Browsing by Author "Gupta, Maya"

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    Recent advances in Imaging and Spectroscopy with T-rays
    (1998-12-01) Mittleman, Daniel M.; Neelamani, Ramesh; Gupta, Maya; Baraniuk, Richard G.; Nuss, Martin C.; Digital Signal Processing (http://dsp.rice.edu/)
    Recent work in terahertz "T-Ray" imaging is reported. With the ongoing development of commercially viable THz-TDS imaging system, opitmail signal processing strategies for the THz waveforms must be developed. Algorithms based on wavelet decomposition of the time and frequency-localized signals offer a number of advantages. Examples of denoising, deconvolution, and other waveform anaylsis tools are described.
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    Recent Advances in Terahertz Imaging
    (1999-06-01) Koch, Martin; Rudd, J. Van; Neelamani, Ramesh; Gupta, Maya; Baraniuk, Richard G.; Mittleman, Daniel M.; Center for Multimedia Communications (http://cmc.rice.edu/); Digital Signal Processing (http://dsp.rice.edu/)
    We review recent progress in the field of terahertz "T-ray" imaging. This relatively new imaging technique, based on terahertz time-domain spectroscopy, has the potential to be the first portable far-infared imagin spectrometer. We give several examples whcih illustrate the possible applications of this technology, using both the amplitude and phase information contained in the THz waveforms. We desribe the latest results in tomographic imaging, in which waveforms reflected from an object can be used to form a three-dimensional representation. Advanced signal processing tools are exploted for the purpose of extracting tomographic results, including spectroscopic information about each reflecting layer of a sample. We also describe the applicatoin of optical near-field techniques to the THz imaging system. Substantial improvements in teh spatial resolution are demonstrated.