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Applied Optics

Applied Optics


  • Vol. 37, Iss. 13 — May. 1, 1998
  • pp: 2526–2533

Optical fiber water droplet sensor using absorption of fluorescence of Tm3+:YAG

Masayuki Yokata and Toshihiko Yoshino  »View Author Affiliations

Applied Optics, Vol. 37, Issue 13, pp. 2526-2533 (1998)

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A two-dimensional noncontact optical fiber water droplet sensor that uses the fluorescence from a laser-diode-pumped Tm3+:YAG and that uses a single fiber bundle for the probe fiber has been constructed. The sensor is based on absorption spectroscopy but has the significant advantage that the residual pump light works for the reference signal. The water depth can be evaluated from the minimum intensity ratio between the fluorescence signal and the reference signal when the probe is scanned in plane. The sensor can also estimate both the size and the position of a water droplet. A high degree of discrimination of a water droplet from other perturbations such as oil and surface irregularities has been demonstrated. An approximate calculation in a hemispherical model of a water droplet was carried out and is shown to be in good agreement with experimental results.

© 1998 Optical Society of America

OCIS Codes
(010.7340) Atmospheric and oceanic optics : Water
(040.3060) Detectors : Infrared
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(130.6010) Integrated optics : Sensors

Original Manuscript: July 11, 1997
Revised Manuscript: January 8, 1998
Published: May 1, 1998

Masayuki Yokata and Toshihiko Yoshino, "Optical fiber water droplet sensor using absorption of fluorescence of Tm3+:YAG," Appl. Opt. 37, 2526-2533 (1998)

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