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Characteristics Investigation and Design of the Mandrel for Fiber Optic Acoustic Sensor  

Lee, Jongkil (Mechanical Engineering Education, College of Education, Andong National University)
Ha, Tae-Hyun (Mechanical Engineering Education, Graduate School of Education, Andong National University)
Lee, June-Ho (Department of Electrical Engineering, Hoseo University)
Publication Information
대한공업교육학회지 / v.34, no.2, 2009 , pp. 331-345 More about this Journal
Abstract
In this research Sagnac interferometer three different types of mandrel are suggested and this fiber optic sensor is using in monitoring of electric transformer. Vibration characteristics of those mandrels were analyzed and finally more sensitivity mandrel are suggested. Three different mandrels using in fiber optic sensor are hollow cylinder with outer bump, pure hollow cylinder, hollow cylinder with inner bump. Natural frequencies and mode shapes are investigated using finite element method. Mode shape are considered at the frequency range from 2 kHz to 20 kHz. Fundamental dimensions of the hollow cylinder type's mandrel are 30 mm in outer diameter, 50 mm in length, 1 mm in cylinder thickness, $2mm{\times}2mm$ in bump size. Based on the finite element results, when the outer acoustic frequency is near 11 kHz outer bump type and hollow cylinder can get higher sensitivity. Near 17 kHz outer bump and inner bump mandrel can get higher sensitivity. Near 20 kHz hollow cylinder and inner bump mandrel is useful. This results can be applied to design of fiber optic sensor using in monitoring the electrical transformer. Several MHz of outer acoustic frequency can be easily detected using more sensitive mandrel in pursuing expand this technique.
Keywords
Mandrel; Fiber optic acoustic sensor; Natural frequency; Mode shape; Sensitivity;
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Times Cited By KSCI : 2  (Citation Analysis)
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