Infrared
Infrared light refers to electromagnetic waves in the wavelength range from 880 nm to 950 nm.
But where exactly does the infrared light occur? The infrared part in daylight is about 40 %, in incandescent light even about 90 %.
A transmitter/receiver system in the infrared range can be used to transmit information. Fields of application are e.g. remote controls, motion detectors, wireless headphones or IR receivers at Interpreting equipment.
The Advantages of an infrared transmission are:
- No cables
- HiFi quality transmission and a relatively high speech intelligibility.
- Quick and easy installation
- No electromagnetic interference (transmission reliability).
- Limitation to closed rooms. Other equipment can be operated in parallel in adjoining rooms.
- If required, up to 32 channels/languages can be used simultaneously for transmission
- Reflection – and hardly any absorption on bright, smooth surfaces
And the Disadvantages:
- Strong absorption due to some dark curtains, wood paneling or untreated concrete walls.
- Interference from extraneous light (fluorescent lamps, incandescent lamps, daylight, stage spotlights, halogen lights) from approx. 2000 LUX.
- Interference from fluorescent lamps clocked with ballasts (38 kHz).
