Grating angle magnification enhanced angular sensor and scanner

An angular magnification effect of diffraction is exploited to provide improved sensing and scanning. This effect is most pronounced for a normal or near-normal incidence angle in combination with a grazing diffraction angle, so such configurations are preferred. Angular sensitivity can be further enhanced because the width of the diffracted beam can be substantially less than the width of the incident beam. Normal incidence configurations with two symmetric diffracted beams are preferred, since rotation and vertical displacement can be readily distinguished. Increased sensitivity to vertical displacement can be provided by incorporating an interferometer into the measurement system. Quad cell detectors can be employed to provide sensitivity to rotation about the grating surface normal. A 2-D grating can be employed to provide sensitivity to angular displacements in two different planes (e.g., pitch and yaw). Combined systems can provide sensitivity to vertical displacement and to all three angular degrees of freedom

The first Chinese student space shuttle getaway special program

The first Chinese Getaway Special program is described. Program organization, the student proposal evaluation procedure, and the objectives of some of the finalist's experiments are covered. The two experiments selected for eventual flight on the space shuttle are described in detail. These include: (1) the control of debris in the cabin of the space shuttle; and (2) the solidification of two immiscible liquids in space

A Computation Model for Nanoantenna-based Solar Cell with High Conversion Efficiency

Build a model of spiral nanoantenna and an antennaarray based solar cell collector. Using Rao-Wilton-Glisson (RWG) basis functions tosimulate the spiral nanoantennas. We calculate the frequency response of the radiationgain as the indicator of receiving bandwidth which is akey factor in conversion efficiency

Establishing a Center of Excellence for Security Science and Engineering

Outline • Introduction • Progress report • NNSA proposal to establishCenter of Excellence for Security Science and Engineering • Perspective on UNLV-NSTec collaboratio