METHOD OF DETERMINING LOCATION OF ACOUSTIC EMISSION SOURCES USING ONE RECEIVER

摘要

FIELD: physics. ^ SUBSTANCE: two sources which imitate acoustic emission signals (calibration signals) are placed at a known distance S from each other on the analysed technical device or sample of the analysed material. Said signals are received with receiving apparatus with parallel data digitisation. The calibrated signals undergo wavelet decomposition. Wavelet decomposition scaling coefficients which correspond to frequency components F1 and F2 are selected (F1 and F2 lie in the spectrum range of the recorded acoustic frequency conversions, F2ëÑ2êùF1). Maxima of the mutual correlation function R which will correspond to time delay between the analysed series of wavelet coefficients are determined. For each of the pairs of wavelet coefficients of frequency coefficients F1 and F2 the delay of propagation of the frequency component F1 relative component F2 is calculated using the formula: ötk=öt1-öt2, where öt1 and öt2 is delay between the analysed wavelet coefficients of the pair of calibration signals for frequency components F1 and F2, respectively. The analysed technical device or sample of analysed material is loaded. Acoustic emission signals are recorded. The recorded acoustic emission signals undergo wavelet decomposition, after which the location of acoustic emission sources is determined via defined mathematical processing of the data obtained from the wavelet decomposition. ^ EFFECT: possibility of determining distance to an acoustic emission signal source using one acoustic emission signal receiver. ^ 8 dwg