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With the increase of service time of aircraft, the damage in aircraft composite material components may be caused. A uniplanar multi-electrode capacitive sensor is used for detecting the damage in aircraft composite material. In order to improve the sensitivity of the sensor, the optimization for the structure parameters of the sensor with 8 electrodes is carried out. The optimization indexes of the...
Aiming at the detection of damages in composite components on aircraft, a uniplanar multi-electrode system is introduced. Electric potential distribution in the detection area is solved by finite element analysis, and the sensitivity matrix is calculated. To reconstruct the images with damage information, which is known as an ill-posed inverse problem, the application of optimal vector method is studied...
The inductance sensor is often used for the measurement of displacement, pressure because of its simple structure, reliability and high precision. Usually the inductance sensor adopts AC electric bridge as its converting circuit to turn the sensor's inductance into an AC voltage signal. So it is difficult to make digital processing directly for the user. This paper introduces a converting circuit...
A pulsed method for impedance spectroscopy measurement, different from the traditional swept frequency methods, is presented. A string of square-wave pulses is digitally generated as the excitation signal to the sensing electrodes. A pulsed measurement system is described. A sample-collecting method for sampling the instantaneous response signals is implemented based on a field programmable gate arrays...
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