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Fig . 5 : Working of a PIR sensor
PIR sensors are popularly used for indoor occupancy detection due to their low cost , low energy consumption , large detection range , and wide field of view . They are commonly deployed with lighting systems to turn off lights in offices , conference rooms etc . when they do not detect movement for a defined period of time . However , while great at detecting motion , PIR sensors can only provide occupancy status in a binary status : occupied or not . They cannot tell how many people are in a certain area ( e . g ., conference room ) in any reliable fashion .
IR Cameras
An InfraRed Camera is a camera that detects infrared energy ( instead of visible light , as in a regular camera ) and turns that into a color-coded image of observed temperature gradients . An IR camera is equipped with a sensor chip that consists of a grid of small detectors . Each detector is able to detect the infrared energy , producing a signal that is then converted to a color that corresponds to the temperature . This color map is the resulting output of the camera viewing a specific area or environment 11 .
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