The use of mechanical sensitivity model to enhance capacitive sensor characteristics (original) (raw)
2019, Analog Integrated Circuits and Signal Processing
Vibration analysis is a conditional preventive maintenance technique that measures the level of vibratory motion by a measuring chain containing a vibration sensor, an amplifier and an FFT analyzer. In the present work, the vibratory analysis technique is improved on the basis of vibration sensor (capacitive sensor) developments. A suitable capacitive sensor mathematical model is developed thus; a formula of its mechanical sensitivity according to the capacitance is extracted. Experimental and simulation tests are conducted to validate the developed model. A damping rate equal to 0.68 is chosen to reduce the measurement error to a value not exceeding 0.5% in order to increase the accuracy to a value greater than or equal to 99.5%, consequently the sensor mechanical sensitivity is optimized. Finally, the simulation of the developed model is carried out for two capacitive sensors. The first sensor is used in the experimental tests and has a damping rate equal to 0.64 and the second is the sensor proposed in this work, having a damping rate equal to 0.68. The comparison of the obtained results has showed that the damping rate of 0.68 has greatly improved the capacitive sensor performances.
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.