EP0117162A1 - Verfahren für die Detektion einer Wärmequelle insbesondere eines Waldbrandes in einer überwachten Zone und System zur Durchführung dieses Verfahrens - Google Patents

Verfahren für die Detektion einer Wärmequelle insbesondere eines Waldbrandes in einer überwachten Zone und System zur Durchführung dieses Verfahrens Download PDF

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Publication number
EP0117162A1
EP0117162A1 EP84400030A EP84400030A EP0117162A1 EP 0117162 A1 EP0117162 A1 EP 0117162A1 EP 84400030 A EP84400030 A EP 84400030A EP 84400030 A EP84400030 A EP 84400030A EP 0117162 A1 EP0117162 A1 EP 0117162A1
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EP
European Patent Office
Prior art keywords
detector
information
central station
infrared radiation
monitored
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Granted
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EP84400030A
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English (en)
French (fr)
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EP0117162B1 (de
Inventor
François Patrice Didier Brown de Colstoun
Jean-Paul Chambaret
Yves Chambaret
Arnaud Gérard Le Saige de la Villesbrunne
Jean-Claude Marian Moscovici
Michel Moscovici
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Individual
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Priority to AT84400030T priority Critical patent/ATE41539T1/de
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Publication of EP0117162B1 publication Critical patent/EP0117162B1/de
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/005—Fire alarms; Alarms responsive to explosion for forest fires, e.g. detecting fires spread over a large or outdoors area
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/12—Actuation by presence of radiation or particles, e.g. of infrared radiation or of ions

