  We describe a new pushbroom hyperspectral imaging device that has no macro
moving part. The main components of the proposed hyperspectral imager are a
digital micromirror device (DMD), a CMOS image sensor with no filter as the
spectral sensor, a CMOS color (RGB) image sensor as the auxiliary image sensor,
and a diffraction grating. Using the image sensor pair, the device can
simultaneously capture hyperspectral data as well as RGB images of the scene.
The RGB images captured by the auxiliary image sensor can facilitate geometric
co-registration of the hyperspectral image slices captured by the spectral
sensor. In addition, the information discernible from the RGB images can lead
to capturing the spectral data of only the regions of interest within the
scene. The proposed hyperspectral imaging architecture is cost-effective, fast,
and robust. It also enables a trade-off between resolution and speed. We have
built an initial prototype based on the proposed design. The prototype can
capture a hyperspectral image datacube with a spatial resolution of 192x192
pixels and a spectral resolution of 500 bands in less than thirty seconds.
