My research focuses on direct and inverse problems involving wave motion. Example topics include inverse scattering, waves in periodic and random media, geodynamics, and nonlinear waves in soft solids. We tackle the scientific and engineering challenges using analytical, computational, and experimental tools. Target applications of our work include nondestructive evaluation (NDE) of materials and structures, seismic imaging, medical diagnosis, and wave manipulation by architected materials.

High-frequency inverse scattering

This study [61] deciphers the Topological Sensitivity (TS) as a tool for 3D anomaly reconstruction in the high-frequency regime. The video shows the TS map in a mid-section of an ellipsoidal anomaly w/increasing source aperture.

Research openings

Waveform tomography of a hard defect

In [36], we pursue 3D seismic waveform tomography using surface observations. The video shows the evolution of a trial anomaly during nonlinear minimization, whose color indicates the inclusion's modulus (G>Gb).

Research openings

My research focuses on direct and inverse problems involving wave motion. Example topics include inverse scattering, waves in periodic and random media, geodynamics, and nonlinear waves in soft solids. We tackle the scientific and engineering challenges using analytical, computational, and experimental tools. Target applications of our work include nondestructive evaluation (NDE) of materials and structures, seismic imaging, medical diagnosis, and wave manipulation by architected materials.

Waveform tomography of a soft defect

In [36], we pursue 3D seismic waveform tomography using surface observations. The video shows the evolution of a trial anomaly during nonlinear minimization, whose color indicates the inclusion's modulus (G<Gb).

Research openings

My research focuses on direct and inverse problems involving wave motion. Example topics include inverse scattering, waves in periodic and random media, geodynamics, and nonlinear waves in soft solids. We tackle the scientific and engineering challenges using analytical, computational, and experimental tools. Target applications of our work include nondestructive evaluation (NDE) of materials and structures, seismic imaging, medical diagnosis, and wave manipulation by architected materials.

Ultrasonic waves in an aluminum plate

Waves & Imaging Lab @UMN: 3D Scanning Laser Doppler Vibrometer (SLDV) capture of the plane-stress wavefield in an aluminum plate containing a hole and a slit @100kHz.

Research openings

My research focuses on direct and inverse problems involving wave motion. Example topics include inverse scattering, waves in periodic and random media, geodynamics, and nonlinear waves in soft solids. We tackle the scientific and engineering challenges using analytical, computational, and experimental tools. Target applications of our work include nondestructive evaluation (NDE) of materials and structures, seismic imaging, medical diagnosis, and wave manipulation by architected materials.

Seismic waves across a stationary fracture

Waves & Imaging Lab @UMN: 20kHz ultrasonic waves propagating across a stationary through-fracture in a granite slab: out-of-plane (uz) displacement wavefield captured by SLDV.

Research openings

My research focuses on direct and inverse problems involving wave motion. Example topics include inverse scattering, waves in periodic and random media, geodynamics, and nonlinear waves in soft solids. We tackle the scientific and engineering challenges using analytical, computational, and experimental tools. Target applications of our work include nondestructive evaluation (NDE) of materials and structures, seismic imaging, medical diagnosis, and wave manipulation by architected materials.

Seismic waves across an advancing fracture

Waves & Imaging Lab @UMN: 20kHz ultrasonic waves propagating across an advancing fracture in a granite slab subjected to 3-point bending: in-plane (uy) displacement waveforms captured by SLDV.

Research openings

My research focuses on direct and inverse problems involving wave motion. Example topics include inverse scattering, waves in periodic and random media, geodynamics, and nonlinear waves in soft solids. We tackle the scientific and engineering challenges using analytical, computational, and experimental tools. Target applications of our work include nondestructive evaluation (NDE) of materials and structures, seismic imaging, medical diagnosis, and wave manipulation by architected materials.