Common-aperture multispectral objective

Details Common-aperture multispectral objective Common-aperture multispectral objective

2007-07-24

2007-07-24

Nguyen, Thong Q. (Department: 2872)

Optical: systems and elements

Having significant infrared or ultraviolet property

Having folded optical path

C359S357000, C359S634000

Reexamination Certificate

active

11158353

ABSTRACT:
A common-aperture, multispectral device uses a folded beamsplitter to simultaneously image near infrared (NIR) and long wave infrared (LWIR) spectral bands. The folded-path optical design makes the sensor extremely compact and lightweight without compromising the F/# or field of view. The design is split into two channels; a NIR channel and a LWIR channel. A Zinc Sulfide environmental window provides the input to the device. The input first is split into the two channels via a Germanium (Ge) beam-splitter. For the NIR Channel, the input is focused directly onto a faceplate through a series of optics. For the LWIR Channel, the input is focused onto the Ge window via a folded design including a first Ge lens, a fold mirror, and then a second Ge lens. From the faceplate of the NIR channel and the Ge window of the LWIR channel, the input is then processed by respective focal planes.

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patent: 6781127 (2004-08-01), Wolff et al.
patent: 6999231 (2006-02-01), Bryant

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