Datalogic AREX 401, User Manual

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LASER SAFETY
108
AREX™ 401
ABSORPTION OF LASER RADIATION
Human tissues absorbs electromagnetic radiation in different ways depending on tissue
characteristics and the wavelength of the radiation. Certain wavelengths may be trans-
mitted or absorbed, in different levels, by the human tissue. In the specific case of the
eye, the Cornea and Crystalline lens allows most of the radiation within the wavelength
range of 400nm to 1400nm to pass a reach the retina (where are the vision sensors).
This range includes the visible light as wells a s near-infrared. The Arex™ 400 laser mark-
ers emit in the 1060nm range and thus can be focused by the eye lens at retina with
serious risk of causing irreversible damage to vision sensors.
Regarding human skin, the tissue abortion level is higher for the same wavelength range
but the maximum exposure tolerance level, before there is a damage, is different com-
pared to eye.
Retina Vitreous Body Cornea
Optical Nerve Crystalline Lens Crystalline Humor
Figure 78: Eyeball section.
The degree of injury depends on the amount of absorbed radiation; the power, energy
and peak power of the radiation source, as well as the time exposed to such radiation.