Research on Temperature Distribution Reconstruction of Deflagration Fields via Spectral-Image Fusion.

Area of Science:

• Non-contact temperature measurement
• Blackbody radiation theory
• Optical diagnostics

Background:

• Multispectral temperature measurement relies on blackbody radiation but is limited to single-point measurements.
• Accurate non-contact temperature measurement is crucial in various industrial and scientific applications.

Purpose of the Study:

• To develop a spectral fusion temperature measurement device for 2D temperature field reconstruction.
• To propose a novel method for fusing spectral and imaging data to map deflagration fireball temperatures.
• To overcome the limitations of single-point temperature measurement technologies.

Main Methods:

• A parallel optical axis device integrating a CCD sensor and fiber optic spectrometer was developed.
• Photo-response non-uniformity (PRNU) was used to validate CCD accuracy.
• A least squares optimization fitting method combined spectral and imaging data for 2D temperature reconstruction.

Main Results:

• The developed device achieved a PRNU value below 2.2% at 9 meters.
• The spectral fusion method successfully reconstructed 2D temperature fields for deflagration fireballs.
• The proposed method yielded an average relative error of approximately 3.3% compared to conventional spectral inversion.

Conclusions:

• The spectral fusion method effectively reconstructs 2D temperature fields of deflagration fireballs.
• This technology enhances non-contact temperature measurement capabilities beyond single-point limitations.
• The study demonstrates a significant advancement in thermal imaging and diagnostics for dynamic events.