EP0919970A1 - Anordnung zum Absorbieren und/oder Zerstreuen von Störlicht in einem optischen Bewegungsmelder - Google Patents

Anordnung zum Absorbieren und/oder Zerstreuen von Störlicht in einem optischen Bewegungsmelder Download PDF

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Publication number
EP0919970A1
EP0919970A1 EP98304694A EP98304694A EP0919970A1 EP 0919970 A1 EP0919970 A1 EP 0919970A1 EP 98304694 A EP98304694 A EP 98304694A EP 98304694 A EP98304694 A EP 98304694A EP 0919970 A1 EP0919970 A1 EP 0919970A1
Authority
EP
European Patent Office
Prior art keywords
radiation
detector
sensing system
superfluous
compound lens
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
Application number
EP98304694A
Other languages
English (en)
French (fr)
Other versions
EP0919970B1 (de
Inventor
David I. Mckenney
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honeywell Inc
Original Assignee
C&K Systems Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US09/047,425 external-priority patent/US6121876A/en
Application filed by C&K Systems Inc filed Critical C&K Systems Inc
Publication of EP0919970A1 publication Critical patent/EP0919970A1/de
Application granted granted Critical
Publication of EP0919970B1 publication Critical patent/EP0919970B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL 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

Definitions

  • This invention relates generally to an infrared incrusion sensing system and in particular to a method and apparatus for restricting superfluous radiation not focused on a detector.
  • An infrared intrusion sensing system comprises a lens having a plurality of lines of focus for focusing infrared radiation that enters the system onto a detector.
  • An enclosure surrounding the detector provides isolation from insect entry.
  • the enclosure envelope is a protective volume of space for the optical path between the lens and the detector. Radiation focused by the lens in locations other than the detector is "superfluous" and is considered a source of false intrusion sensing by internal re-reflection inside the insect exclusion envelope. Elimination of superfluous radiation reaching the detector results in improved performance of the infrared intrusion sensing system and minimizes false alarms.
  • U.S. Patent No. 5,424,718 issued January 13, 1995 to Kurt Mühler et al. describes an IR intrusion detector using scattering to prevent false alarms by radiation outside the useful radiation band.
  • Focusing mirrors are provided with a rough surface for infrared selectivity. In the wavelength range from 6 to 15 micrometers, the infrared radiation is specularly reflected and focused in accordance with the shape of the mirrors. Extraneous radiation in the visible and near-infrared range from about 0.4 micrometer or less up to 3 micrometers is diffusely scattered. However, there is no scattering of extraneous infrared radiation to prevent such radiation from being detected.
  • an intrusion sensing system comprising a front assembly having a compound lens for focusing radiation, a circuit board including a radiation detector for sensing the radiation and circuitry for processing the detected radiation, a rear assembly for mating with the front assembly and enclosing the circuit board within the front assembly and the rear assembly, and the front assembly comprises means attached to the compound lens for excluding insects from the radiation detector and preventing superfluous radiation from reaching the radiation detector.
  • the insect excluding means comprises an opening on a first end adjacent to the compound lens for receiving the focused radiation and an opening on a second end which is smaller than the opening on the first end for accepting the radiation detector extending therethrough from the adjacent circuit board.
  • the insect excluding means comprises a pigmentation for absorbing the superfluous radiation, a textured surface for scattering superfluous radiation, and/or a contoured surface for preventing the superfluous radiation from reflecting onto the radiation detector.
  • the front assembly comprises another window on a bottom end of the front assembly for receiving radiation, and the radiation entering the sensing system through the bottom end window strikes mirrors above the detector for reflecting the radiation onto the radiation detector.
  • the pigmentation provides a black color to the insect excluding means.
  • the textured surface comprises repetitive, random deviations from a normal smooth surface to form a three-dimensional topography on the surface.
  • the contoured surface comprises peaks and valleys for causing lossy reflections of the superfluous radiation within the valleys.
  • an intrusion sensing system comprising a front assembly having a compound lens for focusing radiation, a circuit board including a radiation detector positioned opposite the compound lens for sensing the radiation and circuitry for processing the detected radiation, a rear assembly for mating with the front assembly and enclosing the circuit board within the front assembly and the rear assembly, the front assembly comprises means attached to the compound lens for excluding insects from the radiation detector, and the front assembly further comprises means inserted within the insect excluding means for suppressing superfluous radiation.
  • the insect excluding means and the suppressing means comprises an opening on a first end adjacent to the compound lens for receiving the focused radiation and an opening on a second end which is smaller than the opening on the first end for accepting the radiation detector extending therethrough from the adjacent circuit board.
  • the suppressing means comprises a pigmentation for absorbing the superfluous radiation.
  • the insert suppressing means may comprise a textured surface for scattering superfluous radiation or a contoured surface for preventing the superfluous radiation from reflecting onto the radiation detector.
  • the front assembly comprises another window on a bottom end of the front assembly for receiving radiation, and the radiation entering the sensing system through the bottom end window strikes mirrors above the detector for reflecting the radiation onto the radiation detector.
