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Distance and angle measurement in water and air for visual inspections in radioactive environments
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Ahlberg Cameras is a company that manufactures advanced camera systems and inspection equipment for the nuclear industry.

Every nuclear plant shuts down their reactors approximately every 18 months to perform visual inspections of the vessels to find cracks and other damage.

The company has received a request from Electric Power Research Institute (EPRI) to develop a distance meter that will operate in the reactor vessel, placed in an inspection camera. The device should measure the distance between the camera and an object, and the angle between them. The measurement is performed in air and underwater and the device has therefore a requirement to be waterproof and radiation tolerant.  

This thesis work has studied different possible technologies and technically excluded the ones that are not suitable for the intended application. A large part of the study has been about whether sound or light is a good enough source to use in the different technologies.

The study has excluded to use sound mainly because the reflection back to the receiver at large angles becomes too weak. The choice of technology stands between structured light and a self-designed trigonometry technology, both using lasers. Tests have been made to determine if laser light underwater can be observed by the camera and the results indicates that lasers work well enough for this kind of application.

Further in-depth studies into the sources of errors and measurement accuracy are needed for determining which of the two technologies is the most suitable.

Place, publisher, year, edition, pages
2016. , p. 45
Series
UPTEC E, ISSN 1654-7616 ; 16 008
Keyword [en]
Distance measurement, ToF, Structured light, ultrasound, laser
National Category
Electrical Engineering, Electronic Engineering, Information Engineering Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-310672OAI: oai:DiVA.org:uu-310672DiVA, id: diva2:1057421
External cooperation
Ahlberg Cameras
Educational program
Master Programme in Electrical Engineering
Supervisors
Examiners
Available from: 2016-12-19 Created: 2016-12-18 Last updated: 2016-12-19Bibliographically approved

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CiteExportLink to record
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