Progress in Interferometric Measurements of Biological Signals

Interferometric techniques have been demonstrated valuable in a number of different experiments involving the measurement of biological signals, because they provide unparalleled sensitivity, contactless operation and are applicable to a variety of biological signals involving kinematic measurands. In particular, self-mixing interferometry (SMI) is attracting interest because of the very simple experimental setup and low cost. We discuss recent progresses of SMI in the field of vibrometry, pressure waves and flow, and THz detection.