Noise vibration analysis detection

Hongler, M., Meneses, Y., Beyeler, A. Jacot, J. (2003). The resonant retina exploiting vibration noise to optimally detect edges in an image, IEEE Trans. Pattern Analysis and Machine Intelligence, vol. 25, no. 9, pp. 1051-1062. 

Terahertz, or far infrared spectroscopy, covers the frequency range from 0.1 to lOTHz (300 to 3cm ) where torsional modes and lattice vibrations of molecules are detected. It is increasing in use in many application areas, including analysis of crystalline materials. Several dedicated conunercial instruments are available which use pulsed terahertz radiation which results in better signal to noise than those using blackbody sources for radiation (and associated with the terminology far infrared spectroscopy). Work using extended optics of FTIR instrumentation as weU as continuous-wave source THz has also been recently reported. ... 

The objective of preventive maintenance is to extend the life of an item and prevent all failures before they occur by detecting critical wear that leads to failure or breakdown. This can be accomplished by estimating a lifetime schedule for each item. The way this estimation takes place determines the type of preventive maintenance. In predetermined maintenance the estimation is static and results in static maintenance intervals. In condition-based maintenance, maintenance intervals are determined according to either the detection of a degradation mechanism by monitoring or a forecast derived from the analysis and evaluation of a number of parameters (i.e., vibration, imbalance, machine noises, power demand) of the degradation mechanism (thus, condition-based maintenance is often referred as predictive maintenance). 

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