One of Anko's comprehensive service offers is 3D-laserscan. It constitutes an important complement to traditional surveying because a scanner has the ability to map larger areas with very high accuracy. With modern equipment, we can scan smaller objects, such as small machine parts, which may require an accuracy of one hundredth of a millimeter.
Anko AS can tailor its survey assignments with the 3D-laserscanning service, and scanning is currently being used on a number of different assignments.
Examples of this may be mapping of tunnels, construction pits, excavation, etc. The equipment used for this is an Leica P40 ScanStation.
This is a 3D scanner that can be used to scan parts from approx. 20 millimeters and up to 3-4 meters across. The software used with this scanner automatically generates a 3D triangle model immediately after a scan is made. For this to function, a number of reference points are attached to the part in question, prior to the scan itself.
When scanning large parts, a photogrammetry system is used to establish known coordinates on these reference points. We also generate a data set, where the scanned part is compared to the theoretical model. Using this data set, the customer can easily view the result and get an overview of deviations where this is desirable. The use of data sets does not require installation of software on our customer's computers.
An example of how this advanced equipment is used, is scanning two objects, such as couplings, that are to be screwed together and be watertight. It requires a strict precision and demands high resilience. Other examples of component objects are: car parts, flanges, machine parts, prototypes, and molded elements.
3D scanning consists of the company's representative collecting so-called 3D point clouds. This is done "in the field".
A point cloud can be explained as such: the instrument used automatically measures angles and distances to all objects in a 360 degree rotation. Based on measured distances and angles to the surroundings, millions of points are calculated where each point receives a coordinate consisting of a north, east and elevation value.
Anko AS is up to date on scanner equipment and currently uses a Leica P40 ScanStation. The scanner has a range of 270 meters and can be used for "all you need to document".
Reverse engineering is a working technique with a basis in a finished product; we scan each part and analyze, and from this outline we develop detailed drawings or models. The name implies the reversed order of how an engineer usually works.
Leica P40 ScanStation:
The scanner can scan up to 1 million points per second at maximum resolution. A 360 degree scan at this resolution takes approx. 1 hour 50 minutes. Normal resolution, in most cases sufficient, corresponds to a point density at a distance of 10m = 6x6 millimeters. A scan at this resolution is made in 1 minute 40 seconds. The scanner can also take pictures to give the point cloud colours corresponding to the surroundings. Images increase the scan time of each station by between 7 and 10 minutes (10 min for HDR images).
* A point cloud will contain everything that the scanner "sees" within its reach. This also means that all objects and surroundings around a specific object will be scanned.
* If a client later needs more objects than those that were first requested, this can be retrieved from the point cloud without having to do the fieldwork again.