EP0281033A2 - Capteur de rupture - Google Patents

Capteur de rupture Download PDF

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Publication number
EP0281033A2
EP0281033A2 EP88102903A EP88102903A EP0281033A2 EP 0281033 A2 EP0281033 A2 EP 0281033A2 EP 88102903 A EP88102903 A EP 88102903A EP 88102903 A EP88102903 A EP 88102903A EP 0281033 A2 EP0281033 A2 EP 0281033A2
Authority
EP
European Patent Office
Prior art keywords
circuit
break sensor
fact
sensor according
signal
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.)
Withdrawn
Application number
EP88102903A
Other languages
German (de)
English (en)
Other versions
EP0281033A3 (fr
Inventor
Michele Campo
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0281033A2 publication Critical patent/EP0281033A2/fr
Publication of EP0281033A3 publication Critical patent/EP0281033A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/187—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interference of a radiation field

Definitions

  • This invention refers to a break sensor.
  • a break sensor that can be used to control a reflecting surface connected to a possible object to be broken open.
  • the sensor detects the stress or movements to which the object and reflecting surface are sub­mitted in the attempt to break them open.
  • alarm devices are specially designed for local applications, e.g. doors, windows and similar, but they also present various problems, among them the fact that they are rather vunerable.
  • the object of this invention is to provide a break sensor that does not present the above problems.
  • a break sensor without said pro­blems consists of six functional blocks suitably connected to one another, which make it possible to transduce the physical phenomenon under control in the switching of an electric con­tact.
  • any known device designed to generate an alarm signal can suitably control this electric contact.
  • the break sensor of this invention consists of: - a detector circuit (A), - an amplifier circuit (B), - an analyzing circuit (C), - a timing circuit (D), - a signal circuit (E) and - a power circuit (F) connected to one another to form a single circuit.
  • the detector circuit (A) comprises a photocoupler comprising a photodiode supplied by a resistor and a phototransistor supplied by a resistance divider with a filter formed by a resistor and capacity.
  • the amplifier circuit (B) comprises two operational ampli­fiers cascade-connected and de-coupled from a capacity.
  • the analyzing circuit (C) comprises two comparators of the type with signalling, connected in windowed discriminator, which signal the positive or negative variations of the sig­nal detected by the photocoupler.
  • the timing circuit comprises a condensor, resistors and a comparator.
  • Said circuit provides an intervention delay time of the sig­nals and a stop delay time of same.
  • the signal circuit comprises a relay, generally connected, whose contact is in open position during signalling.
  • Said relay may be fitted with a signal lamp.
  • the break sensor of this invention permits us to obtain the following results and advantages: the sensor is substantially based on a reflection type photo-coupling system, which, posi­tioned in front of a reflecting surface, permits us to detect any movement of the sensor with respect to said surface; the processing of the signal obtained from the isolating object makes it possible to distinguish even minimum variations of any body; the entire sensor, formed by different circuits with well pre-established functions, is substantially simple from the functional and constructive point of view, efficient and substantially economical.
  • the break sensor basically consists of six separate circuits, or blocks, each with a very precise function, each divided with dotted lines. Said circuits, or blocks, are: the detector circuit (A); the amplifier circuit (B); the analyzing circuit (C); the alarm signal timing circuit (D); the alarm signal circuit (E) and the power circuit (F).
  • Block A refers to the detector circuit. It is formed by the photo-coupler FA, which integrates a diode FD and a transistor FT with photo-electric characteristics.
  • the photo diode FD is supplied by the resistor Rd.
  • the photo transistor FT receives the power filtered by the capa­cities Cv and C1 by means of the resistor Ra, through the resistive part RT and Rt with annexed the input filter composed of the variable resistor P, the resistor R1 and the capacity C1.
  • Block B refers to the amplifier circuit and consists of the operational amplifiers ML1 and ML2, connected in cascade and de-coupled from the capacity CD, which produce, for high fre­quency band, a signal suitable for the following block.
