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Carl Zeiss
Axiolab A
3-10
B 40-015 e 06/99
(4)
Transmitted-Light Polarization - Determination of the Optical Character of Crystals
Application
The optical character of transparent and weakly absorbing crystals must be determined for the diagnosis
of crystals. The determination is made in conoscopic observation. The main field of application is classical
petrography. However, it is also possible to identify and characterize synthetic crystals, industry minerals
and plastics (e.g. films).
Settings
•
Set the microscope as usual for brightfield and polarization examinations in transmitted light (see Fig.
3-5).
•
Swing in low-power objective.
−
In conoscopic observation, those crystals (e.g. of a mineral section) are optimally oriented which
alter the brightness least during the stage rotation. In that case, the optical axis of uniaxial crystals
or one of the optical axes of biaxial crystals is almost parallel to the observation direction.
•
Move one such crystal into the center of the switchable crosslines. Then swing in the objective with
the highest dry aperture and the condenser front lens.
•
Check whether the condenser stop is fully open and lift the condenser until the image of the
luminous-field diaphragm is in focus.
•
Now close the field of view diaphragm until the grain borders of the selected crystal are no longer
visible. This avoids the axis image of the examined crystal being overlaid by axis images of neighboring
crystals. Object details up to dia. 10
µ
m can thus be faded out.
When the stage is turned, the object must be oriented to the center of the crosslines, i.e. it must
remain within the examination area.
•
Replace one eyepiece with the diopter pinhole or the auxiliary lens.
•
Focus the axis image (pupil image).
−
The set conoscopic image shows whether the crystal is uniaxial or biaxial.
Summary of Contents for Axiolab A
Page 1: ...Axiolab A Reflected Light Microscope Operating Manual...
Page 16: ...Carl Zeiss Axiolab A 1 6 06 99 B 40 015 e Fig 1 3 Axiolab A microscope configurations...
Page 18: ...Carl Zeiss Axiolab A 1 8 06 99 B 40 015 e Fig 1 4 Axiolab A accessories 1 of 2...
Page 20: ...Carl Zeiss Axiolab A 1 10 06 99 B 40 015 e Fig 1 4 Axiolab A accessories 2 of 2...
Page 26: ...Carl Zeiss Axiolab A 1 16 06 99 B 40 015 e Fig 1 5 Axiolab A function elements 1 of 2...
Page 27: ...Axiolab A Carl Zeiss B 40 015 e 06 99 1 17 Fig 1 5 Axiolab A function elements 2 of 2 1 1 2...
Page 34: ...Carl Zeiss Axiolab A 1 24 06 99 B 40 015 e...
Page 36: ...Carl Zeiss Axiolab A 2 2 B 40 015 e 06 99...
Page 44: ...Carl Zeiss Axiolab A 3 2 B 40 015 e 06 99...
Page 68: ...Carl Zeiss Axiolab A 4 2 B 40 015 e 06 99...