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Gill Sensors has produced a video animation detailing how the Blade360 rotary position sensor works. The video covers the fundamentals of induction technology and shows how the sensor uses this principle to detect absolute position.
A metallic target, referred to as the activator, passes over a series of coils mounted within the sensor. By alternately generating magnetic pulses in the coils and measuring differences in response from the activator, its position can be accurately determined.
Source: Web Site