Results of x-ray mirror round-robin metrology measurements at the APS, ESRF, and SPring-8 optical metrology laboratories

2005 ◽  
Author(s):  
Lahsen Assoufid ◽  
Amparo Rommeveaux ◽  
Haruhiko Ohashi ◽  
Kazuto Yamauchi ◽  
Hidekazu Mimura ◽  
...  
Keyword(s):  
Round Robin ◽  
Optical Metrology ◽  
X Ray

scholarly journals Precision of the Residual Stress determined by X-ray Diffraction: Summery and Limits

2019 ◽  
Author(s):  
Eckehard Mueller
Keyword(s):  
Residual Stress ◽  
Compressive Residual Stress ◽  
Round Robin ◽  
Surface Treatments ◽  
X Ray Diffraction ◽  
Measurement Standard ◽  
Passenger Cars ◽  
Round Robin Test ◽  
X Ray ◽  
Mechanical Surface

Today components specially for passenger cars are weight optimized. Often it is done by mechanical surface treatments. Therefore, the amount of compressive residual stress induced by the treatment must be known. The measurement is very often done by x-ray diffraction. But how precise can you determine (and not directly measured) the amount? A big question is the calibration of the equipment. A specimen must be designed and calibrated by round robin test, because no measurement standard is available.

Correlation methods in optical metrology with state-of-the-art x-ray mirrors

2018 ◽  
Author(s):  
Valeriy V. Yashchuk ◽  
Gary Centers ◽  
Gevork S. Gevorkyan ◽  
Ian Lacey ◽  
Brian V. Smith
Keyword(s):  
State Of The Art ◽  
Optical Metrology ◽  
X Ray ◽  
Correlation Methods

XRF of cultural heritage materials: Round-robin IV—paint on canvas

2009 ◽  
Vol 24 (2) ◽  
pp. 124-129 ◽  
Author(s):  
C. Namowicz ◽  
K. Trentelman ◽  
C. McGlinchey
Keyword(s):  
Cultural Heritage ◽  
Round Robin ◽  
X Ray ◽  
Xrf Analysis ◽  
Works Of Art ◽  
Working Practices ◽  
Xrf Spectroscopy ◽  
Representative Samples ◽  
Shielding Effects

To establish standard working practices and further understanding of the application of X-ray fluorescence (XRF) spectroscopy to works of art and cultural heritage materials, a series of round-robin tests have been conducted biannually since 2002. In 2008 the round-robin explored the application of XRF to the study of paintings on canvas. Thirteen samples, consisting of both modern and traditional pigments on canvas, were distributed to 25 participating institutions for analysis. The samples were designed to explore common challenges encountered in the XRF analysis of painted works including peak overlaps, sum peaks, layering/shielding effects, detection of low-Z pigments, and modern pigments. The results from representative samples highlighting each topic are discussed.

scholarly journals Long, elliptically bent, active X-ray mirrors with slope errors <200 nrad

2017 ◽  
Vol 24 (3) ◽  
pp. 615-621 ◽  
Author(s):  
Ioana T. Nistea ◽  
Simon G. Alcock ◽  
Paw Kristiansen ◽  
Adam Young
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Free Electron Laser ◽  
State Of The Art ◽  
Optical Metrology ◽  
Optical Surface ◽  
High Quality ◽  
Element Analysis ◽  
Bending Performance ◽  
X Ray

Actively bent X-ray mirrors are important components of many synchrotron and X-ray free-electron laser beamlines. A high-quality optical surface and good bending performance are essential to ensure that the X-ray beam is accurately focused. Two elliptically bent X-ray mirror systems from FMB Oxford were characterized in the optical metrology laboratory at Diamond Light Source. A comparison of Diamond-NOM slope profilometry and finite-element analysis is presented to investigate how the 900 mm-long mirrors sag under gravity, and how this deformation can be adequately compensated using a single, spring-loaded compensator. It is shown that two independent mechanical actuators can accurately bend the trapezoidal substrates to a range of elliptical profiles. State-of-the-art residual slope errors of <200 nrad r.m.s. are achieved over the entire elliptical bending range. High levels of bending repeatability (ΔR/R = 0.085% and 0.156% r.m.s. for the two bending directions) and stability over 24 h (ΔR/R = 0.07% r.m.s.) provide reliable beamline performance.

Optical metrology for the segmented optics on the Constellation-X spectroscopy x-ray telescope

2004 ◽  
Author(s):  
David A. Content ◽  
David Colella ◽  
Theo Hadjimichael ◽  
John P. Lehan ◽  
Joseph McMann ◽  
...  
Keyword(s):  
Optical Metrology ◽  
X Ray

Results of X-Ray Powder Diffraction Round Robin Tests with Corundum Plates and Powder Samples

1995 ◽  
Vol 39 ◽  
pp. 571-577
Author(s):  
V. Valvoda ◽  
D. Rafaja ◽  
R. Jenkins
Keyword(s):  
Powder Material ◽  
Powder Diffraction ◽  
Round Robin ◽  
Specimen Preparation ◽  
Round Robin Test ◽  
X Ray ◽  
Intensity Measurements ◽  
Powder Diffractometer ◽  
Powder Samples ◽  
Line Positions

Repetitions of the round robin test on powder diffractometer sensitivity and round robin test of intensity measurements, using two almost identical groups of participants, enabled a comparison to be made of results obtained in different tests. Two forms of corundum test samples were used: (i) sintered plates in tests A8 and A9, and (ii) powder samples in test Bl . A rough comparison of the influence of different methods of specimen preparation from the powder material in different laboratories in test Bl is thus possible with respect to the (almost) uniform sintered plates used in tests A8 and A9. The parameters under investigation were the line positions (and/or inter-planar d-spacing) and intensities of eleven reflections occurring at the 20 angles ranging from 25° to 136° for Cu Kα-radiation

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