Cambridge Enterprise Limited

University of California

Ove Arup & Partners International Limited

Cementation Skanska Limited

Kenichi Soga

Jize Yan

Ashwin Arunkumar Seshia

Yu Jia

Duncan Nicholson

Linqing Luo

Bo Li

Yifei Yu

Andrew Bell

Yue Ouyang

A system and method for distributed dynamic strain measurement using optical fiber that is based on Brillouin optical time-domain reflectometry (BOTDR) with stimulated Brillouin scattering (SBS). A short-time Fourier transform (STFT) is used to rebuild the Brillouin frequency shift (BFS) of the SBS scattered signal to perform the dynamic strain measurement.

Distributed dynamic strain fiber optics measurement by Brillouin optical time-domain reflectometry

Fiber optic sensors are used to monitor the integrity of a subsurface concrete structure such as a pile or diaphragm wall. A fiber optic sensor array () is attached to a reinforcement or framework assembly () for the subsurface concrete structure. Concrete is applied to surround the reinforcement or framework assembly () and fiber optic sensor array (). The fiber optic sensor array () is then used to collect temperature data during hydration of the subsurface concrete structure. The temperature data is monitored in real time to determine differentials across the structure, indicative of a problem within the structure.

Method of monitoring subsurface concrete structures

An energy harvester is provided for harvesting energy, and in particular electrical energy from an input vibration such as an ambient vibration. The energy harvester comprises a first mechanical amplifier responsive to the input vibration and a second mechanical amplifier coupled to the first mechanical amplifier. At least one of the first and second mechanical amplifiers comprises a parametric resonator, and a power output of the energy harvester is generated by damping the second mechanical amplifier.

Energy-harvesting apparatus with plural mechanical amplifiers

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Cambridge, United Kingdom

Kenichi Soga