EP0021630A2 - Détecteur d'intrusion à infrarouges et système optique pour un tel détecteur - Google Patents

Détecteur d'intrusion à infrarouges et système optique pour un tel détecteur Download PDF

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Publication number
EP0021630A2
EP0021630A2 EP80301819A EP80301819A EP0021630A2 EP 0021630 A2 EP0021630 A2 EP 0021630A2 EP 80301819 A EP80301819 A EP 80301819A EP 80301819 A EP80301819 A EP 80301819A EP 0021630 A2 EP0021630 A2 EP 0021630A2
Authority
EP
European Patent Office
Prior art keywords
radiation
infrared
mirror
discrete
onto
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.)
Ceased
Application number
EP80301819A
Other languages
German (de)
English (en)
Other versions
EP0021630A3 (fr
Inventor
Zbigniew W. Turlej
Donald Frederick Hawken
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.)
Isotec Industries Ltd
Original Assignee
Isotec Industries Ltd
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
Application filed by Isotec Industries Ltd filed Critical Isotec Industries Ltd
Publication of EP0021630A2 publication Critical patent/EP0021630A2/fr
Publication of EP0021630A3 publication Critical patent/EP0021630A3/fr
Ceased legal-status Critical Current

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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
    • G08B13/18—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 to infrared intrusion detectors and more particularly to optical systems for such detectors.
  • a similar type of mirror arrangement in terms of segmenting the curved mirror portion of the reflector arrangement is shown in United States patent 3,886,360.
  • the mirror arrangement requires three reflections before the radiation is concentrated onto the infrared radiation sensor.
  • multi-faceted mirrors for use in infrared radiation detectol 4 s are disclosed in United States patents 3,923,382 and 3,972,598.
  • the purpose of the multi-faceted curved mirror is to gather radiation from several spaced-apart discrete fields of view and focus the radiation onto a single sensing element.
  • a concave mirror is used to directly reflect gathered radiation from a field of detection onto a detector which has an array of detection points to establish movement of the intruder across the.field of detection.
  • the advantages of this invention are realized in an optical system for gathering infrared radiation from several discrete, spaced-apart sensitive regions and focusing it onto an infrared radiation sensor.
  • the system comprises an optical collector for gathering infrared radiation from a space including such sensitive regions and for converging such radiation onto a plurality of reflectors.
  • Each reflector determines a discrete, sensitive region and, in turn, is oriented to reflect the converging radiation gathered from a corresponding discrete sensitive region onto an infrared radiation sensor.
  • the optical collector may be an optic lens or concavely curved mirror which converges the radiation onto an array of a plurality of reflectors.
  • the reflector may be a planar mirror, which in determining a sensitive region, reflects infrared radiation from that region onto a infrared radiation' sensor.
  • the compactness of the device is realized in the combined use of the optical collector/converger and plurality of reflectors, where the reflectors provide the discrete regions of sensitivity and the collectors determine the breadth of the field.
  • the use of reflectors permits positioning of the sensor intermediate the optical collector and reflectors.
  • An optical system 10 adapted for use with an infrared intrusion detector is shown in Figure 1.
  • An intruder 12 is shown in positions a and b which are sensitive or detection regions.
  • the infrared radiation emitted from the body of the intruder propagates towards the optic system 10 along paths generally designated 14a and 14b.
  • the optic system 10 includes an optical collector 16 which converges the received radiation along path 18a onto an array of optical reflectors 2(
  • the array of optical reflectors is, in this instance, made up of four planar mirrors 22, 24, 26 and 28. Each of the reflectors is oriented differently to an adjacent reflector. Reflector 24 determines the sensitive region where intruder 12a is and, in turn, is oriented to reflect along path 32a the converging radiation onto the infrared radiation detector 30.
  • an intruder emitting radiation along path 34c is focused onto the detector 30 by another optical collector 36 which converges the radiation onto the reflector array 20 along path 38c.
  • reflector 28 reflects the converging radiation along path 40c onto the sensor 30.
  • the sensor 30 may be of any type of suitable infrared sensor, such as pyro-electric, thermopile or thermistor type.
  • the radiation to be sensed in terms of intruders, varies roughly between 7 and 15 microns.
  • a human body emits infrared radiation peaked at a wavelength of approximately 9 microns.
  • the signal from the sensor 30 is electronically processed and monitored in a manner to cause an alarm when the intensity of the received radiation and the frequency or occurrence of the radiation level is such to correspond with that of an intruder.
