Authors:

Yash Ajay Shah

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About Paper:

Diffuse Back-Illumination Extinction Imaging (DBI-EI) has emerged as a promising technique for concentration measurements due to its resilience to beam-steering and its compatibility with harsh flow environments. However, quantitative interpretation of results is hindered by the current lack of comprehensive studies comparing measurement accuracy under well-controlled illumination and collection conditions, as well as across a range of known particle concentrations. This work aims to assess the performance of DBI-EI using both collimated and diffuse illumination schemes, with a particular focus on quantifying extinction across a range of particle loadings. Extinction measurements will be acquired under controlled conditions using silicon dioxide (SiO2) particles with known size distributions, measured by a Malvern Mastersizer 3000, enabling precise comparison between theoretical predictions and experimental results. Through this work, we aim to determine the variance in measured line-of-sight optical depth associated with particle field conditions. Ultimately, this study will support the development of calibrated, high-speed extinction diagnostics for application in transient, harsh, and optically challenging environments such as spray combustion and post-detonation fireballs. Keywords: [no keywords provided]

Source:

Purdue University / 2025

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Co-authors:

Yash Ajay Shah