http://ionetrics.org/ 2012-05-19T23:02:17-05:00 http://ionetrics.org/ http://ionetrics.org/lib/images/favicon.ico text/html 2010-06-29T10:05:50-05:00 Tim Bratcher http://ionetrics.org/edgar:igrams2spectra?rev=1277823950&do=diff The following procedure is used to compute spectra from raw igrams: * Apodize the input igram using the selected Apodization method * Shift the igram so that zero frequency is the first element in the data array * If necessary, zero fill the igram array so the number of elements is an exact power of 2 * Apply the FFT function * Extract the positive frequencies as the spectrum for the given input igram ’ text/html 2010-06-02T13:13:06-05:00 Tim Bratcher http://ionetrics.org/edgar:compute_spectrum?rev=1275502386&do=diff The Compute Spectrum panel provides input fields and controls for generating calibrated or uncalibrated spectra from raw igram files. The Compute Spectrum panel is accessed by pressing the Compute Spectrum tab on the right side of the Edgar window. The Compute Spectrum operation can be performed on raw igrams with no calibration to generate output in arbitrary units, or a two-point calibration can be applied to produce calibrated spectra. Computations can be performed on a single subfile, or … text/html 2010-06-02T13:05:41-05:00 Tim Bratcher http://ionetrics.org/edgar:fileformats?rev=1275501941&do=diff Raw output files can be written out in one of three Grams/SPC formats: 16-bit fixed point, 32-bit fixed point, or 32-bit floating point. Edgar can read files stored in any of these formats, but some versions of Grams have trouble reading 16-bit files if the igram size is greater than 16384 points, so data collected at 1 cm-1 may not import correcty into Grams. Also, Acquire can only read in 32-bit floating point files. text/html 2010-05-21T15:32:38-05:00 Tim Bratcher http://ionetrics.org/edgar:versions?rev=1274473958&do=diff v1.0 * The Java runtime delivered with Edgar has been updated to v6u20 * New automatic file naming schemes (Auto by Time, Auto Increment, Eight-3) * New display window with enhanced navigation and zoom controls and support for multiple curves within a single window * Support for instruments with dynamic alignment of the interferometer optics * Housekeeping module to monitor instrument vitals (uses 1-wire technology) * Matlab MAT-file output option (files generated by Edgar can now b… text/html 2010-03-30T10:15:44-05:00 Tim Bratcher http://ionetrics.org/edgar:statuspanel?rev=1269962144&do=diff The Status panel provides real-time detector and scan status information for live instruments. Information presented for each scan includes detector names, spectral range, gain, minimum and maximum signal levels, scan number, direction, size, ZPD location, scan rate, and IRIG time stamp. Temperature information is included for systems with an Edgar controlled blackbody.’ text/html 2010-02-17T10:10:08-05:00 Tim Bratcher http://ionetrics.org/edgar:radiometric_correction?rev=1266423008&do=diff The following procedure is used to calculate a complex radiometric correction gain (G) and offset (O): * The Hot Source file is opened and validated. To be a valid source, the file must contain exactly 2 subfiles (forward and reverse igrams). * If the non-linearity correction option is turned on, the hot source igrams (forward and reverse) are corrected for non-linearity, then the forward and reverse hot source spectra are computed. If then non-linearity correction is turned off, the for… text/html 2010-01-22T15:24:01-05:00 Tim Bratcher http://ionetrics.org/wiki:mrupgrade?rev=1264195441&do=diff Unpacking Getting Started Annotator DFT200 FTS Controller Firmware