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Variable sensing using frequency domain

  • US 8,060,325 B2
  • Filed: 11/12/2007
  • Issued: 11/15/2011
  • Est. Priority Date: 11/14/2006
  • Status: Active Grant
First Claim
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1. A method for monitoring an exposure of a system to a physical variable, the method comprising:

  • A) periodically sensing the physical variable to produce a sequential digital data stream having a plurality of digital samples wherein the physical variable is acceleration;

    B) collecting a known number of digital samples in sequence from the sequential digital data stream to form a first time domain data group;

    C) applying a windowing function to the first time domain data group, the windowing function minimizing a difference between a value of a first digital sample of the first time domain data group and a value of a last digital sample of the first time domain data group;

    D) converting the digital samples in the first time domain data group to respective frequency domain representations in a frequency domain after applying the windowing function to the first time domain data group; and

    E) calculating the exposure of the system to the physical variable in the frequency domain using the frequency domain representations;

    wherein step A) is performed using an accelerometer sensing the acceleration in at least one direction.

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