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Reliable measurement of droplet/bubble size and velocity distributions indense flows is desired in a variety of research fields, both for laboratory andindustrial use. A new type of single-mode monofiber optical probe manufacturedby A2 Photonic Sensors is introduced in this paper: it combines traditionalphase detection with the collection of a Doppler signal returned by an incominggas-liquid interface to provide information on residence times, dropconcentration and velocity, which afford then drop chords and liquid fluxmeasurements. Compared with classical optical probes, that new sensor does notrequire any calibration. The purpose of the present work is to test thistechnique in assisted atomization in order to provide a mean for spraycharacterization and ultimately to improve our understanding of atomizationmechanisms. The probe has been tested downstream of a coaxial air-assistedatomizer operated at liquid velocity =. to. / , and gas velocity from = toabout /. We first analyzed raw signals in various flow conditions. It happensthat, when increasing the gas velocity and the number density of drops, thesignal experiences very strong fluctuations of the gas level, making theidentification of individual droplets more difficult. That leads us to developa new signal processing routine specifically adapted to such complex workingconditions. At = / and for three liquid flow rates, the spatial integration oflocal liquid fluxes represents 92 to 99% of the injected liquid flow rate.These good results demonstrate that the Doppler probe provides reliablestatistics on drops velocity and size.

Monofiber optical probe using Doppler signals detection for Drop Size and Velocity measurement in air assisted atomization