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Full-Text Articles in Physics
How Big Is Our Sun?, Mark Moldwin
How Big Is Our Sun?, Mark Moldwin
Aerospace, Physics, and Space Science Faculty Publications
Putting large numbers into human perspective by using ratios of a known quantity to an unknown quantity is an important scientific skill. An astronomy activity that encourages the use of estimation and helps students get a handle on large numbers is the making of a scale model of Earth and Sun that is relative in both size and distance.
Enhanced Three-Dimensional Reconstruction Of Surfaces Using Multicolor Gratings, Bernard S. Gilbert, Joel H. Blatt
Enhanced Three-Dimensional Reconstruction Of Surfaces Using Multicolor Gratings, Bernard S. Gilbert, Joel H. Blatt
Aerospace, Physics, and Space Science Faculty Publications
Most optical topolography systems use a single-wavelength laser for projection, using a swept spot, a moving line, or a projected grating. In a typical projected grating system, the gratings are shifted and a series of images is used to recover the 3-D shape of the target. When the series of images is analyzed in the normal phase shift manner, the resulting 2-D phase map typically has phase unwrapping problems due to noise and Nyquist limits. Surfaces with large vertical discontinuities present a problem for phase unwrapping 3-D shape recovery. We look at simultaneously projecting multiple wavelengths onto a surface to …