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 Abe_PSF2 |
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Abe_PSF2 shows how the wavefront shape and the transmission function of an optical system will affect its image blur or point spread function (PSF). Image degradation from wavefront effects such as third-order aberrations (coma, spherical, astigmatism) and defocus, Zernike polynomial coefficients, discontinuous phase errors (waffle, checkerboard, or random), and/or a subaperture phase plate are simulated. Blur growth from transmission losses due to obscurations from secondary mirror struts or a central obscuration are modeled, as well as apodization effects or speckle. The pupil can be round, hexagonal, or rectangular, and system wavelength and f/number are user-selectable. The graphical user interface is intuitive and straightforward. Abe_PSF2 is ideal for high school or college teachers and students interested in science, optics, or astronomy.
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Filesize: 108 K
Downloads: 1308 |
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| Beam Analyzer |
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The Beam Analyzer is a "less is more" type of free engineering program that allows you to model beams for various kinds of loadings and then obtain the deflections and reactions at supports, using finite element method. The small Java-based application runs within your Web browser, providing a basic beam diagram with inputs for length, width, nodes, loadings, and constraints. Although the instructions are minimal, the program wakes up with a sample beam model that makes the product understandable (with a bit of experimentation). A simple Show Results function pops up a frame with the deflections and reactions for the nodes specified. Units are not indicated, so the user must keep track and stay consistent. A full version, which adds the ability to save the beam models and print the stress distribution diagrams, is also available.
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Filesize: 32 K
Downloads: 15258 |
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