Zeiss Axiolab A Especificaciones descargar pdf (Pagina 99)

OPERATION

Axio Lab.A1 Lighting and contrasting method in transmitted light Carl Zeiss

04/2013 430037-7144-001 99

x Set the microscope as in the transmitted light

brightfield according to KÖHLER (see Section

4.1.1).

x Swivel polarizer (Fig. 4-12/3) into the light path

and, if it is rotatable, position it at 0°.

x Swivel the analyzer into the beam path and

bring into a crossed position with the setting

wheel. (The field of view will now appear dark)

x Place the specimen on the stage and focus on

it.

x Swivel the analyzer into the beam path (on

position) with rotary knob A (Fig. 4-17/2). The

direction of oscillation can be changed using

the setting wheel (Fig. 4-17/4) of the analyzer.

CAUTION

The movements of rotary knobs A and BL

and the respective setting wheels are coupled with

one another. Only one control element should therefore be operated at a time and the

movement of the other should not be inhibited or blocked. Mechanical damage may otherwise

occur.

If rotary knob BL is set at the on position, rotary knob A is automatically carried if it is not

already in the on position.

If, on the other hand, rotary knob A is set to the off position, if it is not already at the off

position rotary knob BL is automatically carried.

x Place a selected crystal in the center of the crossline reticle.

x Swivel in objective N-Achroplan 50x/0.8 Pol or EC Plan-Neofluar 40x/0.9 Pol and focus with the

focusing drive.

x If necessary, close the luminous-field aperture to avoid superimposition of the axial figure by axial

figures of neighboring crystals. The smallest crystal range that can be faded out is approx. 170 μm.

x Switch on Bertrand lens BL (Fig. 4-17/1) (Position on). The axial figure will appear in the field of view.

x Bring the axial figure into focus with setting wheel (Fig. 4-17/5).

4.1.7.2

Evaluation

Crystalline anisotropic specimens can be separated into optical uni- and biaxial, in each case with

"optically positive" or "negative" character.

Uniaxial crystals display a black cross when the optical axis is parallel to the direction of view.

Depending on the size of the birefringence and specimen thickness, concentrically arranged

colored interference rings (so-called isochromes) may appear (see also Fig. 4-11 second row).

This cross remains closed when the stage is rotated. Depending on the section it may lie within or outside

the displayed objective pupil.

Fig. 4-17 Axio Lab.A1 for transmitted light

conoscopy

1 2 ... 94 95 96 97 98 99 100 101 102 103 104 ... 117 118

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Zeiss Axiolab A Especificaciones Pagina 99

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