Current studies of micro and nanoflows suffer from limited spatial and velocity resolution due to the diffraction limit for optical techniques and probe size for other anemometry sensors. We describe a force transduction technique that may aid in the direct observation of fluid flows with sub-micron resolution. Of particular interest are flows in the Knudsen regime, where no-slip boundary conditions no longer apply. We investigate modification of Poiseuille flow in small channels in a variety of porous structures and discuss our results.