The PGC Demodulation and Automatic Compensation of the Fiber Optic Interferometric Sensor Using FPGA Digital Signal Processing

• Main Author: 黃冠文
• Other Authors: 黃世巨
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/80468502277967870993

碩士 === 國立高雄師範大學 === 光電與通訊工程學系 === 100 === In this paper , we use the balanced receiver with a 3-port optical circulator for the phase generated carrier demodulation system , and use the appropriate length of the optical path difference to improve the distortion and the instability amplitude. Also we reduce the noise of light intensity caused by the laser modulation. It accomplishes the only passive components in all-fiber structure by using a laser current modulation to modulate the high frequency carrier. And it conforms the requirements of long distance or outdoor detection applications. In the platform of Xilinx ® support DSP, we design the interfereometric sensors of digitized PGC demodulation. And we use the field programmable logic gate components designing the architecture of digital PGC demodulation .Then it replaces the analog signal of PGC demodulation. The hardware description language of Verilog is converted by System Generator, and it uses to simulate and design in this eperimental system. We analyze and verify the digital components in the Xilinx ISE development software, and debug programs by the chipscope . The digitization PGC demodulation system is completed with ADuC841micro control system, and the AD7625 analog to digital converter. We use the digital components of Xilinx ® support DSP , and it completes the demodulation system of automatic compensation function.