Quantification of a three-dimensional velocity vector using spectral-domain Doppler optical coherence tomography.
- Author(s): Ahn, Yeh-Chan
- Jung, Woonggyu
- Chen, Zhongping
- et al.
Published Web Locationhttps://doi.org/10.1364/ol.32.001587
Multiangle, fiber-based, spectral-domain Doppler optical coherence tomography with a phase-resolved algorithm is presented to measure three components of an arbitrary velocity vector. A beam divider that divides a probe beam to have five independent viewpoints and path length delays was designed. The divider was inserted into the sampling arm of a Doppler optical coherence tomography system between the collimator and the first galvo mirror of a two-axis galvo scanner. The divider produced five independent D k's (the average difference between the wave vectors of incoming and outgoing beams) after passing through the focusing lens while keeping two-axis scanning capability. After calibration, an unknown velocity vector field inside a microtube was quantified by solving a three-dimensional minimization problem.