Glass Break Sensor Tutorial

By: Ari Erenthal, Published on Mar 21, 2017

Burglars often break glass windows to get into a house. Using glass break detectors in conjunction with alarm contacts is a good way to protect the entire perimeter of a building. In this note, we examine glass break detectors, including

  • Shock vs Acoustic - 4 differences contrasted
  • Sensor ratings - thickness, size, type
  • Types of glass - plate vs tempered vs wired vs laminate
  • Shock sensors explained
  • Video demonstration of shock sensors
  • Acoustic sensors explained
  • 6 factors affecting acoustic glass break detector performance

Shock ** ******** *******

*** *** **** ****** types ** ***** ***** sensors *** ***** *** acoustic. *** *** *********** are:

  • ********: ***** ** ******* to *** ***** ******* acoustic ** ******* ** a ******* ****** *** glass
  • ***********: ***** ******** *** physical ******** (*.*., *****) made ***** ******** ******* the ***** ** *** glass ********
  • ***** ****: ***** ** more ********* ******* ** requires ******** ** **** pane ******* ******** *** monitor ******** *****
  • ********: ***** ** **** accurate ***** ******** ***** alarms **** **********, ********** in ***** ************

Sensor ******* - ********* / **** / ****

******* *** ********* ***** by * *********** **:

  • ********* - *** ***** the ***** **
  • **** - *** ***** (width / ******) *** glass **
  • **** - **** **** of ***** ** ***** used

*** ****, *** * most ****** ***:

  • ***** ***** ** *** most ****** **** ** glass ***** ** *********** and ***** ********** *********. When ** ******, ** shatters **** ***** ****** with ****** *****, *********** by * **** *****. It ******* ****** ** no ********* **** ** breaks ******* ** ** so **********.
  • ******** *****, **** ***** as ****** *****, ** found ** ***** *****, architectural *******, ********* *****, and *** ***** ********* where * ****** ***** potentially **** **** *** shatter * ***** ***** of *****. ******* ** forming ***** ****** **** sharp, ****** *****, ** shatters **** **** ****** that ** **** ****** to ***** ****** ******. Tempered ***** ***** * much ******* ***** *** produces **** **** ***** when ******** **** ***** types ** *****.
  • ***** ***** *** **** threads ***** **, ** order ** ****** ***** and ********* **** ************. It ** ******** ***** in **** ***** *** industrial ************. **** ***** it ******, ********** **** equal, ** ****** ***** break.
  • ******** ***** ** *** layers ** ***** **** a ***** ** ******* sandwiched ******. *** ******* absorbs **** ** *** shock. ** **** *****, t*** ***** ** ******, everything **** *****, ** detect ***** *****.

*** *******, ** *** example *****, ****** *** the ************ *** ********* performance ***** ** **** thickness *** ****:

** ********, ** *** example *****, *** ************ specifies **** *** ******* size:

*** ************* ***** ****** be ******* *** **** model *** **** ** use *** ******** ** window ***** *******.

Shock *******

***** *******, ********* ************ ****, *** ******* ******** onto *** ***** ****** using ****** ***** ****. Inside ** * ********** on * ** (******** closed) *******. **** *** transducer ********* *****, *** circuit *****, ******* ** open **** ****** ** the *****. *** ****** shock ******* **** ********* for ***** ******** ******** the ****** ******** *** to ******* ******* ** low ****** ********, *** newer, ********** ***** ***** sensors *** **** ** distinguish *** ********* ******* of * ****** ********** from ***** ***** ** vibration, *** ******** *** shock **** ** ********** glass ** ****. ***** sensors *** ******** ** protect * ****** **** of *****. ** * window ** **** *** multiple ***** ** *****, each **** **** **** its *** ***** ******.

******* ***** ******* *** designed ** ****** *** shock **** **** *********** the ********** ** ** entire **** ** *****, it ****** ****** ****** or****** *****. * ***** ****** will *** **** ** a ******* **** * circular ****** ** **** a ****, ******** **** is********* ** ** *********** ********* ****. *******, a ******** ******** ***** system **** **** ******** contacts, **** ** ***** break *********, *** ******** sensors, **** ** ****** detectors, ** ********** **** other.

***** ******* ****** ** mounted ** *** ****** of *** ****** **** to **** ********. *** installation ****** **** ******* the ***** ******** **** the ****** *****, ******* 1 **** (*.***) **** the *****. *** ************ will **** ******* *** maximum ***** ********* *** detection **** ******, ******** 1/4" (*.****) ***** **** an *' (*.**) ** 10' (**) ******.

** **** * ***** sensor, ****** *** ***** in *** ******** ****** that *** ****** ** mounted **. *** * blunt ****** ** ******* object ** **** ****, such ** *** **** of ** ********* ***********. Testing * ***** ****** requires ******* *** ***** with ***** * *** of *****, *** ***** less ***** **** ** actually ********* ** * shattering ******.

