Conveying systems for oil and gas, operated in the sea have many important underwater components. The maintenance of such components is elaborate and expensive, as measuring them is complicated. Fraunhofer researchers are presenting a compact 3D measurement system at the trade fair in Hannover.
The maintenance of underwater technical systems is elaborate and expensive. Pipes, flanges and connections of conveying systems for oil and gas at sea, for example, must first be measured for this purpose. The measurements serve to correctly assess the extent of damage – caused by corrosion, for instance, or by other defects – and to initiate suitable repair interventions.
The Fraunhofer Institute for Applied Optics and Precision Engineering IOF in Jena is presenting a system at the Hannover trade fair from April 13 to 17 (Hall 13, Booth E26), which measures underwater components and provides this information as 3D data.
The sensor and camera technology has approximately the size of a shoe box and can be held by a diver just like an underwater camera. It is currently designed for use at a water depth up to 40 meters. The prototype was created within an international research project together with the 4h JENA engineering GmbH and the Norwegian Research Institute Christian Michelsen Research (CMR).
The Thuringia Landesentwicklungsgesellschaft (state development company) was the promoter. »In the next step we want to optimize the 3D measurement system for greater depths and broader underwater application fields«, says Dr. Peter Kühmstedt, scientist at the IOF.
New 3D system: small, lightweight and extremely robust
During the project, the IOF was responsible for making 3D measurement technology suitable for underwater use. The highlight: The scientists managed to accommodate the entire control system and electronics as well as the computer and display technology in a very confined space:
»The system is no larger than 20 cubic decimeters and weighs less than 11 kilograms«, says Kühmstedt. Despite its complex technology it must still be easy to operate, because divers are limited in their movements by the water and their equipment. The researchers have adapted the operating and representation software of the system to guarantee this: Only a few buttons go outwards. The temperature is constantly monitored to keep the device mechanically and thermally stable, because under water, temperatures may fluctuate immensely depending on depth and sea current. Light conditions also differ from those on land:
There are optical refractions at the interface between the device and the water. A special calibration strategy for the measurements compensates for that. A further drawback: In the water, everything runs via wires and not via radio – therefore the scientists have to design the cables in a very compact manner.
»Under water, things are ten times more expensive. It is a large cost aspect for energy and raw material conveying companies to have their systems maintained at sea. The problem: The technologies currently available for the measurement of components are either too slow or too far away from the actual application. This is why we have developed this prototype together with the industry«, says Kühmstedt. 4h JENA engineering was responsible for the development of the housing and the system cladding, and CMR for the integration of additional sensors.
The 3D measurement system successively depicts several striped patterns onto the surface of the component to be examined by means of a projector, while at the same time taking pictures of the object are taken with two cameras. Based on the series of stereo photos taken and on the active pattern structure seen on the surface, the technology is able to exactly determine the shape of the object.
The diver needs 0.2 seconds for each 3D scan and can check under water whether they are usable. Once back on land or on the ship, he can then load the data to a computer, which evaluates the information and makes suggestions for possible repair measures. »For example it can be decided whether the rust has corroded too deeply or if the defect in the pipe presents a problem or not«, says Kühmstedt.
Dr. Kevin Füchsel | Fraunhofer Research News
Artificial hand able to respond sensitively thanks to muscles made from smart metal wires
24.03.2015 | Universität des Saarlandes
Greater productivity in industry thanks to digitalization
26.02.2015 | Siemens AG
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Hitzewellen in der Arktis, längere Vegetationsperioden in Europa, schwere Überschwemmungen in Westafrika – mit Hilfe des deutsch-französischen Satelliten MERLIN wollen Wissenschaftler ab 2021 die Emissionen des Treibhausgases Methan auf der Erde erforschen. Möglich macht das ein neues robustes Lasersystem des Fraunhofer-Instituts für Lasertechnologie ILT in Aachen, das eine bisher unerreichte Messgenauigkeit erzielt.
Methan entsteht unter anderem bei Fäulnisprozessen. Es ist 25-mal wirksamer als das klimaschädliche Kohlendioxid, kommt in der Erdatmosphäre aber lange nicht...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Die Europäische Weltraumagentur ESA gab heute grünes Licht für die industrielle Produktion von PLATO, der grössten europäischen wissenschaftlichen Mission zu Exoplaneten. Partner dieser Mission sind die Universitäten Bern und Genf.
Die Europäische Weltraumagentur ESA lanciert heute PLATO (PLAnetary Transits and Oscillation of stars), die grösste europäische wissenschaftliche Mission zur...
23.06.2017 | Veranstaltungen
22.06.2017 | Veranstaltungen
22.06.2017 | Veranstaltungen
23.06.2017 | Physik Astronomie
23.06.2017 | Ökologie Umwelt- Naturschutz
23.06.2017 | Materialwissenschaften