These are taken with the line laser to create a slit scan of water as it flows down the rollers on the Cherwell at Mesopotania. The laser allows for a higher time resolution than video slit scan. although it looks very much like a frozen frame of running water, it’s actually a scan of water as it passes.

Laser fringes on left:

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Water droplets are ‘scanned’ as they pass through the beam:
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This is closer to what it looks like – the image is oversaturated monochromatic red so I’ve used false colour to make it more water like.
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Ronnie was having fun!
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