WO2002097756A1 - Dispositif de detection d'un rayonnement lumineux - Google Patents
Dispositif de detection d'un rayonnement lumineux Download PDFInfo
- Publication number
- WO2002097756A1 WO2002097756A1 PCT/FR2002/001778 FR0201778W WO02097756A1 WO 2002097756 A1 WO2002097756 A1 WO 2002097756A1 FR 0201778 W FR0201778 W FR 0201778W WO 02097756 A1 WO02097756 A1 WO 02097756A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensitive
- parts
- radiation
- zone
- sensor
- 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
Links
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
- the present invention relates to the field of devices for detecting light radiation, in particular infrared radiation.
- Such detection devices are commonly used in particular as components of an alarm system in order to detect the presence of intruders in places to be protected.
- They generally comprise a pyroelectric sensor which has on a front face two zones sensitive to the radiation to be picked up, offset horizontally, and generally composed of a pyroelectric ceramic or monocrystalline material which, when subjected to infrared radiation, generates electrical charges.
- a pyroelectric ceramic or monocrystalline material which, when subjected to infrared radiation, generates electrical charges.
- an optical system composed in particular of optical lenses, which makes it possible to focus towards said sensitive areas the radiation emitted by sources present in corresponding fields of vision.
- the electrical signal from the radiation sensor is then processed so as to deliver an alarm signal in the event of the presence of an intruder in one of the fields of vision.
- the detection devices are capable of delivering a signal taking account of the morphology of the intruder so as to make it possible to distinguish intruders of small sizes such as domestic animals from intruders of larger ones. sizes such as human beings.
- document US-A-5 670 943 suggests that each sensitive zone of the pyroelectric sensor is of rectangular shape and document WO-A-00/62 267 proposes to use an optical system composed of diffractive lenses with elliptical zones.
- the object of the present invention is to propose a simple device for detecting light radiation which, in particular in its application to the detection of intruders in a place to be protected in order to trigger an alarm, makes it possible to improve the discrimination of intruders of small sizes compared to intruders of larger sizes.
- the subject of the present invention is a device for detecting light radiation, in particular infrared radiation, which comprises a radiation sensor having on a front face at least one zone sensitive to the radiation to be picked up and delivering at least one signal. , and an optical system making it possible to focus the radiation emitted by a light source situated in at least one field of vision towards said sensitive area of said sensor.
- the surface of said sensitive area is divisible or divided into at least two parts located one after the other in a direction and either said sensitive area does not have an axis of symmetry perpendicular to the aforementioned direction and its sensitivity per unit area is substantially homogeneous, ie said parts of said sensitive area have different sensitivities per unit area; so that when said parts of said sensitive area are respectively subjected to a uniform illumination from the same light source, the sensor delivers different signals.
- said parts can advantageously have surfaces of different areas and sensitivities per unit of identical surface.
- said parts may advantageously have surfaces of identical areas and sensitivities per unit of surface area.
- said sensitive area is preferably of elongated shape in the aforementioned direction.
- said sensitive zone which has a sensitivity per substantially homogeneous surface unit, is elongated in a direction and does not have an axis of symmetry perpendicular to this direction, said sensitive zone comprising two parts which are located one after the other in the direction mentioned above and which have, with respect to a dividing line situated substantially in the middle of the length of the said zone sensitive, surfaces of different areas such that when said parts of said sensitive area are respectively subjected to a uniform illumination coming from the same light source, the sensor delivers different signals.
- said sensitive zone could be trapezoidal, its widest part corresponding to said part whose surface is the largest and its narrowest part corresponding to said part whose surface is smallest, so as to obtain a sensitivity gradient from its narrow end to its wide end.
- at least one of said parts of said sensitive zone could have a substantially trapezoidal contour.
- At least one of said parts of said sensitive zone could have a substantially rectangular outline, the long side of which extends in the direction of its length. According to the invention, at least one of said parts of said sensitive zone could have a substantially elliptical contour, the major axis of which extends in the direction of its length.