  • the electronics in terms of sensing, are tuned to substantially reduce the generation of false alarms due to slow increases in radiation, such as room heating and the like. The electrical sensing of the radiation will be discussed in more detail with respect to the block diagram of Figure 7.
  • FIG 2 the paths of radiation, as collected and reflected by the optic system 10, are shown where the intruder 12b is in position and a new position for an intruder 12d is shown. Due to the particular positioning of.reflector 22, the infrared radiation from intruder 12b, as transmitted along a path 14b, is collected by curved mirror 16 and converged onto the reflecting surface 22. The focal point of mirror 16 is such that the reflected converging radiation along path 42b is focused onto the sensor portion 44 of detector 30.
  • the radius of curvature of the mirror 16 has been accentuated for purposes of illustration. It is appreciated, however, that the curvature of the mirror 16, should it be spherical, would have a radius equal to twice the summation of the distances from mirror 16 to the planar mirror 22 and from mirror 22 to detector surface 44. Thus, the focal point from the curved mirror 16 is proximate or exactly at receiver surface 44. As to intruder 12d, his radiation transmitted along path 46d is collected by mirror 36 and converged along path 48d onto mirror 26, which is arranged to reflect the converging radiation onto the receiver portion .44.
  • the arrangement for the optical system is such that in collecting and reflecting the radiation onto the sensor 30, in no way does the position of the sensor interfere with the transmission of the received and focused radiation.
  • the reflector array 20 is arranged such that it reflects the radiation slightly upwardly to converge on the sensor 30 as it is positioned somewhat above the array 20. This prevents the sensor 30 from interferring in any way with the radiation as converged onto the reflector by the gathering mirrors 16 and 36.
  • the mirror array 20 provides in a very simple manner a plurality of regions of detection, while relying on an easily constructed optic collector, such as spherical mirror or convex lens.
  • the system also provides for adjusting the optic collector position or angle to select a desired space of detection which contains the discrete spaced-apart sensitive regions.
  • the reflector array 20 also provides the aspect of a compact form of intrusion detector.
  • the collector optics would require positioning of the sensor at its focal point which would be equidistant on the other side of array 20. Therefore, the reflector permits a close inverted positioning of the detector relative to radiation optic collectors.
  • the detector may be positioned approximately midway between the reflector array and the radiation collectors.
  • the size of the discrete, spaced-apart sensitive regions is dependent upon thesshape of the receiving area 44 of the detector 30.
  • the shape of the detector opening 44 may be rectangular to provide at approximately 30 feet a sensitive or detector region of roughly one-half a foot wide by three- quarters of a foot high. In providing a higher than wider sensitive region, the detector is, therefore, less sensitive to vertical movement due to rising heat from a heater or the like.
  • the tilting of the reflector element of the array 20, and in combination with positioning of the radiation collectors, provides various areas for detection.
  • the radiation collection device generally designated 50, is ring-shaped and has on its inner surface an annular continuous concave reflector.
  • the collector 50 may collect radiation from fields or a field all-about the detector, regardless from where radiation enters.
  • the reflector array 52 determines which portions in that field are set up as sensitive regions, when the reflector array, in this instance, has four reflecting surfaces, 54, 56, 58 and 60, which divide the array into four quadrants, thus providing four sensitive regions which would be upper and lower and side-by-side.
  • radiation transmitted along a path.generaly designated 62 enters from the bottom area of the field and is collected at the base of the collector 50 and converged along path 64 onto planar reflector 60 which, in turn, reflects the converging beam 66 onto the receiving area 44 of detector 30.
  • sensitive areas may be established over several regions in a field to provide detection. All the regions are predetermined not by collector 50, but instead by the reflector array 52 which, in this instance, consists of planar mirrorsand may be set up easily in various attitudes to establish the necessary regions of sensitivity.
  • a section through the collector 50 shows where radiation, entering along path 68, is collected and converged onto reflector 58 and, in turn, focused on sensitive area 44 of detector 30.
  • radiation entering along path 70 is reflected by surface 54 and converged on the detector surface 44 in the manner shown.
