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The Study of Polarization Controlling and Compensation of Interferometric Arms in Fiber Optical Sensor System

Author: QiuXiaoXiang
Tutor: WuJian
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: Fiber Optic Sensors Polarization state control Interferometer arm compensation PC1000C
CLC: TP212.14
Type: Master's thesis
Year: 2009
Downloads: 125
Quote: 2
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Abstract


In recent years, with the sensor toward sensitive and delicate , adaptable , intelligent direction , a new family of fiber optic sensors sensor , due to its immunity to electromagnetic interference , safe and reliable , high sensitivity , may constitute sensing networks, and other advantages of more attention . Optical fiber sensing , Youyi interferometric fiber optic sensors highest sensitivity , the most widely used . However, the interference light polarization state changes caused by the interference signal fading is one of the fiber optic interferometer to practical problems to be solved . The main content of the paper is to design a based the Optellios of polarization controller ( The polarization controller , PC ) PC1000C 's polarization state control system through the feedback control of the input polarization states of light to solve the polarization state of the light wave instability . The interferometer output interference signal is sampled , and then enter the PIC microcontroller algorithm processing , followed by the output control signal to the polarization controller to adjust the polarization state of light in the fiber . Such that the polarization state of the input light by this method can be real-time dynamic tracking interferometer eigen vector changes , so that the angle between the two as far as possible to maintain in the range of zero , it is possible to make the system preferably stably In the preferred input polarization state nearby. The paper also designed the auxiliary systems of the optical fiber sensor interferometer arm length difference based on RTXM191 optical transceiver module measuring compensation system . From the physical properties of the two interferometer arms length as consistent as possible , to avoid greater length that much difference coherent noise . Firstly, the principle of interferometric fiber-optic sensors and input polarization state feedback control principle was introduced , and then described in detail based on the the polarization state PC1000C control system hardware and software design , and integrated development environment ( MPLAB ) with C language development program . Final details of the interferometer arm length difference of RTXM191 measurement compensation system - based hardware and software design and the integrated development environment using VHDL language programming and simulation . All schematics and printed circuit board ( printed circuit board , PCB ) design in EDA design environment .

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