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I'm looking to measure the angular velocity of an arm as it moves. It seems to be a difficult thing to research, since the term 'angular velocity/frequency' is usually reserved for other areas of circuit analysis.

I imagine something like a tachometer or a generator is most practical, but I can't find anything dealing with an incomplete rotation (i.e. about 90-120 degrees). Any help or push in the right direction would be greatly appreciated.

Colin
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  • If all you need is angular velocity, a gyroscope is ideal. If you need angular position as well, use a gyroscope + accelerometer + complementary filter. – Paul Jul 12 '19 at 03:22
  • Think of the reluctor ring used for abs on cars - 12 or more teeth which gives the resolution of the partial rotation of the shaft. For 90 degrees you would get 3 pulses, depending on the start point. You could consider two 12 tooth rings offset... – Solar Mike Jul 12 '19 at 06:54
  • Any reason you can't measure position (using a potentiometer or similar) and differentiate? – welf Jul 17 '19 at 00:43

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I'd use a video camera and attach a striped pattern to form a moire pattern which is easy to see in the video. Here's a link: [http://www.unappel.ch/people/emin-gabrielyan/public/070804-multi-ring-moire-indicator/]

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D Duck
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