  • the reflector array 52 for the system is shown in more detail. Radiation entering along the path 72, as collected by the collector, is reflected off the upper quadrant 60 and converges on to the detector 30. Similarly, radiation entering from another direction along path 74, as converged by the collector 50, is reflected off surface 54 onto the detector. It can be appreciated that, with the array 52, the quadrants may be broken up into smaller segments to establish further sensitive regions about the upper, lower and side-by-side areas and may approach a polygonal-shaped peripheral field of detection.
  • the radiation collectors are such that they are able to collect radiation from a very broad field, which includes, of course, all of the sensitive regions as determined by the reflector array.
  • a very broad field which includes, of course, all of the sensitive regions as determined by the reflector array.
  • optical collectors which employ a lens to concentrate or converge received radiation.
  • a pair of convex lenses 76, 78 converge received radiation along paths 80, 82 onto the reflector array 20 which has the individual elements 22, 24, 26 and 28.
  • lens 76 converges the radiation along path 84 onto mirror 28, which reflect it back to the sensitive area 44 of detector 30.
  • various electronic arrangements may be employed which are connected to the detector 30 and which ,sound an alarm, or cause an alarm, when the relative degree of radiation has reached a predetermined level.
  • the electronics may be such to sense movement through one or more of the sensitive regions.
  • FIG 7 a block diagram of the electronic components is shown.
  • the detector 30 has its generated signal transmitted to a.low noise differential amplifier 90 which amplifies the signal received from the detector 30.
  • the amplified signal is transmitted to the active filter 92 which filters the amplified signal to pass the specified frequency corresponding to that which would be generated by an intruder entering one or more of the sensitive regions.
  • the filtered signal is fed to the comparator 94 where the amplitude of the signal is compared.
  • the comparator 94 generates a pulse which is fed to the delay timer 96 when the amplitude is above that preset in the comparator 94.
  • the delay timer 96 delays transmission of the pulse to the logic circuit 98 for a predetermined period of time.
  • the purpose of the delay is that, should the owner of the intrusion detector wish to turn it off, he is permitted to enter the scanning region, locate the on/off controller 100 and turn the unit off. Therefore, the delay time by the timer 96 is such to permit-a person knowing the proper sequence to turn off the devide before the alarm 102, comprising driver and horn, is set off by the logic circuit 98.
  • the on/off control system 100 may be something more complicated than a simple on/off switch and which can only be operated by the owner of the device who would have the particular combination or know the particular technique for turning off the unit.
  • the collector devices may be in the form of parabolic-shaped mirrors or other curved shapes for mirrors which have the necessary curvature to provide a focal point at the sensor.
  • the reflector array 20 may be made up of multi-faceted planar arrays to determine the various sensitive regions. The complexity of the array will be determined, of course, by its end use where for domestic purposes four sensitive regions would be suitable.
  • the reflector arrays themselves may, if cost permits, be of a curved nature of individual facets to effect a further focusing of the converging radiation onto the detector, should a more compact arrangement be desired.
  • the optical system is, therefore, capable in a simple manner of gathering greater amounts of radiation over extended fields in a more compact arrangement compared to prior art devices.
  • the several areas of sensitive regions are dependent upon the number of mirrors involved in thereflector array, resulting in no need to segment or break up the optical collectors.
  • the reflector array in combination with the collector optics, provides better infrared radiation gathering capabilities than existing prior art for such a compact device.
  • thermopiles require relatively high concentrations of radiation in order to properly function, whereas the more sensitive pyro-electric devices do not require as high a concentration of radiation.
  • thermopile devices are less expensive and, therefore, the optical system of this invention is more suited to the economic manufacture of an intrusion detector.
  • the reflector array also provides greater flexibility in design in terms of the capability of adding any number of desired sensitive regions. From a single collector surface, multiple regions may be established as determined by the number of facets in the reflector array.
  • the mirrors may be plated with a high reflectivity material.
  • a high reflectivity material For domestic application, it may be possible to plastic injection mold the bases for the mirrors and plate the plastic with highly reflective materials, such as gold-chromium. Plating may be accomplished by electro-deposition or vacuum emission deposition.
EP80301819A 1979-06-11 1980-06-02 Détecteur d'intrusion à infrarouges et système optique pour un tel détecteur Ceased EP0021630A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA329,480A CA1095302A (fr) 1979-06-11 1979-06-11 Traduction non-disponible
CA329480 1979-06-11

