Differential optical absorption spectroscopy measurement of CO_(2) using a nanosecond white light continuum

摘要

We built a differential optical absorption spectroscopy system to measure near-surface CO_(2) absorption in the atmosphere using a nanosecond white light continuum. The white light laser can cover wavelengths ranging from 420 to 2400 nm, where the CO_(2) and H_(2)O absorption lines are located. At an optical path length of 568 m, it was possible to evaluate atmospheric CO_(2) concentration from absorption bands of CO_(2) and H_(2)O in the vicinity of 2000 nm detected by broadband white light simultaneously.