title: Mach-zehnder and modified sagnac-distributed fiber-optic impact sensor.
abstract: An interferometric technique is described to detect and locate perturbations along an optical fiber. This distributed sensor has a position-dependent response to time-varying disturbances such as strain or temperature. A modified Sagnac interferometer configuration that incorporates an additional coupler and a mirror allows separation of the Sagnac and the Mach-Zehnder signals. Operation of the new configuration was verified experimentally with a 100-m-long sensing fiber. The discrepancy between actual and measured locations of disturbances applied to the fiber did not exceed 0.6 m.
authors.forename: A A
authors.initials: AA
authors.lastname: Chtcherbakov
authors.forename: P L
authors.initials: PL
authors.lastname: Swart
authors.forename: S J
authors.initials: SJ
authors.lastname: Spammer