A Michelson-based fiber-optic low-coherence interferometric quasi-distributed sensing system permitting absolute length measurement in a sensor array is proposed. The main part of the sensing system is a fiber-optic 3×3 star coupler. The architecture of fiber-optic sensors can be easily realized as a linear sensor array, twin sensor arrays, or a loop sensor array. The proposed sensing scheme will be useful for the measurement of strain distribution. An important application could be deformation sensing in smart structures. A six-sensor array is demonstrated experimentally.
© 2005 Optical Society of America
Libo Yuan and Jun Yang, "Schemes of a fiber-optic multiplexing sensor array based on a 3×3 star coupler," Opt. Lett. 30, 961-963 (2005)