Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
This paper presents a contactless, acoustic technique to manipulate and sort particles of varying size in both liquid and air media. An acoustic standing wave is generated by the superposition of counterpropagating waves emitted by two opposing emitters. The acoustic radiation force traps the smallest particles at the pressure nodes of the acoustic standing wave. The position of the particles can be manipulated by dynamically changing the phase difference between the two emitters. By applying a dynamic acoustic field (DAF), it is demonstrated that particles can be manipulated spatially and sorted according to size. The discrimination (sorting dynamic range) capability is initially demonstrated in liquid media by separating three different sets of polystyrene particles, ranging in size from 5 to 45μm in diameter. The separation between particles was performed up to a ratio of 5/6 in diameter (20% diameter difference). Finally, the scalability of the DAF method is demonstrated by sorting expanded polystyrene particles of 2 and 5 mm diameter in air.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1109/TUFFC.2016.2608759 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
High-Precision Contactless Stereo Acoustic Monitoring in Polysomnographic Studies of Children.
Sensors (Basel)
August 2025
Department of Electromagnetic and Biomedical Engineering, Faculty of Electrical Engineering and Information Technology, University of Zilina, Univerzitna 8215/1, 010 26 Zilina, Slovakia.
This paper focuses on designing a robust stereophonic measurement set-up for sound sleep recording. The system is employed throughout the night during polysomnographic examinations of children in a pediatric sleep laboratory at a university hospital. Deep learning methods were used to classify the sounds in the recordings into four categories (snoring, breathing, silence, and other sounds).
View Article and Find Full Text PDFMedical Data over Sound-CardiaWhisper Concept.
Sensors (Basel)
July 2025
Cybernetics & Decision Support Systems Laboratory, Faculty of Organizational Sciences, University of Maribor, Kidričeva cesta 55a, 4000 Kranj, Slovenia.
Data over sound (DoS) is an established technique that has experienced a resurgence in recent years, finding applications in areas such as contactless payments, device pairing, authentication, presence detection, toys, and offline data transfer. This study introduces CardiaWhisper, a system that extends the DoS concept to the medical domain by using a medical data-over-sound (MDoS) framework. CardiaWhisper integrates wearable biomedical sensors with home care systems, edge or IoT gateways, and telemedical networks or cloud platforms.
View Article and Find Full Text PDFHolographic vibrometry is a family of interferometric methods for contactless, full-field vibration measurements. Harmonic surface vibrations with high frequencies (hertz to upper megahertz regime) and low displacements (sub-nanometer to micrometer) as found in micro-electromechanical systems can be characterized. Using frequency shifting, it is possible to obtain static interference or low-frequency beats between the reference arm and one of the sidebands generated by the vibration in the object arm.
View Article and Find Full Text PDFAcoustically Levitated Sample Introduction for GC-MS: A Novel Contactless Approach to Direct Volatile Analysis.
Rapid Commun Mass Spectrom
November 2025
Yıldız Technical University, Department of Chemistry, İstanbul, Turkey.
Conventional GC-MS sample introduction methods often involve physical contact, increasing contamination risk and analyte degradation, especially in sensitive matrices. This study introduces a novel, contactless interface using standing-wave acoustic levitation to suspend analytes in mid-air prior to GC-MS analysis. A 28 kHz ultrasonic transducer, powered by a high-voltage amplifier, generates stable levitation nodes inside a custom chamber, enabling droplets and solid particles to remain airborne during volatilization.
View Article and Find Full Text PDFMagnetoelastic softening in cold-sprayed polycrystalline nickel studied by resonant ultrasound spectroscopy.
J Acoust Soc Am
July 2025
Institute of Thermomechanics, Czech Academy of Sciences, Dolejškova 5, 182 00 Prague 8, Czechia.
Cold-sprayed metallic deposits are additively manufactured materials containing high levels of compressive residual stress. Here, we show that the presence and intensity of this stress can be analyzed using laser-ultrasonics, provided that the sprayed material is ferromagnetic and magnetostrictive, as in the case of pure nickel. Contactless resonant ultrasound spectroscopy is used to monitor the evolution of shear modulus and internal friction parameter of two polycrystalline Ni deposits with temperature over the Curie point, which enables a direct assessment of the strength of magnetoelastic softening that is known to be strongly stress-dependent.
View Article and Find Full Text PDF