Sensing behavior of a quartz-crystal tuning-fork tactile sensor was tested
using several types of materials (metals and slide glass) and several sheet
s of sandpaper of different roughnesses fixed on copper or aluminum plates
with acrylic resin paste. Sensing mechanisms on the longitudinal plane wave
transmission model are discussed. For materials with roughnesses in the ra
nge of sandpaper roughnesses, this sensor functions as a simple roughnesses
sensor in a stationary state.