| 摘要 |
A position sensor (214) comprising at least two coils (228) of elongate electrically conductive material which are spaced apart from one another, or which diverge from one another in the sense that their respective axes are at an angle to one another and respective portions of the coils are substantially contiguous. The position sensor (214) further comprises an actuator portion (200) of electrically conductive material arranged to be moved within a region which is within or adjacent to the said at least two coils (228). Pulse inductive circuitry (960, 962, 963) is connected to the said at least two coils (228) to provide respective signals having respective values, each indicative of the position of the actuator portion (200) relative to the respective one of the said at least two coils (228). The pulse inductive circuitry (960, 962, 963) is constructed to provide a signal having a value obtained substantially by dividing the difference between the said respective values by the sum of the said respective values.
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