81
ACCIDENTAL CONDITION OF VISION OF THE DIRECT REFLECTED RADIATION
Assuming a direct exposure of 10 seconds at a nominal distance of 0,5 m (worst case considered), with F-
Theta Scan Lens 160 mm model installed, it is possible to calculate the suitable optical density (O.D.) for
safety goggles.
The O.D. (Optical Density) in last column assures the reduction of laser radiation below max acceptable
exposure.
O.D.
= log (H/EMP) where EMP is the Maximum Permissible Exposure and H is the radiant exposure.
Source
N.O.H.D.
(Nominal Ocular Hazard Distance)
O.D. (Optical Density)
Arex
TM
Marker 30W
31,6 m
> 4.19
Arex
TM
Marker 50W
40,8 m
> 4.41
SCALE INDEX OF THE PROTECTION GOGGLES FILTER
The scale index L of the filters indicates the stability to the radiation, that means the ability of the filter to
maintain its characteristics unchanged.
This stability is certified by the producer according to the UNI EN 207.
It is then necessary to verify that the scale index of the adopted filter is stable for this period and foreseen an
adequate over dimensioned in order to make sure that it could last longer than the accidental exposure
period.
In case of exposure at 0,5 m for 10 seconds, the suggested optical density for safety goggles is CLASS L4.
Summary of Contents for Arex 30W
Page 1: ...USER S MANUAL ArexTM 30W 50W ...
Page 92: ...92 APPENDIX G MECHANICAL DRAWINGS ...
Page 93: ...93 NOTE Please refer to Datalogic website for detailed drawings ...
Page 96: ......
