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- W2016350979 abstract "Upper atmospheric winds have been measured for many year by the detection of the Doppler shifts of airglow emission lines using both Fabry-Perot and Michelson interferometers. The Michelson is usually used in a field-widened configuration with the path difference set at a large value. Filters isolate a single emission line and the Doppler shifts are manifested as phase shifts of the interferometric fringes. The phase shifts are measured by sampling the fringe at four points separated by about one-quarter wavelength in path difference. One problem with the technique is that the phase is subject to error if the source intensity varies while the four exposures are made. A solution is to divide one Michelson mirror into four quadrants, with a different coating on each quadrant, in order to provide the four fringe samples simultaneously. This method is proposed for WAMI, the Michelson instrument in the WAVES proposal. The technique of sampling a fringe at four points simultaneously while imaging is discussed and demonstrated. A laser source is Doppler shifted using a spinning disk and the velocities measured interferometrically agree with the known speed of the disk within statistical error." @default.
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- W2016350979 date "2001-05-15" @default.
- W2016350979 modified "2023-10-15" @default.
- W2016350979 title "Divided mirror technique for measuring Doppler shifts with a Michelson interferometer" @default.
- W2016350979 doi "https://doi.org/10.1117/12.426964" @default.
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