Spectro-Temporal Ratiometric Strategy for Thermally Invariant Optical Manometry

Area of Science:

• Materials Science
• Optical Engineering
• Sensing Technology

Background:

• Optical manometry offers noncontact pressure sensing but is susceptible to temperature-induced drift.
• Thermal expansion and nonradiative relaxation distort luminescence, affecting accuracy.

Purpose of the Study:

• To develop a thermally invariant optical manometry technique.
• To decouple pressure and temperature effects for reliable sensing.

Main Methods:

• A spectro-temporal ratiometric approach combining spectral and time-gated luminescence.
• Utilizing a rigid-lattice host (Y3In2Ga3O12:Cr3+) to minimize thermal sensitivity.
• Employing ratiometric detection to stabilize pressure sensitivity.

Main Results:

• Achieved high thermal-invariance manometric factors (TIMF) of ~7700 K·GPa⁻¹ (spectral) and ~2500 K·GPa⁻¹ (time-gated).
• Demonstrated pressure sensitivity (S_R,p) up to 51%·GPa⁻¹, exceeding ruby benchmarks by two orders of magnitude.
• Outperformed conventional lifetime analysis by ~40 times.

Conclusions:

• The developed method enables accurate, self-referenced optical pressure mapping under extreme thermo-mechanical conditions.
• Provides a quantitative framework for thermally reliable sensing in coupled fields.
• Advances luminescent manometry beyond empirical calibration.