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In this work, we extend a planar laser-induced fluorescence method for free surface measurements to a three-dimensional domain using a stereo-camera system, a scanning light sheet, and a modified self-calibration procedure. The stereo-camera set-up enables a versatile measurement domain with self-calibration, improved accuracy, and redundancy (e.g., possibility to overcome occlusions). Fluid properties are not significantly altered by the fluorescent dye, which results in a non-intrusive measurement technique. The technique is validated by determining the free surface of a hydraulic flow over an obstacle and circular waves generated after droplet impact. Free surface waves can be accurately determined over a height of $$L=100$$ mm in a large two-dimensional domain ($$y(x,z) = 120\times 62$$ mm$$^2$$), with sufficient accuracy to determine small amplitude variations ($$\eta \approx 0.2$$ mm). The temporal resolution ($${\varDelta }t = 19$$ ms) is only limited by the available scanning equipment ($$f = 1$$ kHz rate). For other applications, this domain can be scaled as needed.

Scanning stereo-PLIF method for free surface measurements in large 3D domains