In this paper, an open ended coaxial resonator based
displacement sensor is presented. The developed device is
capable of determining the xy-plane displacement in a
contactless way. The sensor system is constructed from a
dielectric wedge, a coaxial resonator, as well as two ISM
band Radio modules. The resonance frequency and quality
factor of the cavity change when the dielectric target moves
with respect to the open end of the resonator. Measuring the
transmission of the resonator, a resonance curves can be
created which clearly define the position of the target. The
perturbation based operating principle of the sensor has been
tested using loads made of teflon and rogers. Addition to
high accuracy and range, the easy and cheap evaluation of the
results make the presented sensor system particularly
interesting for industrial applications.
