ABSTRACT
This chapter focuses on infrared (IR) sensors that complement and have similar architectures to radars (both have transmitters/receivers). It presents the feature extraction methods and machine learning algorithms tailored for each specific application. Radars are compared to IR sensors for similar mode of operation highlighting the pros and cons of each. IR sensors have the following two types: active IR sensor; and passive IR (PIR) sensor. The chapter considers PIR sensor. A PIR sensor only has a collector to sense the motion of the subjects in its field of view (FOV). Rather than sensing the motion, the PIR sensor detects the change in the amount of IR radiation impinging upon it. PIR sensors will be used to refer to dual-element type PIR sensors unless otherwise stated. PIR sensor-based indoor monitoring applications can be categorized into the following fields: home security and safety, home automation, and health status monitoring.
