How do glass break sensors augment overall home security?
Door and window sensors get activated only if the door or window is opened. However, if someone attempts to break into a home by breaking or shattering a glass door or window, the contact sensors will not detect this. The burglar can gain entry into the home by climbing in or walking through the broken glass window or door.
Motion detectors set the alarm off when the intruder is already inside the home. Glass break sensors do this even before the intruder gets inside.
When the motion sensors are turned off (such as at night when family members are in the home, moving about), glass break sensors offer back-up protection.
There are two main types of glass breaking sensors:
- Shock sensors detect the vibrations generated by breaking glass. The problem with these is that many things causing vibrations, other than shattering glass,are picked up – such as a door being slammed. In order to detect the vibrations, the sensors are installed directly to the specific window to be monitored; therefore, a glass break sensor needs to be installed for every window to be protected.
- Acoustic sensors are triggered by sound waves, picking up the actual frequency of broken glass with an audio microphone. These are mounted on walls or ceilings and not on the window itself.With a clear line of sight between the sensor and the window, acoustic sensors are effective within a 30-40 feet radius and some have up to 360 degrees horizontal sensing angle. A large room ? its door/s and many windows – can therefore be well covered by one acoustic glass break sensing device.
Glass break sensors which are triggered by the sound of breaking glass are known as Single Technology sensors. Some home security system companies, such as Vivint, offer the more advanced Dual Technology sensors, monitoring the two stages of breaking glass by combining vibration and sound detection. These are said to significantly reduce likelihood of false alarms.
Glass break sensors are cost efficient. One sensor protects not just one, but a group of windows in a room. They are a first line of defense against intrusion ? stopping burglars in their tracks and thus help prevent break-ins from even materializing. By incorporating glass break sensors in the alarm system and coupled with other sensors, a fuller, more robust home protection is achieved.