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Bruker Optik GmbH HYPERION User Manual
Operation 4
4.15.3 Setting the viewing mode (VIS) or measuring mode (GIR)
The following modes of operation can be set by means of the GIR objective mirror
optics: viewing mode (VIS) and measuring mode (GIR). To set the desired mode,
grasp the two VIS-GIR knobs (one knob is at the GIR objective front side, the other knob
is at the GIR objective back side) and shift them either to left (VIS) or to the right (GIR)
up to the stop. See fig. 4.4. In doing so, the position of the plane mirror pair is slightly
shifted as well.
Viewing mode (VIS): The plane mirror pair is positioned in such a way that the focal
point of the 15x GIR objective is displaced allowing a sample viewing vertically from
above with a 15x magnification.
Measuring mode (GIR): The plane mirror pair is positioned in such a way that IR-beam
is reflected on the sample surface at a grazing incidence angle. After being reflected
from the sample surface, the beam impinges on the ellipsoidal mirror. The ellipsoidal mir-
ror reflects the IR beam back to the sample surface where the beam is focussed on the
same point. Afterwards, the IR beam is redirected through the objective into the micro-
scope and impinges on the detector.
VIS-GIR knobs
for setting the
desired mode of
operation
Figure 4.4: Setting mode of operation (VIS or GIR)
Figure 4.5: Beam path in VIS mode and in GIR mode
Viewing mode (VIS)
Measuring mode (GIR)
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