A zero-crossing detection method applied to Doppler OCT.

We present a numerical method based on the detection of the zero-crossing points in an OCT signal for the measurement of the Doppler frequency in a laminar flow. This method is compared to other processing approaches currently used in Doppler OCT. The results show that in the case of laminar flow the zero-crossing method gives the most precise results, especially in the higher velocity regime. (C) 2008 Optical Society of America.