Definitions

  • the subject of the present invention is a method for detecting a heat source which may appear in a predetermined area or space, if necessary of a large extent, in particular a fire in a forest, and a system for putting it using this process.
  • the forest area concerned When atmospheric conditions are favorable for the start or development of fires, the forest area concerned is placed under surveillance. A number of towers or observation posts of relatively high height are distributed in the area. At the top of each tower, a firefighter scans the horizon to visually detect smoke not listed on the list in the possession of the watchman, signaling the existence of a fire. If he finds such a fire, he warns by telephone the center of the forest firefighters. In this center, on a staff card, the identified direction is located and, after receiving a call from a nearby tower, the location is carried out by triangulation of the identified fire. For some for reasons of aim accuracy, the intervention of a third round is necessary or at least desirable.
  • the object of the present invention is to propose a method and a system for detecting a heat source, in particular a fire, which do not have the abovementioned drawbacks inherent in the known method and system.
  • the invention therefore relates to a method for the detection of heat sources, in particular forest fires or the like, in a zone or space in particular of large extent, according to which the above-mentioned zone is monitored from at least two stations monitoring station, transmits information relating to a detected heat source to a central station, via a transmission link, such as that a telephone link, and locates in this central station the heat source, from the information received from the monitoring stations, this method being characterized in that the said area is monitored using a radiation detector infrared at each monitoring station, causes this detector to perform, periodically and preferably permanently, angular sweeping movements of the area to be monitored, transmits to the central station information relating to all the detected heat sources and performs automatic, in the central station, a comparison of the information received from the detectors with the information previously stored in this station, relating to known heat sources and not to be taken into account, in order to determine the newly appeared heat sources.
  • the detector is moved in a step-by-step regime and transmits to the central station the information that the detector has received during each corresponding shutdown phase.
  • the detector is caused to carry out a vertical scanning movement during each stop phase, around a horizontal axis, the scanning advantageously being carried out at a high frequency.
  • the information relating to the intensity of infrared radiation received during the stopping of each step or of several steps is transmitted to the aforementioned center in digital form, stores this information in the center and returns it to the detector device in which the information received from the center is compared to the informa tion initially transmitted to it and indicates to the center with the following information, if necessary by a bit of value "0" or "1" if there was equivalence between the compared information and invalidates the information stored in the center in case of a difference.
  • data is transmitted with each information relating to the intensity of infrared radiation such as a synchronization bit which is used in the center to synchronize the allocation to said information received relating to the radiation, information relating to the corresponding angular position of the detector.
  • the system for implementing the method according to the present invention is characterized in that it comprises a certain number of monitoring stations distributed in the area to be monitored, comprising an infrared radiation detector located at a level above the area to be monitored and connected to a drive motor in periodic angular movement, step by step, of the detector, and a device for logical processing of the information received by the detector and for transmission via the telephone link, and in that the central station is equipped with a computer device comprising a memory in which the known heat sources in the area to be monitored are recorded or listed.
  • the detector is provided with means allowing vertical scanning during each angular position corresponding to a step of the detector.
  • the vertical scanning means is formed by a mirror vibrating at a high frequency.
  • the method and system according to the present invention are particularly suitable for detecting heat sources such as fires in large forests. It is therefore advantageous to describe the invention by taking as an example of ap application of a forest monitoring system as shown in FIG. 1. It should be noted that the invention is however in no way limited to such an application and can be used in any case where it is a question of detecting and locate in a predetermined area the appearance of an object or phenomenon, mobile or immobile, which emits infrared radiation.
  • the embodiment of the invention for the detection of forest fires, comprises a certain number of surveillance towers of which only one is represented. These towers are of sufficient height and are appropriately placed so that their top is located at a level above any fire sources to be detected in the monitored forest area.
  • an equipment item comprising in particular an infrared radiation sensor-detector assembly 2, rotatable around a substantially vertical axis in order to be able to perform a horizontal scanning movement, an optical encoder 3 associated with this assembly and intended determine the angular positions of the latter, a device 4 for processing the signals produced by the detector and representative of the intensity of the infrared radiation received, as well as a modem 5 connected to a telephone line 6 and intended to adapt the electrical signals properties of the telephone line.
  • an infrared radiation sensor-detector assembly 2 rotatable around a substantially vertical axis in order to be able to perform a horizontal scanning movement
  • an optical encoder 3 associated with this assembly and intended determine the angular positions of the latter
  • a device 4 for processing the signals produced by the detector and representative of the intensity of the infrared radiation received
  • modem 5 connected to a telephone line 6 and intended to adapt the electrical signals properties of the telephone line.
