GB2015796A - Glass fracture detector - Google Patents

Glass fracture detector

Info

Publication number
GB2015796A
GB2015796A GB7906863A GB7906863A GB2015796A GB 2015796 A GB2015796 A GB 2015796A GB 7906863 A GB7906863 A GB 7906863A GB 7906863 A GB7906863 A GB 7906863A GB 2015796 A GB2015796 A GB 2015796A
Authority
GB
United Kingdom
Prior art keywords
glass
stylus
glass fracture
fracture detector
differentiator
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.)
Granted
Application number
GB7906863A
Other versions
GB2015796B (en
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.)
Chloride Group Ltd
Original Assignee
Chloride Group Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chloride Group Ltd filed Critical Chloride Group Ltd
Priority to GB7906863A priority Critical patent/GB2015796B/en
Publication of GB2015796A publication Critical patent/GB2015796A/en
Application granted granted Critical
Publication of GB2015796B publication Critical patent/GB2015796B/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

This invention relates to glass fracture detectors comprising a stylus 14 mounted on a piezo-electric flexure element 11 held in a clamp 12 on the sheet of glass 13, so that the stylus 14 is in point contact with the glass 13 optionally via an intermediate layer of material. A shock wave picked up by the stylus 14 causes the element 11 to produce an electrical signal which is taken over conductors 15 to an alarm circuit, which includes either a differentiator (18) for detecting the rate of rise of the loading edge of a shock pulse or a high pass or band pass filter (23), Fig. 3 (not shown). <IMAGE>
GB7906863A 1978-02-22 1979-02-27 Glass fracture detector Expired GB2015796B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7906863A GB2015796B (en) 1978-02-22 1979-02-27 Glass fracture detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB706978 1978-02-22
GB7906863A GB2015796B (en) 1978-02-22 1979-02-27 Glass fracture detector

Publications (2)

Publication Number Publication Date
GB2015796A true GB2015796A (en) 1979-09-12
GB2015796B GB2015796B (en) 1982-09-08

Family

ID=26241157

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7906863A Expired GB2015796B (en) 1978-02-22 1979-02-27 Glass fracture detector

Country Status (1)

Country Link
GB (1) GB2015796B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129592A (en) * 1982-07-02 1984-05-16 Paul Coleman Motion sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2129592A (en) * 1982-07-02 1984-05-16 Paul Coleman Motion sensor

Also Published As

Publication number Publication date
GB2015796B (en) 1982-09-08

Similar Documents

Publication Publication Date Title
FR2332679A1 (en) ELECTRICAL SIGNAL SEPARATOR DEVICE
AU4700279A (en) Electrical signal separating device
DE3585454D1 (en) DEVICE FOR PROCESSING AN IMAGE SIGNAL WITH TAPE COMPRESSION.
AU4320079A (en) Rip detector signal detection circuit
EP0036760A3 (en) Pressure responsive monitoring device for vacuum circuit interrupters
JPS5315159A (en) Signal processing device
DE2967024D1 (en) Device for separating an optical signal from the ambient light
ES458594A1 (en) Optical position sensor
IT1079930B (en) VIDEO SIGNAL PROCESSING CIRCUIT
DE3067699D1 (en) Data signal detection apparatus
JPS51120249A (en) Navigating signal processing device
DE2961378D1 (en) Threshold selection circuit suitable for a processing unit for the processing of video signals from an angle tracking device
IT7823719A0 (en) VIDEO SIGNAL PROCESSING CIRCUIT.
JPS5528697A (en) Digital signal error detecting circuit device
AU515577B2 (en) Video signal processing apparatus
GB2015796A (en) Glass fracture detector
JPS5324722A (en) Device for processing television signal
AU509436B2 (en) Optoelectronic detection apparatus
AU503870B2 (en) Multifrequency signal receiver reference signal circuit
AT381820B (en) SIGNAL PROCESSING CIRCUIT FOR VIDEO SIGNALS
IT1129700B (en) ESCAPE SENSOR FOR AN ELECTRONIC LIQUID ESCAPE SURVEILLANCE DEVICE
GB1538692A (en) Video signal processing circuit
JPS5383740A (en) Papper detector
JPS52133233A (en) Detected signal processing circuit
JPS5542496A (en) Acoustic wave electric device for reading or processing twoodimensional optical image

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee