Abstract
We propose a new non-intrusive flowmeter using the distributed feedback (DFB) fiber laser as a flowmeter to monitor the flow rate in the pipe. The DFB flowmeter is set on the outer wall of the pipe. And the relationship between the wavelength and the phase changes of the DFB flowmeter and the liquid flow rate in the pipeline is derived via turbulent vibration. Under the guidance of this theory, the design and test of the DFB flowmeter is completed. The result shows that this DFB flowmeter can measure the pipe flow from 0.71 m<sup>3</sup>/h to 2.35 m<sup>3</sup>/h accurately via frequency analysis in different frequency regions, which demonstrates the feasibility of the new non-intrusive flow measurement method based on DFB-FL and has achieved accurate measurement of small flow rates.
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