Tunable multispectral optical filter and imaging apparatus

Optical: systems and elements – Diffraction – Using fourier transform spatial filtering

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359559, 359565, 359615, 359900, 359399, G02B 2746

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active

061010340

ABSTRACT:
Disclosed is a tunable multispectral optical apparatus for forming a spectrally processed image of a scene having finite angular extent or alternatively a point source of light, both of which may include multispectral components. A spatial filter is selectively positioned between a hybrid fore-optic and a hybrid reimaging optic, both of which include a diffractive optic. Spectral selectivity is obtained by proper positioning of the spatial filter relative to the intermediate image formed by the hybrid fore-optic before impinging on the hybrid reimaging optic. The tunable multispectral optical apparatus of the present invention may take the form of a bandpass filter or a bandstop filter depending only on the choice of spatial filter--blocking or passing selective wavelength components of the intermediate image.

REFERENCES:
patent: 3185021 (1965-05-01), Thompson
patent: 3563659 (1971-02-01), Thompson
patent: 3821794 (1974-06-01), Yoneyama
patent: 4965441 (1990-10-01), Picard
patent: 5444236 (1995-08-01), Ludington et al.
patent: 5610734 (1997-03-01), Aharoni et al.
N. K. Shi, "Color-Sensitive Spatial Filters," Optics Letters, vol. 3, No. 3, pp. 85-87, Sep. 1978.

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