Development of new synthetic heterodyne in sinusoidal phase modulation for optical fiber sensors

Yu-Lung Lo; Chin Ho Chuang

doi:10.1117/12.435530

6 August 2001 Development of new synthetic heterodyne in sinusoidal phase modulation for optical fiber sensors

Yu-Lung Lo, Chin Ho Chuang

Proceedings Volume 4328, Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (2001) https://doi.org/10.1117/12.435530
Event: SPIE's 8th Annual International Symposium on Smart Structures and Materials, 2001, Newport Beach, CA, United States

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.

Citation Download Citation

Yu-Lung Lo and 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); https://doi.org/10.1117/12.435530

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