Design of Non-Contact Liquid Level Detection System Based on FDC2214
A non-contact liquid level measurement system based on FDC2214 capacitive sensor is proposed to solve the problems of corros-ivenes,being easily gasified,being easily solidified,and other special problems of liquid level measurements.The hardware system com-posed of an STM32F103 chip and an FDC2214 capacitance sensor is designed.Through data analysis of capacitance change and tempera-ture change curve,the corresponding temperature compensation system is built.In addition,the system uses a Kalman filtering algorithm to filter the measured data,which effectively improves the measurement accuracy and stability of the system.The test results show that the liquid level measuring system measures 10 groups of different liquid levels,and the sensitivity of the liquid level gauge is 190.5 pF/m.Besides,the liquid level measurement system can complete the liquid level measurement without changing the structure of the liquid con-tainer.Finally,the Kalman filtering algorithm can effectively improve the measurement accuracy and stability of the liquid level gauge.
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