Presence detector (lighting)
Introduction
Particularly, the infrared sensor is an optoelectronic device capable of measuring the infrared electromagnetic radiation of bodies in its field of vision.
All bodies emit "Emission (physics)") a certain amount of radiation, this is invisible to our eyes but not to these electronic devices, since they are in the range of the spectrum just below visible light.
Operating principles
Contenido
Los rayos infrarrojos (IR) entran en el fototransistor donde encontramos un material piroeléctrico, natural o artificial, normalmente formando una lámina "Lámina (objeto)") delgada dentro del nitrato de galio [Ga(NO3)3], nitrato de Cesio (CsNO3), derivados de la fenilpirazina, y ftalocianina de cobalto.
Normalmente están integrados en diversas configuraciones (1,2,4 píxeles de material piroeléctrico). En el caso de parejas se acostumbra a dar polaridades opuestas para trabajar con un amplificador diferencial, provocando la auto-cancelación de los incrementos de energía de IR y el desacoplamiento del equipo.
Spectral distribution[1]
A spectral distribution graph is a visual representation of the spectrum of light produced by a light source. Light is an electromagnetic wave, and as such has a certain wavelength.
Passive sensors
They are made up only of the phototransistor with the task of measuring the radiation coming from objects.
Active sensors
They are based on the combination of an emitter and a receiver close to each other; they are normally part of the same integrated circuit. The emitter is an infrared LED diode (IRED) and the receiving component is the phototransistor.