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Method and device for detecting fault in a blood oxygen sensor

  • US 20060206020A1
  • Filed: 12/22/2005
  • Published: 09/14/2006
  • Est. Priority Date: 03/10/2005
  • Status: Active Grant
First Claim
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1. A method for detecting fault in a blood oxygen sensor, which is used in a device for measuring blood oxygen content, wherein the method comprises the steps of:

  • a. connecting the blood oxygen sensor to a signal processing unit;

    b. alternately outputting, from the signal processing unit, voltage signals of reverse polarities via a pair of testing terminals, for alternately driving the two LEDs connected in inverse-parallel with each other in the blood oxygen sensor;

    c. sampling voltages to ground of the pair of testing terminals respectively and generating a group of comparison voltages V3 and V4 by the device for measuring blood oxygen content each time the signal processing unit outputs a voltage signal of one polarity; and

    d. determining the faults relevant to the LEDs that occur in the blood oxygen sensor on the basis of the comparison voltages V3 and V4 by the device for measuring blood oxygen content.

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