Ultrasound characterization of foam stability by discrete wavelet transformation

The study is focused on a non-contact and non-destructive ultrasound method for characterisation of surfactant foams. The results were analyzed by Discrete Wavelet Transformation (DWT) of Haar implemented with fast conversion. The results by the ultrasound method were compared and validated with image analysis of the resulting foam microstructure. Identical results were obtained after comparison of the two methods.