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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 44, Iss. 14 — May. 10, 2005
  • pp: 2736–2744

Miniature fiber-optic pressure sensor with a polymer diaphragm

Edvard Cibula and Denis Ðonlagic  »View Author Affiliations


Applied Optics, Vol. 44, Issue 14, pp. 2736-2744 (2005)
http://dx.doi.org/10.1364/AO.44.002736


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Abstract

The fabrication and experimental investigation of a miniature optical fiber pressure sensor for biomedical and industrial applications are described. The sensor measures only 125 µm in diameter. The essential element is a thin polymer diaphragm that is positioned inside the hollow end of an optical fiber. The cavity at the fiber end is made by a simple and effective micromachining process based on wet etching in diluted HF acid. Thus a Fabry-Perot interferometer is formed between the inner fiber-cavity interface and the diaphragm. The fabrication technique is described in detail. Different sensor prototypes were fabricated upon 125 µm-diameter optical fiber that demonstrated pressure ranges from 0 to 40 and from 0 to 1200 kPa. A resolution of less than 10 Pa was demonstrated in practice. The fabrication technique presented facilitates production of simple and low-cost disposable pressure sensors by use of materials with that ensure the required biocompatibility.

© 2005 Optical Society of America

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation

Citation
Edvard Cibula and Denis Ðonlagic, "Miniature fiber-optic pressure sensor with a polymer diaphragm," Appl. Opt. 44, 2736-2744 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-14-2736


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