Stochastic Resonance in Acoustic Emission

摘要

Stochastic resonace allows below-threshold signals to be detected because of the presence of favorable background noise. In this paper the author describes stochastic resonance and anti-resonace and presents some examples to illustrate how these awffect the detection rates of acoustic emission signals or ultrasonic pulses in lwo signal-to-noise environemnts. The author introduces the signal fraction, a measure for quantifying the fraction of detected events that cotnain a signal that appears to have advantages over thes signal-to-noise ratio for certawin kinds of data, and a formalism for calculating the probability of signal detection when the noise is a time-dependent sinusoid.