CAPACITANCE DETECTION IN ELECTROCHEMICAL ASSAYS
First Claim
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1. A method of determining capacitance of a biosensor chamber having a two electrodes disposed in the chamber and coupled to a microcontroller, the method comprising:
- initiating an electrochemical reaction in the biosensor chamber;
applying an oscillating voltage of a predetermined frequency to the chamber;
determining a phase angle between a current output and the oscillating voltage from the chamber; and
calculating a capacitance of the chamber based on a product of the current output and a sine of the phase angle divided by a product of two times pi times the frequency and the voltage.
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Abstract
A method and system are provided to determine fill sufficiency of a biosensor test chamber by determining capacitance of the test chamber.
25 Citations
9 Claims
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1. A method of determining capacitance of a biosensor chamber having a two electrodes disposed in the chamber and coupled to a microcontroller, the method comprising:
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initiating an electrochemical reaction in the biosensor chamber; applying an oscillating voltage of a predetermined frequency to the chamber; determining a phase angle between a current output and the oscillating voltage from the chamber; and calculating a capacitance of the chamber based on a product of the current output and a sine of the phase angle divided by a product of two times pi times the frequency and the voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An analyte measurement system comprising:
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An analyte test strip including; a substrate having a reagent disposed thereon; at least two electrodes proximate the reagent in test chamber; an analyte meter including; a strip port connector disposed to connect to the two electrodes; a power supply; and a microcontroller electrically coupled to the strip port connector and the power supply, the microcontroller being programmed to; (a) initiate an electrochemical reaction in the biosensor chamber;
apply an oscillating voltage of a predetermined frequency to the chamber;(b) determine a phase angle between a current output and the oscillating voltage from the chamber; and (c) calculate a capacitance of the chamber based on a product of the current output and a sine of the phase angle divided by a product of two times pi times the frequency and the voltage.
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9. An analyte measurement system comprising:
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An analyte test strip including; a substrate having a reagent disposed thereon; at least two electrodes proximate the reagent in test chamber; an analyte meter including; a strip port connector disposed to connect to the two electrodes; a power supply; and a microcontroller electrically coupled to the strip port connector and the power supply such that a percent error in capacitance measurement of the test strip across a range of capacitance as compared to a referential parallel R-C circuit is less than about 3%.
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Specification