Open AccessHigh-speed range and velocity measurement using frequency scanning interferometry with adaptive delay lines [Invited]
Author(s) -
Christos A. Pallikarakis,
Jonathan M. Huntley,
Pablo D. Ruiz
Publication year - 2020
Publication title -
journal of the optical society of america. a, optics, image science, and vision./journal of the optical society of america. a, online
Language(s) - English
Resource type - Journals
eISSN - 1520-8532
pISSN - 1084-7529
DOI - 10.1364/josaa.403858
Subject(s) - optics , interferometry , displacement (psychology) , physics , interference (communication) , range (aeronautics) , resolution (logic) , white light interferometry , materials science , computer science , psychology , channel (broadcasting) , electrical engineering , artificial intelligence , composite material , psychotherapist , engineering
Range (i.e., absolute distance), displacement, and velocity of a moving target have been measured with a frequency scanning interferometer that incorporates a 100,000 s c a n s -1 vertical-cavity surface-emitting laser with 100 nm tuning range. An adaptive delay line in the reference beam, consisting of a chain of switchable exponentially growing optical delays, reduced modulation frequencies to sub-gigahertz levels. Range, displacement, and velocity were determined from the phase of the interference signal; fine alignment and linearization of the scans were achieved from the interferogram of an independent reference interferometer. Sub-nanometer displacement resolution, sub-100-nm range resolution, and velocity resolution of 12µ m s -1 have been demonstrated over a depth measurement range of 300 mm.