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- W1996554035 abstract "Low concentration pollutants in the atmosphere can be detected by their infrared absorption spectrum. We use a diode laser spectrometer in a dual beam configuration for this purpose. The laser source is frequency modulated to provide the sensitivity enhancement associated with derivative spectroscopy. One of the laser beams is passed through a reference cell containing the gas to be detected in order to lock the laser frequency to the center of the absorption line. The other beam passes through a White cell with 64 in absorption path length. Sample air is sucked through this cell at a pressure of about 100 mbar. Although the pressure reduction reduces the density of absorbing molecules by a factor of ten, the increase in absorption cross section due to the norrowing linewidth nearly compensates this effect and drastically reduces interference from other gases. The absorption is observed as a modulation of the laser intensity at twice the modulation frequency. The intensity modulation is proportional to the second derivative of the absorption line. The spectrometer was used in a field experiment on board a research vessel in the North Sea for the measurement of HC] in the plume of incineration ships. An HC1 detection sensitivity of 100 ppb1/Hz was achieved." @default.
- W1996554035 created "2016-06-24" @default.
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- W1996554035 date "1981-09-08" @default.
- W1996554035 modified "2023-10-05" @default.
- W1996554035 title "<title>Sensitive Detection Of Hydrogen Chloride By Derivative Spectroscopy With A Diode Laser</title>" @default.
- W1996554035 doi "https://doi.org/10.1117/12.965812" @default.
- W1996554035 hasPublicationYear "1981" @default.
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