论文信息 - Direct interface for capacitive sensors based on the charge transfer method

Direct interface for capacitive sensors based on the charge transfer method

We present the theoretical analysis and experimental performance results of a direct interface for capacitive sensors based on the charge transfer method when parasitic capacitances are included. The interface circuit implements a two-point calibration technique that makes measurement results independent from voltage-and temperature-dependent parameters. The measurement deviation is below 1 % FSR (Full Scale Range) for capacitances from 10 pF to 1 nF.

R. Pallas-Areny | M. Gasulla | J.E. Gaitan-Pitre

[1] Gerard C. M. Meijer,et al. Measurement of dielectric absorption of capacitors and analysis of its effects on VCOs , 1996 .

[2] Paul H Dietz,et al. Wireless liquid level sensing for restaurant applications , 2002, Proceedings of IEEE Sensors.

[3] Edgar Sanchez-Sinencio,et al. Applications of Switched Capacitor Circuits , 1984 .

[4] F. Reverter,et al. A low-cost microcontroller interface for low-value capacitive sensors , 2004, Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.04CH37510).

[5] John G. Webster,et al. Sensors and Signal Conditioning , 1993 .

[6] Manel Gasulla,et al. Accuracy and resolution of direct resistive sensor-to-microcontroller interfaces , 2005 .