Real-time self-calibrating sensor system and method
US7774038B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2005 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Jun 11, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2005/1726
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A system and method for calibrating a sensor of a characteristic monitoring system in real time utilizes a self-calibration module for periodic determination of, and compensation for, the IR drop across unwanted resistances in a cell. A current-interrupt switch is used to open the self-calibration module circuit and either measure the IR drop using a high-frequency (MHz) ADC module, or estimate it through linear regression of acquired samples of the voltage across the sensor's working and reference electrodes (Vmeasured) over time. The IR drop is then subtracted from the closed-circuit value of Vmeasured to calculate the overpotential that exists in the cell (Vimportant). Vimportant may be further optimized by subtracting the value of the open-circuit voltage (Voc) across the sensor's working and reference electrodes. The values of Vmeasured and Vimportant are then controlled by respective first and second control units to compensate for the IR drop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.