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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
Occupancy sensor types include: PIR sensors, which work on heat difference detection, measuring infrared radiation.Inside the device is a pyroelectric sensor which can detect the sudden presence of objects (such as humans) who radiate a temperature different from the temperature of the background, such as the room temperature of a wall.
In the case that the home is not occupied, the thermostat can suspend heating/cooling until the sensor is reactivated by an occupant. This sensor is also used to determine the occupancy patterns to create the auto schedule. A grille member is placed in front of the sensor to visually conceal and protect the PIR motion sensor inside the thermostat.
PIR sensors identify abrupt changes in temperature at a given point. As an intruder walks in front of the sensor, the temperature at that point will rise from room temperature to body temperature and then back again. This quick change triggers the detection. PIR sensors designed to be wall- or ceiling-mounted come in various fields of view ...
For example, additional volumetric sensors can be added to confirm what the PIR sensor is seeing (called Dual-Tech sensors). I use "quad element" sensors, which have a higher immunity to false alarms (from manufacturer's claimed, and experience), and I guess they have four sensors in one housing but I don't really know.
Prototype of high-speed infrared detector installed on the PIONIER instrument at ESO’s Paranal Observatory. [1]An infrared detector is a detector that reacts to infrared (IR) radiation.
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A sound discriminator or glass breakage sensor senses only the sound of glass breaking. Typically, a sound discriminator sensor can be eliminated using a shock sensor. Proximity, infrared, or motion sensors sense motion inside or outside the vehicle; these are typically installed on convertible or T-top vehicles.
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