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Journal of Intelligent Material Systems and Structures
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Fiber Sensor Based on Piezoelectric Ultrasonic Wave

Il-Kwon Oh

School of Mechanical Systems Engineering, Chonnam National University 300 Yongbong-dong, Buk-gu, Gwangju, 500-757, Republic of Korea, ikoh{at}chonnam.ac.kr

Seung-Hyun Lim

School of Mechanical Systems Engineering, Chonnam National University 300 Yongbong-dong, Buk-gu, Gwangju, 500-757, Republic of Korea

Jung-Ryul Lee

Department of Aerospace Engineering, Chonbuk National University, 664-14 Duckjin-Gu,Jeonju, Chonbuk 561-756, South Korea

Fu-Kuo Chang

Department of Aerospace Engineering, Stanford University, 496 Lomita Mall, Stanford, CA 94305, USA

A piezoelectric ultrasonic sensing system based on an optical fiber has been developed for two-phase flow monitoring. The ultrasonic wave generated from a piezoelectric actuator is guided and propagated in the optical fiber and then sensed by a piezoelectric sensor located at the other end of the fiber. The sensed signal can be influenced by environmental and physical changes around the optical fiber. For this study, the sensitivity of the optical fiber sensor is experimentally studied according to the system parameters, such as fiber coating, frequency, and the number of cycles of the input voltage signal to the piezoelectric actuator. The developed sensing system is applied for monitoring the void fraction of the two-phase flow and the feasibility as a two-phase flow monitoring system is demonstrated.

Key Words: optical fiber • ultrasonic wave • piezoelectric transducer • void fraction.

This version was published on March 1, 2008

Journal of Intelligent Material Systems and Structures, Vol. 19, No. 3, 299-304 (2008)
DOI: 10.1177/1045389X07083126
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