Nikon OPTIPHOT-POL Manual de instrucciones - Página 19
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VI.
ACCESSORIES
1.
Senarmont Compensator
To be inserted into the compensator slot of the
intermediate
tube "P" in place of the 1/4 A &
tint
plate to measure the retardation with the
accuracy of the A unit. (Fig. 33)
Fig. 33
1)
Detecting of extinction
position
Rotate the stage with the specimen under
the crossed Nicols to find out the direction
where the specimen part for measurement
appears darkest.
2)
Detecting of subtraction
position
Rotate the stage
45°
to bring it to the dia-
gonal position from the extinction
position
and confirm
that the interference color of
the specimen part for measurement changes
toward
the lower order side by inserting
the 1/4 A
&
tint plate into the optical path.
If the color changes toward
higher order
side,
rotate
the
stage further
by 90°.
2.
Quartz Wedge
The quartz wedge is used instead of the 1/4 A
& tint
plate that is in the compensator
slot of
the intermediate tube "P". (Fig. 34)
With this wedge the retardation
in the range of
1 A ~ 6 A can roughly be measured.
-"~
Fig. 34
1) Detecting of extinction
position
Detect
the position
where the specimen
part for measurement becomes darkest by
rotating the stage under the crossed Nicols.
2)
Detecting of subtraction
position
Rotate the stage
45°
to bring it to the dia-
gonal position from the extinction
position
and confirm that the interference color of
the specimen part for measu rement changes
toward
the lower order side by inserting
the quartz wedge into the optical path.
If the color
changes toward
the higher
order side, rotate the stage further by
900
When the fi Iter G I F is used: A = 546nm
3)
Measurement
Inserting
the
filter
GIF
into
the
filter
receptacle, replace the 1/4 A
&
tint
plate
by the compensator.
Rotate the analyzer so as the specimen part
for measurement becomes as dark as possi-
ble.
Let the angle of the above analyzer rota-
tion be
eO
then the retardation
R (nm) will
be obtained as follows:
where A
wave
length
of
the
Iight
used
for
the
measu rement
3)
Measurement
By sliding the quartz wedge along the slot,
the interference color changes consequent-
ly.
The wedge sliding is to be stopped when
the specimen part for measurement comes
under the dark stripe, then compare the
interference color of the view field beyond
the
specimen but
under the same dark
stripe with the Interference Color Chart to
assume the amount of retardation.
If the view field is entirely filled with the
speci men arou nd the part to be measu red,
restrict
the illumination
of the view field
except around the part for measurement
by means of the field diaphragm,
remove
the specimen away the optical
path and
then compare the interference
color with
the chart.