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The leakage-induced acoustic vibrations are guided by the pipelines and discretized into several modes. Different modes exhibit different dispersive behaviors and generate vibrations of different directions. In this study, the modal characteristics of acoustic vibrations in different directions are investigated theoretically and experimentally. The dispersive natures and the displacement distributions...
This paper presents an adaptive leak detection and location scheme for gas pipelines by using acoustic emission (AE) sensors. When gas being ejected from pipelines, an acoustic emission is produced at the leak hole and the acoustic vibration is transmitted along the pipeline. The acoustic movement can be picked up by AE sensors placed at either sides of a suspected leak on the outer surface of pipelines...
The megnetoelectric (ME) effect of magnetostrictive Terfenol-D (Tb1-xDyxFe2-y) and piezoelectric Pb(Zr,Ti)O3 plates bonded on a beryllium bronze substrate is reported. The substrate severs as a frequency determining element and dominates the quality factor (Qm) of the oscillator. The device can be regarded as a driven damped system. Its resonance occurs at multimodes where the Terfenol-D plate...
An online non-contact fault detection Method of LED chips is presented based on the photovoltaic effect in diodes. By observing the photo-generated current in the bonding lead frame of a LED chip, the LED chip and its electric connection with the lead frame during packaging are checked. The fault detection principle is described in detail in this paper. By using the method based on the law of electromagnetic...
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