PFIS Assembly: Calibration
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PFIS Assembly: Calibration |
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The calibration setup is shown here with the fresnel lens in place. The
fresnel lens is made of UV-transmitting acrylic and the distance between the
lens and the lamp is set to be the focal length of the lens. The top surface
of the lens is a diffusing surface, which gives an very even illumination
across the entrance pupil of PFIS.
These parts will be black anodized before usage with PFIS.
To the left is a picture looking down at the fresnel lens being illuminated
by the Neon pencil lamp. There is some vignetting near the edges of the field,
but overall the illumination is very good.
I have completed a trial assembly of the calibration setup. The three long
poles hang down from the guider interface on PFIS and the triangular plates
hold the various lamps, etc. The picture on the left shows the fiber-optic
backlight mounted with the quartz tungsten halogen lamp feeding it. To the
right is a closeup of the QTH lamp feeding the fiber bundle through a neutral
density filter.
The first of the fabricated calibration setup parts have come back from
the shop. To the right is a picture of the pencil lamp mount. The hole on the
top with the recess and circular bolt pattern can hold neutral density filters.
The block can be positioned so that the light exits horizontally, feeding the
fiber bundle of the fiber-optic backlight, or vertically, into a fresnel lens
and diffuser.
