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You searched on: Author: Lawrence Hudson

Displaying records 1 to 10 of 87 records.
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1. An objectively-analyzed method for measuring the useful penetration of x-ray imaging systems
Published: 5/11/2016
Authors: Jack Leigh Glover, Lawrence T Hudson
Abstract: The ability to detect wires is an important capability of the cabinet x-ray imaging systems that are used in aviation security as well as the portable x-ray systems that are used by domestic law enforcement and military bomb squads. A number of ...

2. A simple method for high-precision calibration of an angle encoder using an electronic nulling autocollimator
Published: 3/9/2015
Authors: Lawrence T Hudson, M N Kinnane, Albert Henins, M H Mendenhall
Abstract: We describe a simple method for high-precision rotary angle encoder calibration. By using a redesigned electronic nulling autocollimator, a mirrored-polygon artifact is calibrated simultaneously with determining the encoder error function over a rota ...

3. New x-ray measurements shed light on discrepancy between experiment and QED
Published: 12/15/2014
Authors: Lawrence T Hudson, C T Chantler, A.T. Payne, M N Kinnane, John D Gillaspy, L F Smale, Albert Henins, J A Kimpton, E Takacs
Abstract: Quantum Electro-Dynamics (QED) is the best tested theory of our physical world, yet significant disagreements have emerged between attempts to apply QED to exotic atomic systems. A recent 15 parts-per-million (ppm) experiment on muonic hydrogen, in ...

4. Ultra-Thin Curved Transmission Crystals for High Resolving Power (up to E/¿E=6300) X-Ray Spectroscopy in the 6 keV to 13 keV Energy Range
Published: 12/9/2014
Authors: Lawrence T Hudson, John F Seely, Jack Leigh Glover, Albert Henins, Nino R. Pereira
Abstract: Ultra-thin curved transmission crystals operating in the Cauchois spectrometer geometry were evaluated for the purpose of achieving high spectral resolution in the 6 keV to 13 keV x-ray energy range. The crystals were silicon (111) and sapphire R- cu ...

5. The Metrology of a Rastered Spot of X Rays used in Security Screening
Series: Journal of Research (NIST JRES)
Report Number: 119.021
Published: 11/6/2014
Authors: Lawrence T Hudson, Jack Leigh Glover, Ronaldo Minniti
Abstract: In recent times, ionizing radiation has been used around the world to screen persons for non- medical purposes, namely to detect bulk explosives or other contraband hidden on the body including materials not registered by metal detectors. In contr ...

6. Measurement of High-Energy (10 keV to 60 keV) X-Ray Spectral Line Widths with eV Accuracy
Published: 8/8/2014
Authors: John F Seely, Jack Leigh Glover, Lawrence T Hudson, Yuri Ralchenko, Nino R. Pereira, U. Feldman, C. Di Stefan
Abstract: A high resolution crystal spectrometer (HRCS) utilizing a crystal in transmission geometry has been developed and experimentally optimized to measure the line widths of emission lines in the 10 keV to 60 keV energy range with eV accuracy. The spectro ...

7. Measurement of the O2O3O4 and O3O4O5 Super Coster-Kronig Rates in Tungsten via Asymmetric Diffraction Spectrometry
Published: 3/7/2014
Authors: Lawrence T Hudson, John F Seely, Jack Leigh Glover, Yuri Ralchenko, Nino R Pereira, Uri Feldman
Abstract: The tungsten Lγ transitions between 11 keV and 12 keV and Kα transitions from 57 keV to 60 keV were produced by a laboratory electron-bombarded x-ray source and simultaneously recorded with high-resolution by using multiple diffraction plan ...

8. High-resolution K-shell spectra from laser excited molybdenum plasma
Published: 11/1/2013
Authors: Lawrence T Hudson, C.I Szabo, P Indelicatio, John F Seely, T Ma
Abstract: X-ray spectra from Molybdenum plasmas were recorded by a Cauchois-type cylindrically bent Transmission Crystal Spectrometer (TCS). The absolutely calibrated spectrometer provides an unprecedented resolution of inner shell transitions (K x-ray radiati ...

9. A method for organic/inorganic differentiation using an x-ray forward/backscatter personnel scanner
Published: 9/10/2013
Authors: Jack Leigh Glover, Lawrence T Hudson
Abstract: A method is proposed for performing organic/inorganic materials discrimination using an x-ray forward/backscatter scanner. The method is demonstrated using a commercially available personnel security-screening system and requires only image post proc ...

10. Tungsten L Transition Line Shapes and Energy Shifts Resulting from Ionization in Warm Dense Matter
Published: 4/18/2013
Authors: Lawrence T Hudson, John F Seely, Bruce V. Weber, D. G. Phipps, Nino R. Pereira, D Mosher, K. Slabkowska, M. Polasik, J Rzadkiewicz, S Hansen, Uri Feldman, Joseph W. Schumer
Abstract: High resolution spectra of the W L transitions in the energy range 8 keV to 12 keV from warm dense plasmas generated by the Naval Research Laboratory‰s Gamble III pulsed power machine were recorded by a transmission-crystal x-ray spectrometer with ± ...

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  • SP 250-XX: Calibration Services
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