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Author: johannes soons
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1. 2D and 3D Topography Comparisons of Toolmarks Produced from Consecutively Manufactured Chisels and Punches.
Published: 5/20/2014
Authors: Xiaoyu A Zheng, Johannes A Soons, Robert Meryln Thompson, John Villanova, Taher Kakal
Abstract: A 2009 report by the National Academies [1] recommended strengthening the scientific basis of procedures and criteria employed by the forensic science specialty of toolmark identification. The current method of comparison and determination of ide ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914887

2. NIST SURFACE ROUGHNESS AND STEP HEIGHT CALIBRATIONS, Measurement Conditions and Sources of Uncertainty
Published: 3/18/2014
Authors: Theodore Vincent Vorburger, Thomas B Renegar, Xiaoyu A Zheng, Jun-Feng Song, Johannes A Soons, Richard M Silver
Abstract: NIST methods for calibration of surface roughness parameters and step height are described. The surface roughness parameters currently being measured include roughness average (Ra), root mean square (rms) roughness (Rq), average maximum height of the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915207

3. Applications of Surface Metrology in Firearm Identification
Published: 1/8/2014
Authors: Xiaoyu A Zheng, Johannes A Soons, Theodore Vincent Vorburger, Jun-Feng Song, Thomas B Renegar, Robert Meryln Thompson
Abstract: Surface metrology is commonly used to characterize functional engineering surfaces. The technologies developed offer opportunities to improve forensic toolmark identification. Toolmarks are created when a tool comes into contact with a surface an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914401

4. Applications of Surface Metrology in Toolmark Identification
Published: 1/8/2014
Authors: Xiaoyu A Zheng, Johannes A Soons, Theodore Vincent Vorburger, Jun-Feng Song, Thomas B Renegar, Robert Meryln Thompson
Abstract: Surface metrology is commonly used to characterize functional engineering surfaces. The technologies developed offer opportunities to improve forensic toolmark identification. In 2009, a report by the National Academies called into question, amon ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913337

5. Holographic Radius Test Plates
Published: 9/7/2013
Authors: Quandou Wang, Johannes A Soons, Ulf Griesmann
Abstract: We evaluate a method for testing the radius of spheres with a hologram that consists of a pair of nested Fresnel zone lenses. The hologram is positioned in the collimated test beam of a Fizeau interferometer. The inner zone lens generates a focus at ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914508

6. The Effect of Tip Size in Calibration of Surface Roughness Specimens with Rectangular Profiles
Published: 9/2/2013
Authors: Jun-Feng Song, Thomas B Renegar, Johannes A Soons, Balasubramanian Muralikrishnan, John S Villarrubia, Xiaoyu A Zheng, Theodore Vincent Vorburger
Abstract: For the calibration of rectangular and trapezoidal profile roughness specimens, stylus tip will increase profile peak width and decrease valley width, which may cause the Ra changes (either increase or decrease, depends on the profile shape). Someti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911850

7. Graphene Epitaxial Growth on SiC(0001) for Resistance Standards
Published: 6/3/2013
Authors: Mariano A. Real, Eric Lass, Fan-Hung Liu, Tian T. Shen, George R Jones, Johannes A Soons, David B Newell, Albert Davydov, Randolph E Elmquist
Abstract: A well-controlled technique for high-temperature epitaxial growth on 6H-SiC(0001) substrates is shown to allow development of monolayer graphene that exhibits promise for precise metrological applications. Face-to-face (FTF) and face-to-graphite (FTG ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911731

8. Absolute interferometric tests of spherical surfaces based on rotational and translational shears
Published: 9/13/2012
Authors: Johannes A Soons, Ulf Griesmann
Abstract: 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 diff ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911749

9. Measurement of the diameter variation and refractive index inhomogeneity of a fused silica sphere using four-surface phase-shifting interferometry
Published: 9/9/2012
Authors: Chu-Shik Kang, Ulf Griesmann, Johannes A Soons
Abstract: The diameter variation and refractive index inhomogeneity of a fused silica sphere were measured with a frequency-shifting Fizeau interferometer in a four-surface configuration. The phase-shifting algorithms to analyze the interference signals for ea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911048

10. Phase-shifting algorithms for the interferometric measurement of form error, diameter variation and refractive index inhomogeneity of fused silica spheres
Published: 9/9/2012
Authors: Chu-Shik Kang, Ulf Griesmann, Johannes A Soons
Abstract: High-precision spheres have many applications in precision engineering and metrology, such as the calibration of transmission spheres for interferometry, density standards for mass metrology, and spherical gyroscope rotors. For these applications it ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910820



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