  • Telephone lines such as line 6 connect the various monitoring stations at the top of the towers 1 to a central station 7, advantageously a computer, via modems 8 and multiplexers. with eight channels 9, each associated with eight modems.
  • the reference numeral 10 designates a storage and archiving device associated with the computer 7.
  • the telephone line link from the central station to the various surveillance stations could be replaced by any other means of communication.
  • the type of connection should be chosen according to the infrastructure already in place or that can be installed, easily and economically.
  • the infra-red radiation sensor-detector assembly 2 will be described below in more detail.
  • This assembly 2 comprises an optical radiation collecting device, provided with an infrared filter 12, a spherical collecting mirror 13 and the detector proper 14 which is provided with a window 15 of rectangular shape according to FIG. 3.
  • the assembly surrounded in Figure 2 by a line in broken lines is rotatable about a vertical axis centered on the center of the slot 15 and on the detector located below and fixed.
  • This assembly is driven in rotation by a stepping motor 16 in the direction of rotation indicated at 17 in order to be able to thus carry out the horizontal scanning movement.
  • the slot 15 which is part of the rotary assembly is shown in dotted lines in several angular positions above the fixed sensitive surface 18 of the detector 14.
  • a vibrating mirror 20 is arranged in the rotary assembly in the focal zone of the collecting optic 13 so as to move the image of the detector in the image focal plane of this optic or, in other words, so as to form on the fixed detector 14 the image of part of the vertical field.
  • This mirror vibrates at a relatively high frequency for reasons which will be explained later.
  • the objective of the system according to the present invention is to detect forest fires up to distances of up to 20 km. It is important that the information, that is to say the radiation emitted by a fire, is transmitted to the detector with the minimum of absorption.
  • the absorption spectrum of the atmosphere of infrared radiation we note the existence of a certain number of spectral bands or windows which are particularly transparent to this radiation.
  • the band of wavelengths ranging from 3 to 5.5 microns is used as windows.
  • the atmospheric transmission is good and the stray radiation such as for example the solar radiation is limited.
  • This window proved to be advantageous for optimal monitoring 24 hours a day, therefore even in broad daylight.
  • Detectors which are effective in this wavelength range are for example PbSe detectors, cooled to -45 ° C.
  • the choice of infrared radiation detector depends on the specific conditions and criteria of each application case.
  • the optical encoder provided for defining the angular positions of the rotary optical system must therefore be able to differentiate 2 13 different directions per revolution.
  • the fastest speed of analysis of the horizon will advantageously correspond to one revolution in 40 seconds.
  • the analysis time of a sector is therefore approximately 5 ms corresponding to a frequency of 200 Hz.
  • the detector is advantageous for the detector to have a bandwidth approximately 10 times greater, that is to say about 2 KHz.
  • the vertical observation field and warmly the frequency of the vertical scanning, the following should be taken into account: if the observation towers have an altitude of 40 m and if the limit upper of the vertical observation field is the horizontal direction, which makes it possible to avoid being in direct observation of the sun, except in the morning and in the evening, and taking as a lower limit a shadow zone of 200 m around the foot of the tower, we get a vertical field of view equal to 15 x 10 -2 rds. It should be noted that this gray area is relative, because any fire which would be born there will be immediately detected because of the fumes which would cross the observation area, at a distance very close to the detection system.
  • this mirror advantageously vibrates at a sufficiently high frequency that the detector seems to see the entire vertical angular field at once. It is therefore advantageous to choose a vibration frequency of the order of 20 KHz, that is to say 100 times higher than the analysis frequency of a horizontal sector and 10 times higher than the upper limit of the detection system bandwidth (2 KHz).
  • FIG. 4 represents another embodiment of the sensor-infrared radiation detector assembly. red 2.
  • This comprises an optical radiation collecting device, provided with the infrared filter 12, a device 13a forming an objective and the detector 14 provided with the window 15.
  • all surrounded in Figure 4 and by a broken line is rotatable about a vertical axis centered Surle center of the slit 15 and the detector 14 located below and fixe..Cet ensemblee s t rotated in the same way as that of Figure 2 so that the drive means 16 has been omitted in Figure 4.
  • a rotating mirror 20a in the clockwise direction watch is arranged in the rotary assembly in the focal zone of the objective 13a so as to form on the fixed detector 14 the image of part of the vertical field.
  • the mirror 20a has several reflecting surfaces 20 al - 20 as arranged for example in an octagon and focuses the infrared radiation on the detector 14 via the converging lens 13b located above the detector 14 and the slot 15.
  • the mirror rotates around of the axis passing through the center 0 of the octagon and perpendicular to the axis in phantom through the centers of the lens 13b, of the slot 15, and of the detector 14.
  • the angular speed of rotation of the mirror 20a. must be chosen so that it is high enough so that the detector seems to see the entire vertical angular field at once. This speed can be chosen in accordance with the vibration frequency of the mirror 20 defined above.
  • the detector 2 emits an electrical signal directly proportional to the intensity of the infrared radiation received. This signal is transmitted to the processing device 4 in which it is amplified at 22, shaped at 23, converted to 24 under digital form by an analog-digital converter and processed in a logic processing and transmission control circuit 25, before reach modem 5, as shown in figure 8.
  • FIG. 5 shows the electrical output signal from the detector 2 as a function of the angular position ⁇ h of the rotary optical assembly of the detector, during the scanning of the horizontal field.
