Optics: measuring and testing – By polarized light examination – With birefringent element
Patent
1983-02-08
1986-01-21
Willis, Davis L.
Optics: measuring and testing
By polarized light examination
With birefringent element
356 731, 356349, G01B 902
Patent
active
045654492
ABSTRACT:
A body transparent to laser radiation, such as an optical fiber or a preform thereof, is transluminated by a monochromatic beam of a frequency in the THz range split off from a composite laser beam with two closely spaced frequencies produced by the Zeeman effect; the width of that beam in a plane transverse to the body axis is at least equal to the diameter of that body. Another monochromatic beam at the second laser frequency bypasses the transparent body and is recombined with the first beam downstream of the transluminated body to form a field of radiation which is photoelectrically sampled at closely spaced locations in the aforementioned transverse plane to provide a multiplicity of electrtical signals in the MHz range differing in phase from a reference wave of the same frequency photoelectrically obtained from the same monochromatic beams. The phase differences, determined by a comparator, are fed to a calculator computing the refractive-index profile therefrom.
REFERENCES:
patent: 3463924 (1969-08-01), Culshaw et al.
patent: 3881823 (1975-05-01), De Lang et al.
Koronkevich et al., "Interference Microscope with a Frequency Shift for the Investigation of the Refractive-Index Profiles of Glass Fibers", Sov. J. Quant. Elec., vol. 9, No. 10, p. 1332, Oct. 1929.
Sommargen, "Optical Meterodyne Profilometry", Applied Optics, vol. 20, No. 4, pp. 610-618, Feb. 1981.
Dietrich Marcuse, Herman M. Presby; Index Profile Measurements of Fibers and Their Evaluation; Proceedings of the IEEE, vol. 68, No. 6, Jun. 1980.
Article entitled "Principles of Optical Fiber Measurements", by Dietrich Marcuse, pp. 150-159.
Article entitled "P 101 Preform Analyser".
Cselt Centro Studi e Laboratori Telecomunicazioni S.p.A.
Dubno Herbert
Koren Matthew W.
Ross Karl F.
Willis Davis L.
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