Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2006-09-19
2006-09-19
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C702S045000, C702S049000, C073S861060
Reexamination Certificate
active
07110893
ABSTRACT:
Various methods are described which increase the efficiency and accuracy of a signal processor in determining parameters of a fluid using signals output by a spatial array of sensors disposed along a pipe. In one aspect, parameters used for calculating the temporal Fourier transform of the pressure signals, specifically the amount or duration of the data that the windowing function is applied to and the temporal frequency range, are adjusted in response to the determined parameter. In another aspect, an initialization routine estimates flow velocity so the window length and temporal frequency range can be initially set prior to the full array processing. In another aspect, the quality of one or more of the parameters is determined and used to gate the output of the apparatus in the event of low confidence in the measurement and/or no flow conditions. In another aspect, a method for determining a convective ridge of the pressure signals in the k-ω plane is provided.
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Davis Allen R.
Loose Douglas H.
Barlow John
Cherry Stephen J
CiDRA Corporation
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