Work

Dual-band scanned-wavelength infrared laser-induced fluorescence of CO with time-domain modeling for 1 kHz thermometry

Year: 2026

Type: article

Abstract: Infrared laser-induced fluorescence (IR-LIF) can provide spatially resolved thermometry and speciation via stable molecular species; however, prior techniques have been limited by low repetition rates (e.g., 10 Hz) and large background emission in hot environments. This manuscript presents a dual-band scanned-wavelength IR-LIF diagnostic for calibration-free thermometry at 1 kHz. A quantum-cascade laser (2013.3 cm −1 ) and tunable optical parametric oscillator (4297.7 cm −1 ) were used to scan across rovibrational transitions of CO, and a time-domain LIF model was developed to infer the local absorption lineshapes from the LIF signals despite pronounced pumping and decay transients. This enabled accurate thermometry in a heated jet up to 800 K and characterization of temperature profiles in a CO/H 2 /Ar diffusion flame at atmospheric pressure.

Source: Optics Express

DOI: 10.1364/oe.611465

Authors: Garrett C. Mathews, Jonathan Rustad, Christopher S. Goldenstein

Institutions: University of Colorado Boulder, Purdue University West Lafayette

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: National Science Foundation