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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 25 — Sep. 1, 1999
  • pp: 5298–5305

Micromachined optical fiber current sensor

R. L. Heredero, Ramón Fernández de Caleya, Héctor Guerrero, Pere Los Santos, Mari Cruz Acero, and Jaume Esteve  »View Author Affiliations


Applied Optics, Vol. 38, Issue 25, pp. 5298-5305 (1999)
http://dx.doi.org/10.1364/AO.38.005298


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Abstract

We describe a micromachined optical fiber current sensor. The sensing element consists of a squared silicon membrane (8 mm long and 20 µm thick) that has a cylindrical permanent magnet (NdFeB alloy, 3-mm diameter, 1.5 mm high) fixed on its central region. This structure allows the permanent magnet to vibrate in the presence of the magnetic field gradient generated by an ac. A linear relation between the electrical current and the magnet displacement was measured with white-light interferometry with an optical fiber low-finesse Fabry–Perot microcavity. A measurement range of 0–70 A and a minimum detectable intensity of 20 mA were obtained when distance D between the membrane and the electrical power line was 5 mm. The output signal directly shows a linear response with distance D.

© 1999 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry

History
Original Manuscript: March 11, 1999
Revised Manuscript: June 1, 1999
Published: September 1, 1999

Citation
R. L. Heredero, Ramón Fernández de Caleya, Héctor Guerrero, Pere Los Santos, Mari Cruz Acero, and Jaume Esteve, "Micromachined optical fiber current sensor," Appl. Opt. 38, 5298-5305 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-25-5298


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