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System and methods for dynamic range extension using variable length integration time sampling

  • US 20040069928A1
  • Filed: 10/15/2002
  • Published: 04/15/2004
  • Est. Priority Date: 10/15/2002
  • Status: Active Grant
First Claim
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1. A method for dynamic range extension during the processing of a photo-detector acquired signal, the method comprising:

  • acquiring a first signal component and a second signal component from a photo-detector wherein the first signal component comprises an integration of the photo-detector signal during a first time interval and wherein the second signal component comprises integration of the photo-detector signal during a second time interval wherein the second time interval is temporally proximal to and shorter than the first time interval such that the second signal component and the first signal component represent the acquired values of the photo-detector signal during a selected time period delineated by the first and second time intervals;

    determining a scaling factor between the second signal component and the first signal component;

    determining if the first signal component exceeds a selected dynamic range;

    if the first signal component exceeds the dynamic range, scaling the second signal component by the scaling factor to approximate the first signal component; and

    using the scaled second signal component to represent the value of the signal during the selected time period.

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