title: Ultrasonic measurements of the reflection coefficient at a water/polyurethane foam interface.
abstract: Measured ultrasonic reflection coefficients as a function of normal incidence angle are reported for several samples of polyurethane foam submerged in a water bath. Three reflection coefficient models are employed as needed in this analysis to approximate the measured data: (1) an infinite plane wave impinging on an elastic halfspace, (2) an infinite plane wave impinging on a single fluid layer overlying a fluid halfspace, and (3) a finite acoustic beam impinging on an elastic halfspace. The compressional wave speed in each sample is calculated by minimizing the sum of squared error (SSE) between the measured and modeled data.
authors: Applied Research Laboratories, The University of Texas at Austin, PO Box 8029, Austin, Texas 78713-8029, USA. sagers@arlut.utexas.edu
authors: Jason D
authors: JD
authors: Sagers
authors: Michael R
authors: MR
authors: Haberman
authors: Preston S
authors: PS
authors: Wilson
mesh_terms: D004867:Equipment Design; D008962:Models, Theoretical; D009038:Motion; D011140:Polyurethanes; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013499:Surface Properties; D014159:Transducers; D014465:Ultrasonics / Q000295:instrumentation; D014867:Water
chemical_list: D011140:Polyurethanes; D014867:Water; C028279:polyurethane foam