  • an intrusion sensing system comprising a front assembly having a compound lens for focusing radiation, a circuit board including a radiation detector for sensing the radiation and circuitry for processing the detected radiation, a baffle having a first open end attached around the perimeter of the radiation detector and a second open end facing the compound lens for suppressing superfluous radiation, and a rear assembly for sealably mating with the front assembly and enclosing the circuit board within the front assembly and the rear assembly thereby excluding insects from entering the sensing system.
  • the baffle comprises an opening on a second end in front of the compound lens for receiving the focused radiation and an opening on a first end which is smaller than the opening on the second end for accepting the radiation detector extending therethrough from the adjacent circuit board.
  • the baffle comprises a pigmentation for absorbing the superfluous radiation.
  • the baffle may comprise a textured surface for scattering superfluous radiation, or a contoured surface for preventing the superfluous radiation from reflecting onto the radiation detector.
  • the front assembly comprises another window on a bottom end of the front assembly for receiving radiation, and the radiation entering the sensing system through the bottom end window strikes mirrors above the detector for reflecting the radiation onto the radiation detector.
  • a method of suppressing superfluous radiation in an intrusion sensing system comprising the steps of providing a front assembly having a compound lens for focusing radiation, sensing the radiation with a detector positioned on a circuit board including circuitry coupled to the detector for processing the sensed radiation, enclosing the intrusion sensing system with a rear assembly which is disposed adjacent to one side of the circuit board and joined together at the periphery of the front assembly, and providing a suppressing means within the front assembly for preventing superfluous radiation from reaching the detector and suppressing means attached to the compound lens prevents insects from entering the space envelope cf the suppressing means within the system.
  • the method comprises the step of adding a pigmentation to the material of the suppressing means for absorbing the superfluous radiation.
  • the method also comprises the step of providing a textured surface on the suppressing means for scattering superfluous radiation.
  • the method also comprises the step of providing a contoured surface on the suppressing means for preventing superfluous radiation from reflecting onto the radiation detector.
  • the step of providing a contoured surface on the suppressing means comprises the step of providing peaks and valleys for causing lossy reflections of the superfluous radiation within the valleys.
  • a method of suppressing radiation in an intrusion sensing system comprising the steps of providing a front assembly having a compound lens for focusing radiation, sensing the radiation with a detector positioned on a circuit board including circuitry coupled to the detector for processing the sensed radiation, enclosing the intrusion sensing system with a rear assembly which is disposed adjacent to one side of the circuit board and joined together at the periphery of the front assembly, excluding insects from the radiation detector with enclosure means attached to the compound lens and positioned within the front assembly, and inserting within the enclosure means for suppressing superfluous radiation.
  • the suppressing means includes the use of a pigmentation on the walls of the enclosure means, a textured surface or/and a contoured surface on such walls.
  • FIG. 1 an exploded perspective view of a front assembly 10 of an intrusion sensing system 11 is shown which incorporates the invention of an insect exclusion enclosure 12 comprising means for absorbing or scattering superfluous radiation that is not focused on a detector 26.
  • the insert exclusion enclosure 12 further provides a protected volume of space for optical paths between lenses 14, window 18 and a radiation detector 26 by preventing the entry of objects approximately 1 mm in diameter or larger which could interfere with the optical paths. Reducing superfluous radiation results in improved operating performance by minimizing false alarms for such an intrusion sensing system.
  • a compound lens 14 attaches to the front of the insect exclusion enclosure 12 and has a plurality of lines of focus for focusing infrared radiation that enters the system onto the detector 26.
  • the detector 26 is located near the focal point of the compound lens 14 and the curvilinear-shaped mirror 24.
  • a window enclosure 18 provides for another source of radiation to reach the detector in addition to the compound lens 14.
  • a front housing 16 encloses the compound lens 14 and the insect exclusion enclosure 12.
  • FIG. 2 an exploded perspective view of a rear assembly 20 of the intrusion sensing system 11 is shown.
  • a circuit board 22 having an infrared detector 26, a curvilinear-shaped mirror 24 positioned above the infrared detector 26 for reflecting radiation onto the detector 26, insect exclusion enclosure gasket 28 that fits around the perimeter of the detector 26 for interfacing with one end cf the insect exclusion enclosure 12, and other circuits, is placed in the front assembly 16 and the rear assembly 20 mates with the front assembly 16 and they snap together.
  • openings in the rear assembly 20 for mounting purposes which also provides a means of entry for insects.
  • FIG. 3 shows a perspective view of the insect exclusion enclosure 12 having a wide front opening 30 that is adjacent to the compound lens 14 and the smaller opening 32 of the back 32 into which the curvilinear-shaped mirror 24 and infrared detector 26 protrude in the assembled system.
  • FIG. 4 is a front elevational view of the insect exclusion enclosure 12 showing side walls 31 and the smaller opening 32 at the back of the enclosure 12.
