which is more suitable for quality inspection: lase scanner

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drobzz
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Re: which is more suitable for quality inspection: lase scan

Post by drobzz » Thu Apr 14, 2011 9:43 am

And I beg for somebady tell me the difference bettwen lase scanner and white light scanner in applications .
May be you mean Pulse Based Scanners and Phase Based Scanners?

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Matt Young
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Re: which is more suitable for quality inspection: lase scan

Post by Matt Young » Thu Apr 14, 2011 10:05 am

White light Scanning

Fringe patterns are projected onto the object's surface with a white light projection and are recorded by two cameras. The system self-dependently checks its calibration and the influence of the ambient conditions.

Pulse scanning or Time Of Flight

Measurement of the time it takes light to reach and return from a surface.

Phase Comparison scanning

Measurement in the difference in phase modulation.

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Re: which is more suitable for quality inspection: lase scan

Post by Oliver Buerkler » Thu Apr 14, 2011 10:32 am

Hi.

Giving you a globally true statement is very difficult I think.

Both technologies have their pros and cons.

If you could provide more detailed description on the parts you want to measure, I am sure there would be members here who could give you more specific answers.

PS:
Technology-wise in Matts previous posting the laser triangulation was missing. That is what most of the hand-held scanners are using.

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Re: which is more suitable for quality inspection: lase scan

Post by Joe Parsons » Thu Apr 14, 2011 12:05 pm

Hi Hugo, I'll have a go at a basic explanation. if you are looking at inspection applications of 3d scanning (presumabley for small engineering parts) you will need a Close range scanner these can be both white / structured light or triangluation based laserscannng. Phase based and time of flight scanners are not accurate enough to record sub-millimeter accuracy...yet

White / Structred light scanners work by projecting a grid of light onto the surface of the object, this is recorded by a camera or cameras and the deviation / change of the gird is used to calculate 3d measurment points from the surface.

Triangulation based laser scanners work by projecting a strip of laser light onto the surface of the object, this is recorded by a camera set at a specific angle (ie triangulation) and 3d measurement points are calculated along the stripe.

The process is repeated for both systems until a ful image of the part is created.

Typically both types of scanner will record data to sub-millimetre level and accuracy. If your looking to buy one look at the resolution of the system (ie minimum distance between measurment) and the accuracy of these points.

Hope this helps.
Joe

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Re: which is more suitable for quality inspection: lase scan

Post by michaeltroest » Fri Apr 15, 2011 8:44 am

I have done quality inspection for almost ten years now, with both types of scanners. Imo it depends on the job, most importantly what precession you are looking for, and the size and surface of the object. White light scanners tend to make cleaner data, so you need less time cleaning and closing data - but you need more scans than with laser, so you spend more time scanning. White light is no good in the sun, and generally have more trouble with some types of surfaces than laser scanning. So there is no single right answer - the right choice depends on what you need to scan.

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