Publications (2)

Publication Number Publication Date
EP0021630A2 true EP0021630A2 (fr) 1981-01-07
EP0021630A3 EP0021630A3 (fr) 1981-01-21

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EP80301819A Ceased EP0021630A3 (fr) 1979-06-11 1980-06-02 Détecteur d'intrusion à infrarouges et système optique pour un tel détecteur

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EP (1) EP0021630A3 (fr)
JP (1) JPS562091A (fr)
CA (1) CA1095302A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050751A1 (fr) * 1980-10-24 1982-05-05 Cerberus Ag Arrangement optique pour un détecteur d'intrusion à infrarouge
US4935140A (en) * 1982-11-16 1990-06-19 Gambro Dialysatoren Kg Membrane and process for producing the membrane
CN103323121A (zh) * 2012-03-23 2013-09-25 三星电子株式会社 红外线检测装置以及具有该红外线检测装置的加热烹饪器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2861696D1 (en) * 1977-09-07 1982-04-29 Ici Plc Thermoplastic aromatic polyetherketones, a method for their preparation and their application as electrical insulants

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3886360A (en) * 1973-09-04 1975-05-27 Gulf & Western Mfg Co Infrared intrusion detection apparatus
FR2399078A1 (fr) * 1958-02-22 1979-02-23 Heimann Gmbh Avertisseur passif a rayonnement infrarouge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2399078A1 (fr) * 1958-02-22 1979-02-23 Heimann Gmbh Avertisseur passif a rayonnement infrarouge
US3886360A (en) * 1973-09-04 1975-05-27 Gulf & Western Mfg Co Infrared intrusion detection apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0050751A1 (fr) * 1980-10-24 1982-05-05 Cerberus Ag Arrangement optique pour un détecteur d'intrusion à infrarouge
US4935140A (en) * 1982-11-16 1990-06-19 Gambro Dialysatoren Kg Membrane and process for producing the membrane
CN103323121A (zh) * 2012-03-23 2013-09-25 三星电子株式会社 红外线检测装置以及具有该红外线检测装置的加热烹饪器
EP2642822A1 (fr) 2012-03-23 2013-09-25 Samsung Electronics Co., Ltd Appareil de détection de rayons infrarouges et four à micro-ondes équipé de celui-ci
AU2013201822B2 (en) * 2012-03-23 2015-05-14 Samsung Electronics Co., Ltd Infrared ray detecting apparatus and heating cooker having the same
US9606004B2 (en) 2012-03-23 2017-03-28 Samsung Electronics Co., Ltd. Infrared ray detecting apparatus and heating cooker having the same
CN103323121B (zh) * 2012-03-23 2018-01-23 三星电子株式会社 红外线检测装置以及具有该红外线检测装置的加热烹饪器

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Publication number Publication date
JPS562091A (en) 1981-01-10
CA1095302A (fr) 1981-02-10
EP0021630A3 (fr) 1981-01-21

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Inventor name: HAWKEN, DONALD FREDERICK