| 摘要 |
<p>A transducer for acoustic detection and localization of sound generating defects comprising two spatially separated sensors (1), each coupled to a multiplier (6) for multiplying the signals from the sensors (1), and an output port for transferring the multiplied signal to a suitable instrument (8) or a suitable indicator. In a method the said transducer is used for acoustic detection and localization of sound generating defects in machines, in particular electrical partial discharges in high voltage transformers comprising at least the placing of an acoustic transducer at several locations on the surface of an object to be examined. Detection of the acoustic signal which the transducer senses is performed for each position of the transducer and stored together with position data. The transducer is for each position rotated mechanically through a plurality of angles. At each position the value of the acoustic signal which the transducer senses is detected and stored. The detected and stored signal values are analyzed for at each position of the transducer to identify the angle corresponding to the largest signal value, in order to determine the localization of the acoustic source in a plane.</p> |