- At least one of said parts of said sensitive zone could have a substantially square contour.
- said parts of said sensitive zone could be connected by a narrowed part.
- said parts of said sensitive area could be separated.
- said radiation sensor can advantageously have two sensitive zones spaced perpendicular to the aforementioned direction and symmetrical with respect to each other.
- the parts of said sensitive zones whose surfaces are the smallest are preferably closer to each other than the parts of said sensitive zones whose surfaces are the largest.
- said parts of said sensitive zone are electrically connected in series. According to another variant of the invention, said parts of said sensitive zone are electrically mounted in parallel.
- said sensitive areas are electrically connected in series.
- said sensitive zones are electrically mounted in parallel.
- the optical system can advantageously comprise main focusing means and at least one complementary optical member interposed between these means and the front face of the sensor.
- said complementary optical member preferably comprises at least one cylindrical optical lens whose axis extends substantially perpendicular to the elongation of said sensitive zone, said cylindrical lens being placed at a distance from the sensitive zones and less than its focal length.
- FIG. 2 shows a horizontal section of the housing of Figure 1
- - Figure 3 shows a schematic front view of the detection device of Figure 1 and two fields of vision of the latter;
- FIG. 4 shows a schematic perspective view of the detection device of Figure 1 and two fields of vision of the latter;
- FIG 5 shows an electronic diagram of the detection device of Figure 1;
- FIGS. 6 to 12 represent alternative embodiments of the detection device in FIG. 1.
- a device 1 for detecting infrared radiation which comprises a housing 2 whose front wall 3 is partly constituted by an optical system 4 adapted to focus, towards a front face 5 of a radiation sensor 6 installed in the housing at the rear and at a distance from the optical system 4, the space extending in front of this optical system 4.
- the optical system 4 is in particular constituted by an arcuate plate composed of a multiplicity of flattened convex optical lenses 7 commonly called Fresnel lenses, for example placed horizontally next to each other.
- the front face 5 of the sensor 6 has two zones 8 and 9 sensitive to infrared radiation made of a ceramic or monocrystalline material capable of generating electrical charges by pyroelectric effect when they are subjected to infrared radiation, these zones 8 and 9 being of substantially homogeneous sensitivities on all their surfaces.
- the sensitive areas 8 and 9 are for example spaced horizontally, so that they have, through each lens 7 of the optical system 4 respectively fields of vision 10 and 11 spaced horizontally.
- the sensitive zones 8 and 9 are respectively sensitive to infrared radiation capable of being emitted by an intruder cutting or entering the fields of vision 10 and 11.
- the housing 2 is generally fixed in height in the place to be monitored and the optical system 4 and the radiation sensor 6 are oriented so that the axes of the fields of vision 10 and 11 are inclined downward.
- the sensitive zones 8 and 9 of the sensor 6 laterally see an intruder moving in any direction in the place to be monitored.
- the sensitive areas 8 and 9 of the sensor 6 laterally see an intruder moving in any direction in the place to be monitored.
- the sensitive areas In the example shown in Figures 1 to 4, the sensitive areas
- the sensitive zones 8 and 9 have lower parts 8a and 9a whose surfaces are larger than their upper parts 8b and 9b.
- the lower parts 8a and 9a and their upper parts 8b and 9b of the sensitive zones 8 and 9 are thus respectively arranged one after the other in directions extending in the direction of their lengths.
- the corresponding fields of vision 10 and 11 have vertical sections 13 and 14 whose contours are trapezoidal and which have, with respect to an arbitrary horizontal center line 15 corresponding to the center line 12 of sensitive areas 8 and 9, parts upper parts 13a and 14a whose surfaces are larger than their lower parts 13b and 14b.
- the sensitive zones 8 and 9 are placed symmetrically with respect to a vertical axis 16 and have respectively vertical axes of symmetry of directions parallel to this axis 16.
- the fields of vision 10 and 11 are formed in the same way.
