Probability of detection (PoD) of material defects

Early Stage Researcher (ESR) position for investigation of probability of detection (PoD) of material defects

Description: You will express the quality of CT measurements for material defect analysis in terms of probability of detection (POD). This POD depends highly on both the CT set-up (tube voltage and current, prefilter, …) and artefacts like beam hardening or scattering. Whereas the first constitutes rather global quality the latter is local due to local artefacts. You will start with the assessment of the POD for some typical defects in terms of local figures of merit, e.g. SNR, CNR. To establish this correlation a combination of the simulation tool ScorpiusXLab® (developed at Fraunhofer EZRT) and automatic defect inspection software will be used. This will result in a POD-map of the object. Subsequently, you will analyse the impact of artefacts on the POD. The targeted results can be used twofold: first, for a given inspection task, it can facilitate the acquisition strategy by moving the inspection tasks into good POD-regions. Second, the POD-map can be used for a quality dependent inspection software, which uses a

fast algorithm in the good regions and a thorough one in degraded regions. You will highly benefit from the cooperation with ESR 1 (optimal settings) and with other partners (ESR 9 & 12) through mutual secondments in order to validate the developed procedures for actual applications.

Secondments: During this project, you will do a secondment (of a few months) to RWTH (Germany) and Materialise (Belgium)

Duration: 36 months (PhD enrolment not planned, but in principle possible)

Envisaged job starting date: between November, 1st 2013 and March, 31st 2014