Zeiss Axioplan Universal microscope Instrukcje Operacyjne Pobierz pdf (Strona 6)

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3 Application

The three-axis universal rotary stage (FigFig. 1/

) is

mounted on the rotary stage of the polarization

microscope of the

Axioplan Pol

Axioplan 2 Pol

Axiophot Pol

und

Axiophot 2 Pol

microscopes. For

the

Axiolab Pol,

the universal rotary stage is

equipped with a special stage carrier (Fig. 1/

)

and mounted directly on the stand in place of the

rotary stage. Observation and measurement is

generally possible in the orthoscopic and the

conoscopic mode. Linearly polarized and circu-

larly polarized light can be used. With the help of

one rotary and two tilting axes (stage 1), the three-

axis universal rotary stage is suitable for aligning a

crystal, which normally is birefringent, in any de-

fined direction relative to the optical axis of the

microscope.

The major fields of application of the universal

rotary stage can be classified into three catego-

ries:

Crystal diagnosis

Determining the optical character

Determining the absolute birefringence

Determining the grinding thickness

Measuring position and dimension of indicatrix

Measuring the optical shaft angle

Measurement of morphological reference planes,

such as cleavage faces, composition surfaces of

twins or the periphery of idiomorphous unit crys-

tals

Determining the pleochroism

Determining the chemical composition of mixed

crystals

Examination of plagioclases

Analysis of alkali feldspas

Analysis of pyroxenes and amphiboles

Structural analysis

Analysis of the structural arrangement of opti-

cally monaxial crystals, e.g. quartz in quartzite

or calcite in marble

Analysis of the structural arrangement of biaxial

crystals, e.g. muscovite in gneiss.

The most customary and also the clearest defini-

tion of the axes of a universal rotary stage is the

one introduced by Berek in 1924, in which the axis

numbers increase from the inside toward the out-

side. The inside rotary axis, for example, is num-

bered A

, the inside tilt axis A

. The rotary axes are

provided with odd, the tilt axes with even num-

bers.

Reinhard [10] and Sarantschina [12] have intro-

duced different definitions. The axial designations

of Sarantschina are based on the inventor of the

universal rotary stage, E. S. von Fedorow. With the

three-axis universal rotary stage the A

axis has not

been developed. This, however, is no drawback,

because three axes are absolutely adequate for

aligning any orientation in the sample relative to

the optical axis of the microscope. In addition, the

possibility of operational errors is reduced. Given

the option, old hands will therefore normally give

preference to a three-axis universal rotary stage

over the four-axis one.

Axial definition:

Berek Reinhard Sarantschina Universal

rotary stage

component

N =

Normal axis

N =

Normal axis

Inside rotary

axis

H =

Horizont axis

H =

Auxiliary axis

Inside tilt axis

A =

Auxiliary

axis

M =

Mobile axis

Outside ro-

tary axis

K =

Control axis

I =

Immobile

axis

Outside tilt

axis

M =

Microscope

axis

A =

Optical mi-

croscope

axis

Rotary axis of

microscope

stage

Rotary axis of

microscope

stage

Optical mi-

croscope

axis

Table 1

Fig. 2 Axial definition of universal rotary stage

1 2 3 4 5 6 7 8 9 10 11 ... 16 17

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