09-12-2008 11:14 AM
Dear friends,
I need to understand the calculation of motion rate for given line scan rate.
i have line-scan camera connected to servo motor.
i know that the line-scan camera can run at 7.2 khz line rate (7200 lines in 1 second).
Each pixel need to be 0.1mm (in the direction of motion). 10 lines of scanning is 1mm.
i need to scan image of object that its length is 400mm (0.1mm*4000lines)
First, the Conveyor stop, the object that i need to test with the linescan camera is now 5cm from the camera.
i want that the servo motor will move the conveyor for 45cm and stop.
(the conveyor accellerate, move const speed, decellerate, stop. the line scan camera connected to 10khz encoder for each revolution)
Now i'm getting lost with the calculation.....
if 1pixel = 0.1mm , then i need the conveyor belt be able to move 0.1mm for each pulse of the encoder???
i want that the servo motor will rotate chain (like the attached image),
but i dont know how i need to calculate the gear diameter, the chain pitch, etc...
and specially, how this parameters influence the line scan rate, and what is the role of the encoder here...
Thanks for any support.
Moti
09-12-2008 02:33 PM
Discussion continued here:
http://forums.ni.com/ni/board/message?board.id=200&thread.id=20051