A compact and portable laser-based sensor has been developed for absolute measurements of CO2 concentration with high precision and accuracy, in air samples at atmospheric pressure. A DFB diode laser, operating near 2 mum at room temperature, was used. It was tuned into resonance with the R(34) line of the nu (1)+nu (degrees)(2)+nu (3) combination band. The laser beam was fiber-coupled in order to allow remote operation. Severe tests of the spectrometer were done using certified air mixtures, with the aim to determine its performance. Applications to atmospheric monitoring were discussed. Particularly, the suitability of our spectrometer for measuring soil CO2 efflux was demonstrated.
High-precision measurements of CO 2 concentration in air by means of diode-laser absorption spectroscopy near 2 μm
Gagliardi, Gianluca;Gianfrani, Livio
2001
Abstract
A compact and portable laser-based sensor has been developed for absolute measurements of CO2 concentration with high precision and accuracy, in air samples at atmospheric pressure. A DFB diode laser, operating near 2 mum at room temperature, was used. It was tuned into resonance with the R(34) line of the nu (1)+nu (degrees)(2)+nu (3) combination band. The laser beam was fiber-coupled in order to allow remote operation. Severe tests of the spectrometer were done using certified air mixtures, with the aim to determine its performance. Applications to atmospheric monitoring were discussed. Particularly, the suitability of our spectrometer for measuring soil CO2 efflux was demonstrated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
