Three-dimensional temperature field measurement of flame using a single light field camera

Area of Science:

• Thermodynamics
• Optical Engineering
• Combustion Science

Background:

• Conventional cameras capture only intensity, limiting 3D information.
• Light field cameras record both intensity and direction of light rays.
• Accurate 3D temperature field reconstruction is crucial for understanding flame dynamics.

Purpose of the Study:

• To propose a novel method for reconstructing the 3D temperature field of a flame.
• To utilize a single light field camera for flame radiative imaging.
• To validate the proposed reconstruction method through simulations and experiments.

Main Methods:

• Modeling radiative imaging using a light field camera and geometrical optics.
• Applying the radiative transfer equation to model principal ray intensities.
• Solving the mathematical model using the least square QR-factorization (LSQR) algorithm.

Main Results:

• Successful reconstruction of the 3D temperature field of a flame.
• Demonstrated validity of the light field camera-based method.
• Numerical simulations and experimental results confirm the method's capability.

Conclusions:

• The proposed method effectively reconstructs 3D flame temperature fields using a single light field camera.
• This technique offers a promising approach for advanced flame diagnostics.
• Further research can explore applications in various combustion and thermal analysis scenarios.