菊地啓太君（M1）の研究成果で、英語版プレスリリース「Innovative method enhances Brillouin optical fiber sensing for infrastructure monitoring」を配信しました。
Brillouin scattering is the phenomenon of the inelastic scattering of light by thermally generated acoustic vibrations. Brillouin-based optical fiber sensing can be used to measure temperature and strain distributions by determining how the light scatters in the presence of various stimuli. This method is particularly effective when applied to correlation-domain techniques, such as Brillouin optical correlation-domain analysis and Brillouin optical correlation-domain reflectometry (BOCDR), which provide high spatial resolution and random accessibility to various measurement points. BOCDR, which utilizes spontaneous Brillouin scattering, enables single-end accessibility, making it a versatile tool for sensing applications.
In BOCDR, the spatial resolution is determined by the modulation amplitude and frequency of the light. Accurate measurement of modulation amplitude, which correlates to the peak light intensity, typically requires costly and bulky equipment like optical spectral analyzers or heterodyne detection systems. These requirements complicate the experimental setup and increase costs.
A group of researchers from Japan, led by Associate Professor Heeyoung Lee from Shibaura Institute of Technology (SIT) and including Keita Kikuchi, also from SIT, and Yosuke Mizuno from Yokohama National University, recently developed……
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