A multi-wavelength streaked optical pyrometer for dynamic shock compression measurements above 2500 K

Area of Science:

• High-pressure physics
• Materials science
• Optical diagnostics

Background:

• Dynamic shock experiments require precise temperature measurements.
• Existing pyrometry methods may have limitations in accuracy and reliability.
• Z-cut quartz is a common material for shock Hugoniot studies.

Purpose of the Study:

• To present the concept and implementation of a calibrated streaked spectral pyrometer (SSP) for shock experiments.
• To validate the performance of the SSP diagnostic against known temperature data.
• To improve the accuracy and confidence in temperature measurements during dynamic shock events.

Main Methods:

• Utilized a two-stage gas gun for dynamic shock experiments.
• Employed a calibrated streaked spectral pyrometer (SSP) system.
• Incorporated a tunable monochromator and a NIST-traceable calibrated power meter.
• Performed measurements on shock-driven z-cut quartz at 99 GPa and 93 GPa.

Main Results:

• The SSP diagnostic demonstrated agreement with literature values within 5%.
• Multiple SSP systems per sample provided independent measurements.
• The system successfully measured temperatures in dynamically driven shock experiments.

Conclusions:

• The calibrated SSP is a reliable and accurate temperature diagnostic for shock experiments.
• The use of multiple SSP systems increases confidence in temperature measurements.
• This diagnostic advances the field of high-pressure shock physics research.