On fiber optic probe hydrophone measurements in a cavitating liquid.
The measurement of high-pressure signals is often hampered by cavitation activity. The usage of a fiber optic probe hydrophone possesses advantages over other hydrophones, yet when measuring in a cavitating liquid large variations in the signal amplitude are found; in particular when the pressure signal recovers back to positive values. With shadowgraphy the wave propagation and cavity dynamics are imaged and the important contributions of secondary shock waves emitted from collapsing cavitation bubbles are revealed. Interestingly, just adding a small amount of acidic acid reduces the cavitation activity to a large extent. With this treatment an altered primary pressure profile which does not force the cavitation bubbles close to fiber tip into collapse has been found. Thereby, the shot-to-shot variations are greatly reduced.
Zijlstra
Aaldert
A
Faculty of Science, Physics of Fluids, University of Twente, 7500 AE Enschede, The Netherlands.
Ohl
Claus Dieter
CD
D000162:Acoustics / Q000295:instrumentation; D004867:Equipment Design; D005336:Fiber Optic Technology; D006801:Humans; D055100:Optical Fibers; D011571:Psychoacoustics; D014867:Water
D014867:Water