Absolute distance measurements based on TD SM-SLD: performances characterization and calibration

Ettore Masetti; Tommaso Fedullo; Stefano Cattini; Luigi Rovati

doi:10.1117/12.2607586

5 March 2022 Absolute distance measurements based on TD SM-SLD: performances characterization and calibration

Ettore Masetti, Tommaso Fedullo, Stefano Cattini, Luigi Rovati

Proceedings Volume 12008, Photonic Instrumentation Engineering IX; 120080H (2022) https://doi.org/10.1117/12.2607586
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

Time-Domain Low-Coherence Interferometry (TD-LCI) is a well-known optical method to perform absolute distance measurements. As an alternative to conventional TD-LCI, the Self-Mixing Super Luminescent Diode (SM-SLD) technique represents a unique approach for simplicity and compactness. The presence of optical feedback in the source cavity allows obtaining huge interference fringes, even with diffusive targets and without using high-sensitivity and low-noise detectors. In this work, we present the performances of a custom-made SM-SLD interferometer for absolute distance measurements compared with a reference incremental interferometer. Thanks to the simplified acquisition method and the resulting improved signal-to-noise ratio, the system exhibits excellent metrological performances.

Conference Presentation

Citation Download Citation

Ettore Masetti, Tommaso Fedullo, Stefano Cattini, and Luigi Rovati "Absolute distance measurements based on TD SM-SLD: performances characterization and calibration", Proc. SPIE 12008, Photonic Instrumentation Engineering IX, 120080H (5 March 2022); https://doi.org/10.1117/12.2607586

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