title: Static FBG strain sensor with high resolution and large dynamic range by dual-comb spectroscopy.
abstract: We demonstrate a fiber Bragg grating (FBG) strain sensor with optical frequency combs. To precisely characterize the optical response of the FBG when strain is applied, dual-comb spectroscopy is used. Highly sensitive dual-comb spectroscopy of the FBG enabled strain measurements with a resolution of 34 nε. The optical spectral bandwidth of the measurement exceeds 1 THz. Compared with conventional FBG strain sensor using a continuous-wave laser that requires rather slow frequency scanning with a limited range, the dynamic range and multiplexing capability are significantly improved by using broadband dual-comb spectroscopy.
authors.affiliation: The Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan. naoya@issp.u-tokyo.ac.jp
authors.forename: Naoya
authors.initials: N
authors.lastname: Kuse
authors.forename: Akira
authors.initials: A
authors.lastname: Ozawa
authors.forename: Yohei
authors.initials: Y
authors.lastname: Kobayashi
mesh_terms: D055119:Elastic Modulus; D004867:Equipment Design; D019544:Equipment Failure Analysis; D012031:Refractometry / Q000295:instrumentation*; D013057:Spectrum Analysis / Q000295:instrumentation*; D013314:Stress, Mechanical