Hierarchical structural health monitoring system combining a fiber optic spinal cord network and distributed nerve cell devices

Shu Minakuchi; Haruka Tsukamoto; Nobuo Takeda

doi:10.1117/12.815581

7 April 2009 Hierarchical structural health monitoring system combining a fiber optic spinal cord network and distributed nerve cell devices

Shu Minakuchi, Haruka Tsukamoto, Nobuo Takeda

Author Affiliations +

Proceedings Volume 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009; 72930G (2009) https://doi.org/10.1117/12.815581
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

This study proposes novel hierarchical sensing concept for detecting damages in composite structures. In the hierarchical system, numerous three-dimensionally structured sensor devices are distributed throughout the whole structural area and connected with the optical fiber network through transducing mechanisms. The distributed "sensory nerve cell" devices detect the damage, and the fiber optic "spinal cord" network gathers damage signals and transmits the information to a measuring instrument. This study began by discussing the basic concept of the hierarchical sensing system thorough comparison with existing fiber optic based systems and nerve systems in the animal kingdom. Then, in order to validate the proposed sensing concept, impact damage detection system for the composite structure was proposed. The sensor devices were developed based on Comparative Vacuum Monitoring (CVM) system and the Brillouin based distributed strain sensing was utilized to gather the damage signals from the distributed devices. Finally a verification test was conducted using prototype devices. Occurrence of barely visible impact damage was successfully detected and it was clearly indicated that the hierarchical system has better repairability, higher robustness, and wider monitorable area compared to existing systems utilizing embedded optical fiber sensors.

Citation Download Citation

Shu Minakuchi, Haruka Tsukamoto, and Nobuo Takeda "Hierarchical structural health monitoring system combining a fiber optic spinal cord network and distributed nerve cell devices", Proc. SPIE 7293, Smart Sensor Phenomena, Technology, Networks, and Systems 2009, 72930G (7 April 2009); https://doi.org/10.1117/12.815581

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