| 摘要 |
The disclosure describes a common-aperture, multispectral device that uses folded beamsplitters in the sensor to provide the capability to simultaneously image the 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 (ZnS) 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 to 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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