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  • Absolute interferometric tests of spherical surfaces based on . . .
    Traceability of interferometric form measurements requires characterization of the reference wavefront We investigate absolute tests for spherical surfaces where the form errors of both reference and test surface are estimated by minimizing the difference in measurements obtained at various positions and orientations of the test surface This approach yields an estimate for the test surface
  • Testing for spherical and elliptical symmetry
    We construct new testing procedures for spherical and elliptical symmetry based on the characterization that a random vector X with finite mean has a …
  • Absolute interferometric tests of spherical surfaces based on . . .
    We investigate absolute tests for spherical surfaces where the form errors of both reference and test surface are estimated by minimizing the difference in measurements obtained at various positions and orientations of the test surface This approach yields an estimate for the test surface errors without changing experimental settings, such as
  • Absolute testing of spherical surfaces - Optica Publishing Group
    Absolute testing of spheres by interferometry has appeared several times in the technical literature The procedure was originally proposed for the Twyman-Green interferometer and later applied to Fizeau interferometers 1,2,3 It requires three measurements of the part: two at the confocal position, rotating the part 180° between measurements
  • Foucault test - Telescope Optics
    FIGURE 53A: Geometry of the Foucault test in determining how close is mirror surface to that of a paraboloid Unlike sphere (blue), where normal to the surface at any zonal height leads to the same point - the center of curvature - thus every zone focuses point-object placed at the center of curvature back onto itself, paraboloid (red) flattens out toward the edge, with the surface normals
  • Basic Interferometry and Optical Testing - University of Arizona
    by interfering a nontilted plane wave and a spherical wave (A plane wave can be thought of as a spherical wave with an infinite radius of curvature ) Figure 16 4d shows that the interference fringes in plane B are essentially straight equi-spaced fringes (These fringes are still hyperbolas, but in the limit of large
  • TESTS OF MACHINED DEEP SPHERICAL SHELLS UNDER EXTERNAL . . . - DTIC
    the elastic and inelastic ranges before the collapse strength of spherical shells may be predicted with the high degree of accuracy nomall, required for the design of undersea vehicles, first, tests of accurately fabricated ull spherical shells or deep spherical shells with ideal boundaries are needed to provide a reference
  • Shaking table tests on spherical sliding bearings taking eccentricity . . .
    Next, the load cell with the connector is removed and shake table tests are carried out to investigate the response characteristics of the SSB under weight eccentricities and uplifting 3 1 Shake table tests with evenly distributed weight First, shake table tests are carried out where five weights are evenly loaded on each column
  • Absolute interferometric tests of spherical surfaces based on . . .
    A simple novel method for the absolute interferometric testing of spherical surfaces is presented This approach yields an estimate for test surface errors without changing experimental settings
  • FreeFall Tests Spherical Antennas, NASAs Largest Balloon
    FreeFall Tests Spherical Antennas at 159,000 feet on NASA’s Largest Balloon Innovative antennas provide high-bandwidth communications for small satellites FreeFall Aerospace, a Tucson-based startup founded by Chris Walker and Doug Stetson, recently demonstrated its wide field of view, electronically steerable, high-gain antennas for small satellites
  • TestSphere | Ministry of Testing
    Testing is a creative job and just like any artist, musician, writer, we can find ourselves out of ideas We suffer Tester’s block Thankfully, TestSphere can give you plenty of inspiration for your next testing adventure “Today, using TestSphere as I’m actually testing I’ve laid down cards on my desk around areas of concern interest
  • Zygo’s Guide to Typical Interferometer Setups
    Prism and Corner Cube Testing 5: Transmission Sphere Selection 6: Concave Surface Figure 6: Convex Surface Figure 7: Two or More Simultaneous Measurement Channels 7: Slow Concave Surface Figure (Moderately-Long Radii) 8: Slow Convex Surface Figure (Moderately-Long Radii) 8: Noncontact Radius of Curvature and Figure 9: Lens System
  • Testing Spherical Symmetry Based on Statistical Representative . . . - MDPI
    This paper introduces a novel chisquare test for spherical symmetry, utilizing statistical representative points The proposed representative-point-based chisquare statistic is shown, through a Monte Carlo study, to considerably improve the power performance compared to the traditional equiprobable chisquare test in many high-dimensional cases While the test requires relatively large sample
  • TESTS OF STIFFENED AND UNSTIFFENED MACHINED SPHERICAL SHELLS UNDER . . .
    completed tests of two series of machined spherical shells1 1 '1 2 which more closely fulfilled the assumptions of linear theory than accomplished by the specimens tested in the earlier experiments These tests demon-strated the effects of initial departures from sphericity, together with the normally less serious effects of variations in
  • 光刻物镜波像差绝对检测技术综述 - OE Journal
    光刻物镜是光刻机核心部件，其波像差大小决定着光刻机的分辨率和套刻精度。随着光刻机性能的逐步提升，光刻物镜波像差要求已经降低到0 5 nm (RMS)以下，这对波像差的检测是一个极大的挑战。现行的光刻物镜波像差检测方法(如哈特曼法，剪切干涉法和点衍射法等)的检测精度往往受限于其系统





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