GLASS BREAK DETECTOR-ATSS
A glass break detector is a sensor used in electronic burglar alarms that detects if a pane of glass is shattered or broken.These sensors are commonly used near glass doors or glass store-front windows to detect if an intruder broke the glass and entered.
Glass break detectors usually use a microphone, which monitors any noise or vibrations coming from the glass. If the vibrations exceed a certain threshold (that is sometimes user selectable) they are analyzed by detector circuitry.
Simpler detectors simply use narrowband microphones tuned to frequencies typical of glass shattering, and react to sound above certain threshold, whereas more complex designs compare the sound analysis to one or more glass-break profiles using signal transforms similar to discrete cosine transform (DCT) and fast Fourier transform (FFT) and react if both the amplitude threshold and statistically expressed similarity threshold are breached.
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Description
A glass break detector is a sensor used in electronic burglar alarms that detects if a pane of glass is shattered or broken.These sensors are commonly used near glass doors or glass store-front windows to detect if an intruder broke the glass and entered.
Glass break detectors usually use a microphone, which monitors any noise or vibrations coming from the glass. If the vibrations exceed a certain threshold (that is sometimes user selectable) they are analyzed by detector circuitry.
Simpler detectors simply use narrowband microphones tuned to frequencies typical of glass shattering, and react to sound above certain threshold, whereas more complex designs compare the sound analysis to one or more glass-break profiles using signal transforms similar to discrete cosine transform (DCT) and fast Fourier transform (FFT) and react if both the amplitude threshold and statistically expressed similarity threshold are breached.
Additional information
| Weight | 0.23 kg |
|---|---|
| Dimensions | 12 × 22 × 123 cm |
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The surface mount is as its name implies, mounted on the surface of the door/window with wiring exposed. A door contact is the most basic of alarm triggers.
These are just magnetic strips that are in contact while the door is closed but break the circuit when the door is opened. Then it triggers the alarm.
Surface Mount Magnetic Sensor are used on closed circuit alarm systems. These devices work through a magnets, so when the magnets are lines up, the switch is closed. These types of devices are meant to be an easy to install option for windows and doors that open. Below are the pros and cons of these devices and alternatives to using them.
Pros of Surface Mount Magnetic Door Contacts
Ease of installation: These devices are typically mounted through an adhesive that sticks to the door and the frame. They can also be mounted with wood or sheet screws depending upon your door or window you plan on installing it on.
Cheap: These devices are normally very cheap, the biggest cost with them is the installation and wiring if they are used on hardwired alarm systems.
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Cons of Surface Mount Magnetic Door Contacts
Visible: They are not aesthetically pleasing to the eye in residential settings.
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Recessed has the magnet placed in a 3/8″ hole drilled into the edge of the door,and the switch in another hole drilled into the door casing, wiring concealed in the wall.
Recessed Magnetic Door Sensors are typically used on closed circuit alarm systems. These devices work by magnets. These magnet sensors are mounted inside of the door and inside of the frame. When the door is closed and the magnets are lined up, the switch is closed. These devices are made to be ascetically pleasing, since they cannot been seen and also to be less prone to tampering. Below are the pros and the cons of using this type of door contact.
Pros of Recessed Magnetic Door Contacts
Less Risk of Tampering: since these devices are installed inside the door and frame they are far less likely to be tampered with since they cannot be seen when the door is closed. Invisible when door is closed: This makes for the devices to be more aesthetically pleasing than the surface mounted door contacts. These are the standard type of contacts used in residential settings for this reason.
Cons of Recessed magnetic Door Contacts
Harder to Install than surface contacts: Since they have to be installed the door and the frame, they are more difficult to install than the surface contacts which stick right onto the outside.
Alternatives
The other alternative to using recessed door contacts is to used surface door contacts. These are typically a little cheaper and easier to install than the recessed door contacts, but they are visible and more prone to tampering.
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