Barco F90-W13, User Manual, Page: 13 / 57

1. Safety
RA TH
sw
PD
HD
DIFFUSE
sw
RZ
sw
sw
PR
HD
REFLECTION
RESTRICTED
AREA
RESTRICTED
AREA
Image 1-4
RA Restricted Access location (Enclosed projection area)
PR Projector.
TH Theater (observation area).
RZ Restriction Zone
PD Projection Distan
SW Separation Width. Must be minimum 1 meter.
Restriction zone (RZ) based on the HD continued.
For this type of setup 3 different HD shall be considered:
• HD as discussed in "High Brightness precautions: Hazard Distance (HD)", page 6 , relevant for intrabeam exposure.
• HDre fl ection : the distance that has to be kept restrictive related to the re fl ected light from the rear projection screen.
• HDdiffuse : the relevant distance to be considered while observing the defuse surface of the rear projection screen.
As described in "High Brightness precautions: Hazard Distance (HD)", page 6 , it is mandatory to create a restricted zone within
the beam areas closer than any NOHD. In the enclosed projection area the combination of two restricted zones are relevant: The
restricted zone of the projected beam toward the screen; taking into account 1 meter Separation Width (SW) from the beam onward.
Combined with the restricted zone related to the rear re
fl ection from the screen (HDre fl ection); also taking into account a 1 meter
lateral separation.
The HDre fl ection distance equals 25% of the difference between the determined HD distance and the projection distance to the rear
projection screen. To determine the HD distance for the used lens and projector model see graphs in chapter "HD in function of the
lens Throw Ratio (TR)", page 8 .
HDre fl ection = 25% (HD – PD)
The light emitted from the screen within the observation shall never exceed the RG2 exposure limit, determined at 10 cm. The
HDdiffuse can be neglected if the measured light at the screen surface is below 5000 cd/m² or 15000 LUX.
1.7 HD in function of the lens Throw Ratio (TR)
TR (Throw Ratio)
The ratio of the distance to the screen (throw) to the screen width.
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