Abstract
In this paper, a novel fiber turbine flow sensor was proposed and demonstrated for liquid measurement with optical fiber, using light intensity modulation to measure the turbine rotational speed for converting to flow rate. The double-circle-coaxial (DCC) fiber probe was introduced in frequency measurement for the first time. Through the divided ratio of two rings light intensity, the interference in light signals acquisition can be eliminated. To predict the characteristics between the output frequency and flow in the nonlinear range, the turbine flow sensor model was built. Via analyzing the characteristics of turbine flow sensor, piecewise linear equations were achieved in expanding the flow measurement range. Furthermore, the experimental verification was tested. The results showed that the flow range ratio of DN20 turbine flow sensor was improved 2.9 times after using piecewise linear in the nonlinear range. Therefore, combining the DCC fiber sensor and piecewise linear method, it can be developed into a strong anti-electromagnetic interference(anti-EMI) and wide range fiber turbine flowmeter.
Highlights
Flow rate measurement is of great importance to a wide range of industries including oil and gas, chemical and textiles, food production and the pharmaceutical industry [1]
Eachofgroup of processed data was by the least squares method (LSM), correspondingly, four piecewise linear flow functions were processed by the least squares method (LSM), correspondingly, four piecewise linear [28,29] flow given in Table in which, the fifth givenequation by original experimental calibration
The in the module of LabVIEW/Mathscript, the output frequency was converted into flow module of LabVIEW/Mathscript, the output frequency was converted into flow rate
Summary
Flow rate measurement is of great importance to a wide range of industries including oil and gas, chemical and textiles, food production and the pharmaceutical industry [1]. Hu [6] proposed a new type of optic flowmeter system based on the bending loss of an optic fiber. Vijayan [7] explored the effective use of optical fiber for air flow measurement He proved the feasibility of new concept of hinge sensor for flow. P. Lu [10] proposed a new fiber-optic sensorindicated system that this sensor can be used grating to measure the fluid with the flow-rate from 0 to 1000. Bragg grating cantilever as optic macro-bend based gas flowmeter for low flow rates. Proposed a novel fiber optic macro-bend based gas flowmeter for low flow rates. Intensity modulation fiber optic turbine flowmeter, which has more strong anti-EMI, large range ratio and remote transmission, etc.
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