Dissertation
Dissertation > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Physical sensors > Light sensor

Study on Fiber Grating Array Sensor System and Demodulation Technology

Author DongBo
Tutor HeShiYa
School Beijing University of Technology
Course Optics
Keywords Sensor Fiber Bragg Grating Sensor Array The wave points / time division multiplexing Matching grating filter
CLC TP212.14
Type Master's thesis
Year 2005
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Fiber grating is the most rapid development in recent years , the most widely used fiber optic passive components . Due to its many unique advantages in the field of fiber-optic communication , fiber optic sensing has broad application prospects . Fiber grating sensors based on fiber grating technology has become a hot topic in the field of sensor research . The outstanding advantages of fiber grating as a sensor reusability using multiple fiber grating , can constitute a distributed sensor network , multi-point detection , which has important applications in intelligent and smart structures . The main contents of this paper are as follows : the theory of fiber grating system , the main contents include : fiber grating coupled mode theory ; the lightwave transmission characteristics of the fiber Bragg grating ; physical characteristics of the fiber Bragg grating sensing principle . And the status and application of optical fiber sensing technology development at home and abroad . At home and abroad have studied filter demodulation method simply summarized and analyzed , and matched grating filter demodulation technology into the system of theoretical analysis and experimental research , experimental filter demodulation technology wavelength resolution rate 2.33pm. The reported fiber grating multiplexed sensing system literature [ 21 ~ 24, 30 ~ 39,42,44 ] , first designed and implemented based on the tunable fiber lasers , fiber Bragg grating wavelength division and time division multiplexing array sensor system , the sensor system with economic practicality , high signal-to-noise ratio with great number of reusable sensor network for multi - point detection has great practical value . The specific content of the study are as follows : ( 1) design based on tunable fiber Bragg grating fiber laser , tunable wavelength range of 10 nm , and its works . (2) the use of the microcontroller and the optical intensity modulator is a continuous laser pulse light is modulated into a time division multiplexing require peak power compared to the widespread use of broadband light source , the light source is strong , high SNR after sensing network . (3) using the matching grating tuned fiber laser wavelength scanning addressable active demodulation scheme , and the success of a wavelength division and time division multiplexing sensing four fiber grating composed of a string of two grating strain resolution of 2.9 με / step.

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