Abstract: Apparatus and method for harvesting energy from the environment and/or other external sources and converting it to useful electrical energy. The harvester does not contain a permanent magnet or other local field source but instead relies on the earth's magnetic field of another source of a magnetic field that is external to the sensing device. One advantage of these new harvesters is that they can be made smaller and lighter than energy harvesters that contain a magnet and/or an inertial mass.

Abstract: Apparatus and method for harvesting energy from the environment and/or other external sources and converting it to useful electrical energy. The harvester does not contain a permanent magnet or other local field source but instead relies on the earth's magnetic field of another source of a magnetic field that is external to the sensing device. One advantage of these new harvesters is that they can be made smaller and lighter than energy harvesters that contain a magnet and/or an inertial mass.

Abstract: Apparatus and method for harvesting energy from the environment and/or other external sources and converting it to useful electrical energy. The harvester does not contain a permanent magnet or other local field source but instead relies on the earth's magnetic field of another source of a magnetic field that is external to the sensing device. One advantage of these new harvesters is that they can be made smaller and lighter than energy harvesters that contain a magnet and/or an inertial mass.

Abstract: An inductive energy harvester comprises a permanent magnet magnetic field source attached by a pair of compact spiral disk springs to an induction coil. The springs position the magnet so that the induction coil surrounds one end of the magnet where the flux density is greatest. In addition, the magnetic flux emerging from that end of the magnet is enhanced by a disk of magnetic material having high permeability and high flux density. In another embodiment, the magnetic field source comprises two dipole magnets arranged in opposing flux relationship with a thin layer of high flux density, high magnetic permeability material located in a gap between the magnets.

Abstract: A unipotential electrostatic lens and method of operation for charged particle beam tubes of the electron beam, compound fly's eye type having both coarse and fine deflection sections wherein the objective lens assembly may lack coaxial symmetry about the lens axis. The unipotential lens comprises an assembly of axially aligned electrostatic lens elements with each lens element having an array of micro lenslet apertures and with each set of axially aligned micro lenslet apertures forming a micro lenslet. Preferably, there are three such lens elements in the assembly with a high voltage excitation potential supplied to the center lens element. A dynamic focus correction potential derived from the deflection potentials applied to the tube is supplied to the entrance outer lens element closest to the electron gun of the beam tube. The remaining outer lens element is maintained at system ground reference potential.