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Particle analysis of contaminated camera sensors
Linköping University, Department of Physics, Chemistry and Biology.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Veoneer is a company developing automotive safety systems. More specifically, they develop vision systems with the aim to save more lives in traffic. All vision systems need a camera module to capture images. The camera module includes a camera sensor with a sensitive pixel surface. The pixels located at the sensor surface collect light that is used to create an image. Therefore, the sensor surface needs to be free from particles before it is attached to the rest of the camera module. For this reason, the assembly of the camera module takes part inside a cleanroom with a controlled number of particles in circulation. However, some particles end up on the sensor surfaces despite the cleanroom environment. This thesis uses material-science analysis methods including Scanning Electron Microscopy and Energy-Dispersive X-ray Spectroscopy to identify and evaluate the source of the contaminating particles. Most of the analyzed particles had similar shape and elemental characteristics, corresponding to an aluminum alloy including magnesium. This specific composition was further evaluated and the study showed that it matched the composition of the adapter plates, a part of the equipment used for transporting the camera sensors inside the cleanroom. The handling of the adapter plates was examined and a few changes were made in the production. These changes resulted in fewer contaminated sensors which confirmed the predicted connection between the sensor particles and the adapter plates. 

Place, publisher, year, edition, pages
2018. , p. 53
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Identifiers
URN: urn:nbn:se:liu:diva-148970ISRN: LITH-IFM-A-EX—18/3562—SEOAI: oai:DiVA.org:liu-148970DiVA, id: diva2:1222975
External cooperation
Veoneer
Subject / course
Physics
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Available from: 2018-06-26 Created: 2018-06-24 Last updated: 2018-12-19Bibliographically approved

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