13
DGM001519.01 UM Sirius CE/ROTW
The skin is generally able to withstand higher levels of laser radiation but can also be burned to a greater or
lesser degree depending on the duration and intensity of exposure. If necessary, wear suitable protective
clothing.
To avoid any mix-up, the laser goggles require adequate identification.
Laser goggles with a higher degree (or level) of protection (such as L3, L4, ...) or goggles featuring a broadband
filter of protection stage L2 or higher also covering wavelengths around 1940 nm could also be used.
If you suspect that you have received a damaged laser, please:
x Turn off the laser;
x Inform your supervisor and / or laser safety technician.
Nominal Ocular Hazard Distance
Following the Standard IEC 60825-1, the MPE (Maximum Permissible Exposure), NOHD (Nominal Ocular Hazard
Distance) and OD (Optical Density) are calculated.
o The MPE level represents the maximum level to which an eye, or skin, can be exposed without
consequential injury, immediately or after a long time. The MPE is related to radiation wavelength,
pulse duration or exposure time, the tissue at risk and, for visible and near infrared radiation in the 400-
1400 nm range, to the size of the retinal image.
o The NOHD is the distance at which the beam irradiance or radiant exposure equals the appropriate
corneal maximum permissible exposure.
o The OD of the protective goggles to be worn is defined as:
OD = log
10
(H
0
/MPE)
Where H
0
is the expected unprotected eye exposure level.
Results of MPE, NOHD and OD calculations are reported in the table in section 10.2.
Please, refer to previous section 2.6 for further details concerning the protection level in googles.
Laser system has to be used in a closed area that does not allow the escape of direct, reflected or transmitted
laser radiation.
Warning: Openings inside installation area that are transparent to laser radiation must be properly
darkened.
Doors equipped with a special interlocking system have to be made of a laser non-transparent material (glass,
plastic, curtains ...) and windows have to be darkened by using appropriate laser non-transmissive systems.
Environmental conditions
Caution: The working area must be marked with the laser warning labels, so as to prevent accidental
entry into the area. All windows, mirrors, metal and other reflective objects (clocks) should be covered, so as to
avoid distortions of the laser beam. All staff in the working area should know how to turn off the laser system in
case of emergency.
The use of mobile phones is prohibited in the working area while using the device, because it could interfere with
its proper operation.
Be careful that the laser system key is in a safe place when not in use.
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