25 December 1979 Low-Cost High-Resolution Spectral Measurements Of Solar And Atmospheric Lines Using A Commercially Available Scanning Interferometer
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Abstract
A technique is described for using a commercially available scanning Fabry-Perot interferometer and a low resolution monochrometer to measure solar rotation produced doppler shifts. A Spectra Physics, Model 380, Scanning Fabry-Perot Interferometer with a reflectivity finesse of greater than 150 was followed with a Heath EU-700, 350 mm Czerny-Turner monochrometer, used as an order separator. The output of the photomultiplier was displayed on an oscilloscope, and the spectral data was obtained photographically. The horizontal sweep of the oscilloscope was used as the driving ramp voltage for the z-axis pizzoelectric stack of the scanning interferometer. Using the known wavelengths of atmospheric 02 lines for calibration, doppler shifts of less than .001 nm were detectable. In order to obtain a flat output without interferometer order overlap, an interferometric mirror separation of .75 mm (0.265 nm free spectral range) was used with a monochrometer slit width of 125 um (2.0 nm/mm dispersion). The monochrometer was centered on the .2 nm spectral region of interest at 630.2 nm. An apparent overall finesse of about 100 was realized.
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Rufus E. Bruce, J. Elon Graves, "Low-Cost High-Resolution Spectral Measurements Of Solar And Atmospheric Lines Using A Commercially Available Scanning Interferometer", Proc. SPIE 0192, Interferometry, (25 December 1979); doi: 10.1117/12.957863; https://doi.org/10.1117/12.957863
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