Location:
AGB Seminar Room, 3rd floor
Date:
Dr. Weiwei Cai
University of Cambridge
Non-linear absorption tomography using WMS measurements
Abstract: Classical tomography (CT) is a mathematical concept that has been widely adopted and combined with various line-of-sight-integrated measurement techniques, resulting in numerous imaging methods for the resolution of spatial non-uniformity in scalar fields. This talk will introduce a new mathematical concept, which is the so-called nonlinear tomography (NT). Compared with CT, the sinogram of NT can assume more dimensions (e.g. the spectral dimension), which means more information can be accommodated in the reconstruction process to alleviate deficiencies in spatial sampling. Under the framework of NT, two new multi-spectral tomographic techniques based on both direct absorption spectroscopy and calibration-free wavelength modulation spectroscopy have been demonstrated for the imaging of chemical species for combustion diagnostics with only two orthogonal projections. The practice of NT essentially extends the definition of tomography. The new concept is also expected to be applicable to more tomographic areas such the electrical capacity/resistance tomography for the development of new variants for the imaging of gas properties.
Bio: Dr. Weiwei Cai is an EU Marie Curie Fellow at the Department of Chemical Engineering, University of Cambridge. He received his Ph.D. from Clemson University in 2010 and a B.S. from Zhejiang University in 2007. He was elected as a By-Fellow in the Churchill College, Cambridge in 2013 and was one of the recipients of the Masao Horiba Award in 2014. His research area includes Laser Spectroscopy and Combustion Diagnostics.
