An Ultrasonic Levitator

Boullosa, Ricardo R.; Pérez-López, Antonio; Dorantes-Escamilla, R.

doi:10.1016/s1665-6423(13)71592-x

Cited by 9 publications

(3 citation statements)

References 11 publications

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“…However, it has been discovered that the use of concave surfaces enables the axial and radial stresses on the levitated items to be greatly increased [95], [103], [116]. Due to this, many single-axis levitators [86], [95], [96], [105], [117], [118] or [103], [116], [119] are made of a plane transducer and a concave reflector, or both. The employment of reflectors with peculiar properties has also been documented in the literature [120], [121], [122] in addition to levitators using concave and flat surfaces.…”

Section: A Standing Wave Methodsmentioning

confidence: 99%

A Non-Contact Manipulation for Robotic Applications: A Review on Acoustic Levitation

2022

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Robots play an important role all over the world in the industrial field in terms of dealing with various materials, performing duties quickly and high accuracy as well as in the pharmaceutical/chemical field since robots can handle some issues better than human. Robotic manipulation is the term used to describe how robots deal with many objects. This article reviews the contact and non-contact manipulation with their most common robotic applications and focusing on the non-contact manipulation since it can do specific tasks which contact manipulation cannot do. Reviewing of the robotic non-contact manipulation which include the metal-based robotic manipulation such as magnetic and electrostatic levitation and the non-metal-based robotic manipulation method such as aerodynamic and acoustic levitation have been made in this article. The main core of this article is acoustic levitation which considered one of the most important levitation and manipulation method due to the recent advancements that made it proper to deal with any kind of materials. Here, we review the renowned three methods of acoustic levitation that already using in robotic non-contact manipulation which are standing wave, near-field and single-beam acoustic levitation. Then, we present a performance characteristic of the reviewed methods and the summary of controlling strategies, followed by conclusion and future recommendations for acoustic levitation methods as a non-contact manipulation.

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Section: A Standing Wave Methodsmentioning

confidence: 99%

A Non-Contact Manipulation for Robotic Applications: A Review on Acoustic Levitation

2022

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“…Recently, sample manipulation using acoustic levitation has been highly expected, but it has not yet been realized. To realize it, it is strongly expected to obtain the flow structure inside and outside of the droplet with variety of parameters precisely, however, measurement issues like non-linearities and large curvature distorted internal flow of an acoustically levitated droplet still remain due to light refraction at the droplet surface (Boullosa et al, 2013). For this purpose, the visualization and reduction of internal flow distorted particle images in a levitated droplet using the calibration method is expected to develop container-less processing techniques in industrial applications.…”

Section: Improvement Of the Accuracy Of Piv Measurement Of Flow Field...mentioning

confidence: 99%

Improvement of the accuracy of PIV measurement of flow field in a levitated droplet

GATETE,

SHEN,

KANEKO

2024

Mechanical Engineering Journal

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The use of levitated droplets with electrostatic and ultrasonic fields has attracted much attention in the fields of materials development, chemical engineering, droplet-based microfluidics, inkjet printing, and aerospace engineering. To use them properly, it is essential to understand the internal flow of the suspended droplet. The flow inside fluid droplets is visualized with the particle image velocimetry (PIV) method. The fluid that is to be investigated is scattered with small particles that follow the flow well. One problem that occurs when the PIV method is used to measure velocity fields inside droplets is however that light refracts at the droplet surface and the internal flow curvature is distorted. The aim of this research is to improve the accuracy of PIV measurement by correcting the distorted particle images of an acoustically levitated droplet using calibration method. In this study, a simulated droplet with different refractive index and aspect ratio was used to investigate their influence on distortion correction. The circular target plate was also utilized to correct the distortion in a simulated droplet using a calibration method of the python-OpenCV. The experimental results showed that the internal flow curvature can be distorted in two types such as barrel, pincushion distortions, and increase as the refractive index increases. Therefore, correction of the distorted image of particles in the droplet showed good convergence as the aspect ratio decreased.

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“…An important feature of the Aclev systems, contrasting with other levitation techniques such as magnetic, electric, aerodynamic, optical or radiofrequency, is stability. Since objects can be stably levitated, many experiments have been developed in recent years, with applications ranging from analytical chemistry to holographic images generation, micromanipulation of submilimetric components, containerless object manipulation, and many others [6,7,22,28,31,35,38].…”

Section: Introductionmentioning

confidence: 99%

Saddle-Node Bifurcations and Design Parameters for Single-Axis Acoustic Levitators

2020

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Acoustic levitation (Aclev) is an important tool to noncontact handling of containerless objects. In the recent years, many devices have been successfully developed due to the stable behavior of the Aclev devices. As a result, most of the works on Aclev concentrate on numerical simulations or experimental tests to study the geometry and arrangements of the acoustic emitters, or the influence of various types of perturbations, and most of the mathematical models consider only the acoustic potential. In this work, the nonlinear equation of motion for a levitated particle immersed in a single-axis acoustic field is developed considering dissipative forces. The parameter space is searched for the existence of equilibrium points bifurcations, and a design range for the Aclev device gains is determined from the equilibrium point existence condition, providing hints in order to improve the stability gain margin and, consequently, the robustness to perturbations. In addition, the dynamical behavior of the Aclev device concerning the gains is studied considering also the micro-gravity situation. Numerical simulations corroborate the analytical results.

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An Ultrasonic Levitator

Cited by 9 publications

References 11 publications

A Non-Contact Manipulation for Robotic Applications: A Review on Acoustic Levitation

A Non-Contact Manipulation for Robotic Applications: A Review on Acoustic Levitation

Improvement of the accuracy of PIV measurement of flow field in a levitated droplet

Saddle-Node Bifurcations and Design Parameters for Single-Axis Acoustic Levitators

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