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Spectroscopic sensors

  • US 9,095,291 B2
  • Filed: 08/07/2009
  • Issued: 08/04/2015
  • Est. Priority Date: 08/07/2008
  • Status: Active Grant
First Claim
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1. A sensor, comprising:

  • a circuit board comprising an electronic processor;

    a plurality of radiation sources, each source being mounted directly to the circuit board; and

    a spectral detector attached to the circuit board, the spectral detector being configured to analyze radiation derived from one or more of the plurality of radiation sources,wherein the plurality of radiation sources comprises a short-distance source positioned at a distance of 9 mm or less from the detector, and at least two long-distance sources each positioned at different distances at least 10 mm from the detector; and

    wherein during operation of the sensor, the electronic processor is configured to;

    select one of the at least two long-distance sources by;

    (i) exposing a subject to incident radiation produced by one of the long-distance sources;

    (ii) measuring reflected or transmitted radiation from the subject using the spectral detector;

    (iii) repeating (i) and (ii) for each of the long-distance sources to generate spectral information corresponding to each of the long-distance sources;

    (iv) comparing the spectral information for each of the long-distance sources to expected peak information to determine which ones of the long-distance sources are suitable for illumination of the subject; and

    (v) selecting one of the suitable long-distance sources from (iv) based on acquisition times associated with the spectral information corresponding to each of the suitable long-distance sources;

    expose the subject to incident radiation from the short-distance source and from the selected long-distance source and use the spectral detector to measure radiation from the subject corresponding to illumination by the short-distance source and the selected long-distance source; and

    analyze the measured radiation to determine one or more properties of the subject.

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