Application of ICA and ANC Technique in Nondestructive Testing
WU Ying-zi · Noise and Vibration Control · 2007
As a non-destructive way,acoustic impulse test technique has been widely used to do product quality test.But in the industrial and agricultural application environment,the impulse signals are always disturbed by surrounding noises.In order to reduce these disturbances,the following two kinds of methods are proposed in this paper: one is the independent component analysis(ICA) technique;the other is active noise control(ANC) technique.In ICA,the acoustic impulse response and disturbance noises are thought as two ICs;the experiment system and results are introduced finally.On the other hand,as a special ANC system proposed in the paper,it is a selective attention noise control system and it has system SNR processing benefit because the useful acoustic impulse response signals are mixed in the useless noises, which are whished to be cancelled completely.This paper introduces the principles of ICA and ANC separately and the acoustic experiment,which shows that both methods have better perspective for this application,but have some disadvantages at the same time.