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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings

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High-speed two-camera imaging pyrometer for mapping fireball temperatures.

John M Densmore¹, Barrie E Homan, Matthew M Biss

¹Lawrence Livermore National Laboratory, California 94550, USA. densmore3@llnl.gov

|November 24, 2011

Summary

A novel high-speed imaging pyrometer was developed for analyzing flames and explosions. This instrument successfully measured temperatures of exploded TNT charges, offering insights into explosive event dynamics.

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Area of Science:

Optics and Photonics
Combustion Science
Explosives Engineering

Background:

Investigating high-temperature phenomena like flames and explosions requires advanced diagnostic tools.
Existing methods may have limitations in temporal and spatial resolution for dynamic events.

Purpose of the Study:

To develop and validate a high-speed imaging pyrometer for studying flames and explosive events.
To measure the temperature of detonating TNT charges using the developed instrument.

Main Methods:

Utilized two high-speed Phantom v7.3 m cameras with a shared lens assembly.
Employed narrow bandpass filters (700 or 900 nm) to capture blackbody emission.
Optimized camera settings (shutter time, f-stop) for high irradiance conditions.

Main Results:

Successfully captured images of explosive events with appropriate exposure.
Demonstrated the capability to measure temperatures of exploded TNT charges.
Wavelength selection minimized interference from gas phase emissions.

Conclusions:

The developed high-speed imaging pyrometer is effective for temperature measurements in dynamic combustion and explosion scenarios.
The instrument provides valuable data for understanding the behavior of explosive events.