Open AccessMulti-frame multi-exposure shock wave imaging and pressure measurements
Author(s) -
Jaka Mur,
Fabian Reuter,
Jernej Jan Kočica,
Žiga Lokar,
Jaka Petelin,
Vid Agrež,
ClausDieter Ohl,
Rok Petkovšek
Publication year - 2022
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.470695
Subject(s) - optics , streak camera , shock wave , shock (circulatory) , hydrophone , physics , streak , acoustics , materials science , laser , medicine , thermodynamics
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.