Abstract: A method of monitoring or assessing the motion of the limbs of a body when performing repetitive cyclic activity uses inertial measurement units secured to each of the limbs to be monitored. The operation of all of the IMUs is synchronized by way of a pulse from a computer. On performing the repetitive cyclic activity such as walking, running, trotting or galloping, the outputs of the IMUs are assembled and analyzed in realtime, to determine the relative phase of the limb movements, from which an assessment of the gait may be made.

Abstract: A method of monitoring or assessing the motion of the limbs of a body when performing repetitive cyclic activity uses inertial measurement units secured to each of the limbs to be monitored. The operation of all of the IMUs is synchronised by way of a pulse from a computer. On performing the repetitive cyclic activity such as walking, running, trotting or galloping, the outputs of the IMUs are assembled and analysed in realtime, to determine the relative phase of the limb movements, from which an assessment of the gait may be made.

Abstract: A solid state angular rate sensor is fabricated by preparation of a disc-shaped base structure (10) having first and second outer layers of a piezo-electric ceramic material, built up from a number of layers of a ceramic sheet or film that is capable of being tape-cast. The layers are then sintered and an inner layer of metallic material is provided between the outer layers, to complete a piezo-electric base structure having an inner electrode (15) between the sintered outer layers. Arrays of electrode structures are provided on the outer layers of the base structure (10), the electrodes radiating from the central region 14 of the base structure (10) and being equi-spaced around the outer edge of the disc (19).

Abstract: A micro-electro-mechanical systems (MEMS) accelerometer comprises a wafer micro-fabricated to provide a frame (10) defining an opening within which is disposed a sensing mass (14). A pair of aligned pivot beams (15) connect the mass to the frame (10) so that the axis of pivoting is displaced from the centre of gravity of the mass. At least one sensing beam (16) connects the mass (14) to the frame, the sensing beam (16) being distorted by pivoting movement of the mass (14). Distortion of the sensing beam on pivoting movement of the mass is determined, from which the acceleration of the accelerometer may be determined.