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Method and Appartus for Calibrating a Linear Variable Differential Transformer

Description: A calibration apparatus for calibrating a linear variable differential transformer (LVDT) having an armature positioned in au LVDT armature orifice, and the armature able to move along an axis of movement. The calibration apparatus includes a heating mechanism with an internal chamber, a temperature measuring mechanism for measuring the temperature of the LVDT, a fixture mechanism with an internal chamber for at least partially accepting the LVDT and for securing the LVDT within the heating mec… more
Date: January 18, 2005
Creator: Pokrywka, Robert J.
Partner: UNT Libraries Government Documents Department
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Lawrence Livermore National Laboratory Working Reference Material Production Pla

Description: This Lawrence Livermore National Laboratory (LLNL) Working Reference Material Production Plan was written for LLNL by the Los Alamos National Laboratory to address key elements of producing seven Pu-diatomaceous earth NDA Working Reference Materials (WRMS). These WRMS contain low burnup Pu ranging in mass from 0.1 grams to 68 grams. The composite Pu mass of the seven WRMS was designed to approximate the maximum TRU allowable loading of 200 grams Pu. This document serves two purposes: first, it … more
Date: November 4, 1998
Creator: Wong, Amy; Thronas, Denise & Marshall, Robert
Partner: UNT Libraries Government Documents Department
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Issues in Purchasing and Maintaining Intrinsic Standards

Description: Intrinsic standards are widely used in the metrology community because they realize the best level uncertainty for many metrology parameters. For some intrinsic standards, recommended practices have been developed to assist metrologists in the selection of equipment and the development of appropriate procedures in order to realize the intrinsic standard. As with the addition of any new standard, the metrology laboratory should consider the pros and cons relative to their needs before purchasing… more
Date: September 12, 2000
Creator: Pettit, Richard B.; Jaeger, Klaus & Ehrlich, Charles D.
Partner: UNT Libraries Government Documents Department
open access

Accuracy evaluation of residual stress measurements

Description: The accuracy of residual stress measurement techniques is difficult to assess due to the lack of available reference standards. To satisfy the need for reference standards, two specimens were designed and developed to provide known stress magnitudes and distributions: one with a uniform stress distribution and one with a nonuniform linear stress distribution. A reusable, portable load fixture was developed for use with each of the two specimens. Extensive bench testing was performed to determin… more
Date: May 1, 1996
Creator: Yerman, J.A.; Kroenke, W.C. & Long, W.H.
Partner: UNT Libraries Government Documents Department
open access

FY2008 Calibration Systems Final Report

Description: The Calibrations project has been exploring alternative technologies for calibration of passive sensors in the infrared (IR) spectral region. In particular, we have investigated using quantum cascade lasers (QCLs) because these devices offer several advantages over conventional blackbodies such as reductions in size and weight while providing a spectral source in the IR with high output power. These devices can provide a rapid, multi-level radiance scheme to fit any nonlinear behavior as well a… more
Date: January 1, 2009
Creator: Cannon, Bret D.; Myers, Tanya L. & Broocks, Bryan T.
Partner: UNT Libraries Government Documents Department
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Computed Tomography (CT) Standards

Description: There is currently no standardized method to check the measurement capabilities of computed tomography (CT) systems within industry. The current method to determine the functionality of CT systems is by use of a test phantom to represent the actual part to be tested. A standard method to check the software algorithms when measuring such parameters as density of a material and the size of an object is not readily available. Many different materials are evaluated by CT systems. A set of standards… more
Date: February 2, 2000
Creator: Hubert, R. R. & Beach, J. M.
Partner: UNT Libraries Government Documents Department
open access

Case for an Improved Effective-Atomic-Number for the Electronic Baggage Scanning Program

Description: Z{sub eff}, a parameter representing an 'effective atomic number' for a material, plays an important role in the Electronic Baggage Scanning Program (EBSP) to detect threats in dual-energy computed tomography (CT) baggage-scanning systems. We believe that Z{sub eff}, as defined and used on this program, does not provide the accurate representation of a material's x-ray absorption properties that is needed by the EBSP. We present the case for a new method that defines an effective atomic number … more
Date: April 5, 2011
Creator: Smith, J. A.; Martz, H. E. & Kallman, J. S.
Partner: UNT Libraries Government Documents Department
open access

