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The focused ultrasound (FUS) systems are widely used due to their ability to generate a tight and intense focal region from a distributed source for the non-invasive and safely detection. However, these devices usually require elaborate arrays of a rather complex and cumbersome set of transducers. Holographic techniques are fundamental to applications such as volumetric displays and tweezers. The...
The histogram algorithm based on sound intensity having been widely used to estimate the azimuths of underwater acoustic targets. The advantage of this algorithm is that all we need is a single vector hydrophone to distinguish multiple targets' azimuths. The histogram approach acquiesces in that the acoustic pressure is perfectly correlated with the particle velocity. However, the sound field excited...
In this paper, an improved joint processing algorithm based on Estimation of Signal Parameters via Rotational Invariance Technique(ESPRIT), which can efficiently combine acoustic pressure and analytic velocity, is proposed to estimate azimuth angle. This method can be applied in acoustic vector sensor array (AVSA) of any formation. A novel cross-covariance matrix of acoustic pressure and analytic...
Ultrasonic flow meter which provides non-invasive no-moving-parts construction is one of the fasted-growing technologies in flow gauging. Based on the general elasticity theory, this paper investigates sound wave propagation in elastic solid, as well as the mathematical description of ultrasonic transducer with the help of electric-acoustic analysis. Moreover, wave phenomenon in moving fluid is introduced...
Conventional methods for fabricating ultrasound imaging transducers especially for high frequency (>20 MHz) range are expensive, time consuming and limited to relatively simple geometries. In this paper, the development of an additive digital micro-manufacturing method for piezomaterials and composites based on digital micromirror devices (DMD) to be used in HF ultrasound transducers is presented...
The finite element model of a light bus body is established. The vibration modalities are evaluated using finite element software. The simulated results are compared with test date. It shows that the model has represented the vibration characteristics of the original structure. The finite element model for the acoustic cavity is established. The first step modality in the longitudinal direction of...
Separation of suspended particles with ultrasonic radiation force suggests advantages in MEMS. But there are some difficulties to position the outlets in MEMS ultrasonic separator based on one-dimensional resonance. In this paper, a new type of MEMS ultrasonic resonance separator, where two anti-phase PZT-transducers are employed to generalize two-dimensional normal mode, is analyzed. This new separator...
Particles in fluid suffer the acoustic radiation force from the different physical characteristic between suspended particle and host liquid, so particles would move to predetermined positions in certain sound field. The separation technique utilizing acoustic radiation force is a promising alternative method to conventional technologies, especially in Micro Electro Mechanical Systems (MEMS). This...
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