2024
DOI: 10.21203/rs.3.rs-4374176/v1
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Enhanced Vibration Measurement through Frequency Modulated Laser Diode Self-Mixing Interferometry

Jiung-Ran Liao,
Chien-Ming Chen,
Vincent K.S. Hsiao

Abstract: Self-mixing interference (SMI) has emerged as a powerful non-contact vibration sensing technique, leveraging the inherent coupling between laser emission and external optical feedback. However, conventional SMI systems often face limitations in signal resolution and measurement accuracy, particularly when probing low-amplitude vibrations or low-reflectivity targets. This study proposes a novel frequency modulation (FM) approach, FM-SMI, to enhance the capabilities of SMI setups. By intentionally modulating the… Show more

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