3D numerical modeling and experimental validation of diamagnetic levitating suspension in the static field

This paper describes a radiation pressure meter based on a diamagnetic spring. We take advantage of the diamagnetic property of pyrolytic carbon to make an elementary levitated system. It is equivalent to a torsional spring-mass-damper system consisting of a small pyrolytic carbon disc levitated above a permanent magnet array. There are several possible measurement modes. In this paper, only the angular response to an optical power single-step is described. An optical detection composed of a laser diode, a mirror and a position sensitive detector (PSD) allow measurement of the angular deflection proportional to the voltage delivered by the PSD. Once the parameters of the levitated system depending on its geometrical and physical characteristics have been determined regardless of any optical power, by applying a simple physical law, one can deduce the value of the optical power to be measured from the measurement of the first maximum of the output voltage amplitude.

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“…Gabrielson [16] gives the following equation for the Brownian force equation in newtons per root hertz:…”

Section: Mechanical Resistance Zmentioning

confidence: 99%

Optical power meter using radiation pressure measurement

Pinot

Silvestri

2019

Measurement

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“…The stabilization of the levitation of a piece of PyC depends on the 3D magnetic field. Several authors [8][9][10] have studied the magnetic field distribution created by different arrangements of permanent magnets.…”

Section: Pyrolytic Carbon Diamagnetismmentioning

confidence: 99%

Pyrolytic carbon: applications of its diamagnetism in metrology

Pinot¹,

Silvestri²

2019

Int. J. Metrol. Qual. Eng.

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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.

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“…[32][33][34][35][36] On the other hand, the levitation using diamagnetic materials has also been theoretically studied. [37][38][39][40] Previous theoretical studies on graphene or graphite focus on the case with diamagnetic force in one direction or the case with diamagnetic force in a uniform magnetic field. 28,39 The detailed theoretical study on the orientation control of graphene flakes has not been fully reported or used to understand physical devices.…”

Section: Introductionmentioning

confidence: 99%

“…[37][38][39][40] Previous theoretical studies on graphene or graphite focus on the case with diamagnetic force in one direction or the case with diamagnetic force in a uniform magnetic field. 28,39 The detailed theoretical study on the orientation control of graphene flakes has not been fully reported or used to understand physical devices. The understanding of the graphene levitation and orientation control requires studies on torques in all three spatial directions in a non-uniform magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Graphene levitation and orientation control using a magnetic field

Niu

Lin

Wang

et al. 2018

Journal of Applied Physics

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This paper studies graphene levitation and orientation control using a magnetic field. The torques in all three spatial directions induced by diamagnetic forces are used to predict stable conditions for different shapes of millimeter-sized graphite plates. We find that graphite plates, in regular polygon shapes with an even number of sides, will be levitated in a stable manner above four interleaved permanent magnets. In addition, the orientation of micrometer-sized graphene flakes near a permanent magnet is studied in both air and liquid environments. Using these analyses, we are able to simulate optical transmission and reflection on a writing board and thereby reveal potential applications using this technology for display screens. Understanding the control of graphene flake orientation will lead to the discovery of future applications using graphene flakes.

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3D numerical modeling and experimental validation of diamagnetic levitating suspension in the static field

Cited by 15 publications

References 22 publications

Optical power meter using radiation pressure measurement

Optical power meter using radiation pressure measurement

Pyrolytic carbon: applications of its diamagnetism in metrology

Graphene levitation and orientation control using a magnetic field

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