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Design of Digital Demodulation System for Fiber Bragg Grating Sensor

Author: DingYue
Tutor: JinJie
School: Tianjin University
Course: Electromagnetic Field and Microwave Technology
Keywords: Optical fiber sensing FBG Tunable F-P Filter Demodulation
CLC: TP212.14
Type: Master's thesis
Year: 2010
Downloads: 51
Quote: 0
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Abstract


Optical fiber sensing its security , anti-electromagnetic interference , corrosion resistance, small size , high temperature , light weight, flexible and convenient in the sensing field has been widely used, and can form a neural network , intelligent sensor network . Modern fiber and integrated optical components production technology improved so that people can in the fiber to create a wide variety of cycles and aperiodic grating fiber Bragg grating ( Fiber Bragg Grating FBG ) has been widely used in optical fiber communication systems , such as fiber lasers , distributed feedback laser , the optical fiber in the WDM system filter and a dispersion compensator . Due to the unique sensing properties of FBG , FBG also widely used in optical fiber sensing system . Design FBG sensing demodulation system based on tunable FP filter , filter drive circuit individually designed to achieve the control of the tunable FP filter with NI6010 data acquisition card signal acquisition , and the use of LabVIEW programming analysis of the signal and display, verify the feasibility of the program . In order to improve the sampling rate and the independence of the system , the paper introduces the use of the the AD7266 and DAC811 chip . Independent design data acquisition module , a set of single-ended optical signal , a set of differential optical signal , 1 single-ended signal and 1 the way ordinary pseudo-differential signal input, single-channel sampling rates up to 1MSPS, accuracy of 12.5 ppm , and combined with embedded ARM development board to achieve control of data acquisition module , as well as analysis of the signal , the display features such as the completion of the digital FBG sensing demodulation system designed .

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