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You searched for subject:(Electromagnetic characterisation). Showing records 1 – 2 of 2 total matches.

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University of Bradford

1. Harris, Jane C. Pieces of a puzzle : fitting electromagnetic induction into geophysical strategies to produce enhanced archaeological characterisation.

Degree: PhD, 2016, University of Bradford

Electromagnetic induction (EM) methods have been utilised in a recent surge of archaeological applications across continental Europe, Ireland and Scandinavia. Development of multi-exploration depth instruments and improvements to instrument stability have improved its reputation as an effective method for mapping archaeological remains. Despite these advances, EM methods are comparatively lacking in rigour when for British sites. Through a structured scheme of experimental analysis and fieldwork, this thesis develops an understanding of the responses of EM instruments over a range of British archaeology, including earthworks, field systems, burials, modern remains, and a Cistercian abbey; the results of which demonstrate its effective over a diversity of environments. The impact of instrument-based issues on the collected measurements was quantified through a scheme of experiments targeting instrument drift, calibration and elevation. Dedicated instrument operation and processing workflows were developed based on the collective field and experimental results, which recommend best practice guidelines for improving the quality and accuracy of collected data. The link between instrument measurements and buried archaeology was further developed through a structured analysis of the EM datasets with complementary earth resistance and magnetic results. The integration of the EM, earth resistance and magnetic datasets was utilised to develop an enhanced archaeological characterisation of subsurface features. While the earth resistance and magnetic methods generally responded to different aspects of the buried archaeology, the EM surveys were able to detect a range of responses evident in the results of the former methods. Therefore, the role of EM methods within this characterisation are shown to “bridge the gap” between the earth resistance and magnetic methods, while providing a comprehensive characterisation of the remains in their own right.

Subjects/Keywords: Geophysics; Archaeology; Earth resistance; Magnetometry; Archaeological geophysics; Data combination; Characterisation; Electromagnetic induction (EM)

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Harris, J. C. (2016). Pieces of a puzzle : fitting electromagnetic induction into geophysical strategies to produce enhanced archaeological characterisation. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/15743

Chicago Manual of Style (16th Edition):

Harris, Jane C. “Pieces of a puzzle : fitting electromagnetic induction into geophysical strategies to produce enhanced archaeological characterisation.” 2016. Doctoral Dissertation, University of Bradford. Accessed June 25, 2019. http://hdl.handle.net/10454/15743.

MLA Handbook (7th Edition):

Harris, Jane C. “Pieces of a puzzle : fitting electromagnetic induction into geophysical strategies to produce enhanced archaeological characterisation.” 2016. Web. 25 Jun 2019.

Vancouver:

Harris JC. Pieces of a puzzle : fitting electromagnetic induction into geophysical strategies to produce enhanced archaeological characterisation. [Internet] [Doctoral dissertation]. University of Bradford; 2016. [cited 2019 Jun 25]. Available from: http://hdl.handle.net/10454/15743.

Council of Science Editors:

Harris JC. Pieces of a puzzle : fitting electromagnetic induction into geophysical strategies to produce enhanced archaeological characterisation. [Doctoral Dissertation]. University of Bradford; 2016. Available from: http://hdl.handle.net/10454/15743

