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Highly sensitive high-temperature optical thermometry enabled by dual-emission design exploiting opposite thermal
Lixin Peng1, Junshan Hu1, Jia Fu1
1School of science, Key Laboratory of High Performance Scientific Computation, Xihua University, Chengdu 610039, China.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|December 12, 2025
Summary
A new dual-emission optical thermometry method uses YVO4:Eu3+ & CaMoO4:Er3+ composites for accurate non-contact temperature measurements. This approach enhances sensitivity at high temperatures, overcoming limitations of traditional fluorescence intensity ratio techniques.
Area of Science:
- Materials Science
- Optical Engineering
- Thermodynamics
Background:
- Non-contact optical thermometry is crucial for harsh aerodynamic and propulsion environments.
- Conventional fluorescence intensity ratio (FIR) thermometry struggles at high temperatures due to decreased sensitivity.
Purpose of the Study:
- To develop a novel dual-emission optical thermometry technique for improved high-temperature measurements.
- To overcome the limitations of FIR thermometry related to temperature-dependent population distribution.
Main Methods:
- Utilized a composite system of YVO4:Eu3+ & CaMoO4:Er3+.
- Employed a common 380 nm excitation source.
- Developed a dual-emission approach summing opposite monochromatic sensitivities.
Main Results:
- Eu3+ and Er3+ emissions showed opposite, monotonic temperature dependencies.
- Achieved enhanced overall sensitivity in the high-temperature range.
- Recorded a maximum relative sensitivity (Sr) of 1.85%·K−1 at 633 K.
- Maintained temperature uncertainty (ΔT) below 1 K even at 743 K.
Conclusions:
- The developed dual-emission thermometry overcomes the ΔE/kBT2 limitation of traditional methods.
- Provides a reliable, high-performance solution for non-contact surface temperature diagnostics.
- Demonstrated effectiveness in simulated wind tunnel conditions.
