Nikon Eclipse E400 POL 사용 설명서 - 페이지 28

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Ш 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 1/42 &

tint plate. The quartz wedge is engraved with a scale

and can be used for rough measurement of retardation in

the range of 12-62.

It is normal to bring the top lens of the condenser into the optical path when observing at a

magnification of 10x or greater. Measuring the retardation or evaluating by interference

color, however. swing out the top lens even for a magnification of 10x stop down the

condenser aperture diaphragm or higher (with the aperture diaphragm fully opened), and

illuminate with light that is as parallel to the optical axis as possible.

1 Determination of Extinction Position

Rotate the stage with the specimen under the crossed Nicols to find the direction where

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 whe

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

measured changes toward the lower order side.

If the interference color changes toward

higher order side, rotate the stage another 90%

3 Measurement

Move the section of the specimen to be measured

to the center of the crosshairs of the eyepiece.

Next, slide the P-CQ quartz wedge along the slot

and observe that the interference color

sequentially changes. Stop sliding the quartz

wedge where the dark stripe covers the section of

the specimen to be mi

from the q

asured. Reading the value

artz wedge scale at that time can make

rough measurement of retardation

Retardation can be measured even more

curately by using the P-CS Sénarmont

compensator in combination with the P-CQ quartz

wedge.

Read the scale