Related Experiment Video
Updated: Jun 5, 2026
Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
Published on: December 18, 2015
Simultaneous measurements of CO2 and CO using a single distributed-feedback (DFB) diode laser near 1.57 μm at
Tingdong Cai1, Guangzhen Gao, Weidong Chen
1College of Physics and Electronic Engineering, Xuzhou Normal University, Xuzhou 221116, P.R. China. caitingdong@126.com
Abstract:
A sensor using a single distributed-feedback (DFB) diode laser at 1.57 μm for the simultaneous measurement of CO(2) and CO concentration at elevated temperatures is developed. A proper line pair near 6361.250 and 6361.344 cm(-1) is chosen based on absorption strength, separation of the two lines, and isolation from interference of neighboring transitions of the major combustion gases. The concentrations of CO(2) and CO are inferred from their wavelength modulation spectroscopy (WMS) 1ƒ-normalized absorption-based WMS-2ƒ signal peak heights. The CO(2) and CO concentration measurements are within 3.3% and 5% of the expected values over the full temperature range.
