Scientists have developed a smart alarm that can set of an alarm system that recognises any attempt to break in, by detecting temperature changes or vibrations on windows in real time – leaving burglars with no chance. The new system quickly and dynamically records thermal and mechanical stresses from external causes.”We can adjust our system in a very fine-tuned, targeted manner. Even a gentle knock against the security glass or manipulation through the use of a flame is enough to trigger the alarm. If a cutting torch or a drill is used to damage the glass, conventional systems react either too late or not at all. If the changes are greater than a predefined threshold, signals are transmitted to the alarm system,” said Weinand.”If somebody exercises pressure on the glass pane or heats it, the distance between the grating elements changes, which in turn alters the transmitted wavelength,” said UdoWeinand, engineer at Fraunhofer Institute for Technological Trend Analysis INT.Conventional security glass contains metal threads that tear in the event of mechanical damage, activating the alarm.. As a result, it citrus juicer for sale can be adapted individually to the specific application,” said Peter Reinig, scientist at Fraunhofer Institute for Photonic Microsystems IPMS. Burglars exploit this weakness and use a drill or a blowtorch instead of a hammer.The window panes of jewellery stores, art galleries and banks are protected by alarm and fitted with security glass.”Sensitive optical measuring devices are capable of recording these changes.Researchers at Fraunhofer-Gesellschaft in Germany developed a smart anti-burglary protection system that overcomes this problem.
It can react to slight knocks and to strong ones.The smart alarm system was rigorously tested in various attack scenarios on a wide range of different security glass panes involving hammers, baseball bats, drills, firearms, axes and heat guns to determine when the alarm is reliably triggered.The sensor with the fibre Bragg grating is an optical sensor, which reflects a specific wavelength of light that is changed by deviations in temperature and/or elongation. However, the pane or part thereof has to break before the alarm is triggered.The fibre optics can be fitted in the corner of the windowpane or in other positions. This method of monitoring glass panes is based on a glass break sensor built inside an optical fibre by means of fibre Bragg grating, that is, optical interference filters inscribed in optical waveguides.The external force applied to the pane changes its mechanical characteristics, and the system detects this change.
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