Development of a new fiber optic vibration sensor and its application to structural health monitoring of composite structures

Kageyama, Kazuro; Ohsawa, Isamu; Kanai, Motomu; Machijima, Yuichi; Matsumura, H.; Nagata, Keiichi

doi:10.1117/12.484099

Cited by 6 publications

(6 citation statements)

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“…Some of the present authors have found a similar effect observed in a light wave transmitted through a bent optical fiber. Our new finding is that frequency of a light wave transmitted through a curved optical fiber is shifted in response to vibration/motion of the curved region (Kageyama et al 2003). The phenomenon can be explained as follows.…”

Section: Doppler Effect In Curved Light Waveguidementioning

confidence: 90%

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Acoustic emission monitoring of a reinforced concrete structure by applying new fiber-optic sensors

Kageyama¹,

Murayama²,

Ohsawa³

et al. 2005

Smart Mater. Struct.

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A novel fiber-optic sensor has been developed based on a newly found principle, the 'Doppler effect in a curved light waveguide'. Excellent performance of the circular loop sensor has been obtained. The circular loop sensor can detect the sum of principal strain rate with extremely high sensitivity and very wide frequency range. The sensitivity of the sensor was experimentally examined and the theoretical value was confirmed. The sensor was applied to damage detection in a reinforced concrete structural model of a railway girder. The protected sensor system was developed in order to improve the survivability during the structural test. In total 25 sensors were applied to the structural model. The developed fiber-optic sensors have shown almost equivalent sensitivity to conventional PZT sensors and much wider frequency range than resonance type PZT sensors. Initiation and propagation of cracks in the reinforced concrete have been analyzed by using the new fiber-optic vibration/acoustic sensing system.

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Section: Doppler Effect In Curved Light Waveguidementioning

confidence: 90%

“…Recently, Kageyama et al (2003) have found a new fiberoptic phenomenon. It is the 'Doppler effect in a curved light waveguide'-the frequency of a light wave transmitted through a curved waveguide is shifted by the motion of the bent region.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission monitoring of a reinforced concrete structure by applying new fiber-optic sensors

Kageyama¹,

Murayama²,

Ohsawa³

et al. 2005

Smart Mater. Struct.

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“…A fiber optic sensor has many unique characteristics compared to traditional sensors, such as small diameter and light weight, high sensitivity, flexibility, high strength, heat-resistance, immunity to electromagnetic interference and durability and corrosive resistance etc. [2] . It has become a valid tool for measuring in awful situation due to the advantages described above.…”

Section: Introductionmentioning

confidence: 95%

A high-speed realtime vibration measusement and analysis system based on DSP technology

Song

Wang

2006

SPIE Proceedings

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A real-time vibration measurement and analysis system based on fiber optic sensor and high-speed DSP processor is introduced. Measurement is emphasized in recent engineering field for checking the bearable capability of objects on vibration. Real-time processing ability, testing accuracy and dynamic testing range are crucial aspects in a measurement and analysis system. Using fiber optic displacement sensor to capture the dynamic measurements during a vibration test is presented. FFT recursion algorithms based on split-radix and twiddle vector is proposed for achieving fast speed frequency analysis of vibration signals. Experiment results show the superiority of the proposed approach compared to the one based on single-chip processor. High speed and real-time testing power is achieved in this system.

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“…We have developed a novel optical fiber vibration sensor [4] and applied commercially available sensors to health monitoring of composite structures [5]. In this study, we constructed an optical fiber network integrating four types of optical fiber sensor into a carbon fiber reinforced plastic (CFRP) panel.…”

Section: Introductionmentioning

confidence: 99%

Development of Smart Composite Panel with Optical Fiber Sensors

Murayama

Kageyama

Ohsawa³

et al. 2005

KEM

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We have developed a novel fiber-optic vibration sensors and applied commercially available strain and temperature sensors to health monitoring of composite structures. In this study, we constructed an optical fiber network integrating four types of optical fiber sensor into a carbon reinforced plastic (CFRP) panel. These four sensors were the vibration sensor developed by our laboratory, two distributed sensors based on Brillouin and Raman backscattering and Fiber Bragg Grating (FBG) sensors. By dealing the data obtained from the measurement systems corresponding to these four sensors, strain/stress and temperature distributions throughout the panel can be monitored. Vibration and elastic waves transmitting on the panel are also detected at several sensing points. Furthermore, we will be able to determine damage locations and modes by processing the wave signals. To make the panel with the optical fiber sensor network more sensitive and smarter, we are developing some techniques that can improve the performance of the sensors and can assess the structural integrity by analyzing measurement results. In this paper, the development of the first generation of our smart composite panel with the optical fiber sensors is described and the techniques making the panel more sensitive and smarter are also described.

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Development of a new fiber optic vibration sensor and its application to structural health monitoring of composite structures

Cited by 6 publications

References 0 publications

Acoustic emission monitoring of a reinforced concrete structure by applying new fiber-optic sensors

Acoustic emission monitoring of a reinforced concrete structure by applying new fiber-optic sensors

A high-speed realtime vibration measusement and analysis system based on DSP technology

Development of Smart Composite Panel with Optical Fiber Sensors

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