|---|
BRPI0109092B1 (en) | 2015-09-01 |
EP1264292B1 (en) | 2009-11-11 |
AU4212901A (en) | 2001-09-17 |
CA2300644C (en) | 2009-07-14 |
WO2001067414A1 (en) | 2001-09-13 |
CA2300644A1 (en) | 2001-09-10 |
AU2001242129B2 (en) | 2005-01-20 |
DE60140432D1 (en) | 2009-12-24 |
BR0109092A (en) | 2003-06-03 |
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