Work

Toward inverse backscatter absorption gas imaging: imaging a dry gas plume with ambient H2O absorption

Year: 2025

Type: article

Abstract: This paper introduces inverse backscatter absorption gas imaging (iBAGI), a transparent gas imaging technique based on absorption spectroscopy of gases naturally present in ambient air being displaced by transparent gases. We demonstrate reconstruction of a 2-D image of a dry gas plume by measuring light of a raster-scanned diode laser tuned to an absorption line of atmospheric H2O. We quantify the performance depending on the distance to the backdrop and show that the key transmission metric is independent of absorption path length. We conclude with an outlook toward calibration-free, single-ended iBAGI using scattering from low-reflectivity backdrops.

Source: Optics Express

DOI: 10.1364/oe.553773

Authors: Joseph C. Klug, Matthias Beuting, Scott T. Sanders

Institution: University of Wisconsin–Madison

Language: English

Topic: Spectroscopy and Laser Applications

Subfield: Spectroscopy

Field: Chemistry

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funders: Advanced Research Projects Agency - Energy, Grainger Institute for Engineering, University of Wisconsin-Madison