A wide variety of glass break detecting systems are available in the global marketplace. While most of these available systems trigger alarms reliably in case the window panes are manipulated, they do not effectively or at all alarm when other ways in which the panes can be interfered are employed. To solve this issue, researchers from the Fraunhofer IPMS (Institute for Photonic Microsystems) and the Fraunhofer INT (Institute for Technological Trend Analysis) have designed a new variety of alarm system that is triggered by any attempt made to manipulate windows fitted with these systems. The new system records vibrations caused by external interferences with the window glass as well as temperature changes in real time.
Traditional designs of security glass have metal fibers that are broken in the case of mechanical damage, thus activating the alarm. When drills or cutting torches are used to break the glass, the alarm mechanism in conventional systems either does not react at all or reacts too late. Thieves exploit this drawback and use blowtorches or drills to break security glasses instead of using hammers.
The new system has been designed to overcome this challenge. It dynamically and rapidly keeps a record of the mechanical and thermal stress being put on the glass from external sources. The high effectiveness of the sensors in the system allow it to trigger an alarm even in the event of a gentle knock on the glass or the use of flame. The system uses fiber optic sensors for measurements because it uses light instead of electricity and the easily available option of fiber optics instead of the conventionally used copper wires in anti-burglary systems.