title: In-line fiber étalon for strain measurement.
abstract: A description and demonstration of a fiber interferometer that uses a short segment of silica hollow-core fiber spliced between two sections of single-mode fiber to form a mechanically robust in-line cavity are presented. The hollow-core fiber is specifically manufactured to have an outer diameter that is equal to the outer diameter of the single-mode lead fibers, thereby combining the best qualities of existing intrinsic and extrinsic Fabry-Perot sensors. A dynamic strain resolution of ~22 nepsilon/ radicalHz at frequencies of >5 Hz with a sensor gauge length of 137 microm is demonstrated.
authors.forename: J S
authors.initials: JS
authors.lastname: Sirkis
authors.forename: D D
authors.initials: DD
authors.lastname: Brennan
authors.forename: M A
authors.initials: MA
authors.lastname: Putman
authors.forename: T A
authors.initials: TA
authors.lastname: Berkoff
authors.forename: A D
authors.initials: AD
authors.lastname: Kersey
authors.forename: E J
authors.initials: EJ
authors.lastname: Friebele