An electrical tunable liquid crystal Fabry-Perot cell for a miniaturized 3D surface scanning profilometer
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Abstract:
We demonstrated a miniaturized optical profilometer of surface scanning manner by using an electrically tunable liquid crystal Fabry-Perot cell. The surface profile of the fringe patterns is explained by the resonance mode analysis of the interference patterns.The process of measuring the 3D relief of a cylindrical surface using an optical interference profilometer is described. The influence of the shape and orientation of the controlled surface on the error in measuring the depth of defects is considered. An algorithm is presented that makes it possible to automate the process of determining the depth of a defect from a measured 3D surface relief, using a basic cylindrical or flat surface.
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An optical method is described for determining the instrumental function associated with a Fabry-Perot etalon which forms part of a conventional pressure-scanned high resolution system. An ordinary discharge lamp (giving broad spectral lines) is used to illuminate the etalon, but the light is first passed through a second etalon at normal incidence. The characteristics of the second etalon are chosen so that the transmission maxima are narrow compared with the instrumental function of the etalon under test; if the latter is scanned, the resulting interferogram gives the required information. The application of the method to a particular case is described.
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Introduce Fabry - Perot Etalon and its results for standard situation. A discussion of the effect in unparallel situation is given, Adjusted the F - P Etalons practically and got satisfactory results.
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Monochromatic color
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This report describes a correlation study between an analog GM profilometer (the old profilometer) and a digital GM profilometer model 690D (the new profilometer). This correlation is very important because it provides the information necessary to make a smooth transition between the use of these two instruments. Multiple regression analysis is used to obtain Serviceability Index using root-mean-square vertical acceleration (RMSVA). RMSVA indexes are well defined and precisely measurable with the profilometer. A series of regression equations are presented in order to predict RMSVA from the old profilometer using the new profilometer. This report also presents an evaluation of non-contact transducers in the profilometer, which makes possible an increase of the profilometer speed during the profiling process and decreases damage to the profilometer.
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Monitoring surface conditions and prediction of the damage of road surface have been carried out periodically from point of view of the traffic safety and the pavement management system (PMS). Nowadays, the true profile for a specified spatial frequency range can be easily obtained by a profiler although it has inherent detective properties. In this paper, we studied an estimation of the true profile using the measurement data of the PIARC EVEN experiment acquired by a conventional 3m profilometer. The results show that the profilometer enables to estimate the true profile accurately for practical use on general highways.
Road surface
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Passband
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Interferometric visibility
Intensity interferometer
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Repeatability
Flatness (cosmology)
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