Optical Fiber Flow Speed sensor

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  • 光ファイバを用いた渦流速センサの感度向上
  • ヒカリ ファイバ オ モチイタ カリュウソク センサ ノ カンド コウジョウ

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Abstract

A simple structured flow speed sensor in which a polarization maintaining optical fiber is used as a Karman's vortex generator and also a vortex frequency sensor had been proposed. For measuring ocean current velocity, a double fine type sensor mount was designed and investigated in detail experimentally.Even if the experimental results showed its essential effectiveness, several problems were also found out. <br>A conduit type sensor mount has newly been proposed for solving these problems. A sensor for this mount has been constructed by using a 16φ circular pipe. Experimental results of the sensor shows a wide range agreement between detected frequencies vs, measured flow speeds and the expected frequencies with Roshko's equation. And the minimum detectable flow speed of 0.27m/s is obtained.

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