A5008676258- Laser-induced spectroscopy and plasma
- Mercury impact and mitigation studies
- Analytical chemistry methods development
- Advanced Optical Imaging Technologies
- DNA and Biological Computing
- Random lasers and scattering media
- Image and Video Quality Assessment
- Chaos-based Image/Signal Encryption
- Genetics, Bioinformatics, and Biomedical Research
Shahid Beheshti University
2015-2020
We introduce sinusoidal ghost imaging (SGI), which uses 2D orthogonal patterns instead of random in "computational imaging" (CGI). Simulations and experiments are performed. In comparison with the"differential algorithm that was used to improve the SNR imaging, results SGI show about 3 orders magnitude higher SNR, can be reconstructed even a much smaller number patterns. More importantly, based on results, provides great opportunity generate innate processed images by predefined selection...
A one-dimensional numerical model is presented on a copper sample to investigate double-pulse laser induced breakdown spectroscopy (DP-LIBS). The effect of the inter-pulse delay time material ablation, plasma homogeneity, and signal enhancement examined. dynamics plume expansion, formation, radiation ionized neutral atoms in presence helium background gas at pressure 1 atm are studied. heat conduction equation solved coupled fluid dynamic equations through Knudsen layer relations....
Signal enhancement in laser-induced breakdown spectroscopy (LIBS) is the concern of many research groups. In order to increase spectral emission LIBS, a combination electrical spark and (SA-LIBS) on heated sample (SA-LIBS-HS) studied. The mechanism increasing signal examined, comparison between calculated experimental one done. It shown that plasma temperature amount ablation mass are main factors for enhancement. As secondary source excitation, leads an temperature. Heating causes By...