Method and system for multi-spectral imaging in the visible and

Details Method and system for multi-spectral imaging in the visible and Method and system for multi-spectral imaging in the visible and

1995-11-28

1998-07-14

Dzierzynski, Paul M.

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359350, 359356, 359793, 359771, 359754, G02B 1314, G02B 904, G02B 900, G02B 934

Patent

active

057813361

ABSTRACT:
Multi-spectral images are detected using a refractive objective lens system. Magnesium oxide (MgO) and calcium fluoride (CaF.sub.2) lenses are used to image scenes in both the visible and infra-red (IR) spectrums. The inventors have discovered that the combination of magnesium oxide, only recently made available in a pure crystal form, and calcium fluoride can be used to fabricate an objective lens for imaging objects in both the visible and infra-red spectrums. Moreover, the combination of magnesium oxide and calcium fluoride results in a super-achromatic condition across visible and infra-red spectrums. This chromatically-corrected spectral range includes wavelengths between 0.4 and 5.9 microns which covers medium-wave IR (MWIR), short-wave IR (SWIR), and the near-IR/visible windows. Combinations of MgO and CaF.sub.2 lenses are used in different compound objective lens designs including doublet, Petzval, inverted telephoto, and telephoto arrangements. Visible and/or IR applications for the multi-spectral objective lens system include telescopes, reconnaissance planes, satellites, forward-looking IR (FLIR) and staring sensor systems, night-vision goggles, and other optic and/or electro-optic detection systems.

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