Datalogic AREX 401, User Manual

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LASER SAFETY
112
AREX™ 401
EN207 AND EN208
The O.D. value specifies the attenuation factor that the filter material theoretically has
on the beam. However it does not specify the damage threshold of the filter material!
The filter material may not be able to withstand the power of a particular laser and may
fail instantaneously and result in serious eye injury.
In Europe, two standards have been developed for materials used as filters and frames
for laser protective eye wear and laser protection windows. The EN207 and EN208
norms both specify the damage threshold of the filter material used.
The EN207 standard is used for full attenuation, these filters are used to completely
block the wavelength for which they are specified.
The EN208 standard is used for partial attenuation, these filters are used only in the vis-
ible range 380-700nm where they reduce the beam intensity down to the Maximum
Permissible Exposure (safe level). They are particularly useful for alignment where see-
ing the beam is necessary.
Safety goggles are labeled according to EN207 or EN208 as appropriate. For example, a
filter labeled 900-1100 R LB6 xxx CE means that:
900-1100 R LB6 XXX CE
Manufacturer
O.D.
≤
6
Pulse width 1ns to 1 μ s
Spectral range 900-1100nm