Title :
Electric eddy current pick-up of turbine flow sensor and CPLD nonlinearity correction
Author :
Zhai, Wei-qiang ; Sun, Li-jun ; Liu, Xi-bao ; Zhang, Tao
Author_Institution :
Sch. of Electr. Eng. & Autom., Tianjin Univ., Tianjin, China
Abstract :
The force due to electromagnetic pick-up can affect the performance of small pipeline turbine flow sensor. Based on electric eddy current, a new pick-up was designed for eliminating the effect of reluctance torque in traditional pick-up. The range ability of DN4mm, DN6mm and DN10mm turbine flow sensor were expanded to 10:1. The reliability of nonlinearity correction by software is not fully guaranteed as it was applied in bad work condition. In order to solve the problem, a method of non linearity correction by hardware, is that Complex Programmable Logic Device (CPLD), was put forward. It was shown by turbine flow sensor prototype experiment with electric eddy current pick up combining CPLD hardware nonlinearity correction. DN4mm, DN6mm and DN10mm turbine flow sensor obtain the linearity 0.32%, 0.26%and 0.32% respectively in the range ability of 10:1.
Keywords :
eddy currents; electromagnetic forces; flow sensors; pipe flow; pipelines; programmable logic devices; turbines; CPLD hardware nonlinearity correction; complex programmable logic device hardware nonlinearity correction; electric eddy current pick-up; electromagnetic pick-up force; nonlinearity correction reliability; pipeline turbine flow sensor; reluctance torque elimination; size 10 mm; size 4 mm; size 6 mm; Eddy currents; Frequency modulation; Hardware; Pipelines; Rotors; Table lookup; Turbines; CPLD nonlinearity correction; Turbine flow sensor; electric eddy current; signal pick-up;
Conference_Titel :
Electric Information and Control Engineering (ICEICE), 2011 International Conference on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-8036-4
DOI :
10.1109/ICEICE.2011.5778271
