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| This image shows the FGS Optical Assembly. The left image shows the FGS Guider. Light enters the guider from the left, bounces off four mirrors, and hits the focus mechanism before entering the detector. The right image shows the FGS Tunable Filter. Light enters at the right and bounces off four mirrors before it reaches the filter wheels, which use infrared filters to single out broad wavelengths. The light then passes through the parallel plates of the tunable filter, or etalon, which only transmit wavelengths over a very narrow range. The light bounces off four additional mirrors before entering the detector. |
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