We present an investigation of the performance of coded aperture optical systems where the elements of a set of binary
coded aperture masks are applied over a sequence of acquired images. In particular, we are interested in investigating
code sequences and image reconstruction algorithms that reduce the optical fidelity and hardware requirements for the
system. Performance is jointly tied to the mask design, the image estimation algorithm, and the inherent optical response
of the system. As such, we adopt a simplified reconstruction model and consider generalized optical system aberrations
in designing masks used for multi-frame reconstruction of the imagery. We also consider the case of non-Nyquist
sampled (aliased) imagery. These investigations have focused on using a regularized least-squares reconstruction model
and mean squared error as a performance metric. Masks are found by attempting to minimize a closed form objective
that predicts the mean squared error for the reconstruction algorithm. We find that even with suboptimal solutions that
binary masks can be used to improve imagery over the case of an uncoded aperture with the same aberration.
The IR antenna-pair coupled micro-bolometers has demonstrated its unique power response features compared to the single antenna coupled micro-bolometers. The response pattern is determined by that of the single antenna and an interference oscillation term of the antenna-pair with respective to the angle of incidence of the radiation field, and can be steered by shifting the location of the bolometer. This paper explores the potential application of antenna-pair coupled detector in beam synthesis. It describes an array configuration based upon these micro-bolometers, and discusses the corresponding coherent data processing method for the purpose of obtaining response pattern narrowing effects from such an array. This directional gain enhancement, together with the beam steering control, could potentially lead to an array capable of providing a novel IR lensless imaging technique.
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