ScVO₄:Bi³⁺ thermographic phosphor particles for fluid temperature imaging with sub-°C precision

Area of Science:

• Materials Science
• Optical Thermometry
• Fluid Mechanics

Background:

• Accurate temperature measurement is crucial for understanding fluid dynamics.
• Existing thermographic phosphor methods face limitations in dynamic environments.

Purpose of the Study:

• To synthesize and characterize ScVO4:Bi3+ thermographic phosphor particles.
• To demonstrate a novel, high-precision temperature imaging method for fluid flows.

Main Methods:

• Synthesis and characterization of ScVO4:Bi3+ particles.
• Development of a single laser/camera luminescence lifetime dual-frame ratio-based method.
• Application in near-ambient temperature liquid flow experiments.

Main Results:

• High temperature sensitivity of ScVO4:Bi3+ particles (up to 6%/°C).
• Achieved single-shot, single-pixel temperature precision better than ±0.4°C (1σ) from 20-60°C.
• Demonstrated >5x improvement over previous thermographic phosphor techniques.

Conclusions:

• The developed method enables sensitive, rapid temperature imaging in dynamic fluid mechanics.
• The ScVO4:Bi3+ phosphor offers a significant advancement for thermal science applications.
• The technique is applicable to both gas and liquid flows with microsecond-level measurement durations.