Patent ID: 7926365
Filing Date: 2011-04-19
Classification: G01L,G06F

Abstract:
1. A pressure measurement method suitable for pressure sensing using the array type pressure sensing apparatus comprising: a plurality of first axes; a plurality of second axes, being disposed crisscross with the first axes; a plurality of piezoresistive units, one of which being disposed on the cross between one first axis and one second axis, capable of exhibiting different resistance values when being applied with different pressures; a third axis, being disposed crisscross with the first axes; a plurality of standard resistors, one of which being disposed on the cross between one first axis and the third axis, capable of exhibiting a constant resistance value when being applied with different pressures; and a control unit, having a plurality of I/O ports respectively coupled to the first axes, the second axes and the third axis, through which the control unit performs a tri-state logic scanning and driving process on the first axes, the second axes and the third axis; the pressure measurement method comprising: measuring voltage signals of the piezoresistive units and the standard resistor corresponding to each first axis; forming a voltage dividing matrix comprising the voltage signals of the piezoresistive units and the standard resistor corresponding to each first axis; forming a conductance matrix comprising inverses of resistance values of the piezoresistive units and the standard resistor, resulting in a product of the voltage dividing matrix and the conductance matrix being a zero matrix to form a set of piezoresistive simultaneous equations; and solving the set of piezoresistive simultaneous equations to acquire the resistance values of the piezoresistive units.