- the sensitive zones 8 and 9 therefore do not have axes of symmetry perpendicular to the axis 16. It follows from the above that, when an intruder preferentially cuts the lower part 13b and / or the lower part 14b of the fields of vision 10 and 11, the infrared radiation that it emits will preferably activate the upper part 8b and / or the upper part 9b of smaller areas of the sensitive areas 8 and 9 of the sensor 6, and, when an intruder preferentially cuts the part upper 13a and / or the upper part 14a of the fields of vision 10 and 11, the infrared radiation which it emits will preferably activate the part 8a and / or the part 9a of the sensitive zones 8 and 9 of larger surfaces.
- a small intruder such as a domestic animal will cut the lower parts 13b and / or 14b of the fields of vision 10 and 11 and a larger intruder such as a normal size human being will cut the lower parts 13b and / or 14b and the upper parts 13a and / or 14a fields of vision 10 and 11 and therefore normally the whole section 13 or 14 of these fields.
- the difference between these different electrical signals capable of being delivered by each of the sensitive zones 8 and 9 will be large enough to allow discrimination of the passage of a small intruder compared to the passage of an additional intruder. large size, for example by comparison of these electrical signals with suitable alarm triggering thresholds or by other processing.
- FIG. 5 it can be seen that a diagram has been shown of an electronic circuit 100 adapted to process the electrical signals delivered by the sensitive zones 8 and 9 of the radiation sensor 6.
- the sensitive zones 8 and 9 of the sensor 6 are electrically either mounted in series as shown in solid lines or mounted in parallel as shown in broken lines and are further mounted in opposite polarity, so as to deliver an electrical signal on a line 101 to an input of an amplifier 102.
- the output 103 of this amplifier 102 is connected on the one hand to the positive input (+) of a comparator 104 whose other input is subject to a positive trigger threshold 105 and on the other hand to the negative input (-) of a comparator 106 whose other input is subject to a negative triggering threshold 107.
- the outputs 108 and 109 of the comparators 104 and 106 are connected to the inputs of an OR gate 110 whose output is connected to a alarm circuit 111.
- the sensitive zones 8 and 9 of the sensor 6 are respectively subjected to normally substantially equal radiation, corresponding to the ambient radiation, so that the value of the electrical signal issued on line 101 is normally close to zero, in all cases this value is less than said triggering thresholds.
- one of these comparators delivers a signal to the alarm circuit 111 through the gate 110.
- the trigger thresholds applied to the inputs 105 and 107 of the comparators 104 and 106 are fixed at a value such that they deliver a signal on their outputs 108 and 109 in the event that the signal on line 101 from the electrical installation of sensitive areas 8 and 9 corresponds to infrared radiation corresponding to the presence of a large intruder such as a human being in fields 10 or 11 rather than a small intruder such as an animal as described above.
- the radiation sensor 17 shown in FIG. 6 has sensitive zones 8 and 9 arranged symmetrically with respect to the aforementioned axis 16 and the contours of which are in approximate form. of elongated bottles with axes of symmetry parallel to the axis 16, which have lower portions 8a and 9a plump or elliptical and upper portions 8b and 9b of reduced widths substantially constant.
- the radiation sensor 18 represented in FIG. 7 comprises, as in the example described with reference to FIGS. 1 to 4, sensitive zones 8 and 9 of trapezoidal shape arranged symmetrically with respect to the aforementioned axis 16, but whose the space separating them narrows from their widths of larger dimensions to their widths of smaller dimensions.
- the radiation sensor 20 represented in FIG. 9 differs from that represented in FIG. 7 by the fact that the zones 8 and 9 also have, substantially at half their lengths, therefore along the aforementioned axis 12, of the parts narrowed determining connecting branches 8c and 9c of reduced widths, the lower parts 8a and 9a and the upper parts 8b and 9b thus being respectively connected by branches 8c and 9c of reduced widths.
