Abstract: A position sensor including a guide bar carrying a magnetic tape generating a magnetic field whose intensity varies sinusoidally along a longitudinal axis of the guide bar. A pick-up head is mounted adjacent the guide bar for translational movement therealong to detect the magnetic field. More particularly, the pick-up head comprises two magnetic field detectors spaced apart by a predetermined distance in the direction of translational motion of the pick-up head, each magnetic field detector generating an output signal representative of the magnetic field intensity at the position of detection thereof. By processing the output signals of the magnetic field detectors, it is possible to accurately determine the position of the pick-up head with respect to the guide bar. Advantageously, the position sensor may be used for the construction of a torque meter.

Abstract: The present invention relates to a device for detecting and measuring tor transmitted from a prime mover to a rotary machine acting as a load. The device includes a torsion shaft through which the torque is transmitted and as a result it is slightly twisted about its axis. A pair of recording mediums are mounted at spaced locations on the torsion shaft. On each recording medium is permanently recorded a periodic signal. A pair of reading head are used to detect the signal on one of the recording mediums while a single reading head is employed to detect the signal on the other recording medium. The output signals generated by the reading heads are processed by a microcomputer to derive the torque information and the direction of rotation of the torque shaft.