منابع مشابه
An integrated 3D sound intensity sensor using four-wire particle velocity sensors: I
Complete characterization of a sound field requires measurement of both sound pressure and particle velocity. In this paper, a new symmetrical four-wire sensor configuration is discussed which has a lower noise floor than its two-wire version and measures in two dimensions. With a pair of four-wire sensors, a fully integrated 3D particle velocity sensor is realized with smaller size than its pr...
متن کاملAn integrated 3D sound intensity sensor using four-wire particle velocity sensors: II
The sensitivity of a micromachined acoustic sensor consisting of four hot-wire particle velocity sensors is analysed theoretically and experimentally. The device and its fabrication have been presented in part 1 of this paper (Yntema et al 2010 J. Micromech. Microeng. 20 015042). A relatively straightforward analytical model is presented that describes both the air flow around the probe and the...
متن کاملDirectional Sensitivity of a Three Dimensional Particle Velocity Sensor
⎯ The omni-directional sensitivity pattern of an integrated three dimensional acoustic sensor, composed of four hot-wire particle velocity sensors is analyzed theoretically and experimentally. We investigate the influence of the presence of the probe surface on the direction of the measured particle velocity measured by the sensors, and a description of the gas flow profile around the integrate...
متن کاملParticle image velocimetry measurements of blood velocity in a continuous flow ventricular assist device.
The third prototype of a continuous flow ventricular assist device (CFVAD3) is being developed and tested for implantation in humans. The blood in the pump flows through a fully shrouded four-bladed impeller (supported by magnetic bearings) and through small clearance regions on either side of the impeller. Measurements of velocities using particle image velocimetry of a fluid with the same vis...
متن کاملVelocity Correlations of a Brownian Particle Velocity Correlations of a Brownian Particle
A new derivation of the velocity correlations of a thermally fluctuating Brownian particle is shown by direct calculation from a stochastic hydrodynamic model in which the fluid-particle coupling is treated in a simple manner. The model significantly simplifies the calculation of statistics of a particle and has the virtue of being readily amenable to numerical simulation. To show that the mode...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 2006
ISSN: 0001-4966
DOI: 10.1121/1.2151797