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Ultrasonic standing waves (USWs) particle sorting has shown great potential to develop diverse applications in biotechnology and medical research due to its ability to offer non-contact, label-free particle manipulation. Currently, most reported on-chip acoustic particle sorters rely on high Q-value materials and elaborate geometry designs, which make these devices not easy to build and unsuited for...
The previously reported on-chip acoustic particle sorters mostly rely on high Q-value materials and elaborate geometry designs, which makes these devices not easy to build and unsuited for mass fabrication. In this work, we presented a novel two stage acoustic particle sorting approach with the advantages of operating on low-cost polymer-based microchips and using integrated micromachined ultrasound...
This paper presents the concept, basic theory, fabrication, and testing results of dual-electrode bimorph piezoelectric micromachined ultrasonic transducers (pMUTs) for both air- and liquid-coupled applications. Both the theoretical analyses and experimental verifications under the proposed differential drive scheme display high drive sensitivity and an electromechanical coupling energy efficiency...
The concept of “bimorph” piezoelectric micromachined ultrasonic transducers (pMUTs) has been demonstrated by utilizing a two active AlN layers structure constructed in a CMOS-compatible process. The prototype device has two 0.95µm-thick AlN layers sandwiched by three 0.15µm-thick Mo electrodes. In a prototype, both an inner circular and an outer annular electrode are designed on a 230 µm in radius,...
The MEMS technology is a new attempt to design hydrophone. In this paper, the fundamental principle of a novel biomimetic MEMS vector hydrophone based on the meso-piezoresistive effect is introduced, and a self-adapting root-MUSIC algorithm for vector hydrophone array is proposed. The simulation experiment results show the better performance with low Signal-to-Noise (SNR) in direction of arrival (DOA)...
According to the Root-MUSIC algorithm for acoustic pressure sensor array, we put forward a new Root-MUSIC algorithm with real-valued eigendecomposition for acoustic vector sensor array,. By way of recomposing the covariance matrix of vector sensor array and selecting appropriate lead orientation vector via spatial spectrum of array signal, we successfully evaluate the Direction of Arriva (DOA). Theory...
The vector sensor can be competent for measuring the information of pressure and velocity synchronously and independently. Acoustic multi user communication system based on single vector sensor, which can be used to separate several source from each other by calculating the inverse channel matrix, can be equivalent to MIMO system. Theoretical calculation and simulation have shown that the algorithm...
Voice onset time (VOT) has been considered as one of the crucial methods for examining the timing of voicing in stop consonants in many languages. This study was designed to examine VOT production for phonetically voiceless stops of Mandarin and English by native Chinese speakers. Thirty-six Taiwanese Chinese speakers participated in this study. The results indicates that: 1) Based on the three universal...
In order to examine the dynamics characteristic of cavitation bubble in terms of different dynamics parameter of radius and volume respectively. So we consider the dynamics factor of viscosity, the surface tension, the vapour pressure and the adiabatic compress. To use the Gear Stiff algorithm to simulate the famous traditional Rayleigh-Plesset equation in terms of radius frame and use the Runge-Kutta...
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