The development of high sensitive fiber grating filter and sensor in the applications of displacement measurement for transient wave propagation
Date Issued
2006
Date
2006
Author(s)
Lin, Bo-Ruei
DOI
zh-TW
Abstract
In the measurement of strain field and temperature variation, fiber grating sensor detection technique has been widely used. It has many advantages, such as high sensitivity, low insertion loss, electromagnetic immunity and potentially low cost. The characteristics of fiber grating sensor in sensing static and low frequency response have been frequently reported in the literature. However, in the capability of sensing dynamic response for fiber grating sensor may need for further investigations. The main objective of this thesis is to establish the experimental measurement system based on the grating based fiber sensors to obtain the dynamic transient response of structures subjected to dynamic impact loadings.
In this thesis, the tilted fiber Bragg grating (TFBG) and normal fiber Bragg grating (FBG) are proposed as new filter to increase the sensitivity of the fiber grating sensor measuring system. We also provide a new gluing method, it can be used to perform the measurement of out-of-plane motion . The fiber grating sensing-system is used as a displacement sensor and measurement sensitivity is in the order of submicrometer. The etched fiber grating sensor is developed to analyze the in-plane and out-plane coupling effect in transient wave propagation. All the transient responses are simutaneously measured by Laser Doppler vibrometer (LDV), and the results are in excellent agreement with that obtained by fiber grating sensing system.
Subjects
傾斜式光纖光柵
短週期光纖光柵
能量調變
雷射都普勒振動儀
穩態振動
暫態波傳
Tilted fiber Bragg grating
Fiber Bragg grating
LDV
Etched fiber grating sensor
Transient responses
Type
thesis
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