Use this URL to cite or link to this record in EThOS:
Title: Portable atom interferometry : investigation on magnetic shielding techniques for compact quantum sensors
Author: Voulazeris, Georgios
ISNI:       0000 0004 7426 1027
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2018
Availability of Full Text:
Access from EThOS:
Access from Institution:
Focus of this thesis are the magnetic shielding aspects of a mobile atom interferometer, developed under the Gravity Gradient Technologies and Opportunities Programme (GGtop). This system has been used as a test bed for new compact technologies with the aim to perform outdoor gravity gradient measurements. A finite element analysis model was used for optimising magnetic shielding design, aiming to reach a field attenuation factor of the order of 103, by mu-metal. The research was extended to alternative shielding techniques with the intention to push current technology towards next generation portable atomic sensors. Initially, Metglas foil was used to create lightweight cylindrical shielding housings. The performance goal was approached by a total of 37 foil wrappings around two coaxial cylinders. However, material inhomogeneities affected the magnetic field uniformity. The second approach exploits additive manufacturing of permalloy-80 for 3D-printing compact shielding structures. Process optimisation was undertaken by fabricating approximately 70 small bulk samples under different printing parameters, while 6 cylindrical shield prototypes were produced for preliminary shielding tests. Application of post heat treatments enhanced shielding effectiveness by a factor of up to ~ 15, indicating that a performance closer to mu-metal could potentially be reached by further process optimisation.
Supervisor: Not available Sponsor: European Commission Seventh Framework Programme
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics ; TN Mining engineering. Metallurgy