Helett Packard has revealed a new accelerometer based on a novel design claiming it can sensure motions far more sensitively than competitors devices. The sensor can measure down to 100 nano-g per root Hertz and is based on a capacitive sensing principle.
In standard sensors using capacitve sensing, the distance between the electrodes of a capacitor is changed thereby changing the capacitance. In this design two arrays of small electrodes seperated by a fixed gap are used. External acceleration changes the overlap of the electrodes, hence changing the capacitance.