Zeiss Axiolab A Instrukcja Obsługi Pobierz pdf (Strona 54)

Carl Zeiss Axiolab A

3-12 B 40-015 e 06/99

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Reflected-Light Polarization - Detection of Bireflection and Reflection Pleochroism

Application

Polished sections of ores, coals, ceramic products, certain metals and metal alloys display a different

reflection behavior, depending on the orientation of the crystals or the object details. Therefore, this

technique also represents a further contrasting method.

Bireflection

• Set the microscope as usual for examinations in reflected-light brightfield (see section 3.2.1)

• Pull out plane-glass pushrod (3-3/1).

• Insert polarization slider (3-3/3) until stop.

• Insert analyzer slider (3-3/4); adjusting lever in center position.

• Close aperture diaphragm (3-4/7) by 2/3 of its diameter.

− The object displays bireflection if any object details feature differences in brightness and color

which vary when the stage is rotated.

Reflection Pleochroism

• Pleochroism can be recognized by color changes in the object after stage rotation (reflected-light

polarizer slider (3-3/3) pushed in, analyzer slider (3-3/4) pulled out). (Rotary λ-compensator pulled out)

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Zeiss Axiolab A Instrukcja Obsługi Strona 54