Flow Diagnostics >> Lavision

Laser-Induced Incandescence (LII) Imaging

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    LII imaging is applied using intense laser light sheet illumination slicing the (reactive) particle flow at user defined locations.

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      The particles within the light sheet are heated up to the carbon evaporation temperature (> 4000K). The resultant incandescence (blackbody emission) of the heated particles is detected with a fast shutter camera synchronized to the laser pulse. Appropriate filtering and time-gating of the LII emission assure accurate soot volume fraction measurements. Primary particle size distributions can be derived from LII signal ratios. LII signal calibration is carried out in combination with reference sources of known particle concentrations or in combination with extinction measurements.