Investigation of printed reflectarrays as permanent scatterers in SAR interferometry
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Abstract The use of printed reflectarrays as permanent scatterers in SAR interferometry is investigated. The required feature of a backscattered field in a fixed direction of incidence is obtained as in the usually employed corner‐reflectors, with a more stable and flat structure. A 10‐GHz prototype has been successfully designed and tested. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 18–20, 2003; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/mop.10812Cite
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An interferometer is described that is capable of measuring the deviation of a target device from a plane with an accuracy of 0.1 micro, when the interferometer-target separation is as much as 10 m. This interferometer resembles one described in 1965 by Baldwin and Whitten in that they both use a Kösters prism and a Porro prism. The present use of a laser for the light source yields nonlocalized fringes at the output that are easily monitored by an electronic fringe detector.
Prism
Interferometric visibility
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Vickers hardness test
Functionally graded material
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Porous SiC Ceramics with Multiple Pore Structure Fabricated via Gelcasting and Solid State Sintering
Porous SiC ceramics with multiple pore structures were fabricated via gelcasting and solid state sintering.A novel gelling agent of Isobam was applied and PMMA was used as both foam stabilizer and pore forming agent.The mechanical properties of porous SiC ceramics were investigated as functions of PMMA content, rotating speed of ball mill, and sintering temperature.With PMMA content increasing from 5wt% to 20wt%, the foaming effect was inhibited while the stability of bubbles increased.When the rotating speed was 220 r/min, the open porosities of the as-prepared SiC ceramics sintered at 2100 varied ℃ from 51.5% to 72.8%, and compressive strength varied from 7.9 to 48.2 MPa.With the rotating speed increasing from 220 to 280 r/min, the foaming effect was aggravated and the porosities of SiC ceramics sintered at 2100 increased.℃ While the sintering temperature increasing from 2050 to 2150 , ℃ the SiC ceramics prepared with PMMA content of 20wt% at rotating speed of 220 r/min decreased in the open porosities while increased in compressive strength.
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The interferometer of the Fourier transform spectrometer at the University of Oulu has been modified so that the maximum instrumental resolution is better than 10−3 cm−1. The resolution of the previous interferometer was 4.5 × 10−3 cm−1. The present interferometer consists of large cube corner mirrors and a large Mylar beam splitter. Each corner mirror has been made with three flat mirrors on an adjustable supporting frame. The interferometer was already in practical use in 1985. The first spectra (H2O, CO2, N2O, OCS) recorded on this interferometer have been presented in HANDBOOK OF INFRARED STANDARDS WITH SPECTRAL MAPS AND TRANSITION ASSIGNMENTS BETWEEN 3 AND 2600 μm, G. Guelachvili and K. Narahari Rao, Eds. (Academic, New York, 1986).
Beam splitter
Cube (algebra)
Intensity interferometer
Fourier transform spectroscopy
Corner reflector
Interferometric visibility
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A relatively inexpensive, versatile interferometer has been developed to evaluate the combined surface and internal properties of long, highly doped laser rods. The basic interferometer configuration, which is a modified Mach-Zehnder type, can be used for Brewster-ended as well as for square-ended rods in the pumped or unpumped condition. An unusual feature of this interferometer is that both beam splitters and mirrors are located in the same arm rather than in opposite corners as found in the conventional M-Z interferometer. Some shadowgraph pictures and interferograms of laser rods obtained with the interferometer are shown.
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Beam splitter
Intensity interferometer
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An IR Twyman-Green interferometer is described. It uses a cw CO(2) laser as a light source operating at a 10.6-microm wavelength. Theoretical analysis and experimental measurements of the relationship between the contrast of the interference fringes and the rms roughness of test surfaces are discussed. Interferometric testing results and special alignment methods are shown for rough surface optics.
Interference microscopy
White light interferometry
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Nanocrystalline material
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