Other

USA As Represented by Secretary of the Navy

Johns Hopkins University

James W Wagner

Ralph F Cohn

C Gilbreath-Frandsen

An engine block mount for use in holding engine blocks in a secure manner during cylinder boring is disclosed. The engine block mount includes an electromechanical clamping system that has a hydraulic system for balancing the pressure exerted on an engine block. The engine block mount can also include an open table top that allows a variety of boring tools to be utilized. The open table top version of the engine block mount includes sliding parallels which are secured in place during operation of the engine block mount by the hydraulic system.

Engine block mount

Dynamic imaging microellipsometry (DIM) is a rapid full-field imaging technique for high resolution studies of thin-films. The DIM concept is based on radiometric polarizer, compensator, specimen, analyzer (PCSA) ellipsometry combined with video and image processing techniques. The theoretical basis for this approach is developed using the Jones vector and matrix formalism. Basic systems design is presented with error model predictions of ellipsometric accuracies better than 0.1.degree. for full-field .psi. and .DELTA. images captured in a few seconds with spatial resolution under 10 microns.

Dynamic imaging microellipsometry

A method for producing desired changes in a beam of coherent light radiating at .lambda..sub.1, comprising the steps of (a) splitting a beam of coherent light radiating at .lambda..sub.1, correcting one of the beams to achieve a desired wavefront and recombining this beam with the first, where a record medium (I) is placed such that the beams are separated by an angle determined by Bragg's law and the line spacing of the interference pattern formed by the two beams; (b) developing the first medium such that a diffraction grating of spacing d.sub.1 is recorded in a material, specifically sensitive to .lambda..sub.1, which will become the master; (c) illuminating the master with a second wavelength, .lambda..sub.2, selected by choice of a second medium which possesses very high diffraction efficiency. The second beam is split into two parts. The first is directed to the master. This diffracted order is recombined with the second beam. These beams are separated by an angle determined by Bragg's law and the line spacing of the interference pattern formed by the two beams. The record of the second medium (II) is placed at this juncture. A second grating with grating spacing d.sub.2 is recorded in this medium containing a record of the first hologram diffracted from the master, which forms the working hologram; and (d) illuminating the working hologram with the original beam at .lambda..sub.1 at an incidnece angle specific to the grating spacing d.sub.2 and .lambda..sub.1, wherein the desired wavefront at .lambda..sub.1 is diffracted.

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Annapolis, MD, United States of America

James W Wagner