Nonmechanical microscanning using optical space-fed phased arrays

Kenneth J. Barnard; Edward A. Watson; Paul F. McManamon

doi:10.1117/12.180071

8 July 1994 Nonmechanical microscanning using optical space-fed phased arrays

Kenneth J. Barnard, Edward A. Watson, Paul F. McManamon

Proceedings Volume 2224, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing V; (1994) https://doi.org/10.1117/12.180071
Event: SPIE's International Symposium on Optical Engineering and Photonics in Aerospace Sensing, 1994, Orlando, FL, United States

Abstract

A method for microscanning in imaging sensors is developed that allows liquid-crystal beam steerers to be used as nonmechanical microscan devices. This submicroscanning method involves using liquid-crystal beam steerers to shift images on a focal plane array by a fraction of the amount used in typical microscan methods. Interpolation techniques based on interlaced sampling are used to produce images free of aliasing out to twice the Nyquist frequency determined by the focal plane array. Since a continuous phase ramp is produced by the liquid-crystal beam steerer, dispersion effects due to the grating-like nature of the devices are avoided. Simulations for both 1D and 2D cases are presented, as well as experimental results using a 3 to 5 micrometers imaging sensor and a liquid-crystal beam steerer designed for operation at 1.064 micrometers .

Citation Download Citation

Kenneth J. Barnard, Edward A. Watson, and Paul F. McManamon "Nonmechanical microscanning using optical space-fed phased arrays", Proc. SPIE 2224, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing V, (8 July 1994); https://doi.org/10.1117/12.180071

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