Journal of Sensors / 2018 / Article / Tab 1 / Research Article
Improving Accuracy in the Readout of Resistive Sensor Arrays Table 1 Comparison of the results obtained in an 8 × 8 array with different values of
if
Ω and the rest of the resistors of the array, Rns, take different values. (a) Classical approach. (b) ZPM circuit proposed by Wu et al. (c) Results for the proposed method in the first step. (d) Results for the proposed method in the second step.
(a) ZPM classical approach
Rs = 1 Ω Error (%), 100 500 2000 5000 7500 10000 100 16.00 12.39 5.48 5.68 13.30 19.78 200 9.10 7.19 5.95 4.07 2.59 1.16 300 6.73 5.02 4.42 3.77 3.27 2.79 400 5.55 3.88 3.44 3.11 2.88 2.65 600 4.36 2.73 2.38 2.22 2.12 2.03 800 3.77 2.15 1.82 1.70 1.64 1.58 1200 3.18 1.57 1.25 1.15 1.11 1.08 1800 2.79 1.18 0.86 0.78 0.74 0.72 3000 2.47 0.87 0.55 0.47 0.44 0.42 6000 2.24 0.63 0.32 0.24 0.21 0.19 10000 2.14 0.54 0.23 0.15 0.12 0.10
(b) ZPM-Wu
Rs = 1 Ω Error (%), Ω ) 100 500 2000 5000 7500 10000 100 97.34 68.28 92.43 97.00 98.00 98.50 200 15.26 84.06 95.65 98.21 98.80 99.10 300 10.83 72.51 91.38 96.37 97.55 98.15 400 18.78 54.82 83.04 92.46 94.85 96.08 600 1.16 1.15 1.09 0.99 0.90 0.81 800 0.87 0.87 0.84 0.78 0.73 0.68 1200 0.58 0.58 0.56 0.53 0.50 0.48 1800 0.39 0.39 0.37 0.35 0.33 0.32 3000 0.23 0.23 0.22 0.20 0.19 0.17 6000 0.12 0.11 0.11 0.09 0.07 0.06 10000 0.07 0.07 0.06 0.04 0.03 0.01
(c) ZPM proposed method, 1st step
Rs = 1 Ω Error (%), Ω ) 100 500 2000 5000 7500 10000 100 1.83 1.22 0.35 3.30 5.62 7.84 200 0.60 0.45 0.28 0.01 0.26 0.50 300 0.32 0.22 0.16 0.06 0.02 0.10 400 0.21 0.13 0.09 0.03 0.02 0.06 600 0.12 0.06 0.04 0.00 0.03 0.06 800 0.08 0.04 0.01 0.02 0.04 0.07 1200 0.06 0.02 0.00 0.03 0.05 0.07 1800 0.04 0.01 0.01 0.03 0.05 0.07 3000 0.03 0.00 0.01 0.03 0.05 0.06 6000 0.02 0.00 0.01 0.03 0.05 0.06 10000 0.02 0.00 0.01 0.03 0.04 0.06
(d) ZPM proposed method, 2nd step
Rs = 1 Ω Error (%), 100 500 2000 5000 7500 10000 100 0.24 0.14 0.13 0.64 1.06 1.48 200 0.04 0.02 0.02 0.10 0.17 0.23 300 0.02 0.00 0.02 0.07 0.12 0.16 400 0.01 0.00 0.02 0.06 0.10 0.13 600 0.00 0.00 0.02 0.05 0.08 0.11 800 0.00 0.00 0.02 0.05 0.07 0.09 1200 0.00 0.00 0.02 0.04 0.06 0.08 1800 0.00 0.00 0.01 0.04 0.06 0.07 3000 0.00 0.00 0.01 0.03 0.05 0.07 6000 0.00 0.00 0.01 0.03 0.05 0.06 10000 0.00 0.00 0.01 0.03 0.04 0.06
