Evaluation of a novel mid-infrared pyrometer for dynamic material experiments

Area of Science:

• Thermodynamics
• Material Science
• Optical Engineering

Background:

• Measuring temperature in dynamic compression experiments is challenging.
• Optical pyrometry typically uses visible or Near-Infrared (NIR) spectra, effective above 1200-1500 K.
• Low-temperature (<1200 K) dynamic material experiments require Mid-Infrared (Mid-IR) for accurate measurements.

Purpose of the Study:

• Design, test, and characterize a novel Mid-IR pyrometer system.
• Enable high-fidelity temperature measurements in low-temperature dynamic compression experiments.
• Improve precision for both low and high-temperature measurements.

Main Methods:

• Developed a novel Mid-IR pyrometer system.
• Configured the pyrometer to operate between 2.5 and 5.0 µm.
• Validated the system on gas gun platforms with varying impact velocities.

Main Results:

• Successfully measured temperatures between 450 K and 1100 K.
• Demonstrated the system's suitability for low-temperature dynamic material experiments.
• Validated the pyrometer's performance on two distinct experimental platforms.

Conclusions:

• The novel Mid-IR pyrometer system provides high-fidelity temperature measurements for dynamic compression experiments, especially below 1200 K.
• This technology expands the capabilities for studying material behavior under various thermodynamic conditions.
• The system enhances the precision and accuracy of temperature measurements across a wide range.