Int. J. Metrol. Qual. Eng.
Volume 10, 2019
|Number of page(s)||8|
|Published online||30 July 2019|
Pyrolytic carbon: applications of its diamagnetism in metrology
Laboratoire Commun de Métrologie LNE/CNAM, 1 rue Gaston Boissier, Paris 75724 Cedex 15, France
* Corresponding author: firstname.lastname@example.org
Accepted: 10 July 2019
This paper presents some current or potential applications in metrology based on the diamagnetism of pyrolytic carbon (PyC). The magnetic repulsion force acting between a piece of PyC subjected to a magnetic flux can be used as magnetic spring either to control the position of the sensitive sensor element or to detect changes of a physical quantity to be measured. The first part of this paper provides examples briefly described of devices based on the diamagnetism of PyC for measuring mechanical quantities. There are two main configurations for magnetic levitation: one, used for measuring acceleration or inclination for instance, is based on the levitation of a PyC tile above a magnet or set of magnets; In the other, used to measure forces caused for example by contact or buoyancy, it is the permanent magnet that is levitated at a stable height above a fixed PyC tile. The second part describes current work at the Laboratoire Commun de Métrologie (LCM-LNE/CNAM) on the development of new laser power sensors using either diamagnetic force changes by photothermal excitation of electrons or diamagnetic torsion spring.
Key words: Accelerometer / force meter / laser power / magnetic levitation / pyrolytic carbon / tiltmeter
© P. Pinot and Z. Silvestri, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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