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Safety
LIPs for installations in unrestrained environment (concerts, ...) shall be installed at a height vertically above the floor such that the bottom
plane of the Hazard distance Zone shall be no lower than 3 meters above the floor. Horizontal clearance to the hazard distance zone shall
be not less than 2.5 meters. Any human access horizontally to the Hazard Zone, if applicable, shall be restricted by barriers. If human
access is possible in an unsupervised environment, the horizontal or vertical clearances shall be increased to prevent exposure to the
hazard distance zone.
The LIP shall be installed by Barco or by a trained and Barco-authorized installer or shall only be transferred to laser light show variance
holders. This is applicable for dealers and distributors since they may need to install the LIP (demo install) and/or they transfer (sell, rent,
lease) the LIP. Dealers and distributors shall preserve sales and installation records for a period of 5 years. Variance holders may
currently hold a variance for production of Class IIIB and IV laser light shows and/or for incorporating RG3 LIPs. Laser light show variance
for RG3 LIPs can be requested by mailing the application to RadHealthCustomerService@fda.hhs.gov.
The installation checklist for laser illuminated RG3 projectors must be fully completed after the installation. The installation checklist can
be downloaded from the Barco website. The installer shall preserve the checklist for a period of 5 years.
Install one or more readily accessible controls to immediately terminate LIP projection light. The power input at the projector side is
considered as a reliable disconnect device. When required to switch off the projector, disconnect the power cord at the projector side. In
case the power input at the projector side is not accessible (e.g. truss mount), the socket outlet supplying the projector shall be installed
nearby the projector and be easily accessible, or a readily accessible general disconnect device shall be incorporated in the fixed wiring.
1.5 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 1–3
two areas should be considered: the restricted enclosed projection area (RA) and the observation area (TH).
RESTRICTED
AREA
Image 1–3
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
•
HD
: the distance that has to be kept restrictive related to the reflected light from the rear projection screen.
reflection
•
HD
: the relevant distance to be considered while observing the diffuse surface of the rear projection screen.
diffuse
As described in
"High Brightness precautions: Hazard Distance", page
closer than any HD. 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 (HD
The HD
distance equals 25% of the difference between the determined HD distance and the projection distance to the rear
reflection
projection screen. To determine the HD distance for the used lens and projector model see chapter
page
11.
HD
= 25% (HD – PD)
reflection
The light emitted from the screen within the observation shall never exceed the RG2 exposure limit, determined at 10 cm. The HD
can be neglected if the measured light at the screen surface is below 5000 cd/m² or 15000 LUX.
10
R5912127 /03
SP4K-B
RA
RZ
PR
reflection
TH
HD
DIFFUSE
PD
HD
REFLECTION
RZ
Restriction Zone.
PD
Projection Distance.
SW
Separation Width. Must be minimum 1 meter.
8, relevant for intrabeam exposure.
8, it is mandatory to create a restricted zone within the beam areas
); also taking into account a 1 meter lateral separation.
"HD in function of modifying optics",
diffuse
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