| Title |
Implementation of a High-performance Acoustic Levitation Volumetric Display using a Modular 512-channel Ultrasonic Phased Array System |
| Authors |
서민교(Mingyoe Seo) ; 황준하(Junha Hwang) ; 홍석(Seok Hong) ; 이상열(Sangyul Lee) |
| Keywords |
Volumetric display; Acoustic levitation; Phased array; Modular system; FPGA |
| Abstract |
This study proposes a modular 512-channel ultrasonic phased array system to overcome the channel limitations of conventional acoustic levitation systems. Existing systems with fixed 64?256 channels have restricted control areas and require complete hardware redesign for expansion. The proposed system implements a modular design based on Master-Slave FPGA architecture, enabling theoretically infinite channel scalability. Each module independently controls 256 transducers, forming a single acoustic trap through precise phase synchronization. Using 40 kHz ultrasound, the system levitates the 2-mm-diameter polystyrene particles and manipulates them along 3D trajectories. Performance evaluation demonstrates that the 512-channel system achieves 125 % improvement in X-Y plane control area (100 cm²→225 cm²) and 45 % increase in maximum Z-axis height (9.8 cm→14.2 cm) compared to the 242-channel system. The step distance per phase decreased from 3.8 mm to 2.1 mm, significantly enhancing spatial resolution. Square trajectory experiments confirmed stable control even at corner points. Notably, the system can be implemented at approximately 1 million KRW, providing high cost-effectiveness. This advancement presents practical applications for volumetric displays in medical imaging, CAD, education, and arts. |