Title :
All-digital Real Time Demodulation System of Fiber Laser Hydrophone Using PGC Method
Author :
Yu, Li ; Junbin, Huang ; Hongcan, Gu ; Rizhong, Li ; Bo, Tan ; Liang, Chen
Author_Institution :
Dept. of Weapon Eng., Naval Univ. of Eng., Wuhan, China
Abstract :
After analyzing the sensing theory of a DFB fiber laser, the demodulation principle of fiber Bragg grating hydrophone using a phase generated carrier based on Michel son interferometer was introduced. A digital demodulation system based on DSP was designed then, and a feasible resolution was provided to the error-induced factor caused by the frequency error between that of sinusoidal modulation and of mixing signals. The experiment shows, the waveform of demodulated acoustic signal with low frequency was nice.
Keywords :
Bragg gratings; Michelson interferometers; acoustic signal detection; demodulation; digital signal processing chips; distributed feedback lasers; fibre lasers; fibre optic sensors; hydrophones; optical signal detection; underwater sound; DFB fiber laser; Michelson interferometer; PGC method; all digital real time demodulation system; demodulated acoustic signal waveform; digital demodulation system; fiber Bragg grating hydrophone; fiber laser hydrophone; frequency error induced factor; phase generated carrier; sinusoidal modulation; Acoustics; Demodulation; Fiber lasers; Frequency modulation; Optical fiber sensors; Optical fiber theory; Sonar equipment; Acoustic pressure sensing; DSP; PGC; fiber laser hydrophone;
Conference_Titel :
Measuring Technology and Mechatronics Automation (ICMTMA), 2011 Third International Conference on
Conference_Location :
Shangshai
Print_ISBN :
978-1-4244-9010-3
DOI :
10.1109/ICMTMA.2011.91
