Pyroelectric IR Motion Sensor Angular Position Detection

The system divides a single sensor function into multiple PIR sensors arranged in an array, where each sensor detects IR radiation from different angular positions. The Fresnel lens is also segmented into multiple lenslets, each directing radiation to specific sensors. This segmentation enables angular position determination through pattern matching across the sensor array, resolving the contradiction between measurement precision and device complexity.

The patent transitions from a single-point detection (0D) to a multi-point spatial array (1D/2D), adding dimensional information to the detection system. By arranging sensors in an array and using a Fresnel lens with multiple lenslets, the system captures spatial distribution of IR radiation, enabling angular position and proximity estimation that was impossible with a single sensor.

The system implements feedback through pattern matching algorithms that compare detected angular position patterns against expected patterns for genuine targets. By continuously monitoring the spatial distribution of signals across the sensor array and comparing against trained patterns, the system can distinguish genuine targets from false alarm sources, improving reliability while managing processing complexity through efficient pattern recognition.

The patent applies preliminary action by pre-training pattern matching algorithms with training data before actual detection. The system pre-establishes patterns of angular position features for different target scenarios, enabling rapid and reliable classification during operation without requiring complex real-time analysis, thus improving reliability while controlling processing complexity.