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Optics Letters

Optics Letters


  • Vol. 14, Iss. 17 — Sep. 1, 1989
  • pp: 967–969

Fiber-optic sensor for humidity

Fedor Mitschke  »View Author Affiliations

Optics Letters, Vol. 14, Issue 17, pp. 967-969 (1989)

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A novel fiber-optic humidity sensor is described. It is based on reversible sorption of water from the ambient atmosphere in a porous thin-film interferometer that sits on the tip of a fiber. The sorbed water changes the refractive index of the thin films and thus the reflectivity of the interferometer; the resulting modulation of the reflected intensity is detected. The sensor is insensitive to electromagnetic interference and aggressive chemicals and is extremely small (micrometers).

© 1989 Optical Society of America

Original Manuscript: March 24, 1989
Manuscript Accepted: May 23, 1989
Published: September 1, 1989

Fedor Mitschke, "Fiber-optic sensor for humidity," Opt. Lett. 14, 967-969 (1989)

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  1. For recent studies of thin-film growth see, e.g., J. R. Banavar, M. Kohmoto, J. Roberts, Phys. Rev. A 33, 2065 (1986); A. Mazor, D. J. Srolowitz, P. S. Hagan, B. G. Bukiet, Phys. Rev. Lett. 60, 24 (1988); R. P. U. Karunasiri, R. Bruinsma, J. Rudnick, Phys. Rev. Lett. 62, 788 (1989). [CrossRef] [PubMed]
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  5. M. R. Shahriari, G. H. Sigel, Q. Zhou, in Digest of Conference on Optical Fiber Sensors (Optical Society of America, Washington, D.C., 1988), p. 373.
  6. F. Kohlrausch, Praktische Physik, 23rd ed. (Teubner, Stuttgart, 1985), Vol. 1, pp. 397–406.
  7. K. Tiefenthaler, W. Lukosz, Opt. Lett. 9, 137 (1984). [CrossRef] [PubMed]
  8. A. Enokihara, M. Izutsu, T. Sueta, Appl. Opt. 27, 109 (1988). [CrossRef] [PubMed]
  9. F. Mitschke, G. Ankerhold, W. Lange, Appl. Phys. B 48, 467 (1989). [CrossRef]
  10. Testotherm Model Hygrotest 6300, 7825 Lenzkirch, Federal Republic of Germany.

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