Abstract
A spectrophone with low resonant frequency compatible with the repetition frequency of a pulsed discharge CO laser is described. The spectrophone is used for humidity detection in hydrogen and air. The simple and inexpensive system provides a detection capacity of 10–100ppb/\(\sqrt {\operatorname{Hz} } \). The responsivity of the resonant spectrophone is interpreted taking the dependence of the acoustical quality factor on the geometry into account.
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References
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A more detailed description of this laser will be given elsewhere
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