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首页> 美国政府科技报告 >Trace water vapor detection in nitrogen and hydrogen chloride gases by FTIR spectroscopy
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Trace water vapor detection in nitrogen and hydrogen chloride gases by FTIR spectroscopy

机译：用FTIR光谱法检测氮气和氯化氢气体中的水蒸气

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An optical instrument for the determination of trace H(sub 2)0 in N(sub 2) and HCI gases has been built. It is based on a commercial Fourier transform infrared spectrometer (modified to improve the purge), a long-path gas cell, and classical least squares data analysis. The optimum instrumental parameters have been determined. Particularly important, is the finding that maximal precision is obtained at low resolution, implying that future instruments may be based on less expensive, low-resolution spectrometers. A calibration over the range of 40 to 1800 ppB has been performed and found to be in good agreement with published spectral data. Also, detection limits have been shown to be about 10 ppB. Suggestions are made to improve the design of the instrument.

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