A two‐beam microinterferometric technique is used for the determination of refractive indices and birefringence of undyed and dyed polyester fibers. These fibers are dyed with five different concentrations of Resoline Violet RL dyestuff. The diameter and cross‐sectional shape of these fibers are determined from the diffraction pattern of a He‐Ne laser beam incident perpendicular to the fiber axis. The Pluta polarizing interference microscope is used for the determination of (a) the mean refractive indices na, na and the mean birefringence of the undyed and dyed polyester fibers and (b) the variation of refractive indices and birefringence across the diameter of these fibers. Variation of these optical properties with the dyestuff concentration is determined. Illustrations are given using microinterferograms.    

1.
P.
Kubelka
and
F.
Munk
,
Z. Tech. Phys.
12
,
593
(
1931
).
2.
P.
Kubelka
,
J. Opt. Soc. Am.
38
,
448
(
1948
).
3.
E. H.
Allen
and
G.
Goldfinger
,
J. Appl. Polym. Sci.
16
,
2973
(
1972
).
4.
G.
Goldfinger
,
K. C.
Lau
, and
R.
Mcgregor
,
J. Appl. Polym. Sci.
18
,
1741
(
1974
).
5.
R. C.
Faust
,
Proc. Phys. Soc. B
65
,
48
(
1952
).
6.
N.
Barakat
,
Text. Res. J.
41
,
167
(
1971
).
7.
M.
Pluta
,
J. Microscopy
96
,
309
(
1972
).
8.
A. A.
Hamza
,
Text. Res. J.
50
,
731
(
1972
).
9.
A. A.
Hamza
,
T. Z. N.
Sokkar
, and
M. A.
Kabeel
,
J. Phys. D
18
,
1773
(
1985
).
10.
A. A.
Hamza
,
J. Microscopy
142
,
35
(
1986
).
11.
N. Barakat and A. A. Hamza, Interferometry of Fibrous Materials (Adam Hilger, Bristol, 1990).
12.
M.
Pluta
,
Opt. Acta
18
,
1661
(
1971
).
13.
S. M.
Curry
and
A. L.
Schowlow
,
Am. J. Phys.
42
,
12
(
1974
).
14.
L.
Lynch
,
Text. Res. J.
144
,
203
(
1974
).
15.
A. A.
Hamza
,
T. Z. N.
Sokkar
, and
M. M.
Shahin
,
J. Appl. Phys.
69
,
929
(
1991
).
16.
A. A.
Hamza
,
M. A.
Kabeel
, and
M. M.
Shahin
,
Text. Res. J.
60
,
157
(
1990
).
17.
A. A.
Hamza
,
T. Z. N.
Sokkar
, and
M. M.
Shahin
,
J. Appl. Phys.
69
,
7231
(
1991
).
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