Focused light-field multispectral radiation thermometry with enhanced spatial resolution

Area of Science:

• Optical Engineering
• Thermodynamics
• Spectroscopy

Background:

• Accurate temperature measurement is critical for high-temperature applications like combustion diagnostics and turbine systems.
• Visible-band multispectral thermometry is preferred over infrared due to better gas absorption resistance.
• Conventional methods face challenges with system complexity and limited spatial resolution.

Purpose of the Study:

• To develop a novel method for high-resolution, single-shot temperature measurement in high-temperature environments.
• To enhance spatial resolution without compromising measurement accuracy.
• To provide a compact and robust solution for advanced thermometry.

Main Methods:

• Proposed a focused light-field multispectral radiation thermometry (FLF-MRT) technique.
• Reallocated sampling between spatial and angular dimensions for improved data acquisition.
• Utilized single-shot acquisition for spatial and spectral information.

Main Results:

• Achieved a fourfold increase in spatial resolution, from 0.096 mm/pixel to 0.024 mm/pixel.
• Maintained high measurement accuracy with a relative temperature error below 0.5% across 1200-1600°C.
• Demonstrated the feasibility of FLF-MRT in experimental settings.

Conclusions:

• The FLF-MRT method offers a significant advancement in high-resolution temperature measurement.
• This technique provides a compact, robust, and accurate solution for challenging environments.
• Enables improved diagnostics in fields like combustion and turbine engineering.