2. Yasri, Maria. Capteur de corrosion passif et sans contact : Passive wireless sensor for corrosion monitoring.

Degree: Docteur es, Matériaux et micro-ondes, 2016, Brest

Cette thèse a porté sur la conception d'un capteur de corrosion passif, sans contact de moyenne portée. Les solutions existantes sans fil concernent soit des capteurs à architecture classique, soit des solutions passives. Dans le premier cas, le capteur de corrosion est actif et peut être interrogé à longue portée. Dans le second cas, les solutions passives existantes ne fonctionnent qu’avec des distances de lecture de quelques centimètres du fait des basses fréquences utilisées. L’objectif de ce travail était de répondre à ce besoin. Pour cela, nous nous sommes inspirés de la technologie RFID (Radio Frequency Identification) passive chipless pour le développement d’un capteur basé sur une fonction hyperfréquence. La première structure réalisée a été une ligne microruban, dont le ruban est constitué d’une couche mince d’un élément sensible à la corrosion. Dans ce cas, la corrosion de la ligne s’est traduite par une variation d’amplitude du fait de l’apparition de pertes expliquées principalement par l’effet de peau ou la création de défauts. Une deuxième structure hyperfréquence a été élaborée en se basant sur un stub (circuit ouvert) qui a permis de suivre le processus de la corrosion via une variation de fréquence. Comme le cas de la ligne microruban, cette structure nous a permis de distinguer la corrosion uniforme et la corrosion localisée. Grâce à la mise en évidence de ces fonctionnalités, diverses stratégies de contrôle de la corrosion peuvent être imaginées et un démonstrateur a été réalisé. Le point clé du démonstrateur proposé est une augmentation de la distance de lecture dans la technologie RFID chipless, ceci a été rendu possible en considérant l’isolation Tx / Rx du lecteur. Dans ce contexte, trois types d’antennes ont été étudiées. Afin d’augmenter encore la distance de lecture, d’autres techniques d’isolation ont été proposées : l’utilisation d’un déphaseur mais aussi l’isolation temporelle par l’utilisation d’une ligne à retard SAW. Grâce à ces 2 méthodes, une distance de lecture de deux mètres a été obtenue. Suite aux caractérisations RF des métaux soumis à la corrosion discutées, nous avons aussi élaboré une sonde RF à champ proche permettant de diagnostiquer la corrosion de surfaces métalliques.

This thesis focused on the design of a passive wireless corrosion sensor. Existing wireless solutions concern either classic architecture sensors or passive solutions. In the first case, the corrosion sensor is active and can be interrogated at long range. In the second case, the existing passive solutions only work with reading distances of a few centimeters because of the low frequencies. The objective of this study was to respond to this need. That’s why; we were inspired by the RFID( Radio Frequency Identification) passive chipless technology for the development of a sensor based on a microwave function. The first structure was a microstrip line, of which the strip is composed of a thin layer of an element sensitive to corrosion. In this case, the corrosion of the line is proven by an amplitude…

Advisors/Committee Members: Rioual, Stéphane (thesis director), Gallée, François (thesis director).

Subjects/Keywords: Capteur de corrosion; Caractérisation électromagnétique; Corrosion uniforme; Corrosion localisée; Corrosion sensor; Electromagnetic characterisation; Uniform corrosion; Localised corrosion; 537.534 4; 620.112 23

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Yasri, M. (2016). Capteur de corrosion passif et sans contact : Passive wireless sensor for corrosion monitoring. (Doctoral Dissertation). Brest. Retrieved from http://www.theses.fr/2016BRES0006

Chicago Manual of Style (16th Edition):

Yasri, Maria. “Capteur de corrosion passif et sans contact : Passive wireless sensor for corrosion monitoring.” 2016. Doctoral Dissertation, Brest. Accessed June 25, 2019. http://www.theses.fr/2016BRES0006.

MLA Handbook (7th Edition):

Yasri, Maria. “Capteur de corrosion passif et sans contact : Passive wireless sensor for corrosion monitoring.” 2016. Web. 25 Jun 2019.

Vancouver:

Yasri M. Capteur de corrosion passif et sans contact : Passive wireless sensor for corrosion monitoring. [Internet] [Doctoral dissertation]. Brest; 2016. [cited 2019 Jun 25]. Available from: http://www.theses.fr/2016BRES0006.

Council of Science Editors:

Yasri M. Capteur de corrosion passif et sans contact : Passive wireless sensor for corrosion monitoring. [Doctoral Dissertation]. Brest; 2016. Available from: http://www.theses.fr/2016BRES0006

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