Laser speckle correlation technique application for remote characterization of metal nanopowder combustion

L. Li; F. A. Gubarev; Y. Cao; I. D. Liushnevskaya; A. V. Mostovshchikov; A. V. Mostovshchikov

doi:10.1364/AO.425696

Applied Optics
Vol. 60,
Issue 22,
pp. 6585-6592
(2021)
•https://doi.org/10.1364/AO.425696

Laser speckle correlation technique application for remote characterization of metal nanopowder combustion

L. Li, F. A. Gubarev, Y. Cao, I. D. Liushnevskaya, and A. V. Mostovshchikov

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L. Li, F. A. Gubarev, Y. Cao, I. D. Liushnevskaya, and A. V. Mostovshchikov, "Laser speckle correlation technique application for remote characterization of metal nanopowder combustion," Appl. Opt. 60, 6585-6592 (2021)

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Abstract

High temperature and luminous plasma make it difficult to study the surface of nanopowders during combustion, particularly, the combustion of aluminum-based nanopowders. The noncontact observation method–laser speckle correlation (LSC) in this work is used for remote characterization of changes in the surface of aluminum nanopowder during combustion in air. The observation results using LSC at a varying distance of up to 5 m were verified by simultaneous high-speed video recording of speckle patterns, analyzing the correlation coefficient of speckle patterns, and comparing the data obtained with direct observation of the combustion process. The results demonstrated the efficiency of using the LSC method for remote characterization of changes in the surface of an object shielded by a luminous layer. The simple hardware implementation makes the LSC method potentially more valuable in the study of various high-temperature processes.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Combustion Velocities (mm/s)
	$L_{I L A S 1} = 0.4 m$ $L_{H S C 1} = 0.4 - 5 m$				$L_{I L A S 1} = L_{H S C 1} = 0.4 - 5 m$
	$L_{H S C 2} = 0.4 m$				$L_{H S C 2} = 0.4 m$
	1st wave		2nd wave		1st wave		2nd wave
Distance (m)	HSC1	HSC2	HSC1	HSC2	HSC1	HSC2	HSC1	HSC2
0.4	0.788	0.788	1.153	1.153	0.788	0.788	1.153	1.153
1	0.7	0.7	1.414	1.414	0.584	0.584	1.109	1.109
2	0.775	0.717	1.885	1.897	0.556	0.556	0.816	0.858
3	1.228	1.228	1.507	1.368	0.664	0.645	0.865	0.836
4	0.817	0.81	1.228	1.17	0.42	–	0.595	0.559
5	0.934	0.903	1.418	1.371	0.522	0.623	0.623	0.505
	$L_{I L A S 1} = L_{H S C 1} = 0.4 - 5 m$				$L_{I L A S 1} = L_{H S C 1} = 0.4 - 5 m$
	$L_{I L A S 2} = L_{H S C 2} = 0.4 m$				$L_{I L A S 2} = L_{H S C 2} = 0.4 m$
	200 ms HSC1 exposure				100 ms HSC1 exposure
	1st wave		2nd wave		1st wave		2nd wave
Distance(m)	HSC1	HSC2	HSC1	HSC2	HSC1	HSC2	HSC1	HSC2
0.4	0.816	0.856	1.292	1.292	0.759	0.735	1.252	1.236
1	0.711	0.722	0.909	0.844	0.492	0.501	0.761	0.781
2	0.686	0.559	1.099	0.771	0.817	0.52	0.932	0.851
3	0.589	0.495	0.839	0.654	–	0.501	–	0.525
4	0.575	0.372	0.762	0.601	–	0.399	–	0.519
5	0.438	0.289	0.674	0.516	–	0.266	–	0.393

Abstract

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Applied Optics