Importance

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Abstract

The device comprises a shaft to which is applied a torque to be measured. The shaft is mounted in two ball bearings which are secured in a pair of supports coupled by a cylindrical metallic piece forming a shield against electromagnetic influences from the outside. Concentric disks facing each other and at close proximity from each other are secured by means of connecting tubes respectively to each extremity of the shaft. Each disk comprises non transparent sectors for electromagnetic waves separated by transparent sectors, the sectors being arranged in a regular angular configuration on the disks. The relative angular position of the disks is such that in the absence of a torque applied to the shaft, the non transparent sectors of one disk and the transparent sectors of the other disk overlap. The disks form a shielding element the effect of which being variable in dependence on their relative angular position. Transmitting and receiving coils separated by the disks are provided in the supports at close proximity of the disks. The transmitting coil receives a constant high frequency current from a generator and the signal induced in the receiving coil is detected, this signal being dependent on the variable shielding effect of the disks.

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First Claim