EP0159218A1 - Differential pressure access detector - Google Patents

Differential pressure access detector Download PDF

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Publication number
EP0159218A1
EP0159218A1 EP85400411A EP85400411A EP0159218A1 EP 0159218 A1 EP0159218 A1 EP 0159218A1 EP 85400411 A EP85400411 A EP 85400411A EP 85400411 A EP85400411 A EP 85400411A EP 0159218 A1 EP0159218 A1 EP 0159218A1
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EP
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Prior art keywords
differential pressure
detector
pressure access
access detector
frequencies
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EP85400411A
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German (de)
French (fr)
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EP0159218B1 (en
Inventor
Jean Isidore Marie C/O Sogesec S.A.R.L. Guillo
Jacques Gaston René c/o SOGESEC S.A.R.L. Bley
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SOGESEC
Original Assignee
SOGESEC Sarl A RESPONSABILITE Ltee Ste
SOGESEC
SOGESEC Sarl A RESP Ste
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Priority to AT85400411T priority Critical patent/ATE39774T1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/02—Non-electrical signal transmission systems, e.g. optical systems using infrasonic, sonic or ultrasonic waves
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
    • G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
    • G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range

Definitions

  • the invention relates to a differential pressure access detector intended for signaling and passage control.
  • the opening of a door causes movement of the ambient air which can be highlighted by the reaction of another door which would have been previously opened.
  • the corresponding waveform can be compared to the oscillation of a highly damped circuit.
  • This displacement can be detected by a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band such as a piezoelectric, dynamic, condenser, electromagnetic, or other microphone, or a sensor.
  • a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band
  • a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band
  • a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band
  • a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band
  • a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band
  • a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band
  • pressure gauge strain with pressure capsule; with microphone, condenser, etc ...
  • This device is mainly characterized in that it uses as a sensor, an electret microphone, in that it includes an amplifier-filter with fast cut-off frequencies eliminating parasitic signals, in that the signal processing is carried out by logical means.
  • the amplifier filter is capacity switching and its switching frequency can be controlled externally.
  • the logic means used is wired logic or a microprocessor combined with an analog-to-digital converter.
  • the device consists of a sensor 1, of an adaptation 2, of a means 3 for processing the signal supplied by the adaptation and of a signaling 4.
  • the signal processing means 3 provided by the adapter 2 consists of a alternation + detector 5 and - controlling an energy integrator 6, which is connected to an adjustable sensitivity comparator 7 connected to a means of decision-making 8.
  • the + and - detector is connected to the decision-making means 8, respectively via a counting device 9, a time integration means 10 and a comparator 11 , and a time delay 12.
  • the signaling means 4 comprises a relay control 13 and a usage control device 14.
  • the sensor 1, providing an exploitable electrical signal in the useful frequency band is, according to a preferred embodiment, consisting of an electret microphone whose passband is exploitable.
  • Adapter 2 is an amplifier with fast cut-off frequencies, eliminating parasitic signals, which, according to a preferred embodiment, is an externally controllable capacitance switching amplifier filter.
  • Information processing is carried out by means of a wired logic allowing the counting of events, the integration of the energy captured, the integration of duration and timing.
  • Comparator 2 connected to the duration integrator 10, has a fixed or adjustable threshold.
  • the processing is carried out by means of a microprocessor with digital analog converter and of calculation program allowing the reconstruction of the useful signal and the elimination of the parasitic components, as well as the 'identification of preprogram models, learning of models to be recognized and taking into account ambient parameters for a correction of the calculations.
  • Signaling takes place via relays, a photo-coupling link, or any other means.
  • the signal supplied by the sensor 1 is directed simultaneously to the alternation detector 5 and to the integrator d energy in absolute value 6.
  • the output of the alternation detector 5 controls the energy integrator 6, with a view to quantifying the signal and comparing it to a predetermined value adjustable by means of a sensitivity adjustment.
  • the alternation detector 5 controls the time delay 12 and the event counter 9, the outputs of which validate normal operation.
  • the time delay 12 determines the moment of decision-making.
  • the control of the signaling relay by the decision-making circuit 8 is therefore a function of the event count values, the duration of events, energy received and analysis time.
  • This detector is mainly intended to be used in the security field, but it can be adapted for other uses concerning in particular the security of people and goods and access and passage control in combination with a signal transmitter portable sound systems.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Fluid Pressure (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Measuring Volume Flow (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

1. Differential pressure access detector of the type including a pressure sensor associated with an amplification filter with quick out-off frequencies intended for eliminating the interference frequency acoustic signals, characterized in that the logic means used for processing the signal is a wired logic including a + and - alternation detector (5), by the output of which a counting device (9) is parallel fed, a duration integration means (10) followed by a comparator (11), and a retarder (12), said alternation detector (5) receiving the signal to be processed in parallel with an energy integrator (6) which it controls and which is followed by an adjustable threshold comparator (7), the output of which as well as the outputs of the parallel elements (9), (10) and (12) end in a decision means (8).

