vision

[Balajikeee]

Hi, Can any one tell like, which camera will be useful for me, please find the requirement below,

Hole diameter measurement, Size 160 * 160 mm

Thickness 5mm,

The composite plate has more than 6 holes spreaded over it and we need to measure the hole daimeter. we are looking at 50 Micron accuracy..

[AdnanZ]

The Basler Ace cameras should work well. What sort of resolution, fps are you looking for?

[another_novice]

"Accuracy" is a rather ambiguous term. I suspect you mean repeatability, meaning that you want to get the same result, within 0.050mm, every time to you make the same measurement on the same hole.

The way I would approach this is by saying that you need at least three pixels to span your tolerance band. (Some folks will argue you need more, others will say you can get away with less thanks to subpixel interpolation.) But if three pixels spans 0.050mm, then one pixel needs to span roughly 0.015mm. If the object you are viewing is 160mm square you need 160/0.015 = 10,667 pixels to cover that distance. That gives you the raw resolution you need from your system. Unfortunately I don't think you are going to find an area camera with that kind of resolution, so you may need to explore linescan (which means engineering relative motion between target and camera.) A 12k pixel linescan camera would do the job.

Another issue you will need to consider is calibration. You will have to 'show' the camera a calibration target so images can be corrected for optical distortion and pixels converted to millimeters.

Hope this helps!

[CarlosOtiniano]

if still not solved the problem you can measure distance passing an RGB image to 8bit and extract a color plane insert VERTICAL CLAMP IMAQ function MIN which will measure the minimum height of the piece analyzed, this function block can be located within the MACHINE VISION path / MEASURE DISTANCES

[CarlosOtiniano]

obtain information on the position of the internal coordinates of the piece, we proceed to measure the distance between these points by applying a function IMAQ POINT DISTANCES, we adjust the measured value and write it on the front panel, on the other hand by using the IMAQ OVERLAY TEXT write the distance obtained from the piece on the real-time image