Abstract: Methods and apparatus for sensing hydrogen in a mixture of hydrogen and natural gas are provided. One example of the apparatus comprises: a first chamber for receiving air; a second chamber for receiving the mixture of hydrogen and natural gas; a first electrode for adsorbing oxygen molecules from air in the first chamber and for reducing the oxygen molecules to oxide ions; a second electrode; an ionic conductor for transporting the oxide ions from the first electrode to the second electrode in order to cause the transported oxide ions to combine with hydrogen molecules at the second electrode; sensing circuitry for sensing an electrical parameter associated with the combination of the transported oxide ions with the hydrogen molecules at the second electrode; and processing circuitry configured to determine a proportion of hydrogen in the mixture, based at least in part on the electrical parameter sensed by the sensing circuitry.

Abstract: An inductive coupling interface couples a first electronic device to an inductive coupling link of a second electronic device. The second device link is in a coupling zone adjacent the interface. A separation plane separates the coupling zone from the interface. The interface includes a pair of coils arranged on one side of the separation plane opposite the coupling zone. The coils are coupled in series to receive an input signal from the first device and generate flux based thereon. Each coil is wound in a coil plane in a winding direction, and has a first flux face as defined by the winding direction and a coil plane axis residing within the coil plane. The first flux faces of the coils respectively face toward and away from the separation plane. The coil plane axes are parallel to one another and the separation plane, and the same distance from the separation plane. Each coil has inner and outer sides parallel to the coil plane axis and respectively closer to and farther from the other coil.