A quadrant photodetector is an optoelectronic sensor created by combining four separate photodiodes within a single package. This sensor has the ability to detect which regions the incoming light falls on when it arrives from specific directions.
These photodiodes are placed on different sections on the sensor's surface and are connected to each other vertically and horizontally. The four photodiodes on the sensor's surface produce separate signals for each direction of the incoming light signal, which are used to determine the sensor's position. The sensor can also detect changes in the target's movement or position.