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NIST Emberometer
Emberometer deployed during a prescribed fire experiment.
The Emberometer (video) is a camera-based system designed to study the motion of embers as they move through the air. It uses a technique called 3D Particle Tracking Velocimetry (3D-PTV) to track embers in three dimensions over time. This system can measure an ember 3D flux, i.e. how many embers pass through a certain area in a given time, a quantity valuable for comparing exposures. The system is also used to study the detailed motion of embers as they are about to land and settle, which may vary depending on the wind strength, nearby obstacles, etc.
NIST Emberometers are currently being deployed during large-scale controlled fires to document ember exposures in various test conditions.