Authors: Alec Feinberg
Noise measurements analysis has been associated with degradation. In particular one such type is called 1/f noise and is the most likely measure of subtle degradation occurring in materials. This measurement is done using random vibration methods. It is important to determine if this is the likely region of the spectrum related to degradation occurring in materials to aid in noise type of reliability tests. The literature on 1/f noise appears to have a broad commonality in explanations that can be associated with entropy in materials. It is reasonable in this regard to look at 1/f noise aspects in terms of disorder and the associated spectral content. This lends itself to a thermodynamic entropy frame work for analysis. We review some of the key aspects of 1/f noise in the literature and discuss how observations relate to entropy. Once describe, we suggest two thermodynamics models that might be used to model 1/f noise. Results help to provide a broader understanding of 1/f noise, help to identify the region of the spectrum related to degradation, and use it to do prognostics. Such interpretation suggests that 1/f noise is a good tool for measuring certain aspects of disorder in materials. Experiments are suggested to demonstrate the importance of 1/f noise as a prognostic tool for reliability testing to identify and predict degradation in materials over time.
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