Security principle

Security door principle of sinusoidal oscillations produced by Crystal 3.5-4.95M, crossover frequency 7.6K sine wave, transistor power amplifier with the coil after the door panel (area 7) large coils of electromagnetic emission, 1-6 district receiving coil separately by the door. After receiving compares the received signal and the reference signal and found changes, change capture card output level, CPU the 280 milliseconds to scan the 6 regional acquisition card data, determine the location where the metal and the output displayed.

Second, structure 1, door structure: 1 large coil, 6 small coils, coils and graphite components of compensation. 2, chassis structure security doors

Third, a set of infrared detection work processes when CPU → stop → detect → alarm → acquisition card data for change detection another set of → reset back infrared detection.