15 February 1993 Application of off-axis holography to spray investigations: aberration minimization and size determination
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A holographic measurement system was used for the investigation of droplet size, density and velocity in the injection spray of a model diesel engine. The model engine consisted of a conventional injection pump and a test chamber that could be operated at high pressure and temperature to simulate the conditions in an operating diesel engine. The use of off-axis holography with a laser light sheet from a pulsed ruby laser helped to increase the maximum droplet density in the spray that could be resolved. Chromatic aberrations, introduced by the reconstruction of the holograms with a wavelength different from the recording wavelength, were minimized by careful choice of recording and reconstruction geometry. A new method for size determination was devised. The reconstructed images were recorded with a CCD camera and analyzed with the help of a personal computer. Software for automatic detection of 3-D particle position and velocity determination was developed.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Johannes K. Schaller, Johannes K. Schaller, Andreas Ante, Andreas Ante, Thilo Theisen, Thilo Theisen, Christo G. Stojanoff, Christo G. Stojanoff, } "Application of off-axis holography to spray investigations: aberration minimization and size determination", Proc. SPIE 1756, Interferometry: Applications, (15 February 1993); doi: 10.1117/12.140809; https://doi.org/10.1117/12.140809

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