  • This signal has peaks in a, b and c which are representative respectively of a light from 5 m to 20 km, from 5 m to 15 km and from 5 m to _5 km.
  • the sudden rise in d of the output signal level is caused by the sun.
  • sources of heat to be identified such as fire sources a, b and c, heat source d and others, will be made in the central station as described below.
  • these peaks are characterized less by their amplitude relative to the parasitic background - amplitude which can be relatively small as in the case of the peak a - but rather by the shape of these ridges which is distinguished by very steep front and rear flanks, that is to say very short rise times.
  • the pulses a ', b', c 'and d' are obtained at the output of the shaping circuit 23 (FIG. 6), which correspond to the peaks a, b, c and d.
  • the analog converter digital 24 converts each pulse which contains information on the intensity of infrared radiation emitted by the heat source into an 8-bit digital signal.
  • the logic processing and transmission control module 25 receives for each heat source the digital signal relating to the intensity of the radiation and the corresponding information relating to the angular position of the rotary optical assembly, which has been generated by the optical encoder 3 in the form of a 13-bit digital signal; if each angular position corresponds to an angular segment of 2 ⁇ h 7.7 x 10- 4 radians as in the present example.
  • the module 25 first orders the signals so that they can be transmitted by the modem 5. Since the modem only accepts 8-bit signals in series, the module 25 combines the two pieces of information respectively of 13 parallel bits and 8 parallel bits into 8 bit serial information.
  • Figures 8 and 9 illustrate the structure of the information bytes transmitted by the modem 5 to the central station 7 ( Figure 1).
  • the module 25 should perform information compression. This consists first of all of not transmitting the 13 bits of angular position. In the 8-bit train sent to modem 5, only one bit is used for position tracking. This is a synchronization bit which is always in the low logic state "0", except when switching to the digital angular position 0000000000000 where the synchronization signal is at the high logic level "1". This bit allows the reconstitution of the information relating to the angular position in the central station.
  • the latter includes for this purpose a 13-bit counter which is reset to zero by the synchronization bit and which is incremented by one step at each new trans one byte mission. With regard to the radiation intensity level data, the precision of 8 bits is not necessary and one is satisfied with an accuracy of 3 bits.
  • Each byte thus formed is transmitted to the modem 5 which sends it to the modem 8 by the permanent telephone line 6.
  • the byte is stored in the computer of the central station 7. It is then re-injected by the computer in the modem 8 which retransmits it to the modem 5 to arrive at the processing module 25.
  • the latter compares the start byte and the return byte. If the two bytes are equivalent, the transmission was successful and the computer memorized correct data. If the two bytes are different, a transmission error has occurred and the computer has stored false data.
  • the module of transmission control logic processing 25 acts on the control of the stepping motor 16 driving the sensor formed by the rotary optical assembly of the detector 2.
  • the motor now places the sensor in position n + 2.
  • the sensor produces a new output signal which will be processed by the shaping circuit 23, after amplification at 22, and applied to the analog-digital converter 24.
  • the module 25 then triggers the analog-digital conversion and stores the radiation intensity byte relative to position n + 2. Then, the module 25 acts again on the rotation control of the motor 16, to place the sensor in the position n + 3. It triggers a new analog-digital conversion, then from the new recorded data, sends to modem 5 the byte n + 2, n + 3 according to figure 9.
  • This byte contains in bit D 1 the information relating to the comparison of o ctet transmitted previously containing the information relating to the angular positions n and n + 1 (figure 8). If the previous comparison operation found a transmission error, the error bit of the new byte is in the high logic state "1" which causes the byte (n, n + 1) to be invalidated previously. recorded by the computer.
  • the central station computer is provided with a memory in which information relating to sources has been recorded. To find out if a heat source identified by detector 2 is a fire, the computer performs, following the reception of each byte, after having associated with the information received the information relating to the angular position of the detector sensor , using its 13-bit counter and the synchronization bit D 0 contained in the byte received, a comparison with the content of its memory.
  • the central station 7 or more exactly the computer permanently receives a flow of information from the various monitoring stations each equipped with an infrared radiation detector. If a heat source turns out to be a fire, it can be easily located from the start and action can be taken immediately to extinguish the start of the fire.
  • the invention is in no way limited to the detection of a fire.
  • the invention can be used to detect the appearance or penetration into a monitored area of any object or phenomenon giving rise to the emission of infrared radiation.
  • the invention could thus be used to monitor, for example, a border.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
  • Alarm Systems (AREA)
  • Emergency Alarm Devices (AREA)
EP84400030A 1983-01-13 1984-01-06 Verfahren für die Detektion einer Wärmequelle insbesondere eines Waldbrandes in einer überwachten Zone und System zur Durchführung dieses Verfahrens Expired EP0117162B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400030T ATE41539T1 (de) 1983-01-13 1984-01-06 Verfahren fuer die detektion einer waermequelle insbesondere eines waldbrandes in einer ueberwachten zone und system zur durchfuehrung dieses verfahrens.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8300461A FR2541484B1 (fr) 1983-01-13 1983-01-13 Procede pour la detection d'une source de chaleur notamment d'un incendie de foret dans une zone surveillee, et systeme pour la mise en oeuvre de ce procede
FR8300461 1983-01-13

