Abstract: An energy harvester (1) converts kinetic energy into electrical energy. The energy harvester includes: one or more walls (3, 4, 5, 6, 7) defining a chamber (2), the chamber (2) being provided with a plurality of impactors (10) free to move within the chamber so as to impact at least one of the walls when the chamber is subjected to movement, and a transducer (9, 11) configured to convert the impact of the impactors on one or more of the walls into electrical energy.

Abstract: A method, apparatus and software are disclosed for wireless power transmission in which the power transmission frequency is optimised.

Abstract: A method, apparatus and software are disclosed for wireless power transmission in which the power transmission frequency is optimised.

Abstract: An acoustic transducer is disclosed in which a set of electrode arrays is arranged around a nominal center point and comprising a set of circumferentially disposed electrode elements. A piezoelectric material is located between a common electrode and said electrode elements.

Abstract: A support for an optical fiber partially submerged in a substrate is discloses in which the support is arranged with fiber fixing means for fixing a portion of the fiber to the support so that strain on the portion of the fiber external to the substrate and support member is at least partially diverted from the portion of the fiber internal to the support member.

Abstract: A method, apparatus and software is disclosed in which the location of the origin of a received acoustic emission in a structure is calculated by triangulating the times of flight of the acoustic emission to a distributed set of sensors and using a predetermined acoustic model of the structure.

Abstract: A support for an optical fibre partially submerged in a substrate is discloses in which the support is arranged with fibre fixing means for fixing a portion of the fibre to the support so that strain on the portion of the fibre external to the substrate and support member is at least partially diverted from the portion of the fibre internal to the support member.

Abstract: An acoustic transducer is disclosed in which a set of electrode arrays is arranged around a nominal centre point and comprising a set of circumferentially disposed electrode elements. A piezoelectric material is located between a common electrode and said electrode elements.

Abstract: A method, apparatus and software is disclosed in which the location of the origin of a received acoustic emission in a structure is calculated by triangulating the times of flight of the acoustic emission to a distributed set of sensors and using a predetermined acoustic model of the structure.

Abstract: The structural integrity of a safe-life aircraft component on an aircraft is measured and assessed by a processing unit. The component includes a load-bearing metal element that is free from cracks. In the method, acoustic emissions generated in the metal element are converted into electronic signals. The acoustic emissions converted include relevant acoustic emissions resulting from changes in the structure of the element that make the element more susceptible to the formation of cracks. The electronic signals are set to a processing unit. The processing unit processes over time the signals in conjunction with stored reference data that allows a measure of the structural integrity to be made. Information providing a measure of the structural integrity of the aircraft component is outputted. Thus, deterioration of the structure of the component can be detected and monitored before a crack occurs.