An investigation of 154Eu as a high-precision multi-gamma-ray intensity calibration standard for detector arrays

Description: The decay of {sup 154}Eu has been studied using {gamma}-ray singles and {gamma}-{gamma} coincidence spectroscopy with an array of Compton-suppressed Ge detectors. Particular attention to coincidence summing in the analysis, with consideration of detailed decay cascades and angular correlation effects, suggests that previous studies have overlooked necessary corrections. It is concluded that {sup 154}Eu provides 26 {gamma}-rays that can be used for relative efficiency calibrations from 120 to 16… more
Date: October 7, 2004
Creator: Kulp, W D; Wood, J L; Krane, K S; Loats, J; Schmelzenbach, P D; Stapels, C J et al.
Partner: UNT Libraries Government Documents Department
open access

CALCULATING ACCURATE SHUFFLER COUNT RATES WITH APPLICATIONS

Description: Shufflers are used to assay uranium and other fissile elements in bulk and waste quantities. They normally require physical calibration standards to achieve the most-accurate results, but such standards are generally rare and expensive, so inappropriate standards are often used out of necessity. This paper reports on a new technique that has been developed to calculate accurate count rates, in effect simulating physical standards with rapid and inexpensive calculations. The technique has been b… more
Date: May 1, 2001
Creator: RINARD, P. M.
Partner: UNT Libraries Government Documents Department
open access

Phase reference materials for photoacoustic spectroscopy

Description: Interest in the phase of photoacoustic signals has increased greatly since the advent of phase modulation in FTIR spectroscopy. The photoacoustic phase provides information on the depth of the light-absorbing species within a solid sample. A spectroscopist needs data from a phase-reference material for standardizing phase measurements and for correcting the instrumental effects on the observed phase. Unfortunately, there is no universally accepted phase-reference material. The authors have stud… more
Date: June 1, 1999
Creator: Jones, R.; Bajic, S. & McClelland, J.
Partner: UNT Libraries Government Documents Department
open access

Test system electronic reference signal injection

Description: A concept for a method of injecting reference signals into waveform monitoring systems which has negligible effect on measurement accuracy is presented. Equations are provided which allow a test system designer to tailor the injection design to meet specific requirements. Examples of typical use are included. The signal injection concept presented has been successfully employed at GE Neutron Devices. It has been incorporated in quality assurance test systems to provide a fiducial or time zero r… more
Date: June 1, 1991
Creator: Roubik, J. C.
Partner: UNT Libraries Government Documents Department
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A Comparison of 1 T(Omega) and 10 T (Omega) High Resistance Standards Between NIST and Sandia

Description: NIST-built 10 T{Omega} and commercial 1 T{Omega} standard resistors were hand carried between NIST and Sandia for a high resistance comparison. The comparison tested the ruggedness of the new NIST-built standard resistors, provided a check of the scaling between the two laboratories, supported measurements to reestablish NIST calibration services at 10 T{Omega} and 100 T{Omega}, and demonstrated the possibility of establishing a NIST high resistance measurement assurance program (MAP). The comp… more
Date: April 23, 1999
Creator: Jarrett, Dean G.; Dziuba, Ronald F. & Kraft, Marlin E.
Partner: UNT Libraries Government Documents Department
open access

Internet-based calibration of a multifunction calibrator

Description: A new way of providing calibration services is evolving which employs the Internet to expand present capabilities and make the calibration process more interactive. Sandia National Laboratories and the National Institute of Standards and Technology are collaborating to set up and demonstrate a remote calibration of multifunction calibrators using this Internet-based technique that is becoming known as e-calibration. This paper describes the measurement philosophy and the Internet resources that… more
Date: April 17, 2000
Creator: Bunting Baca, Lisa A.; Duda, Leonard E., Jr.; Walker, Russell M.; Oldham, Nile & Parker, Mark
Partner: UNT Libraries Government Documents Department
open access

