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Digital Fringe Counting for Intrinsic Fabry-Perot InterferometersA 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.
Document ID
19960047682
Acquisition Source
Legacy CDMS
Document Type
Abstract
Authors
Froggatt, Mark (NASA Langley Research Center Hampton, VA United States)
Melvin, Leland (NASA Langley Research Center Hampton, VA United States)
Date Acquired
August 17, 2013
Publication Date
March 1, 1996
Publication Information
Publication: Proceedings of the 4th Annual Workshop: Advances in Smart Materials for Aerospace Applications
Subject Category
Optics
Accession Number
96N33292
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19960047656Collected WorksProceedings of the 4th Annual Workshop: Advances in Smart Materials for Aerospace Applications
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