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SLIPI is an established technique in planar laser imaging to remove imaging artefacts arising from higher order scattering in 2-phase fluids, such as sprays. Multiple light scattering generates misleading results, especially when applied to 2-color ratio metric methods like LIF/Mie. Using SLIPI instead, the quality of results from planar spray imaging is drastically improved. It reduces multiple light scattering applying laser imaging in dense sprays. SLIPI is based on spatially modulated laser light sheets for Mie or LIF imaging. While multiply scattered light loses the modulation information, it is maintained for singly scattered light. When the stripe-like phase shifted images are combined correctly, the resulting SLIPI image shows higher image contrast and reveals inner spray structures, which are hidden when using conventional planar laser imaging.
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The SLIPI Optics Module works as an Add-on to an existing laser imaging system. It will be applied to the laser beam, at the position of the sheet optics. The output is a spatially modulated laser sheet.
Three different approaches for SLIPI are available, depending on the application:
- 1p-SLIPI works with a single laser shot and a fixed pattern modulated light sheet for highest temporal resolution and a minimum of technical effort.
- 2p-SLIPI makes use of dual-cavity lasers to achieve an optimum spatial resolution instantaneously.
- 3p-SLIPI is based on phase scans and the best choice for time averaged applications like planar droplet sizing (LIF/Mie).
