A miniature laser interferometer for noninvasive viscometry
Capillary waves, Interferometer, Laser, Viscosity
2003 Nanotechnology Conference and Trade Show - Nanotech 2003
A miniature laser interferometer consisting entirely of an optical fiber held in close proximity to a fluid surface is described. The total path difference in this interferometer is less than a millimeter. The interferometer may be used to measure, for example, the amplitude of submicron capillary waves on fluids with a resolution of about 10 nm. In one application the interferometer is used to measure, noninvasively, the amplitude decay of capillary waves as a function of the distance from the wave generator. The amplitude decay data yields the viscosity of the fluid with unprecedented precision. As a test case, the viscosity of pure water as a function of temperature, measured by this system, will be presented.
Department of Physics
Original Publication Date
Behroozi, F., "A miniature laser interferometer for noninvasive viscometry" (2003). Faculty Publications. 3207.