Method of determining the refractive index of a substance and ap

Details Method of determining the refractive index of a substance and ap Method of determining the refractive index of a substance and ap

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).

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