- the radiation sensor 21 represented in FIG. 10 differs from that represented in FIG. 8 by the fact that the rectangular lower parts 8a and 9a and the rectangular upper parts 8b and 9b of the sensitive zones 8 and 9 have narrowed parts between them , like the example in Figure 9, determining connecting branches 8c and 9c.
- the upper parts 8b and 9b of reduced widths are offset towards each other so as to be closer to each other than the lower parts 8a and 9a.
- the radiation sensor 22 shown in FIG. 11 differs from that described with reference to FIG. 8 by the fact that the lower parts 8a and 9a and the upper parts 8b and 9b of its sensitive zones 8 and 9 are respectively separated or distant from each other in the vertical direction and arranged one after the other in the direction of their lengths.
- the parts 8a and 8b of the sensitive zone 8 and the parts 9a and 9b of the sensitive zone 9 can respectively be electrically connected in series and included in the assembly described with reference to FIG. 5.
- the electrical signal delivered on the line 101 of the electronic circuit 100 has a reduced maximum amplitude and a reduced duration because the animal can advantageously pass through the lower parts 13b or
- the electronic circuit 100 includes a low-pass filter 112 mounted in a feedback loop between the output and an input of the amplifier 102.
- the sensitive zones 8 and 9 have homogeneous sensitivities and do not have an axis of symmetry perpendicular to the axis 16.
- the parts 8a and 9a and the parts 8b and 9b of the sensitive zones 8 and 9 could have different sensitivities per unit of area.
- the parts 8a and 9a and the parts 8b and 9b would preferably be separate, like the example in Figure 11 and could have identical areas. The same results would then be obtained as those described above with regard to the signals delivered by the sensitive zones and the signals delivered on the line 101 of the electronic circuit 100.
- the optical system 4 also has a deforming optical element such as a converging cylindrical lens 7a, interposed between the plate formed by the optical lenses 7 and the front face 5 of the sensor 6 and placed so that its axis is perpendicular to the aforementioned axis of symmetry 16, at a distance from the sensitive zones 8 and 9 less than its focal length.
- a deforming optical element such as a converging cylindrical lens 7a, interposed between the plate formed by the optical lenses 7 and the front face 5 of the sensor 6 and placed so that its axis is perpendicular to the aforementioned axis of symmetry 16, at a distance from the sensitive zones 8 and 9 less than its focal length.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Burglar Alarm Systems (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP02740824A EP1393275A1 (fr) | 2001-06-01 | 2002-05-28 | Dispositif de detection d'un rayonnement lumineux |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0107261A FR2825465B1 (fr) | 2001-06-01 | 2001-06-01 | Dispositif de detection d'un rayonnement lumineux |
| FR01/07261 | 2001-06-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002097756A1 true WO2002097756A1 (fr) | 2002-12-05 |
Family
ID=8863911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2002/001778 Ceased WO2002097756A1 (fr) | 2001-06-01 | 2002-05-28 | Dispositif de detection d'un rayonnement lumineux |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1393275A1 (fr) |
| FR (1) | FR2825465B1 (fr) |
| WO (1) | WO2002097756A1 (fr) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4364030A (en) * | 1979-09-10 | 1982-12-14 | Rossin John A | Intruder detection system |
| US5670943A (en) * | 1996-02-26 | 1997-09-23 | Detection Systems, Inc. | Pet immune intruder detection |
| WO2000013153A1 (fr) * | 1998-08-27 | 2000-03-09 | Rokonet Electronics Ltd. | Procede et dispositif de detection infrarouge d'effraction |
| US6211522B1 (en) * | 1998-01-04 | 2001-04-03 | Visonic Ltd. | Passive infra-red intrusion sensor |
-
2001
- 2001-06-01 FR FR0107261A patent/FR2825465B1/fr not_active Expired - Fee Related
