| 摘要 |
A position sensor for producing a variable electrical output signal in response to manipulation of a quadrant lever or the like. A pair of tubes of equal length made of magnetically saturable material are secured to a frame in parallel proximity to a sheet-like permanent magnet which is mounted on a carrier. The magnet has a pair of active angled edges and the tubes are oriented to transversely intersect the respective angled edges, being so spaced from one another that the tubes are magnetically saturated over complementary fractions of their length. Each tube is engaged by at least one turn of wire and a detector circuit is provided having its input connected to the turns of wire for producing an electrical output signal in accordance with the differential magnetic saturation of the tubes. Each tube is angled generally transversely with respect to the direction of relative movement. In addition the presented edges of the magnet are angled at such acute angle with respect to the direction of relative movement that, upon such movement the tubes are respectively engaged by successive portions of the angled edges, so that one of the tubes is progressively more saturated in its longitudinal dimension while the remaining tube is progressively less saturated, with the degree of saturation of the tubes in the longitudinal dimension remaining substantially complementary over the range of relative movement. The acute angle is sufficiently shallow so that the range of relative movement substantially exceeds the length dimension of the tubes. The magnet has a reference position with respect to the tubes in which each tube is saturated over such portion of its longitudinal dimension as will result in a zero output signal at the reference position.
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