Datalogic Ulyxe PL, Руководство пользователя

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62
REAL N.O.H.D. DETERMINATION AND O.D. OF PROTECTION GOGGLES
In order to determinate the characteristics of the protection goggles, it is essential to determine the
characteristics of the radiation, knowing it optical path, the dimensions of the beam and its divergence.
In particular, it is very important to know the diameter of the focal spot (which can be identified with beam
waist 2Wo) and the real divergence of the beam in output from the focalization lens.
With all these optical data it is possible to do the calculations of the nominal distance of optical risk and of
the optical density requested to the protection filters of the laser radiation.
Calculations have been done following the CEI EN 60825-1 (2014) Normative regarding Nominal
Ocular Hazard Distance (N.O.H.D.) in the worst condition and in case of accident exposition of 10
seconds per direct radiation and 100 seconds for diffused radiation.
Laser type Nd:YVO
4
: 1064 nm
Application type Marking
Emission type Pulsed (Q-Switched)
Observation type Direct Radiation
Subtended angle of the source Alpha < alphamin
Pulse energy
350
µ
J
Pulse duration 20 ns
Repetition frequency 10 KHz
Beam diameter on the lens 2,5 mm
Beam divergence on the lens 1,5 mrad
Focal of the lens 160 mm
Real divergence after the lens 14 mrad
Exposition time 10 s
Diameter of the focal spot 165
µ
m