Measurement of contact stresses using real-time shearing interferometry
نویسندگان
چکیده
Liming Xu Hareesh V. Tippur Carl-Ernst Rousseau Auburn University Department of Mechanical Engineering Auburn, Alabama 36849 Abstract. The optical method coherent gradient sensing, a real-time lateral shearing interferometry, is proposed for measuring contact stress fields under static and dynamic loading conditions. Feasibility of the method is first established under quasi-static conditions. Under dynamic conditions, the method has been used in conjunction with high-speed photography. The interference patterns representing stress gradients are used for extracting impact load history. Loading rates of approximately 14 MN/sec have been observed. The optical measurements are compared with the computed values obtained using finite element simulations. © 1999 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(99)01811-5]
منابع مشابه
Simultaneous Phase Shifting Shearing Interferometry for Measurement of Static and Dynamic Phase Objects
Through the use of non-destructive optical techniques to measure the surface with high accuracy, two shearing interferometers were implemented to analyze the slope of phase objects using simultaneous phase-shifting shearing interferometry [Toto et al., 2010]. These optical configurations allow obtaining n-shearograms simultaneously to retrieve the optical phase data map with higher accuracy [Ro...
متن کاملApplication of lateral shearing interferometry to 'stochastic inputs*
Lateral shearing interferometry is a simple and accurate method of measuring the shape of an optical wave front. However, the complex mathematics required in reduction of the interferograms has limited the adoption of this interferometric technique. A data reduction technique using Fourier analysis methods has been developed which makes lateral shearing interferogram reduction more flexible. Th...
متن کاملExtending Murty interferometry to the Terahertz part of the spectrum
We discuss some novel technologies that enable the implementation of shearing interferometry at the terahertz part of the spectrum. Possible applications include the direct measurement of lens parameters, the measurement of refractive index of materials that are transparent to terahertz frequencies, determination of homogeneity of samples, measurement of optical distortions and the non-contact ...
متن کاملContinuous monitoring of a surface slope by real-time shearing interferometry with a photorefractive crystal.
We propose and demonstrate a new technique for measuring the temporal variations of the surface slope of an object. This real-time shearometric arrangement takes advantage of the dynamic properties of holograms in photorefractive crystals. The accuracy of the measurements should make this technique suitable for real-time structural intensity determinations.
متن کاملObservable coherence theory for statistically periodic fields
The framework of cyclostationary random processes is used to develop classical coherence theory for the measurement of statistically periodic stochastic optical fields, such as those produced by pulsed lasers. Cycloergodicity is invoked to show that precise and accurate inferences of the nonstationary process statistics can be made from a single field realization. In particular, many-pulse obse...
متن کامل