Description

L'invention concerne un détecteur d'accès à pression différentielle destiné à la signalisation et au contrôle de passage.The invention relates to a differential pressure access detector intended for signaling and passage control.

En prenant un exemple lié à la détection d'intrusion, l'ouverture d'une porte provoque un mouvement de l'air ambiant qui peut être mis en évidence par la réaction d'une autre porte qui aurait été préalablement ouverte.Taking an example related to intrusion detection, the opening of a door causes movement of the ambient air which can be highlighted by the reaction of another door which would have been previously opened.

La forme d'onde correspondante peut être assimilée à l'oscillation d'un circuit très amorti.The corresponding waveform can be compared to the oscillation of a highly damped circuit.

Ce déplacement peut être détecté par un appareil réagissant aux variations de pression et transformant celles-ci en signal électrique exploitable dans la bande de fréquence utile tel qu'un microphone piézo-électrique, dynamique, à condensateur, électromagnétique, ou autres, ou un capteur de pression à jauge de contrainte, à capsule manométrique; à microphone, à condensateur, etc...This displacement can be detected by a device reacting to pressure variations and transforming them into an electrical signal usable in the useful frequency band such as a piezoelectric, dynamic, condenser, electromagnetic, or other microphone, or a sensor. pressure gauge strain, with pressure capsule; with microphone, condenser, etc ...

Il existe déjà différents moyens permettant de détecter et de signaler des intrusions, parmi lesquels on peut citer ceux décrits dans les brevets :

  • - FR-A-972.292, ayant pour objet des détecteurs d'infra-sons et avertisseurs et leur application à la détection d'ouvertures de portes et de fenêtres, concernant des détecteurs à flamme à sensibilité réglable, associés à une cellule photo-électrique détectant les variations produites dans la flamme sous l'effet des infra-sons, et un détecteur d'infra-sons à chambre manométrique dans lequel une chambre à grand volume est fermée par une membrane dont les oscillations sont transmises électromagnétiquement à un amplificateur commandant un relais de signalisation. Le principe de ces appareils repose sur la détection des composantes à très basse fréquence par des dispositifs comportant des bandes de résonnance de même ordre, afin de porter la sensibilité à un degré aussi élevé que possible.
  • - BE-A-687.478, ayant pour objet un système de détection électrique qui se caractérise principalement en ce qu'il est destiné à la protection des chambres fortes ou analogue, par captation, au moyen de transducteurs, des vibrations engendrées dans une paroi lors d'une tentative d'effraction.
  • - US-A-3.854.129, concernant un détecteur infrasonique d'intrusion mettant en oeuvre un piston dont l'énergie nécessaire au déplacement est fonction des variations de pression apparaissant dans un local. Cette variation d'énergie est utilisée pour actionner une alarme.
  • - FR-A-2.523.339, ayant trait à un dispositif de détection à capteur volumétrique à infra-sons et procédé de détection par infra-sons, caractérisé en ce qu'il comporte un capteur d'infra-sons en dessous du domaine sonore, constitué d'un moyen faisant office de capteur de pression ou de variation de pression, tel qu'un microphone ou tout autre type de capteur de pression relative ou absolue du type piézo-électrique, dynamique, à condensateur ou électromagnétique ne réagissant qu'aux infra-sons. Le signal fourni par le détecteur déclenche une alarme après amplification et élimination des signaux de fréquences audibles ou plus élevées.
There are already different ways to detect and report intrusions, among which we can mention those described in patents:
  • - FR-A-972.292, concerning infrared detectors and alarms and their application to the detection of door and window openings, relating to flame detectors with adjustable sensitivity, associated with a photoelectric cell detecting the variations produced in the flame under the effect of infrasound, and an infrared detector with a manometric chamber in which a large-volume chamber is closed by a membrane whose oscillations are transmitted electromagnetically to an amplifier controlling a signaling relay. The principle of these devices is based on the detection of very low frequency components by devices comprising resonance bands of the same order, in order to bring the sensitivity to a degree as high as possible.
  • - BE-A-687.478, having for object an electrical detection system which is mainly characterized in that it is intended for the protection of vaults or the like, by capture, by means of transducers, of the vibrations generated in a wall during of an attempted break-in.
  • - US-A-3,854,129, relating to an infrasonic intrusion detector using a piston whose energy required for displacement is a function of pressure variations occurring in a room. This energy variation is used to activate an alarm.
  • - FR-A-2.523.339, relating to a detection device with infrared volumetric sensor and method of detection by infrared, characterized in that it comprises an infrared sensor below the domain sound, consisting of a means acting as a pressure or pressure variation sensor, such as a microphone or any other type of relative or absolute pressure sensor of the piezoelectric, dynamic, condenser or electromagnetic type reacting only 'to infra-sounds. The signal supplied by the detector triggers an alarm after amplification and elimination of signals of audible or higher frequencies.

