Results 151 to 160 of about 10,806,149 (217)
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Specialized Interferometric Testing Techniques
Workshop on Optical Fabrication and Testing, 1981With higher and higher demands put on the performance of optical systems today, there has been a trend toward using nonspherical surfaces in these systems. Optical metrology is given the responsibility for testing these surfaces. Fortunately, many of these surfaces can be tested in a straightforward manner.
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Hologram repositioning by an interferometric technique
Applied Optics, 1979An interferometric technique for hologram repositioning is described where the hologram is compared with the interference pattern of the reference and object waves. Analytical expressions to evaluate the accuracy of the repositioning are presented for the method. Two applications of the method in metrology for micromovement measurements are proposed.
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Imaging through scattering media by interferometric techniques
Applied Optics, 1981Imaging through scattering media such as fog is a problem with few known viable solutions. Holographic techniques have been demonstrated successfully in the laboratory, but their usefulness is often limited in field conditions by the requirement of a separate coherent reference beam.
A M, Tai, C C, Aleksoff, B J, Chang
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Specialized Interferometric Testing Techniques
Workshop on Optical Fabrication and Testing, 1990Summary not available.
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Dual-wavelength interferometric technique with subnanometric resolution
Applied Optics, 2002A new fringe subdivision method that employs a large synthetic wavelength to subdivide fringes formed by a small single wavelength is proposed. Based on this subdivision method, we demonstrate a novel dual-wavelength interferometric technique with subnanometric resolution, whose potential fringe subdivision factor derived from an evaluation of the ...
Benyong, Chen +2 more
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Advanced interferometric techniques for monitoring urban areas
2009 Joint Urban Remote Sensing Event, 2009This paper addresses techniques for the imaging and monitoring of urban areas via advanced interferometric analysis. We discuss the multidimensional SAR imaging techniques and an approach for the generation of long term time series from multisensor data. Results of the application to real ERS and Envisat data are presented.
Bonano M +5 more
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Interferometric multi-look techniques for SAR data
IEEE International Geoscience and Remote Sensing Symposium, 2003This paper addresses the benefits of the spectral domain multi-look approach for SAR interferometry. A comparison with the wide spread spatial averaging filter is included in the beginning. Next, it is shown that the flexibility of the spectral domain multi-look technique can be used for improved motion compensation and further for precisely updated ...
Scheiber, R., Bothale, V.M.
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An interferometric technique to study capillary waves
Advances in Colloid and Interface Science, 2017We describe a new interferometric technique to study gas-liquid and liquid-liquid interfaces. Bubbles and drops are subjected to an alternating electric field which excites capillary oscillations at the interface, if charged. Bubble or drop deformation is detected by the change of the internal optical path of a laser beam crossing perpendicular to the ...
Cantu', Laura +2 more
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The interferometric strain rosette technique
Experimental Mechanics, 1996An interferometric strain rosette can be used to measure three in-plane strains. The strain rosette consists of three microindentations produced on an object surface. Upon illuminating the indentations with laser light, each pair of indentations acts as a two-point source generating a pair of Young's interference fringe patterns.
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Photodegradation of melanin by an interferometric technique
Optics Letters, 2011Photodegradation of melanin thin films is investigated for a UVA wavelength of 355 nm and a UVC wavelength of 244 nm. The technique involves interferometric exposure of melanin with two coherent beams from a low-power UV laser. The periodic photodegradation-grating pattern is monitored by diffraction of a second low-power He-Ne laser. Dependence of the
C W, Farley, A, Kassu, A, Sharma
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