3
$\begingroup$

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.

$\endgroup$
  • $\begingroup$ If all you need is angular velocity, a gyroscope is ideal. If you need angular position as well, use a gyroscope + accelerometer + complementary filter. $\endgroup$ – Paul Jul 12 at 3:22
  • $\begingroup$ 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... $\endgroup$ – Solar Mike Jul 12 at 6:54
  • $\begingroup$ Any reason you can't measure position (using a potentiometer or similar) and differentiate? $\endgroup$ – welf Jul 17 at 0:43
2
$\begingroup$

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/]

1 [enter image description here]2

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.