Le dispositif décrit dans les brevets FR-A-972.292 et US-A-3.854. 129 présentent l'inconvénient de faire appel à des sytèmes thermodynamique ou mécanique peu fiables, encombrants, manquant de stabilité et de sensibilité et offrant une certaine rigidité fonctionnelle.The device described in patents FR-A-972,292 and US-A-3,854. 129 have the drawback of using thermodynamic or mechanical systems which are unreliable, bulky, lacking in stability and sensitivity and offering a certain functional rigidity.

Le dispositif décrit dans le brevet BE-A-.687.478 est limité à la détection de tentative d'effraction mécanique sur des portes ou parois de coffres-forts ou de chambres fortes, ce qui constitue un domaine particulier de la détection situé en aval de l'intrusion.The device described in patent BE-A-.687.478 is limited to the detection of attempted mechanical break-in on doors or walls of safes or vaults, which constitutes a particular area of detection located downstream of the intrusion.

Le dispositif décrit dans le brevet FR-A-2.523.339, s'il présente indéniablement des avantages de compacité, de sensibilité et de fiabilité, offre cependant l'inconvénient d'utiliser des capteurs ne réagissant qu'aux infra-sons et de nécessiter l'adjonction d'un moyen destiné à éliminer les signaux de fréquences audibles ou plus élevées, ce qui complique l'ensemble.The device described in patent FR-A-2,523,339, although it undeniably has advantages of compactness, sensitivity and reliability, however has the drawback of using sensors which react only to infra-sounds and of require the addition of a means to eliminate signals of audible or higher frequencies, which complicates the whole.

Le détecteur d'accès à pression différentielle selon l'invention, vise à remédier aux inconvénients des dispositifs cités ci-dessus, tout en offrant les avantages complémentaires suivants :

  • - adaptation d'indépendance, d'amplification et de filtrage, permettant de délivrer un signal calibré correspondant à l'application souhaitée.
  • - détection des variations de pression de très basse fréquence pour la détection de variations de pression lente ou de la présence d'infra-sons, et de basse fréquence pour la détection de bruits caractéristiques.
  • - réglable spécialement pour des utilisations particulières.
  • - prise en compte d'autres caractéristiques que la fréquence telles que la durée, l'enveloppe, l'amplitude, etc..., dans un but décisionnel avant commande du relais de signalisation.
  • - bande passante exploitable dans l'infra-son.
  • - l'ampli-filtre a des fréquences de coupure rapides éliminant les signaux parasites. Selon une variante, la fréquence de coupure peut-être pilotée extérieurement à l'ampli.
  • - le moyen de traitement de l'information utilisé, permet le comptage des événements, l'intégration de l'énergie captée, la comparaison à seuil fixe ou réglable et la prise de décision. Selon une variante, une programme de calcul permet de reconstituer le signal utile par élimination des composants parasites et identification à des modèles programmes, l'apprentissage de modèles à reconnaître et la prise en compte de paramètres d'ambiance en vue de la correction des calculs.
  • - il peut être commandé à distance par un émetteur de signaux portatif.
The differential pressure access detector according to the invention aims to remedy the drawbacks of the devices mentioned above, while offering the following additional advantages:
  • - adaptation of independence, amplification and filtering, making it possible to deliver a calibrated signal corresponding to the desired application.
  • - detection of very low frequency pressure variations for the detection of slow pressure variations or the presence of infra-sounds, and of low frequency for the detection of characteristic noises.
  • - specially adjustable for specific uses.
  • - taking into account other characteristics than the frequency such as duration, envelope, amplitude, etc ..., for a decisional purpose before command of the signaling relay.
  • - exploitable bandwidth in infrared.
  • - the ampli-filter has fast cut-off frequencies eliminating spurious signals. According to a variant, the cut-off frequency can be controlled externally to the amplifier.
  • - the information processing means used, allows counting of events, integration of the energy captured, comparison with fixed or adjustable threshold and decision-making. According to a variant, a calculation program makes it possible to reconstruct the useful signal by elimination of the parasitic components and identification with program models, learning of models to be recognized and taking into account ambient parameters with a view to correcting the calculations. .
  • - it can be controlled remotely by a portable signal transmitter.

