Abstract
signal frequencies and rms voltage value supplied to round piezoelectric transducers. Used transducers have created a high energy acoustic field in prepared insulating oil samples. The acoustic emission signal contains a broad-band noise and a fundamental frequency component and its harmonics, produced by the direct driving acoustic field. The paper presents the spectral analysis of acoustic emission signal observed during acoustic cavitation in insulating oils. To emphasize the changes in acoustic cavitation intensity also time‐frequency analysis was used and some spectrograms were evaluated. The measurement uncertainty of some frequency‐rms voltage pairs was very unfavorable. The main application expected with created cavitation measurement system is to develop a diagnostic tool for the aging of oil, based on the hypothesis that the measured cavitation intensity and spectrum could be aected by aging. Previous published measurements showed some relationship between insulating oil aging process and changes of acoustic emission of cavitations. PACS: 02.60.Lj, 43.40.Le
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