A glass breakage detector ensures safety in buildings and homes simply by detecting illegal entry through glass windows and doors. These detectors generally use narrowband microphones to capture and analyze vibrations or acoustic signals produced during a glass breakage. The microphones are generally tuned to the frequencies of glass breakage which vary with the type of glass.
Typical glass breakage detector designs utilize a low-power microcontroller to perform the signal analysis in software. For more complex sound analysis such as frequency composition and peak values, several glass-break sounds are compared with the present profile using signal transforms such as DCT (Discrete Fourier Transform) and FFT (Fast Fourier Transform). A hardware filter is used to restrict the signal spectrum to a particular frequency. A glass breakage alert can be indicated by an onboard buzzer and an LED.
Let’s walk-through some reference designs on Glass-breakage detectors along with their complete documentation:-