Bulletin of the American Physical Society
Joint Fall 2011 Meeting of the Texas Sections of the APS, AAPT, and Zone 13 of the SPS
Volume 56, Number 7
Thursday–Saturday, October 6–8, 2011; Commerce, Texas
Session D7: SPS/Undergraduate Abstracts I |
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Chair: Gary White, American Institute of Physics Room: Science Building 123 |
Friday, October 7, 2011 1:40PM - 1:52PM |
D7.00001: Simulation of a Null ellipsometer and a modulating ellipsometer using Mathcad Cynthia Montgomery, Wilhelmus Geerts We developed MathCad worksheets that demonstrate the working of a null Ellipsometer and a modulating Ellipsometer. The worksheet of the null ellipsometer begins with the definition of the Jones matrices for the polarizer, the quarter wave plate, the sample, and the analyzer, followed by calculations of the Jones vectors of the light reflecting of the sample and the light incident upon the detector. The optimum polarizer and analyzer angles that will null the light through the instrument are determined graphically or by two while-loops on the worksheet. Delta and Psi are calculated from those angles and compared to theoretical values. The worksheet for the modulating ellipsometer begins with the definition of the Jones matrices of the polarizer, the sample, the photo-elastic modulator, and the analyzer. From the Jones vector of the light incident upon the detector, the time dependence of the intensity is calculated. The lock-in amplifiers are employed by determining the 1st and 2nd harmonics of the intensity signal. Delta and Psi are calculated from those Fourier coefficients and compared with the values found from the Fresnel coefficients. [Preview Abstract] |
Friday, October 7, 2011 1:52PM - 2:04PM |
D7.00002: Use of the Wilson-Devinney Code on Transiting Exoplanets Andrew Kocurek The Wilson Devinney code was originally developed to analyze binary star data. Today however, many exoplanets are being discovered every month thanks to the Kepler Satellite. With this new data flow of exoplanets, quick analysis of data is a must. Although the Wilson-Devinney code was not programmed with the intent on exoplanet analysis, it will be shown that this program can be used for exoplanet analysis barring a few restrictions. [Preview Abstract] |
Friday, October 7, 2011 2:04PM - 2:16PM |
D7.00003: Freely available software for undergraduate astronomy research David Craig As part of the ALFALFA project fostering undergraduate research in astronomy, we have begun to explore the use of freely available tools such as TOPCAT and SPLAT, which are visualization and data analysis tools for most of the common file formats used in research astronomy. They have some capabilities also found in systems such as IDL and IRAF, and also feature internet connectivity to large databases such as SDSS, VizieR and many others. Use of these tools in a collaborative research website will be discussed, and they will be briefly demonstrated. [Preview Abstract] |
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