Optics: measuring and testing – Refraction testing – Refractive rod engages specimen
Patent
1989-05-02
1990-08-21
Evans, F. L.
Optics: measuring and testing
Refraction testing
Refractive rod engages specimen
356361, G01N 2141, G01N 2145
Patent
active
049500740
ABSTRACT:
The invention is directed to a method for determining the refractive index (n) of a substance wherein monochromatic light is conducted to a single-mode wave guide integrated into a substrate. The wave guide is brought into contact with the substance to be measured along a segment of predetermined length. In this way, the effective refractive index in this segment of the wave guide is changed. This effect is utilized for measuring the refractive index of the measured substance. The change of the effective refractive index causes a phase displacement of the light travelling through this measuring segment. This phase displacement is measured as a phase difference to a light component not influenced by the measuring substance. This measurement is preferably made interferometrically.
REFERENCES:
patent: 4815843 (1989-03-01), Tiefenthaler et al.
Enokihara et al., Applied Optics, vol. 27, No. 1, Jan. 1, 1988, pp. 109-1 3.
"Integrated Optics: An Introduction", Stewart E. Miller, The Bell System Technical Journal, vol. 48, No. 7, pp. 2059-2069, (Sep. 1969).
Schott-Information, vol. 3, p. 29, FIG. 3, (1987).
Baumgart Jorg
Efstathiou Charitos
Fabricius Norbert
Gotz Helga
Guttmann Hans-Jurgen
Evans F. L.
IOT Entwicklungsgesellshaft fur Integrierte Optik-Technologie mb
Ottesen Walter
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