System for reducing the effects of background radiation

Details System for reducing the effects of background radiation System for reducing the effects of background radiation

1981-03-02

1983-08-09

Corbin, John K.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

35016217, G02B 902

Patent

active

043975585

ABSTRACT:
A system for reducing the effects of background radiation on a desired signal includes a plurality of physically spaced phase shifters arranged in a two-dimensional array and disposed in the path of the desired signal for cancelling the background radiation while passing the desired signal without substantial attentuation. In a second embodiment, the desired signal is split into two beams which traverse different paths and passed through two complementary two-dimensional arrays of physically spaced attenuators, each array being disposed in one of the paths. A phase shifter is disposed in one or both of the paths and the signals from the two paths are recombined to cancel the background radiation. The two-dimensional arrays of physically spaced phase shifters may be integrated into the beam splitters.

REFERENCES:
patent: 4105289 (1978-08-01), Hershel
Matsumura, "Speckle Noise Reduction by Random Phase Shifters", Jap. J. Appl. Phys., vol. 13, No. 3, pp. 557-558, 3/74.
Zehnpfennig et al., "Background Suppression in Double-Beam Interferometry", Applied Optics, vol. 18, No. 12, pp. 1996-2002, 6/79.

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