Passive Cavitation Detection
Passive Cavitation Detection - Related Videos
14:22
Activating Molecules, Ions, and Solid Particles with Acoustic Cavitation
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Cited by 6 •
2014
Acoustic cavitation in liquids submitted to power ultrasound creates transient extreme conditions inside the collapsing bubbles, which are the origin of unusual chemical reactivity and light emission, known as sonoluminescence. In the presence of noble gases, nonequilibrium plasma is formed. The "hot" particles and the photons generated by collapsing bubbles are able to excite species in solution.
09:15
Light Enhanced Hydrofluoric Acid Passivation: A Sensitive Technique for Detecting Bulk Silicon Defects
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Cited by 6 •
2016
A RT liquid surface passivation technique to investigate the recombination activity of bulk silicon defects is described. For the technique to be successful, three critical steps are required: (i) chemical cleaning and etching of silicon, (ii) immersion of silicon in 15% hydrofluoric acid and (iii) illumination for 1 min.
11:14
A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level
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Cited by 8 •
2017
A microfluidic chip was fabricated to produce pairs of gold dots for tandem bubble generation and fibronectin-coated islands for single-cell patterning nearby. The resultant flow field was characterized by particle image velocimetry and was employed to study various bioeffects, including cell membrane poration, membrane deformation, and intracellular calcium response.
08:24
Nitrogen Cavitation and Differential Centrifugation Allows for Monitoring the Distribution of Peripheral Membrane Proteins in Cultured Cells
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Cited by 15 •
2017
Here we present protocols for detergent-free homogenization of cultured mammalian cells based on nitrogen cavitation and subsequent separation of cytosolic and membrane-bound proteins by ultracentrifugation. This method is ideal for monitoring the partitioning of peripheral membrane proteins between soluble and membrane fractions.
10:34
Characterization and Application of Passive Samplers for Monitoring of Pesticides in Water
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Cited by 6 •
2016
A protocol about the characterization and application of five different passive sampling devices is presented.
FAQs
Spectral and time-domain analyses provide complementary views of acoustic emissions. Spectral analysis organizes recorded signals by frequency, whereas time-domain analysis follows how those signals change during operation. Comparing both representations helps identify whether activity is more consistent with stable or inertial cavitation, enabling engineers to characterize behavior and monitor changes without adding an acoustic transmission step.
Hydrophones and other acoustic sensors provide the listening channel for pressure waves generated during cavitation. Their role is observational: Passive Cavitation Detection records produced emissions instead of transmitting an additional monitoring signal. This noninvasive arrangement supports evaluation of operating systems while avoiding a measurement step that could itself introduce acoustic excitation.
Changes in acoustic emissions provide a way to follow cavitation activity as an engineering system operates. Time-domain measurements show when signal behavior changes, while spectral analysis helps characterize those changes. This information can support real-time process monitoring, reveal shifts in operating behavior, and guide decisions about system optimization or safety assessment.
A basic workflow uses a hydrophone or another acoustic sensor to listen while the target system operates. The resulting emissions are then examined in both spectral and time-domain representations. Engineers can compare the observed signal behavior with stable or inertial cavitation patterns and track how activity changes during processing or equipment operation.
The approach can be applied to ultrasonic cleaning, sonochemical reactors, biomedical ultrasound equipment, and hydraulic machinery. In these settings, cavitation may support processing or may contribute to erosion, noise, and performance loss. Passive measurements provide a noninvasive way to evaluate activity across these different systems without adding a transmitted monitoring signal.
Acoustic measurements can help engineers optimize systems by tracking cavitation activity during operation and assessing whether behavior changes over time. They also support safety assessment where cavitation may contribute to erosion, noise, or performance loss. In process-oriented applications, the same information can contribute to real-time monitoring of ultrasonic or sonochemical equipment.