[PDF] Top 20 Time frequency analysis in terahertz pulsed imaging

... that time, workers have introduced alternative acquisi- tions designed to improve one or more aspects of the ...Dark-field imaging [Loeffler et ...diffraction imaging has been developed [Ruffin et ... See full document

... Nevertheless, pulsed THz QCL operation yields superior performance over short timescales compared with cw operation, owing to the lower internal Joule heating within the THz QCL, and hence higher optical gain, ... See full document

... categories: pulsed broadband and continuous ...For pulsed THz detection, in THz time domain systems, coherent detectors are ...-wave terahertz (CW-THz) system is less expensive and more ... See full document

... light source. A PZT actuator was introduced to shift the phase of the reference beam, which allows the phase-shifting method [12] to be used to increase the measurement sensitivity. One distinct feature of our OCT system ... See full document

... 0.3mm thickness was taken as steel substrate, and the paint layers were successively coated on the steel substrate to mimic the coating samples. The protective coating was treated as a linear isotropic homogeneous layer ... See full document

... Temperature change contributes to laser behavior in a number of complex ways, including altering the refractive index and the physical dimensions of the internal laser cavity [13], which in turn alter the lasing emission ... See full document

... varying frequency and amplitude profile, as well as covering a large angular ...element analysis, for ...the frequency bandwidth of the excitation ... See full document

... The terahertz gap has a frequency ranges from ...The terahertz radiations are invisible to naked ...non-invasive. Terahertz spectroscopy enables 3D imaging of structures and materials, ... See full document

... thermal frequency sweep that augments the adiabatic ...total frequency sweep [part(c)] in pulsed mode is both significantly larger and exhibits greater departure from linearity than that of cw ... See full document

... The time domain traces were acquired at each node of a 101 × 101 square grid with spatial resolution of 200 µm (standard resolution), or on a 51 × 301 rectangular grid with spatial resolution of 50 µm (high ...128 ... See full document

... band pulsed array has the bene fi t of being able to locate defects with a single ...were pulsed simultaneously, which precludes the requirement for phased array ...the analysis of the pulsed ... See full document

... imaging system. All the inner objects, such as a knife, a bottle and a gun, are clearly identified.. .................................................................. 34 Figure. 2.16 Refractive index as a ... See full document

... as artefacts brought about by the driving circuit [Fig. 2(f)]. This signal is then amplified and digitised using a Rohde & Schwarz RTO1024 oscilloscope [Fig. 2(g)]. The bandwidth of the RTO1024 was restricted to 500 ... See full document

... by frequency instability of the laser, caused by temperature and current ...in frequency drifts on the order of several MHz over time-scale of seconds [20, ...maximum frequency drift of ~10 ... See full document

... these time-domain traces to the steady-state solution of the Lang and Kobayashi model [38], one obtains images through plotting the spatial variations in feedback parameter ... See full document

... Such analysis results in a volume of 56 mm 3 and 58 mm 3 for the case of the silicon oil in samples S08 and S09, respec- tively and, more importantly, a volume for the SNEDD system of 35 mm 3 and 54 mm 3 for ... See full document

... THz imaging to other biological samples. THz pulsed imaging actually can be viewed as an extension of the THz-Time domain spectroscopy (TDS) ...samples. Terahertz imaging offers ... See full document

... high frequency tail in the amplitude spectrum from the thinnest ...each frequency, different inclusion criteria based on the noise level were applied for the two calculated ...given frequency were ... See full document

... triangular element. The intra- and inter-tablet coating thickness distributions can then be analysed based on the values of the coating thickness on each triangular element. Using this image analysis method, the ... See full document

... FCC in combination with a superdisintegrant (Stirnimann et al., 2013), which primarily drives the swelling and thus builds up an internal stress, facilitates the design of a desired disintegration behaviour as each ... See full document