Cavitation detection in machinery

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SUMMARY

The latest techniques for measuring cavitation in pumps and turbines include acoustic detection using hydrophones and signal processing to analyze cavitation noise spectra. Optical detection methods are also effective, particularly when the fluid contains specific dissolved gases that emit picosecond flashes at certain wavelengths during bubble collapse. These flashes can be captured using a reverse-biased photodiode connected to a transimpedance amplifier. Additionally, literature resources are available for further exploration of these methods.

PREREQUISITES
  • Understanding of hydrophone technology and acoustic signal processing
  • Familiarity with optical detection methods and photodiode operation
  • Knowledge of cavitation phenomena in fluid dynamics
  • Experience with transimpedance amplifiers and their applications
NEXT STEPS
  • Research the use of hydrophones for cavitation detection in fluid systems
  • Explore the principles of optical detection in cavitation measurement
  • Investigate the role of dissolved gases in cavitation and their detection
  • Study the design and application of transimpedance amplifiers in signal processing
USEFUL FOR

Engineers, researchers, and technicians involved in fluid dynamics, pump and turbine design, and cavitation analysis will benefit from this discussion.

ajd12
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Hi,

Can someone please give me an insight as to what the latest techniques used to measure the cavitation on blades of pumps/turbines are? Are the any radio-isotope spectral methods to detect erosion/pitting? is sonoluminescence even observed in high speed machinery? Any other methods/ suggestions/links to sources are appreciated

Thank you
 
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The onset of cavitation can be detected acoustically using a hydrophone and signal processing that compares the signal to known cavitation noise spectra.

In some conditions, cavitation may be detected optically. If the fluid contains certain species of dissolved gasses picosecond flashes at specific optical wavelengths will be emitted by the collapsing bubbles. This light can be detected using a reverse-biased photodiode coupled to a transimpedance amplifier.
 

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