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Lasers are becoming more and more common and can damage eyes and sensors, so arise the need for efficient protection. A possibility is the use of filters with optical limiting abilities. Optical limiting leads to a reduced transmittance of these filters above a certain light energy. Solid‐state optical limiting filters consist frequently of poly(methyl methacrylate) (PMMA). Using dyes is an often...
Explosives detection has been performed in terahertz and Raman frequency bands using chemometric tools. We applied principal component models to compare the performances of terahertz and Raman spectra ibn explosives analysis, as well as binary and ternary explosive mixtures.
We introduce the use of Time-Frequency (TF) filtering applied to Terahertz Time-Domain Spectroscopy (THz-TDS) data in order to extract valuable information hidden into the noise floor. The Short Time Fourier Transform (STFT) provides a spectrum analysis in time, we optimized its Gaussian window in order to analyse and filter the THz signals of substances. The formalism presented allows an efficient...
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