Rigas, EvangelosHallam, Jonathan M.Charrett, Thomas O. H.Ford, H. D.Tatam, Ralph P.2019-11-152019-11-152019-08-19Rigas E, Hallam JM, Charrett TOH, et al., (2019) Metre-per-second microfluidic flow velocimetry with dual beam optical coherence tomography. Optics Express, Volume 27, Issue 17, 2019, pp. 23849-238631094-4087https://doi.org/10.1364/OE.27.023849https://dspace.lib.cranfield.ac.uk/handle/1826/14741A novel dual beam Optical Coherence Tomography (OCT) instrument has been developed for high velocity flow measurement, principally in microfluidics applications. The scanned dual beam approach creates a pair of image-frames separated by a small spatiotemporal offset. Metre-per-second flow measurement is achieved by rapid re-imaging by the second beam allowing for particle tracking between each image-frame of the pair. Flow at 1.06 m/s using a single optical access port has been measured, more than two orders of magnitude larger than previously reported OCT systems, at centimetre depth and with millimetre scale depth of field within a microfluidic chip, whilst simultaneously imaging the microfluidic channel structure.enAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Article24321501