A displacement reconstruction algorithm used for optical feedback self mixing interferometry system under different feedback levels
2010
Displacement information of a moving target can be detected using an optical feedback self-mixing interferometry
(OFSMI) system. A sensing signal observed from the OFSMI system is called self-mixing signal (SMS). The paper
studies the waveform features of the SMSs and proposes an algorithm for reconstructing the displacement of a moving
target. The reconstruction accuracy of the algorithm mainly depends on the locating accuracy for those characteristic
points on a SMS. A set of rules for identifying those characteristic points are described in the paper. The proposed
algorithm is verified by simulation signals firstly, and then applied on extensive SMSs which are obtained from the
experimental set-up. The results show that the displacement of the external moving target can be reconstructed under
different feedback levels.
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