NASA NTRS · 19960047682
Digital Fringe Counting for Intrinsic Fabry-Perot Interferometers
Abstract
A digital dual-wavelength method of demodulating long (17cm) Intrinsic Fabry-Perot Interferometers (IFPI) is presented. The method builds upon previous techniques using small shifts in the lasing wavelength of a laser diode induced by changes in the driving current. The intensity of the light reflected from the IFPI is sampled at two carefully selected values of laser diode drive current. Digital logic is then used to count fringes based upon these two sampled values. Experimental verification of the method is described.
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Froggatt, Mark, Melvin, Leland. 1996-03-01. Digital Fringe Counting for Intrinsic Fabry-Perot Interferometers. https://ntrs.nasa.gov/citations/19960047682
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