Abstract

A sensor using a single distributed-feedback (DFB) diode laser at 1.57 μm for the simultaneous measurement of CO₂ 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 CO₂ and CO are inferred from their wavelength modulation spectroscopy (WMS) 1ƒ-normalized absorption-based WMS-2ƒ signal peak heights. The CO₂ and CO concentration measurements are within 3.3% and 5% of the expected values over the full temperature range.

Diode-laser absorption measurements of CO₂ near 2.0 μm at elevated temperatures

Radu M. Mihalcea, Douglas S. Baer, and Ronald K. Hanson
Appl. Opt. 37(36) 8341-8347 (1998)

In situ combustion measurements of CO₂ by use of a distributed-feedback diode-laser sensor near 2.0 µm

Michael E. Webber, Suhong Kim, Scott T. Sanders, Douglas S. Baer, Ronald K. Hanson, and Yuji Ikeda
Appl. Opt. 40(6) 821-828 (2001)

Measurements of CO₂ concentration and temperature at high pressures using 1f-normalized wavelength modulation spectroscopy with second harmonic detection near 2.7 μm

A. Farooq, J. B. Jeffries, and R. K. Hanson
Appl. Opt. 48(35) 6740-6753 (2009)

Single-ended mid-infrared laser-absorption sensor for simultaneous in situ measurements of H₂O, CO₂, CO, and temperature in combustion flows

Wen Yu Peng, Christopher S. Goldenstein, R. Mitchell Spearrin, Jay B. Jeffries, and Ronald K. Hanson
Appl. Opt. 55(33) 9347-9359 (2016)

Simultaneous and interference-free measurements of temperature and C₂H₄ concentration using a single tunable diode laser at 1.62 µm

Guangzhen Gao, Ting Zhang, Gang Zhang, Xin Liu, and Tingdong Cai
Opt. Express 27(13) 17887-17904 (2019)