APD-based Laser Range-Gating System

One of the most important things to have in almost every aspect is security. Everyone in this world seeks security in any and every way possible. One of the ways is to also ensure the security for home during the night from all types of intruders. This proposed system is one of the surveillance systems that help in the detection of any intruders that may enter with the help of laser and gating technologies. Using this system, it is possible to detect intruders who are even traveling at high speeds. Here, a laser source is available all the time. When an intruder meets the laser light, immediately the available buzzer is turned on, and it captures the sense of the intruder. When a target meets the laser source, the laser signal is reflected, and an Avalanche Photo Detector detects the reflected signal. A delayed transmitted laser source signal is generated to synchronize the timing pulse. This type of exposure is known as a gate. With the synchronized gated pulse, the output signal is used to capture the target. This entire process will take place in the order of nanoseconds. The system is connected to ON the camera which is utilized for military surveillance purposes.