The levitation and driving performance of a contact-free manipulation device actuated by ultrasonic energy

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

“…A non-contact manipulation idea based on acoustic levitation is seen to be the best answer for avoiding the issues of damage, scratching, and contact pollution produced by traditional physical contact operations on high-precision materials or parts [81]. As mentioned earlier that acoustic levitation includes five methods according to [70] but here in this article we shall focus on the methods that have been already used in non-contact manipulation which are:…”

“…A novel ultrasonic array structure based on the FPGA was submitted by [80] when the embedded system decreases the complexity and cost of ultrasonic suspension technology equipment and enables container-less operation thanks to the phase control algorithm, which makes it possible for particles to be levitated and travel in both horizontal and vertical directions. A novel near-field acoustic levitationbased non-contact rotating handling technique for disk-shaped objects powered by ultrasonic energy was successfully presented by [81]. Next, acoustic levitation is further discussed in context of non-contact manipulation or handling.…”

Acoustic touchless sensor using the flexural vibration of a plate

“…Under-display ultrasonic fingerprint recognition prevents spoofing attacks on fingerprint recognition devices by detecting blood vessels under the skin. 16) However, the TOF-based ultrasound techniques use transmitters/receivers, which require a continuous power supply for sensing, and the conventional systems tend to consist of numerous components. 17) Consideration of the future application of these sensors in the industrial field means that touchless sensors with simple structures will be the most suitable.…”

“…21) In the case of ultrasound levitation using the acoustic radiation force, 22,23) the behavior of small objects levitated between the vibrating plate and reflector is dependent on the distance between them; the objects can be levitated around the nodal points of sound pressure in a standing-wave field when the distance between the vibrating plate and reflector is adjusted to a multiple of half wavelength. 16,24) The positions and parallelism of the vibrator and reflector can be evaluated by real-time cepstral analysis to generate the acoustic standing wave efficiently, 25) and small particles can be trapped in a wide range of ultrasound frequencies, not limited to the resonance conditions. 26,27) When the distance between an ultrasound vibrating plate and a planer object is much smaller than the wavelength of the standing wave, the acoustic radiation force acting on the object is dramatically increased, resulting in stable levitation with high rigidity (near-field acoustic levitation).…”