Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1990. / Vita. Abstract. Includes bibliographical references (leaves 118-120). Also available via the Internet.

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 70-72). Also available via the Internet.

Real-time holography using an active optical heterodyne scanning technique for recording and electron beam addressed spatial light modulator-based reconstruction has recently been studied and demonstrated. Advances in this area are presented in this thesis. For the first time, holograms of two dimensional objects have been recorded and two-dimensional images have been reconstructed using this system. The ability to digitally store holograms recorded by this method has been added to the system. This capability increases the robustness of the overall system and allows for digital processing of the holograms for improved reconstruction. Nonlinear digital processing for fringe contrast enhancement is demonstrated. The use of an intermediate display process has previously been identified as a major drawback in the real-time optical scanning holographic system. A digital frame memory is introduced into the system, eliminating the need for the intermediate display process, and thus improving the system. The two systems are compared. / Master of Science

A state feedback control system for flexible structures implemented using a holographic sensor and optical processor is presented. Real-time holography provides a mechanism for sensing the distributed shape of a broad class of one and two-dimensional flexible structures in a form that can be processed using fixed optics. The optical processing solves the spillover problem in the theory of the control of flexible structures. The optical processing also simplifies the computation allowing the state feedback control of a large number of vibrational without a digital computer. The combination of holographic sensing and optical processing provides a potential solution to both the spillover and computation problems in the control of flexible structures. / Ph. D.