Terms And Definitions - Abus FUBW50120 Instructions D'installation Et D'utilisation

Introduction

Terms and definitions

PIR Passive infrared or pyroelectric infrared sensor
Amongst other things, PIR sensors are used in motion detectors to detect the
thermal radiation emitted, e.g. by living beings like humans, from up to one
metre away. This can trigger various actions, such as an alarm message.
The sensor reacts to small changes in temperature, e.g. when a person passes
by.
The sensor works best when movement is transverse to the detector.
IR Infrared
Heat emission in the infrared spectral range
Infrared radiation is often equated with thermal radiation, even though both
microwaves and visible light, like the entire electromagnetic spectral range,
cause a rise in temperature.
In physics, infrared radiation is electromagnetic radiation that lies between
visible light and long-wave terahertz radiation in the spectral range. Infrared
therefore usually refers to light with a wavelength between 1 mm and 780 nm.
This corresponds to a frequency range of 300 GHz to 400 THz.
Application:
PIR detector technology
Electronics
Infrared remote control, optocouplers and most light barriers work in the near-
infrared range at wavelengths of 880–950 nm as that is where silicon
photodiodes and phototransistors are the most sensitive. Infrared interfaces in
electronic technology also mostly work within these wavelength ranges and
enable wireless communication with peripheral devices (e.g. programming
components into the Terxon wireless extensions or into the WAM).
Pyroelectric A semiconductor sensor which is used to detect changes in temperature. PIR
sensor sensors are based on pyroelectricity, hence the name, which is a characteristic
of some piezoelectic semiconductor crystals. Here, a change in temperature ΔT
results in a measurable change in electric voltage. PIR sensors do not react to
certain temperature levels that remain constant over time like other temperature
sensors, but only to the change in temperature.
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