The hazard for the eye produced by extended sources depends on the size of the source and the imaging devices used between the source and the eye.
Formerly, the maximum permissible exposure was described in international standards such as IEC 825, by giving a limit value for the radiance.
As a result of biological data, which show that the permissible irradiance on the retina decreases in inverse proportion to the size of the image on the retina, this international standard has recently been changed.
Ocular hazards associated with extended sources are discussed from these aspects and typical examples are given of how these hazards should be assessed.
It is shown that, in some cases, the new rules for the classification of extended sources are too restrictive.
This could seriously limit the use of light-emitting diodes (LEDs), which are now included in the scope of the standard.
Mots-clés Pascal : 4255, 4272, Laser, Sécurité, Risque accidentel, Diode électroluminescente, Source rayonnement, Source étendue, Norme, Faisceau laser, Faisceau, Optique
Mots-clés Pascal anglais : Lasers, Safety, Hazards, Light emitting diodes, Radiation sources, Extended source, Standards, Laser beams, Beams, Optics
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 95-0259885
Code Inist : 002B30B03. Création : 01/03/1996.