A simple and robust optical scheme for self-mixing low-coherence flowmeters

Stefano Cattini; Luigi Rovati

doi:10.1117/12.2035962

28 February 2014 A simple and robust optical scheme for self-mixing low-coherence flowmeters

Stefano Cattini, Luigi Rovati

Proceedings Volume 8951, Optical Diagnostics and Sensing XIV: Toward Point-of-Care Diagnostics; 895102 (2014) https://doi.org/10.1117/12.2035962
Event: SPIE BiOS, 2014, San Francisco, California, United States

Abstract

The developed measuring system is based on a low-coherence source and a self-mixing (or internal) detection. The proposed optical layout exploits the reflection from the internal wall of the duct as reference arm, thus reducing system complexity, cost, size and increasing its robustness to movements of the measurand. Moreover, the usage of a low-coherence source allows reducing the problems related to the poor definition of the volume under test (sensing region or measurement volume) typical of “coherent” self-mixing systems. Although preliminary analysis have been performed by simply investigating the frequencies relative to the maximum in the Doppler spectrum, the obtained results demonstrates that by increasing scatterers concentration of +300%, the system sensitivity increases of about only +20%.

Citation Download Citation

Stefano Cattini and Luigi Rovati "A simple and robust optical scheme for self-mixing low-coherence flowmeters", Proc. SPIE 8951, Optical Diagnostics and Sensing XIV: Toward Point-of-Care Diagnostics, 895102 (28 February 2014); https://doi.org/10.1117/12.2035962

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