I am a graduate student at Princeton and my research area experimental turbulence at extreme Reynolds numbers.
Part of my research involves developing a Nano-Scale Thermal Anemometry Probe (NSTAP) for high resulution velocity measurements. The sensing elements of NSTAPs are miniature freestanding platinum filaments, with dimensions of 100 nm x 2 um x 60 um or 100 nm x 2 um x 30 um. Therefore they can resolve velocities currently down to 30um with a time response well above 150kHz, and even further reduction in size is planned in the future. A Scanning Electron Microscope image of a recent design of NSTAP is shown in the figure below.
NSTAPs have been shown to work well in many different flows (grid turbulence, pipe flow and boundary layer flow, see the publications) and can be used to resolve very high Reynolds number flows both spatially and temporally. Several collaborations for using NSTAPs have been established all over the world - Max Plank Institute of Dynamics and Self-Organization, Melbourne University, University of Toronto, University of Mississippi, University of Kentucky.
At princeton, we have used NSTAPs to study pipe and boundary layer flow at very high Reynolds numbers. Pipe flow data aquired in Princeton/ONR Superpipe has been made available for download under Data. Publishing boundary layer results from High Reynolds Number Test Facility (HRTF) is in progress.