Cet appareil se caractérise principalement en ce qu'il utilise comme capteur, un microphone à électret, en ce qu'il comprend un ampli-filtre à fréquences -de coupure rapides éliminant les signaux parasites, en ce que le traitement du signal s'effectue par un moyen logique.This device is mainly characterized in that it uses as a sensor, an electret microphone, in that it includes an amplifier-filter with fast cut-off frequencies eliminating parasitic signals, in that the signal processing is carried out by logical means.

L'ampli-filtre est à commutation de capacité et sa fréquence de commutation peut être pilotée extérieurement.The amplifier filter is capacity switching and its switching frequency can be controlled externally.

Le moyen logique utilisé est une logique câblée ou un microprocesseur combiné à un convertisseur analogique numérique.The logic means used is wired logic or a microprocessor combined with an analog-to-digital converter.

D'autres caractéristiques et avantages apparaîtront dans la description qui va suivre d'un détecteur d'accès à pression différentielle selon l'invention, donné à titre d'exemple non limitatif, au regard des dessins annexés représentant :

  • Figure 1, le schéma bloc du système.
  • Figure 2, un schéma synoptique du système.
Other characteristics and advantages will appear in the following description of a differential pressure access detector according to the invention, given by way of nonlimiting example, with regard to the appended drawings representing:
  • Figure 1, the system block diagram.
  • Figure 2, a block diagram of the system.

On remarque, en examinant successivement ces schémas, que l'appareil est constitué d'un capteur 1, d'une adaptation 2, d'un moyen de traitement 3 du signal fourni par l'adaptation et d'une signalisation 4.It will be noted, by examining these diagrams successively, that the device consists of a sensor 1, of an adaptation 2, of a means 3 for processing the signal supplied by the adaptation and of a signaling 4.

Le moyen de traitement 3 du signal fourni par l'adapteur 2, est constitué d'un détecteur 5 d'alternance + et - commandant un intégrateur d'énergie 6, lequel est relié à un comparateur à sensibilité réglable 7 connecté à un moyen de prise de décision 8. Le détecteur + et - est relié au moyen de prise de décision 8, respectivement par l'intermédiaire d'un dispositif de comptage 9, d'un moyen d'intégration de la durée 10 et d'un comparateur 11, et d'une temporisation 12.The signal processing means 3 provided by the adapter 2, consists of a alternation + detector 5 and - controlling an energy integrator 6, which is connected to an adjustable sensitivity comparator 7 connected to a means of decision-making 8. The + and - detector is connected to the decision-making means 8, respectively via a counting device 9, a time integration means 10 and a comparator 11 , and a time delay 12.

Le moyen de signalisation 4 comprend une commande par relais 13 et un dispositif de contrôle de l'utilisation 14.The signaling means 4 comprises a relay control 13 and a usage control device 14.

Le capteur 1, fournissant un signal électrique exploitable dans la bande de fréquences utile est, selon un mode de réalisation préférentiel, constitué d'un microphone à électret dont la bande passante est exploitable.The sensor 1, providing an exploitable electrical signal in the useful frequency band is, according to a preferred embodiment, consisting of an electret microphone whose passband is exploitable.

L'adaptateur 2 est un ampli-filtre à fréquences de coupure rapides, éliminant les signaux parasites, qui, selon un mode de réalisation préférentiel, est un ampli-filtre à commutation de capacité pilotable extérieurement.Adapter 2 is an amplifier with fast cut-off frequencies, eliminating parasitic signals, which, according to a preferred embodiment, is an externally controllable capacitance switching amplifier filter.

Le traitement de l'information s'effectue par l'intermédiaire d'une logique câblée permettant le comptage des événements, l'intégration de l'énergie captée, l'intégration de la durée et la temporisation.Information processing is carried out by means of a wired logic allowing the counting of events, the integration of the energy captured, the integration of duration and timing.

Le comparateur 2, relié à l'intégrateur de durée 10, est à seuil fixe ou réglable.Comparator 2, connected to the duration integrator 10, has a fixed or adjustable threshold.

