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Is there a sensor that will produce a sinusoidal signal phase locked to a high RPM (7000 RPM) shaft? I am attempting to build a coaxial helicopter based on the architecture described in this paper which requires increasing and decreasing drive torque once per revolution, and I would like to do this modulation in hardware.

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Perhaps a hall effect sensor would work for your application? (a) (b) (c)

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It seems like an AC motor connected to the shaft would act as a generator with the frequency of the sine wave matched to the rpm. I'm not sure if this is what you are looking for.

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