COMPARISON OF PUNCTURE TEST, ACOUSTIC EMISSION AND SPATIAL-TEMPORAL SPECKLE CORRELATION TECHNIQUE AS METHODS FOR APPLE QUALITY EVALUATION *

A b s t r a c t . A major quality problem for producers and consumers of apples is their softening during storage. This paper presents comparison of thre e methods for monitoring quality changes of apples during shelf-life storage: puncture test with acous tic emission and spatial-temporal speckle correlati on technique. Firmness, acoustic emission counts and cross-correlation coefficient difference obtained by these methods, respectively, were analysed. The par ameters show different correlation coefficients wit h time of storage. The highest correlation coefficien t was obtained by the non-destructive spatial-tempo ral correlation technique. Puncture test with acoustic emission shows also significant changes with time and these methods provide information about mechanical properties and especially about the fracture proper ties of the material. Higher correlation coefficien t between firmness and acoustic emission counts was obtained than between firmness and cross-correlatio n coefficient difference. The experiment has shown that for testing the quality of apples there is no difference related to the side of apples. K e y w o r d s : nondestructive method, biospeckle, acoustic emission, puncture

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