Abstract:
The present disclosure describes a system for providing a nonvolatile electrical energy source which employs a finite source of mechanical energy, metered in accordance with the electrical power demands of the utilization device. A basic embodiment of the system contemplated by the invention as a replacement for the volatile electro-chemical storage battery with its limited shelf life, comprises a spring-wound generator, electrical energy storage means, and electrical latching means controlled by upper and lower voltage limit sensors for metering out the mechanical energy of the spring as a function of the level of electrical energy present at any given time in the storage means.
Abstract:
A circuit technique is described for use with a mangetometer employing a thin magnetic film sensor in an inductance-variation mode, to provide an accurate determination of the absolute value of an external applied field. The technique includes the use of switching means coupled to the thin magnetic film for periodically reversing the state or sense of the film. In the absence of an external field, that is, with zero applied field, the magnetometer output remains at a constant reference level. In the presence of an external field, the magnetometer output is an alternating current signal having an amplitude proportional to the field magnitude and a phase corresponding to the polarity or direction of the field.