Video ************* ** ***** *******

** **** ***** *****, we **** **** ***** sensors ****** ***** ****** even **** *** ****** is ******. **** **** the ****** ** ****** with ***** **** *** shock ****** ******* ** alarm:

Acoustic *******

** ******** ****** ******** of * **********, * transducer, *** ** **** microprocessor ********** **** *** sound ********* ** ********* types ** ***** ********. When ********** * **** with * ****** ** windows, ********** ********* ****** to ***** **** *** at **** ** ******** an ******** ***** ***** sensor ** *** ****. By ********* *** ************'* placement ************, ********** *** mount *** ****** ** a **** **** ***** as **** ******* ** possible ****** *** ******'* detection ****.

** ***** ** **** use ** ******** *******, installers ****** **** ** mind **** ***** ******* in *****. *** ***** of *** **** *** the ********* **** **** up **** **** ** going ** **** ** affect ** *** ***** waves ******, *** **** or **** ***** ***** travel **** *** ****** of *** ***** ** the ******** ******, *** how ********** *** ****** can ********* *** ****** those *****. *** *******, the ****** **** ********* a ***** *********** ** a **** **** **** of **** ******** **** in * **** **** lots ** **** ********, because *** **** ******** will ******* **** ** those ***** *** *** soft ******** **** ****** some ** ****.

**** ******* **** ********** sensitivity ******. ** ******** the ****** ** ***** alarms, *********** ****** ** turned **** ** ***** with ***** ********** ******** and ****** ** ** rooms **** ***** ********* surfaces. *******, ******, **** hangings, *** *********** ********* all ****** *****. **** paneling, **** ******, *** melamine ******* ********* *** reflect *****. *********** **** to ******* ***** ***** books ********** **** ** absorb **. **** ************* make ******** ******* **** adaptive ***************. ** * glass ***** ** ************ prone ** ***** ******, changing *** ****** ** one **** ******** **********, or * ****** **** another ************ **** ********* noise ********, *** **** prevent ****** ***** ******.

**** ************* **** * glass ***** *********, ***** is * ****** **** plays *** ***** ** different ***** ** ***** breaking. ***** * ***** break *********, ** ********* can ***** ** ******** glass ***** ******** ******* with * * **** battery *** *********** ***** it, ****** ********* ***** in ***** ** ********* the ******* ********* *** sensitivity ******. ***** ***** noise ******** ****** **** manufacturer ** ************, ** be **** ** **** a ****** **** * simulator **** *** **** manufacturer.

Hard ******** ******** ***** ******

**** ******** **** ** ceramic *****, ******, *** architectural ***** *** ******* normal ***** ** **** a *** **** *** be ************** ** ******** glass ***** *********. **** protecting ****** **** **** surfaces, ***** *** *********** of *** ********.

Dropping ******** ***** ******** ***** ******

**** ***** ********, ** creates * **** **** sound *** * **** pitched ***** ** *** same ****, *** ** for **** ****** ***** signature **** ******** ***** breaks *** ********* ***. Items **** ****** * multilayered ***** **** ******* can ** ************** ** glass ***** *********. **** dropped **** * ***** are ********* *** ******* off ***** ******. *** IPVM **** **** *** off * ***** ***** detector ********** * *** ** pretzels, ****** ** *** plastic ** *** ********* making * ***** **** sound **** *** ******** themselves. ***** *********** ****** be ***** ***** *** glass *****'* **** ** detection **, *** ** told ** ***** ********** tossing ****, *********, ***** supplies, ** ******* ******** objects ** **** **** while *** ***** ** armed.

Children ******* ********* ***** ******

********** ****** ** ******* when ********** ******** ***** break ********* ** *********, especially ********** ****. ******** often ************* *** *** acoustic ***** ****** ** rattling *** *****, ******** balls, *** ********* ***** kids. ** ********* ***** a ***** ***** ********* and * ******* ******* glass ***** ********, ** installer *** ******** *** exact **** ** ******* a ******** ** * way **** ******* * non ********* **** **** the *****. ** ** such **** *** ** found, ******-******* ***** ******* are *********** *******.

Humidity ****** ******** ******* ** ***********

******* *** ********** ****** an ******** ****** ******** a ***** *******, ******** sensors ****** *** ** used ** ********* **** regular **** ********, **** as *********.

Kitchens *** *********** ************ *** ******** *******

******** *** ******* ******* in **** ******** **** as ****, *****, *** metal. ******* ******, ****** chopping **********, *** ******* from ******** *** *** set *** ******** ***** break *********. * ***** break ********* ****** ** used ** ****** * practical ******** ******** ****. Humidity **** ***** *** dishwashers *** **** ***** acoustic ****** ************.

Drapes ***** ***** ***** *********

**** ******** ******* ****** penetrate ***** ******. ** possible, ***** * ***** mount ******** ****** **** no ******* ********* ******** in *** **** ***** the ****, ****** ********, between *** ****** *** the *****, *** ** medium ** *** ***********.

Comments (4)

Great article. I'm glad I made the investment in IPVM, it almost ensures I will learn something new every day.

great article ari!

  very informative !especially for me that i did not know about that high humidity issue with glass break detectors  

 

Very informative article, thanks Ari

Thanks for this.  I've been wondering about how GBD's and siren circuits work for years.

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