Average atmosphere temperature measurement by a frequency-shifted feedback laser

Noriko Kibayashi; Takefumi Hara; Masato Yoshida; Koichiro Nakamura; Hiromasa Ito

doi:10.1117/12.416973

21 February 2001 Average atmosphere temperature measurement by a frequency-shifted feedback laser

Noriko Kibayashi, Takefumi Hara, Masato Yoshida, Koichiro Nakamura, Hiromasa Ito

Proceedings Volume 4150, Optical Remote Sensing of the Atmosphere and Clouds II; (2001) https://doi.org/10.1117/12.416973
Event: Second International Asia-Pacific Symposium on Remote Sensing of the Atmosphere, Environment, and Space, 2000, Sendai, Japan

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.

Citation Download Citation

Noriko Kibayashi, Takefumi Hara, Masato Yoshida, Koichiro Nakamura, and Hiromasa Ito "Average atmosphere temperature measurement by a frequency-shifted feedback laser", Proc. SPIE 4150, Optical Remote Sensing of the Atmosphere and Clouds II, (21 February 2001); https://doi.org/10.1117/12.416973

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