Low Power, Low Cost, Lightweight, Multichannel Optical Fiber Interrogation Unit for Structural Health Management of Rotor Blades
Navy SBIR FY2015.1


Sol No.: Navy SBIR FY2015.1
Topic No.: N151-006
Topic Title: Low Power, Low Cost, Lightweight, Multichannel Optical Fiber Interrogation Unit for Structural Health Management of Rotor Blades
Proposal No.: N151-006-0474
Firm: SA Photonics
120 Knowles Dr.
Los Gatos, California 95032
Contact: Frank Muennemann
Phone: (650) 434-2779
Abstract: This proposal describes a compact fiber-optic strain interrogator and data logging system suitable for installation with the rotating components of helicopters. The system uses Brillouin scattering in an optical fiber to track fiber strain and the corresponding strain in material where the fiber is embedded. The objective is to monitor the mechanical condition of high-stress parts such as rotor blades while the aircraft is in flight. Rotor blade stress information accumulated this way will be available wirelessly to maintenance crews, and will support a condition-based maintenance program. The interrogator is highly self-contained and configurable to acquire as much data as possible using limited power available to it through energy harvesting.
Benefits: The instrument's deployment to the Department Of Defense (DOD) and to DOD contractors will enhance the effectiveness and reduce the cost of maintaining helicopters and other rotorcraft. With logged data available wirelessly, aircraft maintenance personnel will be enabled to track the effects of component wear, fatigue processes and damage.

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