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Design and Research on Push-pull Double Fiber Bragg Grating Based Accelerometer

Author: XuYuChao
Tutor: JiangQi
School: Shandong University
Course: Control Science and Engineering
Keywords: Dual fiber grating Acceleration IM-DD light intensity demodulation LabView Finite Element
CLC: TP212.9
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Starting from the 1990s, the efforts of many domestic and foreign research institutions and scholars in the field of fiber grating sensing technology which opens up a new era of fiber grating sensor. Which in many fiber grating sensors, relatively rapid development is based on fiber grating vibration acceleration sensor. Into the 21st century, scientific research institutions in the various countries of the world launched a novel sensing system of seismic monitoring of the marine seabed seismic waves and the crust plate, based on fiber grating acceleration sensor because of its simple structure, low power consumption and favored. The entire monitoring sensor system, the work or making a simple mechanical structure and low-complexity demodulation system based on fiber grating acceleration sensor. Based on fiber grating sensing technology and the realization of the principles and techniques of acceleration measurement system analysis, the push-pull of a new dual-fiber grating the acceleration sensor design and demodulation scheme. The main content of the paper are: First, starting from the fiber grating sensing theory, analysis of the fiber Bragg grating strain sensing characteristics, the design of a new type of fiber Bragg grating acceleration sensor, the design uses two optical fiber grating as the sensing components, and this new type of FBG acceleration sensor mathematical model, its mechanical properties as well as the characteristic equation and theoretical derivation with finite element analysis, confirmed by the design of a new type of FBG acceleration sensor is able to achieve acceleration measurement. Details of the new FBG acceleration sensor mechanical structure design and processing and assembly. Second, systems analysis contrast to the more mature light signal demodulation technology, special dual fiber grating structure and spectral characteristics, proposed its adapting light intensity direct modulation - demodulation (IM-DD) system. The theory dual fiber grating the reflected light intensity relative strain therewith relationship, simulation to the theoretical curve. Finally proved that the light intensity directly modulation - demodulation techniques can be used as the demodulation method of the new acceleration sensor. Description of the entire sensing light path and the signal demodulation unit. Finally, the experimental design, the use of laboratory resources experimental platform. Comparison test, the design of the sensor electromagnetic acceleration sensor steady state sinusoidal excitation to verify the stability and reliability of the system, lack of comprehensive comparative analysis of two acceleration sensors of experimental data to test the design of the sensor exists; same time experimental data using the LabView PC software storage to facilitate subsequent data analysis work.

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Sensor applications
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