Figure 5-36. Visible Laser Used To Align The Gas Cell; Figure 5-37. Beam Image On The First Objective Mirror In The Multi-Pass Gas Cell - Thermo Scientific Omni FTIR Multi Gas CEMS Instruction Manual

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Figure 5–36. Visible Laser Used to Align the Gas Cell
6. Check that the visible laser beam (or white light beam) is centered or
nearly centered in the spherical mirror #2 in the coupling optics
compartment (Figure
beam is roughly centered in the flat mirror #3 just before the input
window of gas cell. (Adjustments are made with the associated finger
screws.)
Figure 5–37. Beam Image on the First Objective Mirror in the Multi-pass Gas
Cell
7. Adjust the 45 degree mirror #3 to get the first beam image centered on
the first objective mirror
position of the image in the field mirror cutout. If the image is hitting
the edge of the field mirror or if it is not roughly in position, adjust the
sphere (#2), flat (#3), and 45 degree mirror (#1) so the image is
properly positioned in the field mirror cutout while also being centered
on the objective mirror. Mirror #1 is used to adjust the beam image on
mirror #2, mirror #2 is used to adjust the beam image on mirror #3,
and mirror #3 is used to position the beam image on the objective
Preventive Maintenance and Servicing
5–34). Then adjust the spherical mirror until the
Beam Image
(Figure 5–33 and Figure
Omni FTIR Multi Gas CEMS Instruction Manual
Gas Cell Alignment
2
5–37). Check the
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