What is IRID
Infrared (IR) light waves are a part of ordinary daylight, but can also be generated by light emitting diodes or incandescent lamps. The wavelength is about one micrometer (1/1 000 000 m) long, corresponding to a frequency of 300 THz (300·1012 Hz). This wavelength represents heat rather than light, in difference to the high-energy short-wavelength ultraviolet (UV) light at the other side of the light spectrum. Infrared waves are therefore friendly to the human body, just like daylight and light from the lamps that we have at home.
Thanks to their different nature, infrared waves propagate in a more controlled manner than radio signals. They are not easily reflected in metal, concrete or the like and pass through smoke, dust and ordinary glass without significant attenuation.
The Scirocco IRID systems comprise Readers, Tags, Energizers and Accessories. The systems make use of the latest inventions in infrared technology and are highly optimised in relation to performance, tolerance to demanding environments and coexistence with other systems.
Infrared light signals and lens technology are used for tag reading and writing, as well as to energize tags. The signals are generated by light emitting diodes (LEDs) and are specially coded to efficiently carry information, as well as to distinguish from other artificial light. Photo detectors with advanced optics are used to receive signals, where lens in reader is used to magnify the reading signals from tag, to precisely define the zone borders and to block light from other directions to reach the receiver. Transmitters and receivers are very compact, thanks to the fact that no antenna is used.
The tags have no battery. Instead, tag powering is made by light from the reader LEDs, from a separate long-life halogen lamp based energizer, or from ordinary daylight.
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