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Proceedings Paper

Development of new synthetic heterodyne in sinusoidal phase modulation for optical fiber sensors
Author(s): Yu-Lung Lo; Chin Ho Chuang
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Paper 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.

Paper Details

Date Published: 6 August 2001
PDF: 8 pages
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
Show Author Affiliations
Yu-Lung Lo, National Cheng Kung Univ. (Taiwan)
Chin Ho Chuang, National Cheng Kung Univ. (Taiwan)


Published in SPIE Proceedings Vol. 4328:
Smart Structures and Materials 2001: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Eric Udd; Daniele Inaudi, Editor(s)

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