2023_programme: Modeling the effects of modulated radiation pressure using an acoustic lens

• Session: 15. Towards Automatic Target Recognition. Detection, Classification and Modelling
  Organiser(s): Johannes Groen, Yan Pailhas, Roy Edgar Hansen, Jessica Topple and Narada Warakagoda
• Lecture: Modeling the effects of modulated radiation pressure using an acoustic lens
  Paper ID: 1918
  Author(s): Abawi Ahmad Marston Phlip Kirsteins Ivars, Fortuner Auberry Smith Sterling, Daniel Timothy
  Presenter: Abawi Ahmad
  Abstract: Modulated radiation pressure (MRP) is a method of utilizing the acoustic radiation force by using a double-sided suppressed carrier modulated (DSB-SCM) signal. This produces a modulated signal that oscillates at twice the modulation frequency. This process facilitates target detection and classification by using a high carrier frequency to probe the target and shake it with the low modulation frequency, which can be designed to be commensurate with the vibrational modes of the target. A frequency sweep can estimate the target resonant frequencies, while a physical scan along its length can estimate its mode shapes. Recently, a series of experiments were conducted at Washington State University with a newly designed and fabricated acoustic lens with a one-meter focal length. These experiments demonstrated that the first few bending modes of scaled targets like a solid aluminum cylinder and an open-ended aluminum cylindrical shell could be excited by MRP at a standoff distance of one meter and target mode shapes were measured using a physical scan. In this presentation, we show modeling results that confirm experimental findings: 1) estimation of target resonant frequencies using a frequency sweep and 2) estimation of target mode shapes using a physical scan.
• Corresponding author: Dr Ahmad Abawi
  Affiliation: HLS Research
  Country: United States
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