60
Polarisation contrast*
Adjust the microscope as for brightfield examina-
tions.
Incident light polariser R/P in slide (79)
Adjust the polariser to the vibration direction 0° =
east-west (polariser can be plugged in different
positions)
Push the polariser into the polariser slot as far as
the stop (78.2)
Slide the IRM ICR/P analyser (76.3) into the ana-
lyser slot as far as the stop.
Swing the analyser (76.3) round the zero position
until you achieve the greatest possible extinction.
Incident light polariser 90°, rotatable, with rota-
table whole-wave compensator (80)
Set the vibration direction 0° = east-west with the
dial (80.1).
Together with the analyser IRM ICR/P 90° =
north-south, the polariser and analyser are in a
crossed position.
Polarisation-optic colour contrast is produced
with crossed polarisers and rotation of the com-
pensator (80.2).
The rotation range of the compensator is about
14°.
This polariser is particularly useful for fine variati-
ons of the pol-optic colour contrast of anisotropic
metal surfaces (e.g. aluminium, zircon, titanium).
Incident light polariser L ICR/P with whole-
wave compensator, reversible (81)
For use with DMIRM with permanently oriented
vibration direction 0° = east-west.
The compensator is permanently oriented in the
diagonal position 45° and can be activated and
deactivated by turning the polariser slide over by
180° (
l
engraving).
When the compensator is activated, pol-optic
colour contrast with a fixed retardation of one
wavelength is produced (1st order red).
n.b.:
When using gas discharge lamps (Hg, Xe), make
sure to insert a pol protection filter, order no.
504079, into the lamphousing 106Z to prevent irre-
parable damage to the polarisation foil (39.1).
Fig. 79
Incident light polariser R/G
1
Polariser mount with 0°, 45°, 90° clickstops
Fig. 80
Incident light polariser 90°, rotatable, with whole-wave
compensator
1
Polariser adjustment,
2
Compensator knob
Fig. 81
Incident light polariser L ICR/P
1
1
2