  • the two amplifiers are cascade-connected with a gain at band centre of approximately 50 and a band type filtering preferivelyably comprised between 1 H z and 16 H z , with a central fre­quency of approximately 10 H z .
  • Block C refers to the analyzing circuit and is composed of the comparators ML3 and ML4, connected in windowed discri­minator, which produce, for positive and negative variations over a certain level of the abovementioned suitable signal, a signal effective for the following block.
  • Block D refers to the timing circuit and consists of the condensor G, the resistors Rc and RS and the comparator ML5 which produces, for short effective signals, a timed signal of at least one second for the following block.
  • Indication a in substance, for a time of preferably about 100 ms, detects any movements without triggering the alarm signal; this prevents intervention of the system for instan­taneous and involuntary movements produced by possible other accidental causes.
  • Block E refers to the alarm signal circuit and is formed by a U "reed” relay, generally connected, which opens its con­tact when the alarm signal arrives, and a red V “led", which can be cut out, which lights up when the alarm signal arrives.
  • the U relay connected to signal the alarm when its contact opens, is designed to intervene even when it is necessary to cut the connecting wires.
  • the U relay produces, stressed by the timed signal, the switching of the electric contact, which is displayed by the V LED, piloted by comparator ML6.
  • Block F has the function of correctly supplying all the cir­cuits of the previous blocks with power; it protects from reverse polarities by means of the diode D and resistor R, supplying power directly to blocks C, D and E.
  • the voltage regulator RV for example of type 78 L O 5, and the capacities C I , Ce and Ci, it supplies sta­bilized power to blocks A and B.
  • the hreak sensor of this inven­tion consists of a printed circuit plate, on which are placed all circuit parts described, apart from the photocoupler FA, which is connected to it by a special connecting cable (10). This permits this component to be placed near the devices to be protected, even if there is not much space.
  • the sensor of this invention operates like a reflection type photocoupler, which, positioned in front of a reflecting sur­face not mechanically linked to it, permits us to detect any even minimum movement (e.g. 0.5 mm) of the sensor with respect to said surface, providing this movement is conti­nuous.
  • the processing of the signal obtained from the isolating ob­ject permits us to distinguish the position variations of any body, e.g. a door, window, gate, roller gate or similar, submitted to impact, force, attempts to open and break them open, pressure or other undesired actions.
  • the photocoupler FA is preferably applied near the vertical bolts that slide longitudinally, controlled by the locks.
  • the reflecting surfaces SR On said bolts are prepared the reflecting surfaces SR, on which the photodiode FD sends the infra-red rays emitted, and from which the phototransistor FT receives the infra-­red rays on the rebound.
  • the remaining electronic system, or the other circuits, can be positioned in any other part of said doors or windows.
  • the bolts When the bolts are regularly driven by the locks, their longitudinal movement does not cause the intervention of the alarm system, as it does not detect faulty transversal movements.
  • the phototransistor FT de­tects the movement variation by means of the emission of infra-red rays and causes the intervention of the alarm system.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Optical Transform (AREA)
EP88102903A 1987-03-02 1988-02-26 Capteur de rupture Withdrawn EP0281033A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT19548/87A IT1203356B (it) 1987-03-02 1987-03-02 Sensore antiscasso
IT1954887 1987-03-02

Publications (2)

Publication Number Publication Date
EP0281033A2 true EP0281033A2 (fr) 1988-09-07
EP0281033A3 EP0281033A3 (fr) 1990-05-30

Family

ID=11158948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88102903A Withdrawn EP0281033A3 (fr) 1987-03-02 1988-02-26 Capteur de rupture

Country Status (2)

Country Link
EP (1) EP0281033A3 (fr)
IT (1) IT1203356B (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH568627A5 (fr) * 1974-07-15 1975-10-31 Cerberus Ag
DE2538242A1 (de) * 1975-08-28 1977-03-10 Rohue Rolladen Huebler Kg Anordnung zum sichern von durch rolladen uebergriffenen hausoeffnungen
FR2418504A1 (fr) * 1978-02-24 1979-09-21 Alsthom Cgee Panneau de fermeture mobile avec detecteur d'effraction
FR2504709A1 (fr) * 1981-04-28 1982-10-29 Alsthom Cgee Procede et dispositif detecteur de presence

Also Published As

Publication number Publication date
EP0281033A3 (fr) 1990-05-30
IT8719548A0 (it) 1987-03-02
IT1203356B (it) 1989-02-15

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