Abstract

A single diode laser absorption sensor (near 1477 nm) useful for simultaneous temperature and H₂O concentration measurements is developed. The diode laser tunes approximately 1.2 cm^-1 over three H₂O absorption transitions in each measurement. The line strengths of the transitions are measured over a temperature range from 468 to 977 K, based on high-resolution absorption measurements in a heated static cell. The results indicate that the selected transitions are suitable for sensitive temperature measurements in atmospheric pressure combustion systems using absorption line ratios. Comparing the results with HITRAN 96 data, it appears that these transitions will be sensitive over a wide range of temperatures (450-2000 K), suggesting applicability for combustion measurements.

Multiplexed diode-laser sensor system for simultaneous H₂O, O₂, and temperature measurements

D. S. Baer, R. K. Hanson, M. E. Newfield, and N. K. J. M. Gopaul
Opt. Lett. 19(22) 1900-1902 (1994)

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)

Absorption line shift with temperature and pressure: impact on laser-diode-based H₂O sensing at 1.393 µm

Richard Phelan, Michael Lynch, John F. Donegan, and Vincent Weldon
Appl. Opt. 42(24) 4968-4974 (2003)

Tunable diode-laser absorption measurements of methane at elevated temperatures

V. Nagali, S. I. Chou, D. S. Baer, R. K. Hanson, and J. Segall
Appl. Opt. 35(21) 4026-4032 (1996)

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)