Tracking algorithm for linear array signal processor for fabry-perot cross-correlation pattern and method of using same
First Claim
1. A method for calculating the interferometric gap produced from the cross-correlation of an interferometeric sensor and interferometric correlation element, said method comprising:
- providing an interferometric sensor having a first gap;
providing an interferometric correlation element having a substantially linear varying second gap, said second gap comprising a dispersive material placed in series with said first gap;
generating a correlation burst waveform having a plurality of features including peaks and valleys from the cross-correlation of said sensor and said correlation element wherein the shape of the burst waveform evolves due to dispersion across the range of the second gap;
means for tracking said features across an entire range of first gaps and determining the dominant peak or dominant valley; and
using the dominant peak or dominant valley to determine the first gap that the dominant peak or dominant valley represents.
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Abstract
An algorithm and method for calculating an interferometric gap is disclosed that comprises providing an interferometric sensor having a first gap and an interferometric correlation element having a second gap placed in series with the first gap. A correlation burst waveform is generated having a plurality of features wherein the shape of the burst waveform evolves across the range of the second gap. Means are provided for tracking the features across the entire range of gaps and determining the dominant peak or dominant valley to determine the first gap.
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Citations
24 Claims
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1. A method for calculating the interferometric gap produced from the cross-correlation of an interferometeric sensor and interferometric correlation element, said method comprising:
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providing an interferometric sensor having a first gap;
providing an interferometric correlation element having a substantially linear varying second gap, said second gap comprising a dispersive material placed in series with said first gap;
generating a correlation burst waveform having a plurality of features including peaks and valleys from the cross-correlation of said sensor and said correlation element wherein the shape of the burst waveform evolves due to dispersion across the range of the second gap;
means for tracking said features across an entire range of first gaps and determining the dominant peak or dominant valley; and
using the dominant peak or dominant valley to determine the first gap that the dominant peak or dominant valley represents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for calculating the interferometric gap produced from the cross-correlation of an interferometeric sensor and an interferometric correlation element, said method comprising:
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providing a Fabry-Perot interferometric sensor having a first gap;
providing a wedge or Fizeau interferometric correlation element having a second gap comprising a dispersive material, said correlation element placed in series with said Fabry-Perot sensor;
generating a correlation burst waveform having a plurality of features including peaks and valleys from the cross-correlation of said sensor and said correlation element wherein the shape of the burst waveform evolves across the range of first gaps as the first gap changes;
means for tracking said features across an entire range of first gaps and determining the dominant peak or dominant valley; and
using the dominant peak or dominant valley to determine the first gap that the dominant peak or dominant valley represents. - View Dependent Claims (12, 13, 14, 15)
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16. A linear array signal processor (LASP) comprising:
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an interferometric sensor having a first gap;
an interferometric correlation element having a second gap comprised of a dispersive material, said correlation element placed in series with said first sensor;
a CCD array attached to said correlation element to read out a correlation pattern;
means for identifying a correlation burst waveform having a plurality of features including peaks and valleys from the cross-correlation of said sensor and said correlation element wherein the shape of the burst waveform evolves across the range of first gaps as the first gap changes;
means for tracking said features across an entire range of first gaps and determining the dominant peak or dominant valley; and
using the dominant peak or dominant valley to determine the first gap that the dominant peak or dominant valley represents. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification