Nortek As

Nortekusa, Llc.

Atle Lohrmann

R Lee Gordon

Sven Nylund

Torstein Kanstad Pedersen

Raymond Lee Gordon

An AD2CP includes at least one transducer assembly emitting sets of slanted directional acoustic beams and receiving the echoes; and electronics that processes the echoes into depth cells and computes velocity in each depth cell. The AD2CP is configured so that each beam set has a profiling catenation, at least two of which are different, and the AD2CP is configured so that the emitting, receiving and processing operate contemporaneously.

Acoustic doppler dual current profiler system and method

A system for determining the directional properties of surface waves or internal waves of a fluid medium includes a sonar system having a plurality of transducers for generating respective, separate acoustic beams and receiving echoes from one or more range cells located substantially within the beams; and a computer program for determining the directional properties associated with the surface waves or internal waves from the received echoes, wherein the computer program determines along-beam velocities along the separate acoustic beams and combines the along-beam velocities to form an equivalent orbital velocity vector. The system is mounted on or in a sub surface buoy that can move or rotate during measurement and includes a motion sensor measuring six degrees of freedom to account for horizontal velocity and vertical displacement in the subsurface buoy mounted sonar system.

System and method for determining directional and non-directional fluid wave and current measurements

A system for determining the directional properties of surface waves or internal waves of a fluid medium includes a sonar system having a plurality of transducers for generating respective, separate acoustic beams and receiving echoes from one or more range cells located substantially within the beams; and a computer program executed by a processor for determining the directional properties associated with the surface waves or internal waves from the received echoes, wherein the computer program determines along-beam velocities along the separate acoustic beams and combines the along-beam velocities to form an equivalent orbital velocity vector.

A system, method and computer-program product for automatically calibrating a current measuring device. The system and method includes a means for automatically determining viable data segments that can be used for calibration purposes. A quality factor that is associated with each calibration realization is provided. The quality factor is an assessment of the quality of the data in a viable data segment as determined based on user input, statistical information, and the validity of the assumptions used to calculate the calibration coefficient.

System and method for automatically processing and calibrating data from a current measuring device

A method and apparatus for determining the surface level of a given body using acoustic ranging that incorporates processes natural to human beings to improve identification of the echo from the water surface when spurious echoes might otherwise overshadow it. An acoustic beam is transmitted toward the surface where it is reflected. The beam also reflects off various interferences creating spurious reflections or echoes. The echoes from the surface as well as the spurious echoes are then received. Each echo is then evaluated according to several criteria, in order to determine which echo is associated with the surface. In one embodiment, a set of candidate echoes is identified, the one most likely to represent the surface is selected by using multiple different criteria for evaluating the echo, assigning each criteria a sensible quality factor, computing an overall quality factor by mathematically combining the individual quality factors, and identifying the surface peak as the peak with the highest overall quality factor. In one embodiment, an evaluation technique involves measuring the amplitude, signal to noise ratio, and width of a received echo. In another embodiment, a first echo is compared to subsequent echoes to determine if the subsequent echoes are multiple bounces of the first echo. In still another embodiment, an independent input device, such as a pressure sensor, is used to make a rough measurement of the surface level. In another embodiment, measurement history is used to analyze the received echoes in order to aid in determining which echo corresponds to the surface.

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Oslo, Norway

Atle Lohrmann