Sensor verification through forward voltage measurements
US10849538B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2020 |
| Grant date | Dec 1, 2020 |
| Priority date | — |
| Expiry date | Apr 24, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2635
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A device for measuring oxygen saturation includes circuitry configured to, while applying first current, measure a first forward voltage across the anode of the first light emitting diode and the cathode of the first light emitting diode and, while applying second current, measure a second forward voltage across the anode of the second light emitting diode and the cathode of the second light emitting diode. The circuitry is further configured to determine a measured difference of forward voltage based on a comparison of the first forward voltage and the second forward voltage and determine that the first and second light emitting diodes are valid based on a calibrated difference of forward voltage and the measured difference of forward voltage. In response to the determination that the first and second light emitting diodes are valid, the circuitry is configured to determine an oxygen saturation level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.