1 mm ? Is that an accuracy requirement, or is it the minimum distance requirement ?Thank you for reply,
Dear, the sensor should sense distance of min. 1 milimeter and max 4 meter or max 4m meter not necessary 1 meter max is ok.
This will not be feasible or practical for the OP. Try not to misguide, and instead try to give recommendations in keeping with the spirit & level of the asker.As .....pulse laser with some finite time and and detect the counts for known distance for finite period then you can use the same logic for change in distance.... Good Luck
It's not wrong per se, imho it's just a little too vague on quite complex issues which are very casually mentioned. Light travels a distance of 1 meter in around 3.3 nS.... distance measurement where reflective target movement time is greater than the detection time where detector and reflective target must be in single direction and beam receive path must be maintained ...