Messverfahren und Anordnung zur Bestimmung von Laengen mittels induktiver Felder

摘要

1,262,664. Measuring length electrically; measuring magnetic field strength. G. ALICH. Feb. 28, 1969, No. 10923/69. Heading G1N. The distance between two ferromagnetic rolls 1, 4 Fig. 2 is determined by producing a magnetic flux 11 in the space between the rolls, whose intensity is measured by magnetic resistive semiconductor elements 101, 1011 , and is indicative of the length of the space. The flux 11 is produced by an energized winding 9 on a core assembly 8 in contact with the rolls 1, 4 via poles 81 , 811. The resistance of the elements 101 , 1011 is compared in a bridge circuit 13 with that of two similar elements 121, 1211 located in the field produced by a winding 16 whose energizing current via is adjusted to balance the bridge. The probes 101 , 1011 are located symmetrically with respect to the axial plane of the rolls 1, 4 so that small lateral displacements produce differential effects on their resistances and are thus automatically compensated. The probes 101, 1011 are mounted on a carrier 17 Fig. 5 with spring fork arms embracing the two rolls to make the carrier and the probes follow lateral displacements of the rolls relative to each other. The carrier 17 may incorporate a temperature sensitive resistor to compare the temperature with that of the other magnetic core 15. In another embodiment Fig. 9, the thickness of a non-magnetic wire or tape P is measured by its effect on the flux density in the gap between poles 341, 35, as sensed by the probe 10, and compared with the flux density sensed by probe 12 in a similar arrangement with a standardized gap. The exciting windings for the two magnetic circuits are connected in series.