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Summary

This study introduces a novel spectroradiometry system for precise temperature measurements in high-pressure experiments. The new system achieves high accuracy and precision at temperatures below 3000 K.

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Area of Science:

High-pressure physics
Materials science
Spectroradiometry

Background:

Accurate temperature measurements are vital for high-pressure experiments using diamond anvil cells or shock waves.
Sub-millisecond timescale experiments necessitate specialized detectors like streak cameras or photomultiplier tubes.
Achieving high accuracy and precision, particularly below 3000 K, remains challenging.

Purpose of the Study:

To develop and present a new spectroradiometry system for enhanced temperature measurement.
To improve accuracy and precision in high-pressure, short-timescale experiments.
To enable reliable temperature diagnostics below 3000 K.

Main Methods:

Utilized multianode photomultiplier tube technology with passive readout circuitry.
Implemented a five-color spectroradiometry approach for temperature determination.
Conducted high-pressure pulsed Joule heating experiments in a diamond anvil cell.

Main Results:

Achieved a 0.24 µs rise-time per channel.
Demonstrated measurement precision of ±30 K at 2000 K with 0.6 µs time-resolution.
Indicated an accuracy of ±80 K in the 1800-2700 K range during ambient pressure tests.

Conclusions:

The developed spectroradiometry system offers significant improvements in precision and accuracy for high-pressure experiments.
The system is particularly effective for measurements below 3000 K and at sub-millisecond timescales.
This advancement facilitates more reliable data acquisition in dynamic high-pressure research.