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Proceedings Paper

Average atmosphere temperature measurement by a frequency-shifted feedback laser
Author(s): Noriko Kibayashi; Takefumi Hara; Masato Yoshida; Koichiro Nakamura; Hiromasa Ito
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Paper Abstract

A Frequency-Shifted Feedback (FSF) laser has an intracavity acousto-optic modulator (AOM) and the spectral output consists of a chirped frequency comb evenly spaced at the cavity free spectral range (FSR). An FSF laser is a useful source for optical frequency domain reflectometry (OFDR). We present a new average atmospheric temperature sensor by OFDR using an FSF laser for the first time. The beat signal, which is detected through the self-delayed heterodyne detection of an FSF laser, is proportional to the path difference, and measurements can be done within the frequency bandwidth of a cavity FSR. Furthermore, the beat frequency characteristics are unrelated to the beat order. Therefore, the path measurement resolution is consist and unrelated to the path difference. Changes in atmospheric refractive index primarily depend on variation of temperature and pressure. Observing variation in path difference with an FSF laser should allow calculation of the average atmospheric temperature along the path if the change in pressure is known. As the path difference increases, the temperature resolution improves. This paper outlines the principle of the average atmospheric temperature measurement using an FSF laser and presents preliminary experimental result.

Paper Details

Date Published: 21 February 2001
PDF: 8 pages
Proc. SPIE 4150, Optical Remote Sensing of the Atmosphere and Clouds II, (21 February 2001); doi: 10.1117/12.416973
Show Author Affiliations
Noriko Kibayashi, Tohoku Univ. (Japan)
Takefumi Hara, Tohoku Univ. (Japan)
Masato Yoshida, Tohoku Univ. (Japan)
Koichiro Nakamura, Tohoku Univ. (Japan)
Hiromasa Ito, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 4150:
Optical Remote Sensing of the Atmosphere and Clouds II
Yasuhiro Sasano; Jinxue Wang; Tadahiro Hayasaka, Editor(s)

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