Abstract: A phase-controlled pulse signal generator, comprising a magnetic field source born by a rotating shaft, and a Hall effect sensor submitted to the field, the sinusoidal signal delivered being processed by a phase correcting circuit controlled by the speed of the shaft, followed by a triggered pulse circuit.

Abstract: A magnetic coin element sensor for sensing, detecting and identifying coin elements and the like interposed in a magnetic field wherein the metallurgical structure of each interposed coin element causes an identifiable change in the magnetic field responsive to the metallurgical structure of the interposed coin element and uniquely indicative of the interposed coin element, the change in the magnetic field being sensed, detected and utilized to uniquely identify each of the interposed coin elements. The magnetic coin sensor is particularly useful for identifying coins deposited in a coin handling apparatus such as a vending machine, a coin telephone or the like.

Abstract: An exciter for use with a shaft speed magnetic pickup includes a strip of flexible, stretchable, sheet material having a plurality of magnetic elements attached to it that are uniformly spaced along the strip, enabling the magnetic elements to be attached to the exterior of various diameter rotatable shafts by stretching and fastening the strip about the circumference of the shaft close to the magnetic pickup which generates an electrical pulse signal whenever a magnetic element passes by it. The pulse signal is processed to produce a readout of shaft speed. Two magnetic pickups circumferentially spaced about the shaft closer than the circumferential spacing of the magnetic elements are used to provide signals that can be processed to indicate shaft direction of rotation as well as shaft speed.

Abstract: A detector for measuring relative movement and/or displacement between two relatively movable members comprises a plurality of regularly shaped elements of magnetic material e.g. steel balls, periodically spaced along a path which is preferably linear, and a transducer which is movable relative to the elements in a direction parallel to said path. The transducer comprises a transmitter coil, or series of coils, disposed for producing a magnetic field parallel to said path, and at least two pick-up coils encasing the path and displaced along it. The pick-up coils sense the variation in the magnetic field due to the presence of the elements, so that the relative spacing of the pickup coils and the elements enable, on the production of the magnetic field, the generation by the pick-up coils of output signals denoting the relative movement between the members.