Patent ID: 8380457
Filing Date: 2013-02-19
Classification: B01L,G01R

Abstract:
1. A method for determining the temperature of each of a plurality of multiplexed heater electrodes, wherein the heater electrodes are part of a multiplex circuit sharing a common lead connecting the electrodes to a power supply, said method comprising the steps of: a. for each heater electrode in said plurality of multiplexed heater electrodes: (1) connecting the power supply to a set of two or more other heater electrodes, and (2) measuring a voltage drop at said heater electrode, wherein the voltage drop is based on the equivalent resistance of a parallel combination of the set of said other heater electrodes in series with said heater electrode; b. computing a resistance of each of the plurality of multiplexed heater electrodes by solving for the resistance of each heater electrode based at least in part on the measured voltage drops; and c. deriving the temperature using a processor of each of the plurality of multiplexed heater electrodes from the computed resistance of each electrode.