The goals of the current project are: Development of a new contact less method, based on light interferometry which makes use of the Doppler shift of reflected light, which will allow us to measure PWV between two well defined locations close to one another. Designing and building a very compact two-channel laser-Doppler heterodyne interferometer which allows to measure blood PWV in realistic circumstances. Making a physics-based model of the fluid dynamics, and using this model to calculate stiffness of the artery. Explorative research for miniaturization and integration of the interferometer components, as onset for a fully integrated micro-vibrometer.