The Use Of 3d Scanners For Large Scale Objects

When scanning large objects, these devices save a company time and money by implementing

as-built CAD models and comprehensive inspection data into their process. They truly take the challenge out of these complicated scanning projects.

3D scanners are the tool of choice for a variety of measurement tasks of large and bulky objects. They can be used in reverse engineering for highly accurate 3D modeling and the reconstruction of just about any type of surface. They can also perform maintenance and repair functions and help in the development of tooling.

Combining photogrammetry with 3D laser scanning, engineers have unparalleled accuracy and point density in the measurement of large objects. The 3D scanning process utilizes the following components:

A high-resolution DSLR camera

Scale bars

An origin reference cross

Registration markers

Coded targets

To perform a 3D scanner measurement, engineers place registration markers on the object. The markers have a specific diameter that the scanning software recognizes. They will become the foundation for the scanned data alignment.

Next, the scale bars are placed either on or in close proximity to the part that is to be scanned. Then the origin reference cross is placed near the object, and finally the registration markers are placed around the target object.

Technicians take photographs of the object at multiple angles, making sure that all the markers and targets are captured. The photos are uploaded to the photogrammetry software. This software accurately calculates the center points of each marker in 3D space.

The 3D points are loaded into the 3D scanner software, then the technician removes the scale bars and coded targets. Now the high resolution 3D scanning process can begin. As each scan is taken, it is automatically aligned to the 3D points that were generated using the photogrammetry system.

The data produced contains millions of measurement points, each of them accurate to within a few thousandths of an inch taken on all surfaces of the large object.

The technology in 3D scanners lets users re-create a wide range of large shapes, which is particularly useful when performing prototyping and reverse engineering tasks. The scanners are able to perfectly see virtually any type of surface and provide accurate data quickly.

To sum up, 3D scanners are the tool of choice when engineers need to measure very large objects such as aircraft, boats and buildings. These instruments are versatile, powerful and accurate and are used across many industries for many different types of measuring tasks. It would be impossible to assemble the necessary data on these large objects without 3D laser scanning technology.

by: Julie R. Randall

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