| 摘要 |
A transducer includes a winding in a magnetic circuit including a magnet, a pole-piece and a disc which has pairs of protuberances in its periphery, each pair being connected by a web of lesser radial distance from the disc axis than the peaks of the protuberances. The winding is connected in a discriminating circuit including an integrator which integrates the winding output, and a zero crossing detector. An output circuit receives signals from the integrator and the zero crossing detector and produces an output signal for the whole period during which the web between two protuberances is passing the pole piece.
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