Table 3  Estimated current densities for the 4 extreme heater geometries.
sheater  wheater  lheater  IAu  IAu/Across−section  IPt  IPt/Across−section
[mm]  [mm]  [mm]  [mA]  [109 A m−2]  [mA]  [108 A m−2]
0.3  0.3  134.9  32  1.06  14  4.73
0.3  2.0  46.4  54  1.84  24  8.06
2.0  0.3  30.9  172  8.60  77  3.83
2.0  2.0  22.2  203  1.01  90  4.51