Sub-picosecond ballistic imaging of a liquid jet |
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| Authors: | Sa?d Idlahcen Claude Rozé Lo?c Méès Thierry Girasole Jean-Bernard Blaisot |
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| Institution: | (1) UMR 6614-CORIA, CNRS, Universit? et INSA de Rouen, BP12, Avenue de l’Universit?, 76801 Saint-?tienne du Rouvray Cedex, France;(2) CNRS, UMR 5509 LMFA, ?cole centrale de Lyon, 36 avenue Guy-de-Collongue, 69134 ?cully Cedex, France; |
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| 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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