Hd For Fully Enclosed Projection Systems - Barco G100 User Manual

RESTRICTED
AREA
Image 1–3

1.4.3 HD for fully enclosed projection systems

HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the
energy per surface unit becomes lower than the applicable exposure limit on the cornea or on the
skin. The light beam is considered (to be) unsafe for exposure if the distance from a person to the
light source is less than the HD.
Restriction Zone (RZ) based on the HD
The projector is also suitable for rear projection applications; projecting a beam onto a defuse coated
projection screen. As displayed in Image 1– 4 two areas should be considered: the restricted enclosed
projection area (RA) and the observation area (TH).
RESTRICTED
AREA
Image 1–4
RA Restricted Access location (enclosed projection area).
PR Projector.
TH Theater (observation area).
For this type of setup 3 different HD shall be considered:
• HD as discussed in "High Brightness precautions: Hazard Distance", page 13, relevant for intrabeam
exposure.
• HD : the distance that has to be kept restrictive related to the reflected light from the rear projection
reflection
screen.
• HD : the relevant distance to be considered while observing the diffuse surface of the rear projection
diffuse
screen.
As described in "High Brightness precautions: Hazard Distance", page 13, it is mandatory to create a
restricted zone within the beam areas closer than any HD. In the enclosed projection area the combination of
RZ
RA
RZ
PR
TH
HD
DIFFUSE
PD
HD
REFLECTION
RZ Restriction Zone.
PD Projection Distance.
SW Separation Width. Must be minimum 1 meter.
Safety
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