16 May 2005 Digital phase demodulation technique based on low coherence fiber optic interferometry and phase measurement interferometry
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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.
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Miao Yu, 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); doi: 10.1117/12.599976; https://doi.org/10.1117/12.599976
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