Simulating Acoustic Orientation Trapping for Stable Levitation

Helander, P.; Haggstrom, Edward; Puranen, Tuomas; Meriläinen, Antti; Maconi, Göran; Penttilä, Antti; Gritsevich, Maria; Kassamakov, Ivan; Salmi, Ari; Muinonen, K.

doi:10.1109/ultsym.2019.8925843

Cited by 2 publications

(4 citation statements)

References 8 publications

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“…the yaw is ten times stiffer than the roll and pitch. The stiffness ratio between the axes can be changed by altering the field asymmetry [33]. The harmonic force yields theoretically a resonant frequency of 23 Hz for the control samples against the largest moment of inertia, which matches the 20 Hz oscillations observed experimentally.…”

supporting

confidence: 75%

Omnidirectional microscopy by ultrasonic sample control

Helander

Puranen

Meriläinen³

et al. 2020

Applied Physics Letters

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Omnidirectional microscopy (OM) is an emerging technology capable of enhancing the threedimensional (3D) microscopy widely applied in life sciences. In OM, precise position and orientation control of the sample are required. However, current OM technology relies on destructive, mechanical methods to hold the samples, such as embedding samples in gel or attaching them to a needle to permit orientation control. A non-contacting alternative is to levitate the sample. Up until now levitation methods have lacked orientation control. We enable omnidirectional access to the sample by introducing a method to control acoustic levitation that provides precise orientation control. Such control around three axes of rotation permits rapid imaging of the sample from any direction with a fixed camera and subsequent 3D shape reconstruction. The control of non-spherical particles is achieved using an asymmetric acoustic field created with a phase-controlled transducer array. Our technology allows robust 3D imaging of delicate samples and their study in a time-lapse manner. We foresee that the described method is not limited to microscopy and optical imaging, but is also compatible with automated sample handling, light-sheet microscopy, wall-less chemistry, and non-contacting tomography.

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supporting

confidence: 75%

Omnidirectional microscopy by ultrasonic sample control

Helander

Puranen

Meriläinen³

et al. 2020

Applied Physics Letters

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“…A singular value decomposition (SVD) based method was previously developed to optimize the levitation field to achieve orientation control of ellipsoidal objects [5]. The field is created by setting zero pressure at the desired levitation location and by aligning the pressure gradients along the z-axis and x-axis with different amplitudes, resulting in an asymmetric acoustic trap.…”

Section: B Optimization Algorithmsmentioning

confidence: 99%

“…We previously presented a custom-built PAT levitator [4], as well as a simulation model for calculating the forces and torques experienced by an arbitrarily shaped object in a levitator field [5]. However, the simulation model only computes the static forces and torques acting on the object, and has no time dependent dynamics included.…”

Section: Introductionmentioning

confidence: 99%

“…Levitation dynamics have earlier been studied with the finite element method (FEM) in water [6]. We now propose a boundary element method (BEM) model for computing the acoustic field, based on [5], while using FEM for the object dynamics. The simulation model uses results from field optimization algorithms as an input to create the levitation fields.…”

Section: Introductionmentioning

confidence: 99%

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BEM-FEM Simulation of Acoustic Levitation Dynamics with Phased Arrays

Sirkka

Mäkinen

Tommiska

et al. 2022

2022 IEEE International Ultrasonics Symposium (IUS)

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We present a simulation model that can be used to study the movement of an object in an acoustic levitator. The model uses the boundary element method (BEM) to compute the levitator's acoustic field, and the finite element method (FEM) to compute the movement of the levitating object.The model was built to act as a virtual tool for testing how objects move in acoustic pressure fields generated by phased array transducers (PATs). This was demonstrated by comparing object dynamics for different PAT optimization methods. We studied the stability of the levitation in fields created by two optimization methods. The fields were optimized to levitate an ellipsoid in the middle of our PAT geometry. By slightly displacing the levitating object from the intended levitation spot, we were able to show that the levitation became unstable and that the object would drop out from the trap.The results demonstrate that the model can be used to rapidly validate optimizers instead of having to run long experiments.

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Simulating Acoustic Orientation Trapping for Stable Levitation

Cited by 2 publications

References 8 publications

Omnidirectional microscopy by ultrasonic sample control

Omnidirectional microscopy by ultrasonic sample control

BEM-FEM Simulation of Acoustic Levitation Dynamics with Phased Arrays

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