Reduced complexity fourier transform spectrometer

Details Reduced complexity fourier transform spectrometer Reduced complexity fourier transform spectrometer

1996-09-09

1998-06-30

Font, Frank G.

Optics: measuring and testing

By particle light scattering

With photocell detection

356351, G01B 902

Patent

active

057742154

ABSTRACT:
A Fourier transform spectrometer for use, among others, for sensing gases or liquids includes two polarizers, a birefringent optical component interposed between the two polarizers and a detector. Light from an extended source is substantially polarized by a first of the two polarizers, split into divergent beams by the birefringent optical component, and again caused to converge by the birefringent optical component so that, after passing through a second of the two polarizers, the light forms an interferogram in a plane behind the birefringent optical component where the detector is situated. The Fourier transform spectrometer is thereby provided with a way of forming an interferogram of the light from the extended source without a lens or a second birefringent optical component. This improves the field of view of the spectrometer and is likely to reduce its cost.

REFERENCES:
patent: 3881105 (1975-04-01), De Long et al.
patent: 4320973 (1982-03-01), Fortunato et al.
patent: 4732481 (1988-03-01), Matsui et al.
patent: 4814604 (1989-03-01), Lequime
patent: 4867565 (1989-09-01), Lequime

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