  • FIG. 5 a cross-sectional view of the insect exclusion enclosure 12, compound lens 14 and infrared detector 26 is shown and an example superfluous radiation path 34 when the insect exclusion enclosure 12 does not comprise pigmentation, texturing and/or contouring. Also shown is a path 36 for beneficial or non-superfluous radiation which arrives directly at the infrared detector 26. The superfluous radiation path 34 arrives at the infrared detector 26 after repeated reflection inside the insect exclusion enclosure 12.
  • FIG. 6 a cross-sectional view is shown of the insect exclusion enclosure 12 comprising pigmentation 40 added to the material forming the insect exclusion envelope.
  • a superfluous radiation path 38 is illustrated being absorbed by a side 41 of the insect exclusion enclosure 12.
  • the pigmentation 40 most effectively produces a black insect exclusion enclosure 12.
  • the material used to injection mold the insect exclusion enclosure 12 is a polycarbonate plastic which may be embodied by Lexan 141 manufactured by General Electric Co., of Pittsfield, Massachusetts.
  • the pigment used with the Lexan 141 comprises 0.2% carbon black of 24 nm particle size.
  • FIG. 7 illustrates a cross-sectional view of the insect exclusion enclosure 12 comprising a textured surface 42.
  • An example superfluous radiation path 44 strikes the textured surface 42 of the insect exclusion enclosure 12 and is scattered, so that it does not reflect and impinge upon the infrared detector 26.
  • Surface texturing is defined as the repetitive or random deviations from the normal surface which form a three
  • FIG. 8A shows a typical textured surface.
  • FIG. 8B is a perspective view cf a portion of the textured surface of the insect exclusion enclosure 12.
  • FIG. 8C shows an enlarged cross-sectional view of the textured surface of FIGS. 8A and 8B having a texture length spacing 43 of 0.008 inches and a texture height 45 of 0.003 inches.
  • FIG. 9 a cross-sectional view is illustrated of the insect exclusion enclosure 12 comprising contouring on the surfaces of its inner walls.
  • a superfluous radiation path 48 is illustrated being attenuated by multiple lossy reflections by the sides 46 of the insect exclusion enclosure 12 by providing the contours 47 on the inner walls of the enclosure 12.
  • Surface contouring 47 supersedes surface texturing as shown in FIGS. 8A and 8C when the texturing height exceeds the length of the traversing run. These dimensions cause repeated reflections within the valleys of the contouring as shown in FIG. 9, constituting repeated lossy reflections.
  • FIG. 10A shows an exploded perspective view of an alternate embodiment of an intrusion sensing systems 50 comprising the rear assembly 20, circuit board 22 having mounted thereon the infrared detector 26 with a curvilinear-shaped mirror 24 mounted adjacent to and above the infrared detector 26, and a front assembly 16.
  • FIG. 10A shows an exploded perspective view of the complete sensing system 50 comprising the rear assembly 20, circuit board 22 having mounted thereon the infrared detector 26 with a curvilinear-shaped mirror 24 mounted adjacent to and above the infrared detector 26, and a front assembly 16.
  • FIG. 10B shows an exploded perspective view of the front assembly 15 comprising a front housing 16, an insect exclusion enclosure 12, a pigmented textured and/or contoured insert 52 having the general shape of the insect exclusion enclosure 12 which is placed inside the insect exclusion enclosure and the compound lens 14 which is attached to the insect exclusion enclosure 12 by engaging the lens tabs 17 over hooks 13 on the insect exclusion enclosure 12.
  • a window 18 is slid onto the bottom of the insect exclusion enclosure 12.
  • the insect exclusion enclosure 12 with the compound lens 14 and window 18 attached thereto and comprising the insert 52 snaps onto the rear of the front housing 16.
  • the front assembly 15 then snaps into the rear assembly 20 and the insect exclusion enclosure 12 contacts the circuit board 22 via the insect exclusion enclosure gasket 28.
  • This embodiment of the intrusion sensing system 50 comprises the benefits of absorbing and/or scattering of superfluous radiation by the insertion of the insert 52 into an existing intrusion sensing system.
  • FIG. 11A shows an exploded perspective view of another alternate embodiment of an intrusion system 60 comprising a rear housing 62, a circuit board 64, a superfluous radiation absorber or baffle 67 that has been pigmented, textured and/or contoured as previously described which is attached to the circuit board 64.
  • the circuit board 64 is attached to the rear housing 62 and a front assembly 68 snaps together with the rear housing 62 sealing the system 60 against insect entry.
  • the front assembly 68 comprises a compound lens 72 attached to the front housing 70 by means of appropriate latches 76 on the front housing 70.
  • a window 74 is attached to the bottom of the front housing 70 by appropriate snap latches 77.
  • This embodiment provides an intrusion sensing system 60 in which the superfluous radiation absorber does not contact the front housing 70.
  • the sensing system 60 is assembled the rear housing 62 is mated with the front housing 68 and there are no openings for bug access to the inside. Also, there are no mounting holes that otherwise allow bug entry.
  • the baffle 67 which is pigmented, textured and/or contoured to absorb or scatter superfluous radiation, is attached to the circuit board 64 around the perimeter of the infrared detector 65.
  • the sensor system 60 When the sensor system 60 is used in an application, it may be mounted, for example, with tape means on the rear of housing 62.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Catching Or Destruction (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
EP19980304694 1997-11-25 1998-06-15 Anordnung zum Absorbieren und/oder Zerstreuen von Störlicht in einem optischen Bewegungsmelder Expired - Lifetime EP0919970B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US47425 1979-06-11
US6629097P 1997-11-25 1997-11-25
US66290P 1997-11-25
US09/047,425 US6121876A (en) 1998-03-24 1998-03-24 System for absorbing and or scattering superfluous radiation in an optical motion sensor

