Towards preventing the false alarms in indoor physical intrusion detector system and the incorporation of intruder immobilizer system.

Indoor physical intrusion detector systems are rendered ineffective and inefficient if the frequency of false alarms is high. The sensor technology deployed and the sensor architecture implemented determines the sensitivity of the intrusion alarm systems and the rate of false alarms. Here we report the development of an innovative smart reliable, easily deployable, indoor physical intrusion detector and intruder immobilizer system for security applications. The developed device implements two ultrasonic sensors positioned strategically apart and combined by AND logic gate to detect only intruders and preventing false triggers. A gas canister containing lachrymatory agents is connected to the circuit in such a manner that a solenoid switch activates the discharging of the gas upon the enabling of the circuit when an intruder is detected. Through this arrangement, the intruder is rendered immobile and harmless before apprehension. The device also activates an alarm simultaneously to alert the users. The developed device creates a secured environment and is suitable for homes, apartments, banks, warehouses, supermarkets especially in low income countries of Africa.