title: Detector for an optical-fiber acoustic sensor using dynamic holographic interferometry.
abstract: It is shown that the acoustically induced phase modulation of coherent light propagating within a multimode optical fiber may be linearly detected by an interferometer employing an unmodulated replica of the fiber beam as the reference. It is proposed that a dynamic hologram provide such a reference. This technique allows a performance comparable with that of a monomode interferometric sensor to be obtained, but with considerably relaxed alignment tolerances.
authors.affiliation: Department of Physics, Queen Elizabeth College, Campden Hill Road, London W8 7AH, UK.
authors.forename: T J
authors.initials: TJ
authors.lastname: Hall
authors.forename: M A
authors.initials: MA
authors.lastname: Fiddy
authors.forename: M S
authors.initials: MS
authors.lastname: Ner