Fiber-Optic Low Coherence Velocimetry by Detecting Interference Fluctuations (Special Issue on Optical Fiber Sensors)

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概要

• 論文の詳細を見る

• A new sensing method for measuring directly flow velocity by using low coherence interference techniques is proposed and demonstrated. In this method, a temporally fluctuating signal, not the Doppler frequency shift, is detected. Theoretical analysis shows that a spectrum of light backscattered from a particle takes a Gaussian form whose width is simply proportional to the flow velocity. The measured velocity is in good agreement with the actual flow velocity derived from the flow rate. The dynamic range of this sensing method is governed by the frequency range of the FFT processor used and is estimated to be 1.4×10^<-4>…14m / s. The depth position can be adjusted with an accuracy of approximately 30 μm which is determined by the coherence length of the light source. The velocity distribution along the depth is easily measured by changing mechanically the length of the reference arm in the low coherence interferometer.

• 社団法人電子情報通信学会の論文
• 2000-03-25

著者

• Imai Yoh

  The Deaprtment Of Computer Science And Electronics Kyushu Institute Of Technology

• TANAKA Kazuhiro

  the Department of Mechanical System Engineering, Kyushu Institute of Technology

• Tanaka Kazuhiro

  The Department Of Mechanical System Engineering Kyushu Institute Of Technology

関連論文

• Fiber-Optic Low Coherence Velocimetry by Detecting Interference Fluctuations (Special Issue on Optical Fiber Sensors)

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