We have recently presented some of our work in the area of flow measurement at the 17th International symposium on application of laser techniques to fluid mechanics in Lisbon. (http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2014/index.asp) .
In the paper “Frequency-division multiplexing (FDM) for interferometric referencing and multi- component measurements in Planar Doppler Velocimetry (PDV)” (http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2014/finalworks2014/papers/01.2_2_78paper.pdf) we explore the applications of high speed industrial cameras for full-field interferometry and the multiplexing of velocity channels via frequency division multiplexing. A high speed CMOS camera is used to acquire image banks of multiple amplitude modulated signals acquired simultaneously which can then be separated in post-processing. This was applied to an interferometric Doppler Global velocimetry (DGV) allowing the measurement of flow velocity over a plane defined by a laser formed into a light sheet. The application of this technique enables the much easier implementation of multiple-component interferometric DGV systems and overcomes practical issues with interferometric drift and stability.
Update: Full Journal paper – this work has now been published in a more complete form, as a peer-reviewed journal article in Applied Optics:
Frequency-division multiplexing for Interferometric Planar Doppler Velocimetry
T O H Charrett, I A Bledowski, S W. James and R P Tatam
Applied Optics (2014) Applied Optics, Vol. 53, Issue 20, pp. 4363-4374 (2014) (http://dx.doi.org/10.1364/AO.53.004363)
Or via CERES https://dspace.lib.cranfield.ac.uk/ (Cranfield University institutional repository).