Research And Design On The Digital Scheme Of TDM Interferometric Fiber-optic Hydrophones

As a kind of new system with strong anti-interfenrence ability, high sensitivity, brand dynamic range, fiber-optic hydrophone plays a more and more important role in detecting submarines, and it is one of the important investigative directions for modern national defense constructions.The dissertation discusses the elimination polarization fading technique and phase-generated-carrier homodyne detection technique of interferometric fiber-optic hydrophone in details; The key technology of digital demodulation is analyzed; A digital demodulation scheme of TDM fiber-optic hydrophone array is put forward based on DSP and CPLD; Then two sets of demodulation scheme of wide band interferometric signal are studied; At last a TDM and WDM fiber-optic hydrophone array based on TDM digital PGC demodulation scheme is designed.We have debugged the hardware circuit and finished the demodulation function in the subject. Aiming at practical application in fiber-optic hydrophone TDM demodulation system in the future, The paper puts forward the improved suggestion on the hardware design and software programme.