Abstract
A diesel jet visualisation based on an ultra-short light pulse and a time-resolved detection is proposed. An optical gate, consisting of a beta barium borate crystal, allows to separate ballistic, refractive and scattered light. An imaging pulse passes through the studied medium, while a gating pulse is used to open the gate. With this configuration, a spatial resolution of 10 μm and a temporal resolution of 270 fs are obtained. The gate duration is compatible with the typical dimensions of a liquid jet generated by a commercial automotive fuel injector. Preliminary results show that spatio-temporal diagrams of transmitted light through a spray may be acquired, showing clearly the separation between ballistic, refracted and scattered light.
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Idlahcen, S., Rozé, C., Méès, L. et al. Sub-picosecond ballistic imaging of a liquid jet. Exp Fluids 52, 289–298 (2012). https://doi.org/10.1007/s00348-011-1220-1
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DOI: https://doi.org/10.1007/s00348-011-1220-1