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Sökning: LAR1:lu > Gustafsson Mats > Kungliga Tekniska Högskolan > (2000-2004)

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1.
2.
  • Gustafsson, Mats, et al. (författare)
  • Time-reversal retrofocusing and inverse scattering
  • 2002
  • Ingår i: Proceedings General Assembly of the International Union of Radio Science.
  • Konferensbidrag (refereegranskat)abstract
    • Time-reversal retrofocusing is used together with a gradient based inverse scattering algorithm to identify the material distribution in a cavity. The time-reversal retrofocusing algorithm designs input fields such that the field energy is concentrated to the region where the material is unknown at a specific time. After this time the field energy in the cavity decays rapidly.  
  •  
3.
  • Jonsson, B. Lars G., et al. (författare)
  • Retrofocusing of Acoustic Wave Fields by Iterated Time Reversal
  • 2004
  • Ingår i: SIAM J. Appl. Math.. - Society for Industrial and Applied Mathematics. - 0036-1399. ; 64:6, s. 1954-1986
  • Tidskriftsartikel (refereegranskat)abstract
    • In the present paper an iterative time-reversal algorithm that retrofocuses an acoustic wave field to its controllable part is established. For a fixed temporal support, i.e., transducer excitation time, the algorithm generates an optimal retrofocusing in the least-squares sense. Thus the iterative time-reversal algorithm reduces the temporal support of the excitation from the requirement of negligible remaining energy to the requirement of controllability. The time-reversal retrofocusing is analyzed from a boundary-control perspective where time reversal is used to steer the acoustic wave field towards a desired state. The wave field is controlled by transducers located at subsets of the boundary, i.e., the controllable part of the boundary. The time-reversal cavity and time-reversal mirror cases are analyzed. In the cavity case, the transducers generate a locally plane wave in the fundamental mode through a set of ducts. Numerical examples are given to illustrate the convergence of the iterative time-reversal algorithm. In the mirror case, a homogeneous half space is considered. For this case the analytic expression for the retrofocused wave field is given for finite temporal support. It is shown that the mirror case does not have the same degree of steering as the cavity case. It is also shown that the pressure can be perfectly retrofocused for infinite temporal support. Two examples are given that indicate that the influence of the evanescent part of the wave field is small.
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  • Resultat 1-3 av 3
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fritt online (2)
Typ av publikation
tidskriftsartikel (2)
konferensbidrag (1)
Typ av innehåll
refereegranskat (3)
Författare/redaktör
Jonsson, B. Lars G., (2)
De Hoop, Maarten V (1)
Jonsson, Lars (1)
He, Sailing, (1)
Weston, Vaughan H (1)
Lärosäte
Lunds universitet (3)
Språk
Engelska (3)

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