Method of and apparatus for interferometric background suppressi

Details Method of and apparatus for interferometric background suppressi Method of and apparatus for interferometric background suppressi

1977-06-13

1978-12-05

Clark, Conrad J.

Optics: measuring and testing

By particle light scattering

With photocell detection

356307, G01B 902

Patent

active

041283376

ABSTRACT:
A method of detecting a small elemental spectral source in a larger, spectral background, including producing a first interferogram of each element of an object area including the source and background; producing a second complementary interferogram of each element of that object area; projecting onto a detector images of the first and second interferograms and defocussing one of the first and second interferograms for providing a fluctuating elemental interferogram output from each element of the detector which receives an interferogram derived from the element of the object area that contains a source which spectrally distinguishes from the background, while reducing the output corresponding to each element containing no source to a constant and non-fluctuating level.

REFERENCES:
patent: 3588252 (1971-06-01), Habosian
patent: 3753619 (1973-08-01), Thorpe et al.
patent: 4009962 (1977-03-01), Lauer
patent: 4029416 (1977-06-01), Hawes

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