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radiation angle

The term Radiation Angle is used in the context of in a wide variety of techniques. For example, in the feeding of light into optical fibers, in acoustics in the radiation of sound waves from loudspeakers, in antenna technology and in lighting technology.

  1. In the case of light injection into optical fibers, the aim is to inject as much light energy as possible from the light source into the optical fiber. If the beam angle of the light source is too large, then the core glass is overfilled, as in Overfilled Launch( OFL), and light energy is lost for signal transmission.
  2. The sound radiation of loudspeakers is directionally sensitive for higher frequencies. For this reason, the radiation angle plays an important role in the arrangement of loudspeakers in baffles and loudspeaker cabinets, as this ensures optimum sound illumination of rooms or halls. The radiation angle and the resulting sound levels can be taken from the radiation pattern.
  3. Inantenna technology, the radiation angle is about the radiation pattern.
    Antenna diagram with main, side and back lobe

    Antenna diagram with main, side and back lobe

    It reflects the dependence of the field strength at a certain radiation angle. The radiation pattern and the radiation angle are specific to the design and range from isotropic radiation to directional antennas with extremely narrow-angled radiation.
  4. When illuminating rooms and halls with light-emitting d iodes, the beam angle is decisive. Light-emitting diodes are point sources with a limited beam angle. Their light emission is concentrated on a small semiconductor chip. Unlike conventional spotlights, which use reflectors to limit the light emission, LEDs use lenses to distribute the light. The beam angle of an LED luminaire is the solid angle at which the light is emitted into the room. The larger the beam angle and the further the distance to the is, the larger the light cone will be for the same luminous flux.
    Radiation angle of light-emitting diodes

    Radiation angle of light-emitting diodes

    By definition, the radiation angle is the angle at which the outermost light rays still have at least 50% of the luminous intensity. This angle is also known as the half-peak beam angle. In addition, there is also the field angle, which represents one tenth of the maximum luminous intensity. This is called One Tenth-Peak Beam Angle.
Englisch: radiation angle
Updated at: 08.09.2019
#Words: 368
Links: light, fibers, acoustics, radiation (R), sound
Translations: DE

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