Physics – Instrumentation and Detectors
Scientific paper
2009-01-22
Fluctuation and Noise Letters 8 (2008) L125-L140
Physics
Instrumentation and Detectors
Scientific paper
10.1142/S021947750800443X
First we present and theoretically analyze the phenomenological physical picture behind Vibration-Induced Conductivity Fluctuations. We identify the relevant tensors characterizing the electromechanical response against the vibrations for both longitudinal and transversal responses. We analyze the conductivity response with acceleration type vibrations and a new scheme, measurements with more advantageous compression type vibrations that are first introduced here. Compression vibrations provide sideband spectral lines shifted by the frequency of the vibration instead of its second harmonics; moreover the application of this method is less problematic with loose electrodes. Concerning geometry and electrodes, the large measurement errors in earlier experiment indicated electrode effects which justify using four-electrode type measurements. We propose and analyze new arrangements for the longitudinal and transversal measurements with both compression vibration and acceleration vibration for laboratory and field conditions.
Chang Hung-Chih
Kish Laszlo B.
Kishne Andrea
Kwan Chiman
Morgan Cristine
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