All the techniques that measure displacements, whether in the range of visible optics or any other form of field methods require the presence of a carrier signal. The carrier signal is a wave form that is modulated (modified) by an input, deformation of the medium. The carrier is tagged to the medium under analysis and deforms with the medium. The wave form must be known both in the unmodulated and the modulated conditions. There are two basic mathematical models that can be utilized to decode the information contained in the carrier, phase modulation or frequency modulation, both are closely connected. Basic problems that are connected to the detection and recovery of displacement information that are common to all optical techniques will be analyzed. This paper is concentrated in the general theory common to all the methods independently of the type of signal utilized. The aspects discussed are those that have practical impact in the process of data gathering and data processing
Basic foundations of signal analysis models applied to retrieval of displacements and their derivatives encoded in fringe patterns / Sciammarella, Ca; Lamberti, Luciano. - 4:(2016), pp. 19-33. (Intervento presentato al convegno SEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2015).
Basic foundations of signal analysis models applied to retrieval of displacements and their derivatives encoded in fringe patterns
LAMBERTI, Luciano
2016-01-01
Abstract
All the techniques that measure displacements, whether in the range of visible optics or any other form of field methods require the presence of a carrier signal. The carrier signal is a wave form that is modulated (modified) by an input, deformation of the medium. The carrier is tagged to the medium under analysis and deforms with the medium. The wave form must be known both in the unmodulated and the modulated conditions. There are two basic mathematical models that can be utilized to decode the information contained in the carrier, phase modulation or frequency modulation, both are closely connected. Basic problems that are connected to the detection and recovery of displacement information that are common to all optical techniques will be analyzed. This paper is concentrated in the general theory common to all the methods independently of the type of signal utilized. The aspects discussed are those that have practical impact in the process of data gathering and data processingI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
