Consiglio Nazionale Delle Ricerche

Giovanni Giusfredi

Paolo De Natale

Pablo Cancio Pastor

Davide Mazzotti

Iacopo Galli

The present invention is relative to a method of ring-down spectroscopy in saturated-absorption condition, for measuring a first concentration of a gas through a measurement of the spectrum of a molecular transition of said gas.

Method for measuring the concentration of trace gases by SCAR spectroscopy

The present invention relates to a ring-down spectrometry apparatus in absorption saturation condition, for measuring the concentration of a gas through a measurement of the spectrum of a molecular transition of said gas. The apparatus includes a laser source, an adjuster for varying the wavelength of said radiation emitted by said laser, and a resonant cavity. A photodetector is adapted to detect an electromagnetic radiation beam and is adapted to generate a decay signal. An electronic circuit receives the signal from the photodetector and is adapted to convert it to a processor. A processor is adapted to receive said decay signal from the photodetector and perform interpolation to obtain a concentration of said gas.

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Campi Bisenzio, Italy

Giovanni Giusfredi