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Method and apparatus for background signal reduction in opto-acoustic absorption measurement

机译：用于光声吸收测量中的背景信号减少的方法和装置

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The sensitivity of an opto-acoustic absorption detector is increased to make it possible to measure trace amounts of constituent gases. A second beam radiation path is created through the sample cell identical to a first path except as to length, alternating the beam through the two paths and minimizing the detected pressure difference for the two paths while the beam wavelength is tuned away from the absorption lines of the sample. Then with the beam wavelength tuned to the absorption line of any constituent of interest, the pressure difference is a measure of trace amounts of the constituent. The same improved detector may also be used for measuring the absorption coefficient of known concentrations of absorbing gases.

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年度 1976
页码 1-5
总页数 5
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
ACOUSTO-OPTICS; BACKGROUND RADIATION; ELECTROMAGNETIC ABSORPTION; SIGNAL TRANSMISSION; ABSORPTIVITY; GAS DETECTORS; LIGHT TRANSMISSION; TRACE ELEMENTS;

机译：声光;背景辐射;电磁吸收;信号传输;吸收;气体探测器;光传输;微量元素;

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Method and apparatus for background signal reduction in opto-acoustic absorption measurement

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