LU Xin1, HE Ming-xuan3, LI Yuan1, et al. Design of capacitance detecting system based on capacitive sensing probe[J]. 2011, 30(12): 95-97+101. DOI: 10.13873/j.1000-97872011.12.016.
A capacitive tactile probing system and the corresponding capacitance detecting system are developed to meet different measuring requirements.The principle of the probe and the capacitance sensor are illustrated.According to the measuring principle
the capacitance detecting circuit is the crucial component of the capacitive detecting system.Capacitance/digital converter(CDC)AD7747 chip is used in this circuit.The I2C communication procedure between MCU and AD7747 and the serial communication between MCU and host computer are compiled to realize the detecting and handle the data.The performance of Z-axis is test simply.Through analysis of the experiment data
the resolution of the capacitive sensing probe system achieves 0.02 μm and has a good repeatability.The possibility of the system is proved.
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