| 摘要 |
943,967. Hall-effect transducers. AGFA A.G. May 3,1960 [May 20, 1959], No. 15611/60. Heading G1N. A transducer for measuring force or displacement by means of the Hall effect comprises a double magnet having equal and opposite fluxes in the pole gap but a resultant flux in a particular direction outside the gap, and a Hall effect member movable in this direction to develop a potential representative of its displacement from the neutral position. In Fig. 1 a double electromagnet produces equal and opposite fluxes in a polepiece P 1 , and the Hall member B develops zero potential when symmetrically disposed relative to two other polepieces P 2 and P 3 at right angles to P 1 . The Hall member can be placed in the diagonal of a manually rebalanced D.C. or A.C. bridge (Figs 2a and 2b, not shown). Alternatively (Fig. 3), the Hall member HG produces an output which is amplified and applied to a servomotor M which rebalances the bridge at P b . For measuring a force K 1 (Fig. 4), the amplified output from the Hall member HG energizes a servomotor M which rotates a screw S g to apply an opposing force to a displaceable plate P t by means of a spring F. The magnitude of the force is read on a scale S k , to which an inkrecorder can be attached. |
