Optics and Precision Engineering, Volume. 22, Issue 10, 2611(2014)
FBG turbine flow rate sensor for acquiring flow rate and temperature simultaneously
To measure multi-parameters at the same time by a flow sensor with only one Fiber Bragg Grating(FBG) as the sensitive element, a novel FBG turbine flow rate sensor was proposed. This sensor uses a power element turbine to achieve a fluid impact force to modulate the frequency of FBG center wavelength and to overcome the cross-talking of temperature and strain effectively. The theoretical calculation of flow rate detection sensitivity is 2.91·10-2 m/(s·Hz-1). To measure the properties of this sensor, a sensor measurement system was established, meanwhile the FBG center wavelength dynamic signal demodulated by a fiber dynamic demodulator was chosen to be the experiment origin data. A Fast Fourier Transform(FFT) was used to analyze the experiment data of the sensor. The result shows that the flower limit of flow rate is 0.541 7 m/s and the flow rate detection sensitivity is 2.57·10-2 m/(s·Hz-1) with the detection accuracy of 25 mm/s, which are lower than the calculated values. It suggests that the main reason of these phenomena is that the flow rate of fluid in the transmission pipeline is not an even distributed uniform motion and the pipeline inner wall has some viscous forces on the fluid. Empirical mode decomposition was used to analyze the original signal. The experiment data indicate that the temperature detection sensitivity of this sensor is 10.6 pm/℃ and detection accuracy is 0.5 ℃.
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JIANG Shan-chao, SUI Qing-mei, WANG Jing, WANG Zheng-fang, YE Qing-lin. FBG turbine flow rate sensor for acquiring flow rate and temperature simultaneously[J]. Optics and Precision Engineering, 2014, 22(10): 2611
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Received: Dec. 11, 2013
Accepted: --
Published Online: Nov. 6, 2014
The Author Email: Shan-chao JIANG (jiangshanchao88624@126.com)