報告題目:Far field model of acoustic time reversal method in a layered medium
報 告 人:賴俊 研究員 浙江大學
報告時間:2024年4月26日 14:30–15:30
報告地點:數學樓三樓 研讨室5
校内聯系人:董和平 dhp@jlu.edu.cn
報告摘要:
This talk is concerned with the so-called DORT method that uses the eigenfunctions of time-reversal operator to determine the locations of small impenetrable scatterers buried in the lower half-space of an unbounded two-layered medium. We give a rigorous mathematical justification for the DORT method under sound-soft and sound-hard boundary conditions in a two-layered medium. Based on the limited-aperture time-harmonic far field model and an asymptotic analysis for small and distant particles, we show that each sound-soft and sound-hard buried particle gives rise to one and three significant eigenvalues, respectively. Utilizing the imaging result as an initial guess, a Bayesian inversion scheme is proposed to reconstruct the shape of multiple buried extended scatterers more accurately, whose efficiency is illustrated by numerical experiments.
報告人簡介:
賴俊,美國密歇根州立大學應用數學博士畢業,曾任紐約大學柯朗數學研究所博士後及講師,目前任浙江大學數學科學學院研究員,長聘副教授,主要研究聲波,電磁波及彈性波方程的散射與反散射問題,在數學知名雜志ACHA,SISC,Math Comp,Inverse Problems等發表文章多篇,主持國家面上項目,并參與基金委重大研究計劃,基金委創新群體等研究,2016年入選中組部海外高層次青年人才計劃,2019年獲十一屆全國反問題年會“優秀青年學術獎”,2022年獲浙江大學-小米青年學者稱号。