Digital phase demodulation technique based on low coherence fiber optic interferometry and phase measurement interferometry

Miao Yu

doi:10.1117/12.599976

16 May 2005 Digital phase demodulation technique based on low coherence fiber optic interferometry and phase measurement interferometry

Miao Yu

Author Affiliations +

Proceedings Volume 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems; (2005) https://doi.org/10.1117/12.599976
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

Phase modulated fiber-optic sensors based on Fabry-Perot interferometers have been widely used in many applications. In this paper, a novel digital phase-stepping demodulation technique is developed, which is based on combining the principle of low coherence fiber-optic interferometry (LCFOI) and phase-measurement interferometry (PMI). An integrated optical circuit (IOC) phase modulator that enables a high frequency modulation is used to acquire multi-step phase shifts that are applicable to each sensing interferometer in a spatial division multiplexing system. The phase retrieval algorithm along with phase unwrapping technique is detailed and phase error associated with this technique is discussed. A multichannel acoustic measurement system was demonstrated using this technique. Experimental results show that this technique is especially useful for Fabry-Perot sensors with sensor cavity length in micrometer range and sensor bandwidth requirements in kHz to MHz range.

Citation Download Citation

Miao Yu "Digital phase demodulation technique based on low coherence fiber optic interferometry and phase measurement interferometry", Proc. SPIE 5758, Smart Structures and Materials 2005: Smart Sensor Technology and Measurement Systems, (16 May 2005); https://doi.org/10.1117/12.599976

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