Selon un mode de réalisation préférentiel de l'invention, le traitement s'effectue par l'intermédiaire d'un microprocesseur avec convertisseur analogique digital et de programme de calcul permettant la reconstitution du signal utile et l'élimination des composantes parasites, ainsi que l'identification des modèles prépro- grammes, l'apprentissage de modèles à reconnaître et la prise en compte de paramètres d'ambiance pour une correction des calculs. La signalisation s'effectue par l'intermédiaire de relais, d'une liaison par photo-couplage, ou tous autres moyens.According to a preferred embodiment of the invention, the processing is carried out by means of a microprocessor with digital analog converter and of calculation program allowing the reconstruction of the useful signal and the elimination of the parasitic components, as well as the 'identification of preprogram models, learning of models to be recognized and taking into account ambient parameters for a correction of the calculations. Signaling takes place via relays, a photo-coupling link, or any other means.

Ainsi, comme on le voit, en se reportant à nouveau au schéma 2, après amplification et élimination des bandes de fréquences parasites, le signal fourni par le capteur 1, est dirigé simultanément vers le détecteur d'alternance 5 et vers l'intégrateur d'énergie en valeur absolue 6. La sortie du détecteur d'alternance 5 commande l'intégrateur d'énergie 6, en vue de quantifier le signal et de le comparer à une valeur prédéterminée réglable par l'intermédiaire d'un réglage de sensibilité. Le détecteur d'alternance 5 commande la temporisation 12 et le compteur d'événements 9, dont les sorties valident un fonctionnement normal. La temporisation 12 détermine le moment de la prise de décision.Thus, as can be seen, by referring again to diagram 2, after amplification and elimination of the parasitic frequency bands, the signal supplied by the sensor 1 is directed simultaneously to the alternation detector 5 and to the integrator d energy in absolute value 6. The output of the alternation detector 5 controls the energy integrator 6, with a view to quantifying the signal and comparing it to a predetermined value adjustable by means of a sensitivity adjustment. The alternation detector 5 controls the time delay 12 and the event counter 9, the outputs of which validate normal operation. The time delay 12 determines the moment of decision-making.

La commande du relais de signalisation par le circuit décisionnel 8, est donc fonction des valeurs de comptage d'événements, de la durée des événements, de l'énergie reçue et du délai d'analyse.The control of the signaling relay by the decision-making circuit 8 is therefore a function of the event count values, the duration of events, energy received and analysis time.

Ce détecteur est destiné principalement à être utilisé dans le domaine de la sécurité, mais il peut être adapté à d'autres usages concernant notamment la sécurité des personnes et des biens et le contrôle d'accès et de passage en combinaison avec un émetteur de signaux sonores portatif.This detector is mainly intended to be used in the security field, but it can be adapted for other uses concerning in particular the security of people and goods and access and passage control in combination with a signal transmitter portable sound systems.

Claims (3)

1. Détecteur d'accès à pression différentielle dont le moyen logique de traitement du signal est un microprocesseur associé à un convertisseur analogue numérique caractérisé en ce que le moyen logique de traitement du signal est assorti de programmes de calcul permettant la reconstitution du signal utile, l'élimination des composantes parasites, l'identification de modèles préprogrammés, l'apprentissage de modèles préprogrammés , l'apprentissage de modèles à reconnaitre et la prise en compte de paramètre d'ambiance pour la correction des calculs et en ce que les signaux sonores de fréquences parasites sont éliminés par l'intermédiaire d'un ampli-filtre à fréquences de coupure rapides.1. Differential pressure access detector, the logic signal processing means of which is a microprocessor associated with an analog digital converter, characterized in that the logic signal processing means is accompanied by calculation programs allowing the reconstruction of the useful signal, elimination of parasitic components, identification of preprogrammed models, learning of preprogrammed models, learning of models to be recognized and taking into account the ambient parameter for the correction of the calculations and in that the sound signals parasitic frequencies are eliminated via an amplifier with fast cut-off frequencies. 2. Détecteur d'accès à pression différentielle selon la revendication 1 caractérisé en ce que l'ampli-filtre à fréquences de coupure rapides est à commutation de capacité à fréquence pilotée de l'extérieur.2. A differential pressure access detector according to claim 1 characterized in that the amplifier with fast cut-off frequencies is capacity switching with frequency controlled from the outside. 3. Détecteur d'accès à pression différentielle selon la revendication 1 caractérisé en ce que le comparateur relié à l'intégrateur de durée est à seuil ajustable.3. Differential pressure access detector according to claim 1 characterized in that the comparator connected to the duration integrator is with adjustable threshold.
EP85400411A 1984-03-05 1985-03-04 Differential pressure access detector Expired EP0159218B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400411T ATE39774T1 (en) 1984-03-05 1985-03-04 DIFFERENTIAL PRESSURE ACCESS DETECTOR.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8403501A FR2560701B1 (en) 1984-03-05 1984-03-05 DIFFERENTIAL PRESSURE ACCESS DETECTOR
FR8403501 1984-03-05