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EP0117162A1 true EP0117162A1 (de) 1984-08-29
EP0117162B1 EP0117162B1 (de) 1989-03-15

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EP84400030A Expired EP0117162B1 (de) 1983-01-13 1984-01-06 Verfahren für die Detektion einer Wärmequelle insbesondere eines Waldbrandes in einer überwachten Zone und System zur Durchführung dieses Verfahrens

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US (1) US4567367A (de)
EP (1) EP0117162B1 (de)
AT (1) ATE41539T1 (de)
AU (1) AU576746B2 (de)
CA (1) CA1229143A (de)
DE (1) DE3477285D1 (de)
ES (1) ES8407349A1 (de)
FR (1) FR2541484B1 (de)
GR (1) GR79473B (de)
MA (1) MA20004A1 (de)
PT (1) PT77948B (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572564A1 (fr) * 1984-10-30 1986-05-02 Macron Patrick Appareil electronique de surveillance et de lutte contre l'intrusion
EP0209397A2 (de) * 1985-07-18 1987-01-21 General De Investigacion Y Desarrollo, S.A. Flughafenüberwachungssysteme
DE3614277A1 (de) * 1986-04-25 1987-10-29 Takenaka Komuten Co Abtastfeuerueberwachungssystem
FR2598238A1 (fr) * 1986-05-05 1987-11-06 Latecoere Ste Indle Aviat Procede et dispositif pour detecteur les incendies
EP0279792A2 (de) * 1987-02-19 1988-08-24 Teletron Srl Kontrollsystem das im Bereich des sichtbaren Lichts und/oder im Bereich der Infrarotstrahlung arbeitet, besonders geeignet für die Verhütung von Bränden
FR2614984A1 (fr) * 1987-05-05 1988-11-10 Argamakoff Aleksy Detecteur automatique d'incendies de foret
EP0298182A1 (de) * 1987-05-06 1989-01-11 Societe Industrielle D'aviation Latecoere Feuerdetektionsverfahren und Vorrichtung dafür
EP0364364A1 (de) * 1988-10-13 1990-04-18 François Brown de Colstoun Verfahren und System zur Detektion, insbesondere von Waldbränden
GR890100820A (el) * 1989-12-13 1992-05-12 Alexiou Apostolos D Αυτοματο-αυτονομο συστημα τηλεπυρανιχνευσης και μεταδοσης χρησιμων πληροφοριων αντλουμενων απο το περιβαλλον.
FR2669455A1 (fr) * 1990-11-21 1992-05-22 Dassault Electronique Installation de teledetection aerienne et/ou terrestre, notamment pour la detection des feux de forets.
EP0493247A1 (de) * 1990-12-27 1992-07-01 Sopelem-Sofretec Anordnung zur Entfernungsmessung, um reflektierende Objekte oder Substanzen zu entdecken und zu orten

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US4975584A (en) * 1989-03-29 1990-12-04 Mountain Ocean, Ltd. Method and apparatus for collecting, processing and displaying ultraviolet radiation data
US5160842A (en) * 1991-06-24 1992-11-03 Mid-Valley Helicopters, Inc. Infrared fire-perimeter mapping
IL105772A (en) 1992-06-01 1998-07-15 Univ Florida Methods and materials for pest control
ES2070710B1 (es) * 1993-02-10 1997-05-01 Nacional Bazan De Construccion Sistema de vigilancia y deteccion de focos de calor en areas abiertas .
US5534697A (en) * 1994-09-02 1996-07-09 Rockwell International Corporation Electro-optical sensor system for use in observing objects
US5502309A (en) * 1994-09-06 1996-03-26 Rockwell International Corporation Staring sensor
US5627675A (en) * 1995-05-13 1997-05-06 Boeing North American Inc. Optics assembly for observing a panoramic scene
US5841589A (en) * 1995-09-26 1998-11-24 Boeing North American, Inc. Panoramic optics assembly having an initial flat reflective element
US5815090A (en) * 1996-10-31 1998-09-29 University Of Florida Research Foundation, Inc. Remote monitoring system for detecting termites
GB2348531A (en) * 1999-02-17 2000-10-04 Bambour Olubukola Omoyiola Forest fire detector unit
US6404210B1 (en) 1999-03-02 2002-06-11 University Of Florida Research Foundation, Inc. Dimensionally stable sensor for monitoring termite activity
ITRM20040245A1 (it) * 2004-05-14 2004-08-14 Gen Contractor S R L Metodo per il rilevamento volumetrico ottimizzato di eventi su un'area geografica, apparato utilizzante tale metodo e relativo sistema di rilevamento.
CN108520615B (zh) * 2018-04-20 2020-08-25 吉林省林业科学研究院 一种基于图像的火灾识别系统和方法
CN112991657A (zh) * 2021-02-08 2021-06-18 四川省铭阳睿智科技有限公司 基于5g通信技术的森林火灾智能预警控制系统

