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Axio Imager 2
OPERATION
ZEISS
Illumination and contrast methods
01/2016
430000-7544-001
181
(3)
Setting the microscope for conoscopy
with the phototube Pol
In the case of uniaxial crystals, the most favorable
orientation for conoscopic viewing is obtained with
the specimen features (e.g. thin sections) that
change the brightness as little as possible in
orthoscopic viewing during stage rotation. In this
case, the direction of viewing and the optical axis
are parallel. The same applies to biaxial crystals if
they are viewed along or in the approximate
direction of one of the two optical axes.
•
Set up the microscope as for transmitted-light
polarization (refer to Section 4.12.5.1 (3)).
•
Place the specimen on the stage and bring it
into focus.
•
Switch phototube Pol to visual observation, if
necessary. To do so, pull out the push-pull rod
on the left side (Fig. 203/
3
).
•
On phototube Pol, push in the front push-pull
rod (Fig. 203/
2
) on the right side to move the
reticle into the light path.
•
Move a selected crystal to the center of the
reticle.
•
Swivel in the 40x, 50x or 100x objective and, if
necessary, refocus the specimen using the
focusing drive.
•
Check the centering of the objective by rotating the microscope stage. Recenter it, if necessary.
•
Turn the front push-pull rod (Fig. 203/
2
) to close the luminous-field stop until only the selected
specimen feature remains visible. This is to prevent the axial figure of the crystal being examined from
being overlapped by the axial figures of adjacent crystals. This allows crystals from 10 µm diameter to
be viewed in conoscopic illumination.
•
Move the Bertrand lens on the phototube Pol into the light path. To do so, push in the rear push-pull
rod (Fig. 203/
1
) on the right side. The axial figure then appears in the field of view. To focus the axial
figure, turn the rear push-pull rod.
(4)
Setting the microscope with Bertrand lens slider or tube lens turret with Bertrand lens
optics for conoscopy of large-size specimens
•
Set up the microscope as for transmitted-light polarization (refer to Section 4.12.5.1 (3)).
•
Place the specimen on the stage and bring it into focus.
•
Swivel in the 40x, 50x or 100x objective and, if necessary, refocus the specimen using the focusing
drive.
•
Check the centering of the objective by rotating the microscope stage. Recenter it, if necessary.
•
Close the luminous-field diaphragm until only the selected specimen feature remains visible.
Fig. 203
Axio Imager 2 with mounted
phototube Pol