6 August 2001 Development of new synthetic heterodyne in sinusoidal phase modulation for optical fiber sensors
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Abstract
In this study a new algorithm for modulating a PZT stack using a sine-wave signal instead of a saw-tooth signal was developed in order to resolve the flyback problem in a PZT driver. An improved synthetic heterodyne demodulator circuit was designed and arranged to interrogate the output signal from an interferometric sensor with a sine-wave modulation (phase-generated carrier). A depth of modulation or a gain amplifier to the circuit design was adjusted such that the standard heterodyne signal could be formed. The result is a conventional PM modulated carrier that can be demodulated using standard techniques, followed by a lock-in amplifier or a phase meter, to recover the phase shift in the sensing information.
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Yu-Lung Lo, Yu-Lung Lo, Chin Ho Chuang, Chin Ho Chuang, } "Development of new synthetic heterodyne in sinusoidal phase modulation for optical fiber sensors", Proc. SPIE 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (6 August 2001); doi: 10.1117/12.435530; https://doi.org/10.1117/12.435530
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