Optional Accessories; Senarmont Compensator - Nikon LABOPHOT2-POL Instructions Manual

Polarizing microscope

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v .

OPTIONAL ACCESSORIES

1 . Senarmont Compensator

To be inserted into the compensator slot of the intermediate tube in

place of the

1/4,,1.

& tint plate to measure the retardation with the

accuracy of the lambda

(A)

unit. (Fig. 24)

Fig.24

1) Detecting extinction position

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

out the direction where the part of the specimen to be measured

appears darkest.

2) Detecting subtraction position

Rotate the stage 45° to bring it from the extinction position to the

diagonal position. Insert the

1/4,1

& tint plate into the optical path,

and confirm that the interference color of the part of the specimen to

be measured changes toward the lower order side. If the color

changes toward the higher order side, rotate the stage another 90°.

3) Measurement

Place the GI F filter on the filter receptacle, and replace the

1/4,1

tint plate with the compensator.

Rotate the analyzer so that the part of the specimen to be measured

becomes darkest.

Let the angle of the above analyzer rotation be theta (8) then the

retardation R (nm) will be obtained as follows:

180,,1.

Where A: wave length of the light used for the measurement

When the GIF filter is used: ,,1.=546nm

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