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A flexible and compact digital lock-in detection system, with software-based balanced detection for tuneable diode-laser spectroscopy measurements is described. The system is based on two data acquisition cards for a standard computer. One data acquisition card contains a software-controlled arbitrary waveform generator (CH-3150, Exacq Technologies) that is used for laser modulation. A pigtailed single...
We demonstrate the possibility of non-intrusive in-vivo human sinus studies by diode laser gas absorption spectroscopy. Molecular oxygen in tissue-like phantoms were investigated in a practical backscattering detection geometry for frontal sinus studies both experimentally and numerically using the Monte Carlo concept, implemented in the Advanced Systems Analysis Program (ASAPtrade) software. Light...
The present communication is mainly focused on molecular oxygen detection in porous organic matter, through a tunable diode laser spectroscopy. Initial measurements on wood were preformed in order to illustrate the influence of the density and anisotropy of the sample on the GASMAS-signal. Additional measurements were performed on horticultural produces, in which the concentration of the molecular...
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