Multi-frame multi-exposure shock wave imaging and pressure measurements

Mur, Jaka (author), Reuter, Fabian (author), Kočica, Jernej Jan (author), Lokar, Žiga (author), Petelin, Jaka (author), Agrež, Vid (author), Ohl, Claus-Dieter (author), Petkovšek, Rok (author)

Shock wave visual detection was traditionally performed using streak cameras, limited to homogeneous shock wave emission, with the corresponding shock wave pressure measurements available at rather large distances or numerically estimated through equation of state for water. We demonstrate a multi-frame multi-exposure shock wave velocity measurement technique for all in-plane directions of propagation, based on custom-built illumination system allowing multiple illumination pulses within each frame at multi-MHz frame rates and at up to 200 MHz illumination pulse repetition frequency at sub-nanosecond pulse durations. The measurements are combined and verified using a fiber-optic probe hydrophone, providing independent shock wave pressure and time-of-flight measurements, creating a novel all-optical measurement setup. The measured pressures at distances around 100 µm from the plasma center exceed 500 MPa, while camera-based measurements at even shorter distances indicate pressures above 1 GPa.

• Language: English
• Keywords: cavitation, laser breakdown, shock wave, laser illumination, fiber-optic hydrophone
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2022
• Number of pages: Str. 37664-37674
• Numbering: Vol. 30, no. 21, art. 470695
• PID: 20.500.12556/RUL-141334
• UDC: 621.9.048.7
• ISSN on article: 1094-4087
• DOI: 10.1364/OE.470695
• COBISS.SI-ID: 123292163

Copyright

“© 2022 Optica Publishing Group under the terms of the Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.” (Datum opombe: 12. 6. 2023)

• Publication date in RUL: 28.09.2022

Record is a part of a journal

• Title: Optics express
• Shortened title: Opt. express
• Publisher: Optica
• ISSN: 1094-4087
• COBISS.SI-ID: 8636438

Secondary language

• Language: Slovenian
• Keywords: kavitacija, laserski preboj, udarni val, lasersko osvetljevanje, vlakenski merilnik tlaka