Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-11-23
1997-07-01
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022718, 356345, G01B 902
Patent
active
056441258
ABSTRACT:
A planar optic sensor for measuring the optical absorbance spectrum of a side variety of substances in situ comprises a planar waveguide Mach-Zehnder interferometer having a reference path and a sensing path. The sensing path of the waveguide is exposed to the sample under test, the sample interacting with the guided light via emanations from the light as it propagates through the sensing path. The reference path of the waveguide is provided with a heater that linearly varies over time the refractive index of the reference path material, in this manner varying the optical path length of the reference path. Fourier spectroscopic techniques are applied to compare the spectrum of a white light source without a sample present in the sensing path to the spectrum of the white light source in the presence of a sample in the sensing path, as the optical path length of the reference path is swept over time. From these data the absorption spectrum of the sample is determined.
REFERENCES:
patent: 4183669 (1980-01-01), Doyle
patent: 4538910 (1985-09-01), Doyle
patent: 4548464 (1985-10-01), Auracher et al.
patent: 4558951 (1985-12-01), Ludman et al.
patent: 4601579 (1986-07-01), Pritchard et al.
patent: 4761048 (1988-08-01), Gregoris et al.
patent: 5021661 (1991-06-01), Masutani
patent: 5196903 (1993-03-01), Masutani
patent: 5251008 (1993-10-01), Masutani
patent: 5262842 (1993-11-01), Gauglitz
patent: 5349437 (1994-09-01), Bobb
patent: 5422721 (1995-06-01), Ryan
1992 Proceedings: Sensors Expo, "Integrated Optic Sensors for Industry", pp. 1-11 John G. Edwards.
IEE Proceedings, vol. 131, Pt. H. No. 5, Oct. 1984 "Thermo-Optic Waveguide Interferometric Modulator/Switch in Glass." M. Haruna, Prof Koyama pp. 322-324.
M. Haruna, J. Koyama, Thermo-Optic Waveguide Interferometric Modulator/Switch in Glass, IEEE Proceedings, vol. 131, Pt. H No. 5 Oct. 1984.
Allen Stephone
Johnson, Esq. Christine
Research Foundation of State University NY
LandOfFree
Spectrometer employing a Mach Zehnder interferometer created by does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spectrometer employing a Mach Zehnder interferometer created by , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectrometer employing a Mach Zehnder interferometer created by will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-599386