Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1983-02-08
1985-11-19
Willis, Davis L.
Optics: measuring and testing
By particle light scattering
With photocell detection
356 731, 356357, 356361, G01B 902
Patent
active
045538417
ABSTRACT:
A body transparent to laser radiation, such as an optical fiber or a preform thereof in the process of manufacture, 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. Another monochromatic beam of the second laser frequency bypasses the transparent body and is photoelectrically recombined with the first beam to provide an electrical measuring wave at a beat frequency in the MHz range differing in phase from an electrical reference wave of the same beat frequency, similarly derived from the original laser beam, to an extent determined by the refractive index and the thickness of the transluminated body. Two or more phase comparisons are made with different angles of incidence of the transluminating beam and their results are compared for an arithmetic determination of refractive index and thickness.
REFERENCES:
patent: 3471238 (1969-10-01), Hawke
patent: 4441811 (1984-04-01), Melezoglu et al.
patent: 4492463 (1985-02-01), Marcuse et al.
Goodman, "Optical Interference Method . . . ", Applied Optics, vol. 17, No. 17, p. 2779, Sep. 1978.
Koronkevich et al., "Interference Microscope with a Frequency Shift . . . ", Sou. J. Quant. Electr., vol. 9, No. 10, p. 1332, Oct. 1979.
Article entitled "Fundamentals of Optics", by Francis A. Jenkins, and Harvey E. White, pp. 16-22.
Coppa Gianni
Grego Giorgio
Cselt Centro Studi E Laboratori Telecomunicazioni, S.p.A.
Dubno Herbert
Koren Matthew W.
Ross Karl F.
Willis Davis L.
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