Nikon ECLIPSE E600 POL Руководство по эксплуатации - Страница 30
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1 Determination of Extinction Position
Rotate the stage with the specimen under the crossed Nicols to find the direction where the
part of the specimen to be measured appears darkest.
r
Determination of Subtraction Position
Rotate the stage 45° from the extinction position to the diagonal position. Insert the P-CL
l/4A.
&
tint plate into the optical path and confirm that the interference color of the section
of the specimen to be measured changes toward the lower order side. If the interference
color changes toward the higher order side. rotate the stage another 90°.
3 Measurement
Place the GIF filter on the field lens and replace the P-CL l/4A. & tint plate with the P-CS
Senarmont compensator. Rotate the analyzer so that the section of the specimen
to
be
measured becomes darkest. When the rotation angle of the analyzer at that time is taken to
be theta (8) degrees. then retardation (R) (nm) is determined with the following formula:
e
R
=
180
/... (/...: wavelength used)
The value of A. when using the GIF filter is 546 nm.
•
2. P-CQ Quartz wedge
The P-CQ quartz wedge is used by inserting it into the
slot of the intermediate tube in place of the P-CL l/4A. &
tint plate. The quartz wedge is engraved with a scale
and can be used for rough measurement of retardation in
the range of I /...-6A..
It is normal to bring the top lens of the condenser into the optical path when observing at a
magnification of IOX or greater. Measuring the retardation or evaluating by interference
color. however. stop down the condenser aperture diaphragm or swing out the top lens even
for a magnification of IOx or higher (with the aperture diaphragm fully opened). and
illuminate with light that is as parallel to the optical axis as possible.
Determination of Extinction Position
Rotate the stage with the specimen under the crossed Nicols to find the direction where the
part of the specimen to be measured appears darkest.
2 Determination of Subtraction Position
Rotate the stage 45° from the extinction position to the diagonal position (direction where
the specimen appears brightest). Insert the P-CQ quartz wedge into the slot of the
intermediate tube and confirm that the interference color of the section of the specimen to be
measured changes toward the lower order side. If the interference color changes toward the
higher order side. rotate the stage another 90°.