I have to calculate the maximum shaft speed possible to maintain measurement reliability

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RsK's Avatar (by Gravatar)RsK posted on
November 6, 2006, 5:49 pm
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if a  photodiode with a rise time of 10 micro sec is used to detect the
light modulation through an optical encoder disk with 1000 lines on it.
how i can calculate the maximum shaft speed possible to maintain
measurement reliability. Assuming that the minimum output swing
required for the reliable operation of the circuit is 20% of the full
output.?


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Curt Welch's Avatar (by Gravatar)Curt Welch posted on
November 6, 2006, 11:50 pm
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Re: I have to calculate the maximum shaft speed possible to maintain measurement reliability


You estimate how long the photodiode will take to rise 20% and then
calculate how fast the wheel must be spinning to allow the window to be
open for that long for each slot.  Isn't this obvious?  Are you trying to
get us to do your homework for you?

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Curt Welch                                            http://CurtWelch.Com/
curt@kcwc.com                                        http://NewsReader.Com/

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e c kern's Avatar (by Gravatar)e c kern posted on
November 6, 2006, 11:58 pm
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Re: I have to calculate the maximum shaft speed possible to maintain measurement reliability


Actually, it would seem he has succeeded.

Here's the next problem:
http://groups-beta.google.com/group/sci.engr.control/browse_frm/thread/2409b4af71d38a81/7e95b140312626af

-chris



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