Method and device for detecting fault in a blood oxygen sensor
First Claim
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 by comparing the voltages V3 and V4.
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Abstract
A device for measuring blood oxygen content comprises a blood oxygen sensor interface, a signal processing unit, and a plurality of voltage sampling points. A method for detecting fault in a blood oxygen sensor comprises the steps of: connecting the blood oxygen sensor to the signal processing unit; providing voltage signals by the signal processing unit via a pair of testing terminals, for alternately driving two LEDs connected in inverse-parallel with each other in the blood oxygen sensor; sampling the voltages of the pair of testing terminals, respectively, and determining the fault relevant to the LEDs based on the relationship of the voltages; receiving current signals from a photodiode in the blood oxygen sensor by the signal processing unit via another pair of terminals, converting the received current signals into voltage signals, and outputting positive voltage signals via a reverser and a follower, respectively; and sampling the positive voltage signals respectively for determining the fault relevant to the photodiode. Thus, the fault of the sensor can be detected and determined by employing a plurality of sampling points without the tissue to be measured of the human body, thereby the output error due to the faults of the sensor can be avoided, and the device can be maintained conveniently.
5 Citations
11 Claims
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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:
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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 by comparing the voltages V3 and V4. - View Dependent Claims (2, 3, 4)
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5. A device for measuring blood oxygen content used for detecting fault in a blood oxygen sensor, the device comprising a signal processing unit and a blood oxygen sensor interface, in which the blood oxygen sensor interface serves to provide input and output signals for connecting the signal processing unit to the blood oxygen sensor, and comprises a pair of input and output ports for providing the driving voltages to operate LEDs in the blood oxygen sensor, a pair of input and output ports for receiving currents from a photodiode in the blood oxygen sensor, and a ground terminal for making shielding layers in the blood oxygen sensor common ground with the signal processing unit;
- wherein
the signal processing unit comprises a polarity exchange device for exchanging the polarities of the driving voltages, and at least two voltage sampling points, and wherein the signal processing unit is configured to compare the voltages to one another to determine faults relevant to the blood oxygen sensor. - View Dependent Claims (6, 7, 8)
- wherein
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9. A method for detecting a fault condition in a blood oxygen sensor configured to measure blood oxygen content using a photodiode, comprising:
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receiving current signals from the photodiode, the current signals measured at a pair of terminals; converting the current signals into terminal voltage signals; generating a group of comparison voltages V1 and V2 using the terminal voltage signals; and detecting a fault condition relating to the photodiode by comparing the group of voltages V1 and V2. - View Dependent Claims (10, 11)
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Specification