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Laser Induced Incandescence - LII

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

LaVision was founded in 1989 as a spin-off from Max Planck Institute and Laser Laboratory in Goettingen, Germany.

LaVision offers standard and dedicated customer designed Laser Imaging Systems for reactive and non-reactive flow field analysis and fluid mechanics applications, Intelligent Imaging Systems for non-destructive material testing, a range of high-performance cameras (CCDs and intensified CCDs) and smart optical sensor systems.

The LaVision team has extensive professional experience in Laser Imaging Spectroscopy and optical techniques such as Laser Induced Fluorescence (LIF), Absorption and Emission Spectroscopy, Raman, Rayleigh and Mie Scattering, Particle Image Velocimetry (PIV), Spray Analysis, Digital Image Correlation (DIC) techniques as well as ultra-fast time-resolved imaging and high-speed image recording.


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


Soot imaging & analysis based on LII

LII is orders of magnitude more sensitive than standard gravimetric particle sampling techniques allowing the detection of ultra low particle emissions of modern car engines even under transient conditions.


Applications:

in-situ and real time characterization of soot emission in diesel and direct injection spark ignition engines, gasturbines, flames and various kinds of metal or ceramics

particle flows

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