Boxed milk metamorphism detecting method based on wavelet and hilbert transform

According to wavelet de-noising and the Hilbert transform theory, a boxed-milk metamorphism rapid detection device and identification method are proposed. Wavelet de-noising method is used to eliminate signal noise, then the use of Hilbert transform for envelope Ways to achieve signal envelope curve, and then for the system damping ratio. Under the case that the package of liquid boxed milk is not destroyed, the change in the quality of the liquid milk can be estimated indirectly with the help of the damping ratio of the system. The experimental results with the use of conventional damping identification methods the results were compared, because of an increase of wavelet de-noising process, greatly improving the detection system damping ratio of detection accuracy.