-
2002
- 2002-05-28 WO PCT/FR2002/001778 patent/WO2002097756A1/fr not_active Ceased
- 2002-05-28 EP EP02740824A patent/EP1393275A1/fr not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4364030A (en) * | 1979-09-10 | 1982-12-14 | Rossin John A | Intruder detection system |
| US5670943A (en) * | 1996-02-26 | 1997-09-23 | Detection Systems, Inc. | Pet immune intruder detection |
| US6211522B1 (en) * | 1998-01-04 | 2001-04-03 | Visonic Ltd. | Passive infra-red intrusion sensor |
| WO2000013153A1 (fr) * | 1998-08-27 | 2000-03-09 | Rokonet Electronics Ltd. | Procede et dispositif de detection infrarouge d'effraction |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2825465B1 (fr) | 2004-01-02 |
| FR2825465A1 (fr) | 2002-12-06 |
| EP1393275A1 (fr) | 2004-03-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FR2479991A1 (fr) | Dispositif passif a infrarouges de detection d'intrusion | |
| FR2563646A1 (fr) | Appareil detecteur d'objets comprenant des photodetecteurs et destine a une zone de detection restreinte | |
| FR2548383A1 (fr) | Capteur d'alerte laser pour la detection des rayons lasers et la determination de leur direction | |
| FR2487554A1 (fr) | Appareil passif de detection infrarouge d'intrusions | |
| EP2994901B1 (fr) | Detecteur compact de presence humaine | |
| EP2382783A1 (fr) | Systeme de securite perimetrique par l'analyse active des images reflechies par un jeu de miroirs sur une camera video | |
| EP0276513B1 (fr) | Dispositif de détection d'intrusion et de reconnaissance de véhicules terrestres | |
| FR3010515A1 (fr) | Equipement de vehicule automobile integrant un dispositif de mesure de distances d'objet | |
| EP2005396B1 (fr) | Dispositif de comptage et de détermination du sens de passage d'êtres vivants | |
| EP1393275A1 (fr) | Dispositif de detection d'un rayonnement lumineux | |
| FR2600777A1 (fr) | Dispositif de detection d'une impulsion electromagnetique, due notamment a une explosion nucleaire | |
| CH621001A5 (fr) | ||
| EP1105712B1 (fr) | Dispositif de mesure de la taille de particules en deplacement, notamment pour des mesures pluviometriques | |
| FR3078157A1 (fr) | Dispositif et procede de detection de presence et/ou de mouvement par mesure infrarouge | |
| EP1380811A1 (fr) | Dispositif optique de mesure de distances | |
| FR2789787A1 (fr) | Dispositif de protection perimetrique laser pour piscine | |
| EP0558405A1 (fr) | Dispositif d'évaluation du balisage lumineux notamment sur les pistes et les voies d'accès des avions | |
| FR2789788A1 (fr) | Dispositif de protection perimetrique laser pour piscine | |
| FR2919417A1 (fr) | Capteur de detection d'un vehicule sur un emplacement. | |
| WO2017046349A1 (fr) | Dispositif pour évaluer une concentration particulaire surfacique dans un environnement à atmosphère contrôlée tel qu'une salle propre et procédé associé | |
| FR2484675A1 (fr) | Systeme a double detection de fumee | |
| WO1996027862A1 (fr) | Procede de detection de bruits et dispositif acoustique de detection d'intrusion | |
| FR2746508A1 (fr) | Installation de detection par reflexion | |
| FR2570819A1 (fr) | Detecteur de rayonnement a infrarouge, notamment pour un systeme de protection contre les intrusions | |
| EP2515277A1 (fr) | Dispositif de contrôle du passage d'un concurrent dans une compétition sportive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW |
|
| AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
| WWE | Wipo information: entry into national phase |
Ref document number: 2002740824 Country of ref document: EP |
|
| WWP | Wipo information: published in national office |
Ref document number: 2002740824 Country of ref document: EP |
|
| REG | Reference to national code |
Ref country code: DE Ref legal event code: 8642 |
|
| NENP | Non-entry into the national phase |
Ref country code: JP |
|
| WWW | Wipo information: withdrawn in national office |
Country of ref document: JP |
|
| WWW | Wipo information: withdrawn in national office |
Ref document number: 2002740824 Country of ref document: EP |