Hd In Function Of The Lens Throw Ratio (Tr) - Barco F90–W13 User Manual

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Table of Contents

RESTRICTED

AREA

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RA Restricted Access location (Enclosed projection area)

PR Projector.

Theater (observation area).

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.

•

HDreﬂection : the distance that has to be kept restrictive related to the reﬂected 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 reﬂection from the screen (HDreﬂection); also taking into account a 1 meter

lateral separation.

The HDreﬂection 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 .

HDreﬂection = 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.

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