title: Enhancing the focal-resolution of aeroacoustic time-reversal using a point sponge-layer damping technique.
abstract: This letter presents the Point-Time-Reversal-Sponge-Layer (PTRSL) technique to enhance the focal-resolution of aeroacoustic Time-Reversal (TR). A PTRSL is implemented on a square domain centered at the predicted source location and is based on damping the radial components of the incoming and outgoing fluxes propagating toward and away from the source, respectively. A PTRSL is shown to overcome the conventional half-wavelength diffraction-limit; its implementation significantly reduces the focal spot size to one-fifth of a wavelength for a monopole source. Furthermore, PTRSL reduces the focal spots of a dipole source to three-tenths of a wavelength, as compared to three-fifths without its implementation.
authors.affiliation: School of Mechanical Engineering, The University of Adelaide, Adelaide, South Australia 5005, Australia akhilesh.mimani@adelaide.edu.au, con.doolan@adelaide.edu.au, paul.medwell@adelaide.edu.au.
authors.forename: A
authors.initials: A
authors.lastname: Mimani
authors.affiliation: School of Mechanical Engineering, The University of Adelaide, Adelaide, South Australia 5005, Australia akhilesh.mimani@adelaide.edu.au, con.doolan@adelaide.edu.au, paul.medwell@adelaide.edu.au.
authors.forename: C J
authors.initials: CJ
authors.lastname: Doolan
authors.affiliation: School of Mechanical Engineering, The University of Adelaide, Adelaide, South Australia 5005, Australia akhilesh.mimani@adelaide.edu.au, con.doolan@adelaide.edu.au, paul.medwell@adelaide.edu.au.
authors.forename: P R
authors.initials: PR
authors.lastname: Medwell