Compare UniScan to MultiScan Measurements

Compare UniScan and MultiScan Measurements

Can UniScan and MultiScan Result In Different Numbers?

Yes – they can give different numbers for tube measurements. This is because UniScan and MultiScan cover different parts of the surface on the same straight. See the different sections below to understand why.

UniScan Measurements

VTube-LASER UniScan measurements take one group of evenly spaced laser stripes along the profile of each straight cylinder. These stripes each contain points. The method used with UniScan is similar to spray painting. The Best Way to Calculate the Centerline UniScan is the best way to get to a true centerline average - especially for deformed diameters in straights. The reason is because UniScan averages out the entire surface of the straight measured. And when VTube-LASER operators use wide-scanning techniques, then there is no better way to get to the truth of the centerline placement. Compared to Fork Probe Method Methods that use fork proves take very limited data on the surface (like fork probes with two crossing infrared beams. Examples are the 6-axis tube probe systems from HEXAGON. Compared to Silouette Method Methods that use tube edge are "silouette" measuring centers. Examples are like the Eaton Leonard LASERVISION and the AICON TubeInspect system. These systems only look at the edge of the diameter and cannot use that data to calculate the same data that VTube-LASER can in its Cylinder Fit window.

MultiScan Measurements

MultiScan only measures near the tangents of a straight. (The tangents are the locations on the straights where the straights and bends meet.) MultiScan measurements are usually reserved for straights that are bowed - like in brake lines with long straights. For those kinds of tubes it is often the case that MultiScan is the only way to solve for a centerline. (UniScan would reject those kinds of straights using its default tolerances.)

MTA Measurements

MTA (Measured Tube Averaging), combined with UniScan measuring, is the the best type of measuring available in VTube-LASER. MTA allows you to measure multiple sides of the same tube, then average the results into a single final tube shape. Read the details for MTA here: VTube-LASER MTA (Measured Tube Averaging)

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