Identification of resonant modes of a layered elastic cylinder

Since the target is fixed in a practical Doppler component measurement, the acoustic frequency is the only controllable parameter. By detecting the peaks in the scattered acoustic field (or Doppler component of the electromagnetic field) while sweeping the acoustic frequency the resonant frequencies can be elucidated. Then by identifying the corresponding bistatic Doppler pattern at the resonant frequencies the mode order can be determined. These data demonstrate mode sensitivity to various parameters and provide a starting point for an inverse model for this geometry. Further research will use information similar to that contained in the paper along with electromagnetic simulation of the bistatic Doppler component to determine relationships between various parameters of the object structure and material and the scattered field Doppler component. These results will be presented at the conference.