Figure 3-18.--Typical cell calibration setup (overhead view).
Figure 3-19.--Cell focusing measurements.
maintaining a weather seal to keep moisture, dirt, and so
regulation in the lens compartment. These are discussed
on from entering. Cool air is drawn in through the rear
in the following paragraphs.
louver by the blower fan, and exhausts through the side
louver after absorbing heat radiated by the projection
Projection Lamp Compartment Cooling
The three projection lamps used in the GSI generate
Lens Assembly Temperature Control
large amounts of heat when they are operated at full
intensity. Cooling of this compartment is accomplished
Temperature control of the Fresnel/lenticular lens
by a blower/louver arrangement. A special design louver
assembly is located on each side of the projection lamp
assemblies is important to prevent lens distortion fog-
ging, or other environmental reactions. In the GSI, lens
shroud This design allows entry of cooling air while