A method is presented to calibrate the transfer function for a fluid-filled compliant cylinder as a function of wave number and frequency. An air-filled compliant cylinder has a first linear array of force sensors coupled to the cylinder's exterior surface. A turbulent flow field is generated in a fluid environment about the first linear array which generates an output indicative of pressure incident thereupon. A fluid- filled compliant cylinder identical ...
A method and system are provided for frequency filtering compressional wave energy. An elastic cylinder is filled with a fluid that is selected based on a fluid density pi and a dilatational wave phase velocity ci the thereof. When the elastic cylinder so-filled is subjected to a compressional wave propagating in a fluid environment, a first radial resonance frequency of the elastic cylinder is controlled by the fluid density pi ...
A method and system are provided to optimize filtering of compressional wave energy in the wavenumber domain for a given frequency range using a fluid-filled elastic cylinder. The fluid is selected based on its fluid density pi, and dilatational wave phase velocity C sub i
A method is presented to calibrate the transfer function for a fluid-filled compliant cylinder as a function of wavenumber and frequency. An air-filled compliant cylinder has a first linear array of force sensors coupled to the cylinder's exterior surface. A turbulent flow field is generated in a fluid environment about the first linear array which generates an output indicative of pressure incident thereupon. A fluid-filled compliant cylinder identical in diameter ...
A method and apparatus for locating artery stenoses in blood vessels includes providing an array of sensors on skin surface to acquire data for detecting, locating and analyzing energy emissions in three-dimensional objects. The array detects momentum transfer that exists in the object in the form of wave energy, and the detection is designed to occur on the surface of the object, thereby providing a non-intrusive method for locating artery ...
A composite hydrophone array assembly is made from a compliant mandrel such as a hollow tube and at least one wrap of piezoelectric film adhered to the compliant hollow tube at a plurality of locations thereon. Each location defines a composite hydrophone channel. The centers of adjacent hydrophone channels are separated along the length of the compliant hollow tube. To shade a hydrophone channel, the wall thickness of the hollow ...
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