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real time speed measurement

Hi,

 

i am trying to meaure the speed of a motor . I have angular encoders attached to it and hence i get angle data..

 i am trying to convert it to speed by derivative method but theres too much noise being added in...

i tried using filters( lowpass butterworth) to filter the noise out , still theres too much noise.. and plus an offset gain by the filter..

 all of these are in labview 8.5 and in real time..

Any other way to measure speed???

any speed sensors anybody know??

 or any documents related to working with LV real time for matters similar??

I dont really understand working with LVRT either...

 

please if any suggestions???

 

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Duplicate post the active thread can be found here.
Sincerely,
Jason Daming
Applications Engineer
National Instruments
http://www.ni.com/support
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