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EP0159218A1 true EP0159218A1 (en) 1985-10-23
EP0159218B1 EP0159218B1 (en) 1989-01-04

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AT (1) ATE39774T1 (en)
DE (1) DE3567298D1 (en)
FR (1) FR2560701B1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
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FR2589609A1 (en) * 1985-10-31 1987-05-07 Frere Emmanuel Alarm device, especially for premises surveillance
EP0357539A2 (en) * 1988-08-03 1990-03-07 Rabbit Systems, Inc. Infra-sonic detector and alarm with self adjusting reference
GB2231660A (en) * 1989-03-02 1990-11-21 David Mainprize Detecting entry into an enclosed space from air pressure changes
GB2234068A (en) * 1989-03-13 1991-01-23 * Mistry Chand Infra-sonic detectors for use in alarm systems
FR2694650A1 (en) * 1992-08-04 1994-02-11 Frizet Christian Parametric analyser for intruder detector using pressure sensor - includes microprocessor for memorising and comparing signals in order to set detection thresholds and sense abnormal signals
WO2001088870A1 (en) * 2000-05-18 2001-11-22 F And F International S.A.R.L. Self-adjusting alarm device with low energy consumption
US6720875B2 (en) 2000-05-18 2004-04-13 F And F International S.A.R.L. Self-adjusting alarm device with low energy consumption

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Publication number Priority date Publication date Assignee Title
FR2588108A1 (en) * 1985-09-27 1987-04-03 Durand Michel Active perimeter break-in detector
DE3579461D1 (en) * 1985-10-14 1990-10-04 Microprotector Ltd DETECTOR AND ALARM SYSTEM.
FR2596179A1 (en) * 1986-03-18 1987-09-25 Smcm Intruder detection system, applicable especially to an alarm system
EP0726548B1 (en) * 1995-02-13 2004-07-21 Siemens Building Technologies AG Sonic detector for monitoring intrusions
FR2770670A1 (en) * 1997-11-03 1999-05-07 Omega Conception Et Systeme Sound detector alarm

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Cited By (10)

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FR2589609A1 (en) * 1985-10-31 1987-05-07 Frere Emmanuel Alarm device, especially for premises surveillance
EP0357539A2 (en) * 1988-08-03 1990-03-07 Rabbit Systems, Inc. Infra-sonic detector and alarm with self adjusting reference
EP0357539A3 (en) * 1988-08-03 1990-03-14 Rabbit Systems, Inc. Infra-sonic detector and alarm with self adjusting reference
US4991145A (en) * 1988-08-03 1991-02-05 Rabbit Systems, Inc. Infra-sonic detector and alarm with self adjusting reference
GB2231660A (en) * 1989-03-02 1990-11-21 David Mainprize Detecting entry into an enclosed space from air pressure changes
GB2234068A (en) * 1989-03-13 1991-01-23 * Mistry Chand Infra-sonic detectors for use in alarm systems
FR2694650A1 (en) * 1992-08-04 1994-02-11 Frizet Christian Parametric analyser for intruder detector using pressure sensor - includes microprocessor for memorising and comparing signals in order to set detection thresholds and sense abnormal signals
WO2001088870A1 (en) * 2000-05-18 2001-11-22 F And F International S.A.R.L. Self-adjusting alarm device with low energy consumption
FR2809215A1 (en) * 2000-05-18 2001-11-23 F And F Internat House intruder acoustic pressure alarm having pressure detector/amplifiers and comparator with self adjustment circuit and variable pulse lengths microprocessor controlled setting variable threshold alarm
US6720875B2 (en) 2000-05-18 2004-04-13 F And F International S.A.R.L. Self-adjusting alarm device with low energy consumption

Also Published As

Publication number Publication date
FR2560701B1 (en) 1987-04-17
DE3567298D1 (en) 1989-02-09
ATE39774T1 (en) 1989-01-15
FR2560701A1 (en) 1985-09-06
EP0159218B1 (en) 1989-01-04

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