Data analysis for surface plate calibration

Description: A surface plate is used to establish a reference plane used for making precision dimensional measurements. Ideally, the surface should be perfectly flat. Since it is impossible to create a perfectly flat surface, surface plate are calibrated to determine how much they deviate from a perfectly flat surface. Once a surface plate is calibrated, the user can determine if the plate is flat enough for use in a particular application. The currently accepted method of data analysis for surface plate ca… more
Date: August 1, 1997
Creator: Burton, R.N.
Partner: UNT Libraries Government Documents Department
open access

1990 Fischer Standard study

Description: The purpose of this work is to develop a set of Titanium areal density standards for calibration and maintenance of the Fischer`s X-ray Fluorescence measurement system characterization curve program. The electron microprobe was calibrated for Titanium films on ceramic substrates using an existing set of laboratory standards (Quantity: 6 Range: 0.310 to 1.605). Fourteen source assemblies were measured and assigned values. These values are based on a mean calculation, of five separate readings, f… more
Date: September 12, 1990
Creator: Roubik, G. J.
Partner: UNT Libraries Government Documents Department
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Internet-Based Calibration of a Multifunction Calibrator

Description: A new way of providing calibration services is evolving which employs the Internet to expand present capabilities and make the calibration process more interactive. Sandia National Laboratories and the National Institute of Standards and Technology are collaborating to set up and demonstrate a remote calibration of multijunction calibrators using this Internet-based technique that is becoming known as e-calibration. This paper describes the measurement philosophy and the Internet resources that… more
Date: December 19, 2000
Creator: Bunting Baca, Lisa A.; Duda, Leonard E., Jr.; Walker, Russell M.; Oldham, Nile & Parker, Mark
Partner: UNT Libraries Government Documents Department
open access

A Statistical Review of DWPF Laboratory Data Including Measurements of the ARG-1 Standard for Batches 94 - 263.

Description: Measurements of calibration and bench standards as well as samples of ARG-1 that were performed by the DWPF Lab during the processing of batches 94 through 263 were provided to SCS for review. Three datasets, one associated with each of three preparation methods (Cold Chem, Mixed Acid, and Fusion) were included in the review. The review conducted covered several areas of investigation. Biases in these measurements relative to the reference values for the standards including ARG-1 were estimated… more
Date: November 30, 2004
Creator: Edwards, Thomas B.
Partner: UNT Libraries Government Documents Department
open access

Comparison of several contemporary ionization/mass analyzer techniques for large components of complex fossil-derived materials

Description: Coals and coal-derived samples provide a unique mixture for development and comparison of mass spectrometric techniques for high molecular weight analyses. The Argonne Premium Coal samples (APCS) are convenient for assessing classical and novel mass spectrometric techniques. Vacuum pyrolysis mass spectrometry of APCS 4 (Pittsburgh No. 8) has been reported. Alkyl-substituted aromatic compounds and hydroxy- and dihydroxy-substituted aromatic compounds were observed. Newer techniques such as laser… more
Date: February 1, 1995
Creator: Hunt, J. E. & Winans, R. E.
Partner: UNT Libraries Government Documents Department
open access

Calibration Facilities for NIF

Description: The calibration facilities will be dynamic and will change to meet the needs of experiments. Small sources, such as the Manson Source should be available to everyone at any time. Carrying out experiments at Omega is providing ample opportunity for practice in pre-shot preparation. Hopefully, the needs that are demonstrated in these experiments will assure the development of (or keep in service) facilities at each of the laboratories that will be essential for in-house preparation for experiment… more
Date: June 15, 2000
Creator: Perry, T. S.
Partner: UNT Libraries Government Documents Department
open access

Metrology measurement capabilities

Description: Since 1958, the AlliedSignal Federal Manufacturing and Technologies (FM and T) Metrology Department has developed measurement technology and calibration capability in four major areas of measurement: (1) mechanical; (2) environmental, gas, liquid; (3) electrical (D.C., A.C., RF/Microwave); and (4) optical and radiation. The capabilities developed include unique capabilities in many areas of measurement and engineering expertise to develop measurement techniques and resolve measurement problems … more
Date: February 1, 1997
Creator: Shroyer, K.
Partner: UNT Libraries Government Documents Department
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