METHODS AND SYSTEMS FOR IMPROVING THE RELIABILITY OF ORTHOGONALLY REDUNDANT SENSORS

摘要

Methods and systems for sensor calibration and sensor glucose (SG) fusion are used advantageously to improve the accuracy and reliability of orthogonally redundant glucose sensor devices, which may include optical and electrochemical glucose sensors. Calibration for both sensors may be achieved via fixed-offset and/or dynamic regression methodologies, depending, e.g., on sensor stability and Isig-Ratio pair correlation. For SG fusion, respective integrity checks may be performed for SG values from the optical and electrochemical sensors, and the SG values calibrated if the integrity checks are passed. Integrity checks may include checking for sensitivity loss, noise, and drift. If the integrity checks are failed, in-line sensor mapping between the electrochemical and optical sensors may be performed prior to calibration. The electrochemical and optical SG values may be weighted (as a function of the respective sensor's overall reliability index (RI)) and the weighted SGs combined to obtain a single, fused SG value.

主权项

1. A method of correcting for a drift component of an output signal of a sensor, the method comprising:
measuring the output signal of the sensor over time to obtain a plurality of output signal measurements as a function of time, wherein each of said output signal measurements comprises a true output signal component and said drift component as a function of time; calculating, as a function of time, an estimate of the drift component of the plurality of output signal measurements; and calculating an estimate of the true output signal component as a function of time based on said estimate of the drift component.