A DFB laser diode (1.57 µm) is guided through a pure core fused silica fiber. Tuning the laser frequency across molecular resonances will change the frustrated (FTR) and the attenuated total reflection (ATR). Such an evanescent-field laser sensor is used for in-situ monitoring of H2S in volcano gases at the site “Solfatara”(Italy).
The P(26) rotational line of carbon monoxide is traced with a mid-infrared laser in a methaneiair combustion. 3-dimensional tomographid images of the relative carbon monoxide concentrations in the flame are computerized from the absorption data.Summary. Carbon monoxide is an important combustion-generated species. Since it has strong fundamental absorption lines in the mid-infrared spectrum, it can be traced by absorption spectroscopy using differencefrequency generation in AgGaS2 as a nairow bandwidth laser source. The computerized tomography of carbon
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