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Tunable Infrared Laser Absorption Spectroscopy of Aluminum Monoxide $$A^2\Pi_i $$–$$X^2\Sigma^+$$.

Journal Article · · Journal of Quantitative Spectroscopy and Radiative Transfer

We report the details of an infrared, laser absorption diagnostic capable of quantifying aluminum monoxide temperature and column density at 100 kHz repetition rate. This novel technique employs a near infrared MEMS-VCSEL to measure rotationally resolved optical absorption spectra of aluminum monoxide $$A^2\Pi_i$$ - $$X^2\Sigma^+$$ from approximately 7400 –7900 cm-1. Temperatures and column densities are extracted from model regressions to provide temporally resolved thermochemical information on aluminum oxidation reactions. The measurement capability is demonstrated by performing 100 kHz measurement in the plume of an exploding bridgewire with measured temperatures of 3450–3100 K and column densities of 1– 11 x 1016cm -2. To the authors knowledge, this is the first use of the AlO $$A^2\Pi_i$$ - $$X^2\Sigma^+$$ transition to characterize aluminum combustion environments. Details regarding signal extraction and calibration of MEMS-VCSEL spectra are also included. Although unsuccessful, efforts to extract kinetic temperature and column density from simultaneously measured, atomic aluminum 2P3/2,1/2-2S1/2 transitions at 7618 cm-1 and 7602 cm-1 are also described.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003525
OSTI ID:
1894595
Alternate ID(s):
OSTI ID: 1872167
Report Number(s):
SAND2022-0156J; 702755
Journal Information:
Journal of Quantitative Spectroscopy and Radiative Transfer, Journal Name: Journal of Quantitative Spectroscopy and Radiative Transfer Vol. 279; ISSN 0022-4073
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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