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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 27 — Sep. 20, 2012
  • pp: 6528–6538

Magnetic field sensing based on capillary filled with magnetic fluids

Hongzhu Ji, Shengli Pu, Xiang Wang, Guojun Yu, Ning Wang, and Haotian Wang  »View Author Affiliations


Applied Optics, Vol. 51, Issue 27, pp. 6528-6538 (2012)
http://dx.doi.org/10.1364/AO.51.006528


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Abstract

A kind of magnetic field sensing system based on capillary tube filled with magnetic fluids is developed in this work. The analytical expressions for the sensing system are derived in detail. The sensitivity and other sensing properties of the system are investigated numerically and experimentally. The focal line position of the emergent light after the capillary is related with the strength of the externally applied magnetic fields and recorded and judged by the CCD to sense the magnetic field indirectly. The sensing mechanism is analyzed and ascribed to the magnetically tunable refractive index of magnetic fluids. This kind of sensing unit has the advantages of miniaturization of device, easy operation, and lower dosage of sensing media.

© 2012 Optical Society of America

OCIS Codes
(160.3820) Materials : Magneto-optical materials
(230.3810) Optical devices : Magneto-optic systems
(160.4236) Materials : Nanomaterials
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:
Optical Devices

History
Original Manuscript: July 23, 2012
Manuscript Accepted: August 14, 2012
Published: September 14, 2012

Citation
Hongzhu Ji, Shengli Pu, Xiang Wang, Guojun Yu, Ning Wang, and Haotian Wang, "Magnetic field sensing based on capillary filled with magnetic fluids," Appl. Opt. 51, 6528-6538 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-27-6528


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