Publications (2)

Publication Number Publication Date
EP0919970A1 true EP0919970A1 (de) 1999-06-02
EP0919970B1 EP0919970B1 (de) 2003-12-17

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ID=26725003

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Application Number Title Priority Date Filing Date
EP19980304694 Expired - Lifetime EP0919970B1 (de) 1997-11-25 1998-06-15 Anordnung zum Absorbieren und/oder Zerstreuen von Störlicht in einem optischen Bewegungsmelder

Country Status (6)

Country Link
EP (1) EP0919970B1 (de)
JP (1) JPH11232564A (de)
CN (1) CN1161725C (de)
AU (1) AU744055B2 (de)
CA (1) CA2236813C (de)
DE (1) DE69820573T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000038125A1 (en) * 1998-12-22 2000-06-29 Pyronix Limited Intruder sensor housing and intruder sensor
WO2018113255A1 (en) 2016-12-23 2018-06-28 Zhejiang Shenghui Lighting Co., Ltd. A sensor light and a system for preventing false triggering of a sensor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100635843B1 (ko) * 2000-03-16 2006-10-18 오프텍스 가부시키가이샤 침입검지용 센서
US8232883B2 (en) * 2009-12-04 2012-07-31 Avago Technologies Ecbu Ip (Singapore) Pte. Ltd. Optical proximity sensor with improved shield and lenses
CN106289536A (zh) * 2016-10-26 2017-01-04 中国科学院云南天文台 一种用于光学镜面的红外测温装置
JP7155504B2 (ja) * 2017-10-20 2022-10-19 大日本印刷株式会社 検知システム、波長選択素子
CN114333197A (zh) * 2021-12-30 2022-04-12 杭州海康威视数字技术股份有限公司 入侵探测器及入侵探测器的安装方法

