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

Area of Science:

• Materials Science
• Combustion Science
• Nanotechnology

Background:

• Studying nanopowder surfaces during high-temperature combustion, especially for aluminum-based materials, is challenging due to luminous plasma interference.
• Existing methods struggle with noncontact observation of surface changes in such extreme environments.

Purpose of the Study:

• To investigate the efficacy of laser speckle correlation (LSC) for remote characterization of aluminum nanopowder surface changes during combustion.
• To demonstrate LSC's capability in overcoming the limitations posed by luminous plasma in high-temperature environments.

Main Methods:

• Employed laser speckle correlation (LSC) as a noncontact observation technique.
• Conducted remote observations of aluminum nanopowder combustion in air up to a distance of 5 meters.
• Validated LSC results using simultaneous high-speed video recording, speckle pattern correlation analysis, and comparison with direct observation.

Main Results:

• Laser speckle correlation (LSC) effectively characterized surface changes in aluminum nanopowder during combustion.
• The method proved efficient for remote observation of objects obscured by luminous plasma.
• Successful remote characterization was achieved at distances up to 5 meters.

Conclusions:

• Laser speckle correlation (LSC) is a viable and efficient noncontact method for studying nanopowder surfaces during high-temperature combustion.
• The simplicity of LSC hardware suggests broad applicability for analyzing various high-temperature processes.
• LSC offers a promising alternative for in-situ surface analysis in challenging combustion environments.