Research progress and application of mid-infrared cavity ring-down spectroscopy
The fingerprint absorption spectrum of mid-infrared fundamental frequency is characterized by strong ab-sorption,broad and dense spectral lines.In general,as molecules absorbing infrared spectra have mid-infrared base-frequency absorption intensity near 3000 cm-1 that is about two orders of magnitude higher than that of the near-infra-red absorption,and thus it has gradually become a research hotspot for cavity ring-down spectroscopy(CRDS)tech-nology.In this paper,the working principle and technical advantages of CRDS technology are briefly described,and the characteristics of mid-infrared CRDS technology are introduced.Moreover,the differences between near infrared and mid-infrared CRDS technology are analyzed and compared.The research status of CRDS technology based on mid-infrared band is discussed finally.
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