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US4268347A (en) * 1979-01-26 1981-05-19 Exxon Research & Engineering Co. Low reflectivity surface formed by particle track etching
US4271358A (en) * 1979-11-13 1981-06-02 Frank Schwarz Selective infrared detector
EP0105199A1 (de) * 1982-09-08 1984-04-11 Heimann GmbH Strahlungsrauchmelder
EP0135361A2 (de) * 1983-08-12 1985-03-27 I.E.I. Pty Ltd A.C.N. 053 531 212 Gerät zur Detektion von Partikeln in Suspension
JPS60185920A (ja) * 1984-03-05 1985-09-21 Matsushita Electric Ind Co Ltd 撮像装置
GB2186972A (en) * 1986-02-25 1987-08-26 Matsushita Electric Works Ltd Infrared detector
EP0617389A1 (de) * 1993-03-26 1994-09-28 Cerberus Ag Intrusionsmelder
DE19628050A1 (de) * 1995-07-13 1997-01-16 Lg Electronics Inc Infrarotmeßvorrichtung und Verfahren der Erfassung eines menschlichen Körpers durch diese
JPH09304175A (ja) * 1996-05-20 1997-11-28 Atsumi Electron Corp Ltd ビームセンサ

Family Cites Families (2)

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NL9200283A (nl) * 1992-02-17 1993-09-16 Aritech Bv Bewakingssysteem.
US5790040A (en) * 1996-12-13 1998-08-04 Interactive Technologies, Inc. Battery-operated security system sensors

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4268347A (en) * 1979-01-26 1981-05-19 Exxon Research & Engineering Co. Low reflectivity surface formed by particle track etching
US4271358A (en) * 1979-11-13 1981-06-02 Frank Schwarz Selective infrared detector
EP0105199A1 (de) * 1982-09-08 1984-04-11 Heimann GmbH Strahlungsrauchmelder
EP0135361A2 (de) * 1983-08-12 1985-03-27 I.E.I. Pty Ltd A.C.N. 053 531 212 Gerät zur Detektion von Partikeln in Suspension
JPS60185920A (ja) * 1984-03-05 1985-09-21 Matsushita Electric Ind Co Ltd 撮像装置
GB2186972A (en) * 1986-02-25 1987-08-26 Matsushita Electric Works Ltd Infrared detector
EP0617389A1 (de) * 1993-03-26 1994-09-28 Cerberus Ag Intrusionsmelder
US5424718A (en) * 1993-03-26 1995-06-13 Cerburus Ag. IR intrusion detector using scattering to prevent false alarms
DE19628050A1 (de) * 1995-07-13 1997-01-16 Lg Electronics Inc Infrarotmeßvorrichtung und Verfahren der Erfassung eines menschlichen Körpers durch diese
JPH09304175A (ja) * 1996-05-20 1997-11-28 Atsumi Electron Corp Ltd ビームセンサ

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PATENT ABSTRACTS OF JAPAN vol. 010, no. 038 (P - 428) 14 February 1986 (1986-02-14) *
PATENT ABSTRACTS OF JAPAN vol. 098, no. 003 27 February 1998 (1998-02-27) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000038125A1 (en) * 1998-12-22 2000-06-29 Pyronix Limited Intruder sensor housing and intruder sensor
WO2018113255A1 (en) 2016-12-23 2018-06-28 Zhejiang Shenghui Lighting Co., Ltd. A sensor light and a system for preventing false triggering of a sensor

Also Published As

Publication number Publication date
AU7311498A (en) 1999-06-17
JPH11232564A (ja) 1999-08-27
CA2236813A1 (en) 1999-05-25
AU744055B2 (en) 2002-02-14
EP0919970B1 (de) 2003-12-17
DE69820573T2 (de) 2004-09-30
DE69820573D1 (de) 2004-01-29
CN1218242A (zh) 1999-06-02
CA2236813C (en) 2005-12-27
CN1161725C (zh) 2004-08-11

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