An inverse space-dependent source problem for hyperbolic equations and the Lipschitz-like convergence of the quasi-reversibility method. (4th February 2019)

• Record Type: Journal Article
• Authors: Nguyen, Loc Hoang
• Is Part Of: Inverse problems. Volume 35:Number 3(2019)
• Publication Date: 2019-02-04
• Subjects: inverse source problem -- quasi-reversibility method -- regularized solution -- Lipschitz stability -- Carleman estimates -- Volterra integral; Inverse problems (Differential equations) -- Periodicals; 515.357
• DOI: 10.1088/1361-6420/aafe8f
• Languages: English
• ISSNs: 0266-5611

Abstract

Abstract: We propose in this paper a numerical method to solve a linear inverse source problem for general hyperbolic equations. This is the problem of reconstructing sources from the lateral Cauchy data of the wave field on the boundary of a domain. In order to achieve the goal, we derive an equation involving a Volterra integral, whose solution directly provides the desired solution of the inverse source problem. Due to the presence of such a Volterra integral, this equation is not in a standard form of partial differential equations. We employ the quasi-reversibility method to find its regularized solution. Using Carleman estimates, we show that the obtained regularized solution converges to the true solution with the Lipschitz-like convergence rate as the measurement noise tends to 0. This is one of the novelties of this paper since currently, convergence results for the quasi-reversibility method are only known for purely differential equations. Numerical tests demonstrate a good reconstruction accuracy.