Sensitivity of an extrinsic Fabry-Perot interferometric sensor with respect to the alignment direction of the sensor for detecting lamb waves

Dae-Hyun Kim; Young-Han Kim; Chun-Gon Kim

doi:10.1117/12.658858

30 March 2006 Sensitivity of an extrinsic Fabry-Perot interferometric sensor with respect to the alignment direction of the sensor for detecting lamb waves

Dae-Hyun Kim, Young-Han Kim, Chun-Gon Kim

Author Affiliations +

Proceedings Volume 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications; 61670P (2006) https://doi.org/10.1117/12.658858
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2006, San Diego, California, United States

Abstract

Lamb wave is a good method to detect some imperfections in a thin plate. In order to use this method, a sensor as well as an actuator is needed. Usually, a piezoceramic transducer is a good sensor and also a good actuator. Nowadays, fiber optic sensors are good alternative transducers for detecting Lamb wave as well as other ultrasonic waves. However, in the case of the fiber optic sensor, its sensitivity has directivity; that is, the sensitivity is variable according to the alignment direction of the sensor because the sensor dominantly measures the displacement induced by the change of gage length along the parallel direction to the sensor. Thus, considering the change of the sensitivity with respect to the alignment direction of the sensor to an ultrasonic source is essential in order to detect the ultrasonic wave using a fiber optic sensor and to determine the absolute amount of the measured value correctly. In this paper, the directivity of the fiber optic sensor was investigated through both a theoretical analysis and an experimental one. The theoretical analysis showed that the sensitivity was related to the alignment angle of the sensor and to the ratio (L/λ)of the gage length (L) of the sensor and the wavelength (λ) of the Lamb wave. In the experimental analysis, an extrinsic Fabry-Perot interferometric sensor was used for detecting the Lamb waves which were excited by a lot of piezoceramic transducers. One fiber optic sensor was attached on the center of the aluminum plate; otherwise these piezoceramic transducers were attached around the fiber optic sensor according to the alignment direction of the fiber optic sensor. Finally, the theoretical results were verified in the experimental analysis.

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Dae-Hyun Kim, Young-Han Kim, and Chun-Gon Kim "Sensitivity of an extrinsic Fabry-Perot interferometric sensor with respect to the alignment direction of the sensor for detecting lamb waves", Proc. SPIE 6167, Smart Structures and Materials 2006: Smart Sensor Monitoring Systems and Applications, 61670P (30 March 2006); https://doi.org/10.1117/12.658858

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KEYWORDS

Sensors

Fiber optics sensors

Actuators

Ultrasonics

Optical alignment

Transducers

Aluminum

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