Application of Laser Techniques in Rain Impact and Erosion Investigations

Daniel J. Novak

doi:10.1117/12.7972345

Abstract

A laboratory photographic system employing a giant pulsed ruby laser as a light source was adapted to field use in recording erosion and rain impact phenomena on controlled rain-erosion testing at the Holloman High Speed Test Track facility. Techniques using the short-time duration of 20 nanoseconds to effectively stop the sled motion of specimens traversing a rain environment at speeds in excess of 1.8 km/sec are described. A front/back light method for recording erosion detail, flow visualization and shadowgraph information with a single laser as the light source for multiple cameras is presented. Photographs of rain drops impacting on sled specimens are shown along with a comparison with conventional photographic techniques. The advantages of employing the single laser with multiple cameras discussed in this paper demonstrate its applicability to the diverse problems of recording erosion, abla-tion and aerodynamic data of test specimens traveling at hypersonic speeds.

Citation Download Citation

Daniel J. Novak, "Application of Laser Techniques in Rain Impact and Erosion Investigations," Optical Engineering 18(2), 182173 (1 April 1979). https://doi.org/10.1117/12.7972345 . Submission:

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