3d Laser Scanner

In the dimensional measurement world and indeed the industry of reverse engineering, 3-D laser scanning is becoming the benchmark for both inspection, and digitizing.

3-D laser scanners come in the following categories:

• Handheld scanners - The advantage of this type of scanner is ease-of-use and portability. The disadvantages however, are poor accuracy and repeatability (generally above 100 µ and more). Due to lack of reference mechanical or otherwise, software is relied upon to stitch surfaces together generally on non-radical surfaces- this then results in poor performance.
• Arm mounted scanner - There are many positives to this type of product, particularly the Romer system. Accuracy is generally within the 60 to 100 µ range. The arm can also be used to probe, allowing for data to be measured in a tactile fashion then proceed with the scanner. Disadvantages are price; between $75,000 and $130,000 including software and scanner as well as limited measuring range (usually within 8 to 10 feet) before having to reposition.
• Optical tracker mounted scanners - Advantages include the freedom to move unhindered within the measuring range of the optical tracker. The precision of an arm mounted scanner can also be expected. Disadvantages are precision can only be maintained while operating in the sweet spot of the measuring area. Because these units are optical the actual measuring perimeter is within 30° or so of the camera system. This means that it becomes more restrictive to measure the closer you get to the camera, and less accurate the further you are away from the camera. These systems give a false sense of security and generally speaking provide inconsistent results unless the operator is very careful.
• Laser tracker mounted scanners – Advantages are that literally an unrestricted scanning area is presented to the operator. Because these units are laser optical in nature, they provide excellent benchmark accuracy over a complete range. In fact, the Leica tracker competes directly with a coordinate measuring machine in terms of accuracy and repeatability. Disadvantage, price - over $300,000.
• Coordinate measuring machine mounted scanners - Advantages are they are by far the most accurate of laser scanners as they are mounted on an extremely precise coordinate measurement frame. Disadvantages are the scanning size is restricted to the size of the coordinate measuring machines volume.

Canadian Measurement-Metrology Inc. has the capability and expertise to utilize any of the above systems, not only do we employ them in our measurement services group but we also demonstrate and sell these products. We have the ability to inspect and scan all of your components, whether in your plant or in our facility. If a purchase is a possibility then we will demonstrate any of the products reviewed above.