Research

Research staff and Postdoc, Lawrence Livermore National Laboratory: July, 2018-current

Nondestructive Evaluation group, Engineering Division:

1. Develop a compressed sensing algorithm using sparsely sampled measurements for laser based ultrasound NDE of additively manufactured materials,

2. Develop an electrical resistivity tomography system for NDE of additively manufactured truss structures,

3. Develop millimeter wave and microwave based diagnostic systems for in-situ characterization of metal droplets during the jetting-based additive manufacturing process,

4. Develop a time reversal microwave imaging algorithm for imaging extended defects in composite materials,

5. Develop three dimensional microwave imaging algorithms for imaging detonation wavefronts during explosions.

Global Security Division:

1. Determine pulse characterization and distortion from high power, compact optoelectronic devices using Pronys method,

2. Investigate techniques to compensate pulse distortion for high power optoelectronic devices,

3. Support the development of RF components such as phased array antenna and capacitor banks for high power applications.

4. Investigate novel antenna designs combining machine learning and topology optimization methods for advancement of additive manufacturing technologies.

Computational Geosciences group, Physical and Life Sciences Division -

1. Develop electromagnetic imaging methods for enhanced characterization of the Earth's sub-surface for:

• sensing of CO2 leaks during the carbon sequestration process using cross-bore sensing,

• determining the structural health and integrity of a CO2 injected well,

• detection of sub-surface ice in the lunar sub-surface using ground penetrating radar,

• monitoring oil reservoirs during the steam injection process using downhole radar sensing.

2. Develop EM sensors and signal processing algorithms for detecting CO2 leaks and structural integrity of wellbores.

Graduate Research Assistant,

Nondestructive Evaluation Laboratory, Michigan State University. 2013-2018

Thesis Title: "A hybrid electromagnetic imaging system for NDE and biomedical applications".

Tasks involve:

1. Development of a hybrid microwave imaging system combining benefits of far field and near field imaging for high resolution rapid NDE of composites.

• Design a time reversal (TR) based imaging algorithm coupled to a pulsed time domain microwave system for rapid inspection of large areas.

• Design of a metamaterial lens for perfect focusing and sub-wavelength imaging applications.

• Design of metamaterial inspired flexible substrate sensors for compact, sub-millimeter detection of defects.

• Development of an accelerated sub-wavelength near-field microwave microscopic imaging system.

2. Development of a microwave imaging system for breast cancer diagnosis.

• Design of a compact microwave TR mirror (with UWB antennas) for imaging applications.

• Develop a signal processing algorithm to detect tumors from total field contribution using TR imaging.

• Numerical studies conducted with MRI derived breast phantoms and experiments conducted with simplistic, liquid breast phantoms for imaging and hyperthermia treatment of breast cancers.

3. Differential geometry based co-ordinate transformation for eddy current imaging of steam generator tubes to convert complex shaped tubes to straight sections and increasing lift-off distances, thus avoiding complex trajectory of the inspection probe and a non-uniform mesh.

4. Development of finite element analysis modules in a GUI based computational model (SGTSIM) for evaluating structural integrity of aircrafts and steam generator tubes.

Undergraduate Researcher,

Microwave and Antenna Research Laboratory, National Institute of Technology, Durgapur. 2011-2013

• FDTD based EM numerical modelling of metamaterials employing novel boundaries.

• Design of digital filters using evolutionary and heuristic algorithms.