Page 25 - Shimadzu EPMA-1720 Series

Options

Transmitted Polarization Observation System

With this option, some of the functions of a transmission polarization microscope,
widely used in mineralogy and crystallography research, are achieved with an
EPMA optical observation system. Rock akes and other aked samples are
exposed to polarized light from below, and the transmitted light is observed with
an EPMA optical observation system, enabling polarization observation.
When samples are observed with a transmission polarization microscope already
in the customer's possession, and are then observed or analyzed via EPMA based
on the knowledge obtained, the observational functions of this product will be
useful in searching for target positions. Observation and analysis can be
performed using an electron beam while performing polarization observations.

• Features
Observations can be performed in both open nicol and crossed nicols modes.

Sample Observation in Open Nicol Mode Sample Observation in Crossed Nicols Mode
In open nicol mode, light passed through a polarizing In crossed nicols mode, observation is performed
element (polarizer) is used to illuminate the sample through a polarizing element (analyzer) configured to
from below. The transmitted light is then observed an angle orthogonal to the polarizer. Mineral types
with the EPMA optical microscope. Mineral types are are inferred from interference colors that appear
inferred by observing the boundary between depending on the type and thickness of the mineral
neighboring minerals, and comparing refractive indices sample.
and studying the presence or absence of coloration.
Polarization observations can be performed Sample Observations When the Polarization Angle Is Changed
without rotating the sample.
With this system, the angle of the polarized light is changed by controlling the
rotation angle of the polarizer and analyzer. As a result, observations can be
performed without rotating the sample.

Polarization Angle: 85° Polarization Angle: 113°

Collisions between the light guide and sample base due to improper operation are prevented.
When polarization observations are performed, the polarization observation sample base is used, and the tip of the polarization illumination optical path (light guide) is moved
directly below the sample. When a standard sample base is used, the light guide tip is retracted to prevent collisions with the sample base.
This system identifies the polarization observation sample base, and controls the stage and light guide accordingly, enabling it to prevent collisions due to improper operations.

The control window for polarization observations is linked The stage map for the polarization
to insertion of the polarization observation sample base. observation sample base can be used.

Window display is linked to
the polarization observation
sample base

Operational Windows in the Observation Window Stage Map Selection Window
The control window for polarization observations displayed on the PC is linked to insertion of the The stage can be moved to the intended observation position
polarization observation sample base into the instrument. Operations following insertion of the utilizing the stage map corresponding to the polarization
polarization observation sample base can be smoothly performed. observation sample base.

EPMA-1720 Series
Electron Probe Microanalyzer 25