| 摘要 |
Methods and devices disclosed herein relate to the use of a band electrode to create a two-component current in an electrochemical sensor, preferably for use with a blood glucose monitor. The dimensions of the band electrode are smaller than that of the solution deposited on it, hence one component of the current will result from planar diffusion and the second from edge diffusion. By analyzing the plotted currents, both the concentration and the diffusion coefficient of the target analyte can be determined simultaneously, which offers an improved accuracy over the art in concentration measurement. Methods and devices disclosed herein also relate to the use of multiple band electrodes of different widths to increase the speed of measurement without adversely affecting accuracy. Methods and devices disclosed herein further relate to the use of alternating pulse voltages to measure the concentration of an analyte, taking advantage of the faster recovery time for the concentration profile. The alternating pulses also tend to perturb the concentration profile in only a thin diffusion layer, allowing various layers of the sample to be interrogated. |
