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Rotational spectra of the methylamine and acetaldehyde molecules were recorded in the frequency range between 80 and 120 GHz with sub-Doppler spectral resolution. Such resolution was achieved by means of Lamb-dip observation. The main aim of this study was to search for the torsionally mediated anomalous high-J hyperfine splittings in acetaldehyde and methylamine molecules, similar to that ones recently...
We report on the first demonstration of a quartz enhanced photo-acoustic (QEPAS) sensor in the Terahertz (THz) range. The sensor is based on a QCL emitting at 3.93 THz and a customized quartz tuning fork. For methanol detection we reached a normalized noise-equivalent absorption of 2×10−10 cm−1W/Hz½ comparable with the best result of mid-IR QEPAS.
A Lamb wave sensor to measure the concentration of methanol solution in direct methanol fuel cell (DMFC) systems was designed, fabricated and evaluated. The sensor piezoelectrically generates the lowest antisymmetric mode (A0-mode) Lamb wave on a suspended thin AlN/SiO2/Si composite membrane, and confines a standing wave with edge reflectors. The fabricated sensor showed an almost constant sensitivity...
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