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Glass Breakage Sensors and Range Check


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Teken 
Gold - Posts: 1,492
Gold spacespace
Joined: August 04, 2002
Location: Aruba
Posted: October 26, 2005 at 5:54 PM / IP Logged  
In the automotive scene, there are no longer any units which actually measure the (frequency) of broken glass. All of so called glass sensors simply pick up sound waves.
Now if it was a infrasonic, ultrasonic sensor, that would be different.
With respect to measuring the sound of breaking glass with a porcelin / ceramic tipped object, the sound is not the same, and the said sensor would also not detect such a breakage.
Regards
EVIL Teken . . .
Knowledge is power. But only if you apply that knowledge in a positive way, which promotes positive results in others.
EVIL Teken . . .
deepinit 
Member - Posts: 32
Member spacespace
Joined: September 18, 2005
Posted: October 26, 2005 at 8:55 PM / IP Logged  

Teken wrote:
In the automotive scene, there are no longer any units which actually measure the (frequency) of broken glass. All of so called glass sensors simply pick up sound waves.
Now if it was a infrasonic, ultrasonic sensor, that would be different.
With respect to measuring the sound of breaking glass with a porcelin / ceramic tipped object, the sound is not the same, and the said sensor would also not detect such a breakage.
Regards
EVIL Teken . . .

OK, so I am thinking that the DEI 506t Glass Sensor will trip under any sound like an engine starting or a radio playing.... is this correct?

On range (when I turned on range check) it just seems like the remote eventually reflects that its out of range where as before it would always reflect it was in range until a button is pressed.  I have yet to time the duration, but at this point its still inconclusive... more to come...

Teken 
Gold - Posts: 1,492
Gold spacespace
Joined: August 04, 2002
Location: Aruba
Posted: October 27, 2005 at 5:50 PM / IP Logged  
During a RS, most alarms bypass all sensors, except the ignition, hood, door, and brake pedal while the RS is armed.
To answer your Q, yes the sound of your engine could set it off, or any other noise(s) the sensor deems a threat.
Many systems ask the installer to rattle a set of keys on a ring, while others ask the installer to rap on the window to see the LED on the sensor, trip / activate.
Now, you dont have to be a genious to realize that neither procedure emmits the sound of broken glass.
So, in conclusion . . . Nothing wrong with having layers of protection, but dont get caught up in the hype that this device will detect the sound of broken glass, because it wont.
Regards
EVIL Teken . . .
Knowledge is power. But only if you apply that knowledge in a positive way, which promotes positive results in others.
EVIL Teken . . .
dualsport 
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Silver spacespace
Joined: September 27, 2005
Location: United States
Posted: October 27, 2005 at 6:13 PM / IP Logged  
They may be set up with at least some frequency discrimination, so it might be more sensitive to the higher frequencies which tend to be characteristic of breaking glass. The goal is that it's less sensitive to rumbling thunder or loud exhaust rolling by.
Can't be a foolproof scheme though, because sound in real life is made up of a continuous spectrum of frequencies, so loud sounds can exceed the threshold and set it off even if it's not breaking glass.
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