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GB1127443A (en) * 1965-01-13 1968-09-18 Thring S Advanced Developments Improvements in or relating to fire detection and fighting apparatus
US3493953A (en) * 1965-08-14 1970-02-03 Thrings Advanced Dev Ltd Fire alarm with infra-red scanner
US3475608A (en) * 1967-11-02 1969-10-28 Us Army Thermal,moving target,intrusion detector
FR2224818A1 (en) * 1973-04-05 1974-10-31 Onera (Off Nat Aerospatiale) Forest fire detection appts - responsive to visible or infra red radiation in area surrounding observation post

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2572564A1 (fr) * 1984-10-30 1986-05-02 Macron Patrick Appareil electronique de surveillance et de lutte contre l'intrusion
EP0209397A2 (de) * 1985-07-18 1987-01-21 General De Investigacion Y Desarrollo, S.A. Flughafenüberwachungssysteme
EP0209397A3 (en) * 1985-07-18 1989-04-12 General De Investigacion Y Desarrollo, S.A. Airport surveillance systems
DE3614277A1 (de) * 1986-04-25 1987-10-29 Takenaka Komuten Co Abtastfeuerueberwachungssystem
FR2598238A1 (fr) * 1986-05-05 1987-11-06 Latecoere Ste Indle Aviat Procede et dispositif pour detecteur les incendies
EP0279792A3 (en) * 1987-02-19 1990-05-30 Teletron Srl Control system in the visible and/or infrared region, especially suitable for fire prevention
EP0279792A2 (de) * 1987-02-19 1988-08-24 Teletron Srl Kontrollsystem das im Bereich des sichtbaren Lichts und/oder im Bereich der Infrarotstrahlung arbeitet, besonders geeignet für die Verhütung von Bränden
FR2614984A1 (fr) * 1987-05-05 1988-11-10 Argamakoff Aleksy Detecteur automatique d'incendies de foret
EP0298182A1 (de) * 1987-05-06 1989-01-11 Societe Industrielle D'aviation Latecoere Feuerdetektionsverfahren und Vorrichtung dafür
EP0364364A1 (de) * 1988-10-13 1990-04-18 François Brown de Colstoun Verfahren und System zur Detektion, insbesondere von Waldbränden
FR2637977A1 (fr) * 1988-10-13 1990-04-20 Brown De Colstoun Francois Procede et systeme pour la detection notamment de feu de forets
US5049756A (en) * 1988-10-13 1991-09-17 Brown De Colstoun Francois Method and system for detecting forest fires
GR890100820A (el) * 1989-12-13 1992-05-12 Alexiou Apostolos D Αυτοματο-αυτονομο συστημα τηλεπυρανιχνευσης και μεταδοσης χρησιμων πληροφοριων αντλουμενων απο το περιβαλλον.
FR2669455A1 (fr) * 1990-11-21 1992-05-22 Dassault Electronique Installation de teledetection aerienne et/ou terrestre, notamment pour la detection des feux de forets.
EP0490722A1 (de) * 1990-11-21 1992-06-17 Dassault Electronique Einrichtung zur Luft- und/oder Landferndetektierung, insbesondere zur Detektierung der Waldbrände
EP0493247A1 (de) * 1990-12-27 1992-07-01 Sopelem-Sofretec Anordnung zur Entfernungsmessung, um reflektierende Objekte oder Substanzen zu entdecken und zu orten
FR2671196A1 (fr) * 1990-12-27 1992-07-03 Sopelem Dispositif telemetrique pour la detection et la localisation d'objets ou de substances retrodiffusants.

Also Published As

Publication number Publication date
FR2541484A1 (fr) 1984-08-24
MA20004A1 (fr) 1984-10-01
DE3477285D1 (en) 1989-04-20
PT77948A (fr) 1984-02-01
CA1229143A (en) 1987-11-10
US4567367A (en) 1986-01-28
ES528840A0 (es) 1984-09-16
AU576746B2 (en) 1988-09-08
AU2314784A (en) 1984-07-19
EP0117162B1 (de) 1989-03-15
PT77948B (fr) 1986-04-10
ATE41539T1 (de) 1989-04-15
FR2541484B1 (fr) 1986-06-13
ES8407349A1 (es) 1984-09-16
GR79473B (de) 1984-10-30

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