Datalogic Ulyxe PL, User Manual

Page: 63 / 68

63
ACCIDENTAL CONDITION OF VISION OF THE DIRECT REFLECTED RADIATION
Distance > 0,5 m and for a maximum exposition period of 10 seconds and supposing that there is a total
reflection without attenuation.
O.R.N.D. = 28,5 m
OPTICAL DENSITY OF THE PROTECTION GOGGLES
Case a) Assuming to remove the fix protections and penetrate in the working area to adjust the process
maintaining an observation distance Z of at least 0,5 m from the focal point and presupposing an accidental
exposition of maximum 10 seconds.
The protection goggles must have such an optical density to bear down the radiation under the maximum
permitted value, previously calculated, according to the here below reported calculation:
O.D.= 4,04 @ 1064 nm D.I.R.
Case b) Supposing to remove focusing head to do measurements on beam alignment, maintaining a Z
observing distance at least to 0,66 m from laser aperture, and supposing to use a reduction power of 50%
and a total accidental reflection for a 10 seconds maximum.
The protection goggles must have such an optical density to bear down the radiation under the maximum
permitted value, previously calculated, according to the here below reported calculation:
O.D.= 5,3 @ 1064 nm D.I.R.
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 EN 207 with
tests conducted for 10 seconds or 100 pulses.
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 exposition
period.
Case a) Htl = 62,6 J/m
2
Case b) Htl = 6760 J/m
2
To which it respectively corresponds a scale index (tab2 UNI EN 207) L5 and L7 .
To satisfy completely all prescriptions need to use a filter with optical density O.D.>6 and scale index L=7 .