The sensor elements in both horizontal and vertical arrays
were spaced 1 cm apart and were able to resolve variations
in pressure of approximately 2 cmH2O (note that this is not
a fixed lower limit; it is determined by the 12-bit analogue to
digital converter used in the data acquisition unit. Resolutions
of 10 km being readily
achievable. The total number of sensing regions is limited to
144 elements using the equipment currently available in our
lab. This does not represent a hard upper limit to the sensor
numbers however, and alternative off-the-shelf technologies
are available that would allow the sensor numbers to be
increased significantly