Patent ID: 9367143
Filing Date: 2016-06-14
CPC Classification: G01J,G01S,G06F

Claim Text:
1. Sensor system for detecting a motion in a predefined direction of motion of an infrared light source, said sensor system comprising: at least one pair of infrared light sensors, said pair consisting of two infrared light sensors arranged side by side with respect to the direction of motion and thereby defining a sensor coverage zone determined by the distance between mutually distal ends of the infrared light sensors with respect to the direction of motion, wherein the infrared light sensors are configured to provide electrical signals having mutually opposite charge signs in response to exposure to infrared light from the infrared light source, for detecting the motion of the infrared light source, and a window between the infrared light source and the infrared light sensors, wherein the window is configured to pass the infrared light of the infrared light source onto the pair of infrared light sensors, wherein the pair of infrared light sensors is arranged at a predefined distance from the window and extends in the direction of motion such that the distance, a position of the pair of infrared light sensors relative to the window and a width of the window define a predetermined limit distance away from the window, at which each of the pair of the infrared light sensors has a respective full illumination zone which defines respective locations of the infrared light source from which the infrared light source fully illuminates only one of the infrared light sensors, and wherein the full illumination zones do not spatially overlap beyond the limit distance, and the width of the window is smaller than the sensor coverage zone in the direction of motion.