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Development and application of real-time (>5 Hz) first-surface and bulk reflection measurements using the mini-Z THz time-domain-spectrometer (TDS) are presented for standoff detection and identification of organic, pharmaceutical and energetic compounds. A non-iterative baseline correction for scattering is applied to real-time data to expand THz sensing across a wider range of sample preparation...
The presence of hair follicles in human skin appear not to disturb Terahertz (THz) transmission, but existing measurements made on human head hair show conflicting results on THz scattering. It is not known if large numbers of hair strands protruding from skin would affect THz transmission. This scenario is distinct from measuring clumps of head hair because hair strands on skin (particularly on animals)...
A differential absorption spectroscopic system is developed for gas monitoring at sub-millimeter wavelengths. Tunable, narrowband terahertz (THz) pulse trains are generated using optical pulse trains obtained by an adjustable pulse shaping technique. By tuning the THz frequency at or away from the resonant frequency, differential data are obtained to determine the water vapor concentration. After...
We report THz spectroscopic measurement of selected gasoline (#87, #89, and #93) in 5 cm/sup -1/ to 650 cm/sup -1/ region by using Fourier transform far infrared spectroscopy and time-domain THz spectroscopy. New absorption resonances are identified.
We demonstrate three-dimensional terahertz (THz) holography with the use of the windowed Fourier transformation. The coherent nature of THz time domain spectroscopy allows measurement of the phase and amplitude of the THz wave for holographic imaging.
We measured the extinction coefficient and refractive index (0.2-2.0 THz) of methyltrimethoxysilane (MTMOS) sol-gel, a bio-encapsulating polymer. Its low extinction coefficient makes it a promising matrix material for THz bio-sensing and biological spectroscopy.
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