Spatio-temporal analysis of a liquid jet using a sub-picosecond optical gate
Résumé
A Diesel jet visualization based on an ultra-short light pulse and a time-resolved detection is proposed. An optical gate, consisting of a BBO (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.
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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