skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A multi-wavelength, high-contrast contact radiography system for the study of low density aerogel foams

Abstract

A multi wavelength, high contrast contact radiography system has been developed to characterize density variations in ultra-low density aerogel foams. These foams are used to generate a ramped pressure drive in materials strength experiments at the National Ignition Facility (NIF) and require precision characterization in order to reduce errors in measurements. The system was used to characterize density variations in carbon and silicon based aerogels to ~10.3% accuracy with ~30 μm spatial resolution. The system description, performance and measurement results collected using a 17.8 mg/cc carbon based JX–6 (C 20H 30) aerogel are discussed in this manuscript.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [1];  [3];  [3]
  1. National Security Technologies, LLC. (NSTec), Mercury, NV (United States)
  2. University of California at Berkeley; University of California at Berkeley
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Nevada Test Site/National Security Technologies, LLC (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1358318
Alternate Identifier(s):
OSTI ID: 1267531; OSTI ID: 1338223
Report Number(s):
DOE/NV/25946-2663; LLNL-JRNL-719698
Journal ID: ISSN 0034-6748
Grant/Contract Number:
AC52-06NA25946; AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 7; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; low-density aerogel foams, multi-wavelength, high-contrast contact, radiography system, charge coupled devices, spatial resolution, anodes; 42 ENGINEERING

Citation Formats

Opachich, Y.P., Koch, J.A., Haugh, M. J., Romano, E., Lee, J., Huffman, E., Weber, F. A., Bowers, J. W., Benedetti, L. R., Wilson, M., Prisbrey, S.T., Wehrenberg, C. E., Baumann, T. F., Lenhardt, J. M., Cook, A., Arsenlis, A., and Remington, B. A. A multi-wavelength, high-contrast contact radiography system for the study of low density aerogel foams. United States: N. p., 2017. Web. doi:10.1063/1.4958826.
Opachich, Y.P., Koch, J.A., Haugh, M. J., Romano, E., Lee, J., Huffman, E., Weber, F. A., Bowers, J. W., Benedetti, L. R., Wilson, M., Prisbrey, S.T., Wehrenberg, C. E., Baumann, T. F., Lenhardt, J. M., Cook, A., Arsenlis, A., & Remington, B. A. A multi-wavelength, high-contrast contact radiography system for the study of low density aerogel foams. United States. doi:10.1063/1.4958826.
Opachich, Y.P., Koch, J.A., Haugh, M. J., Romano, E., Lee, J., Huffman, E., Weber, F. A., Bowers, J. W., Benedetti, L. R., Wilson, M., Prisbrey, S.T., Wehrenberg, C. E., Baumann, T. F., Lenhardt, J. M., Cook, A., Arsenlis, A., and Remington, B. A. Sat . "A multi-wavelength, high-contrast contact radiography system for the study of low density aerogel foams". United States. doi:10.1063/1.4958826. https://www.osti.gov/servlets/purl/1358318.
@article{osti_1358318,
title = {A multi-wavelength, high-contrast contact radiography system for the study of low density aerogel foams},
author = {Opachich, Y.P. and Koch, J.A. and Haugh, M. J. and Romano, E. and Lee, J. and Huffman, E. and Weber, F. A. and Bowers, J. W. and Benedetti, L. R. and Wilson, M. and Prisbrey, S.T. and Wehrenberg, C. E. and Baumann, T. F. and Lenhardt, J. M. and Cook, A. and Arsenlis, A. and Remington, B. A.},
abstractNote = {A multi wavelength, high contrast contact radiography system has been developed to characterize density variations in ultra-low density aerogel foams. These foams are used to generate a ramped pressure drive in materials strength experiments at the National Ignition Facility (NIF) and require precision characterization in order to reduce errors in measurements. The system was used to characterize density variations in carbon and silicon based aerogels to ~10.3% accuracy with ~30 μm spatial resolution. The system description, performance and measurement results collected using a 17.8 mg/cc carbon based JX–6 (C20H30) aerogel are discussed in this manuscript.},
doi = {10.1063/1.4958826},
journal = {Review of Scientific Instruments},
number = 7,
volume = 87,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

Save / Share:
  • A multi-wavelength, high contrast contact radiography system has been developed to characterize density variations in ultra-low density aerogel foams. These foams are used to generate a ramped pressure drive in materials strength experiments at the National Ignition Facility and require precision characterization in order to reduce errors in measurements. The system was used to characterize density variations in carbon and silicon based aerogels to ∼10.3% accuracy with ∼30 μm spatial resolution. The system description, performance, and measurement results collected using a 17.8 mg/cc carbon based JX–6 (C{sub 20}H{sub 30}) aerogel are discussed in this manuscript.
  • Cited by 1
  • A multi wavelength, high contrast contact radiography system has been developed to characterize density variations in ultra-low density aerogel foams. These foams are used to generate a ramped pressure drive in materials strength experiments at the National Ignition Facility (NIF) and require precision characterization in order to reduce errors in measurements. The system was used to characterize density variations in carbon and silicon based aerogels to ~10.3% accuracy with ~30 μm spatial resolution. The system description, performance and measurement results collected using a 17.8 mg/cc carbon based JX–6 (C 20H 30) aerogel are discussed in this manuscript.
    Cited by 1
  • Anti-scatter grids have been widely used to reject scatter and increase the perceptibility of low-contrast object in chest radiography; however they also attenuate the primary x-rays, resulting in a substantial degradation of primary information. Compensation for this degradation requires the use of higher exposure technique hence higher dose to the patient. A more efficient approach to reject scatter is the slot-scan imaging technique which employs a narrow scanning x-ray fan beam in conjunction with a slit or slot shaped solid state detector or an area detector used with an aft-collimator. With this approach, scatter can be rejected effectively without themore » need to attenuate primary x-rays. This paper demonstrates an electronic aft-collimation method, referred to as the alternate line erasure and readout (ALER) technique, for implementing the slot-scan digital radiography with a modern flat-panel detector. With this technique, instead of first exposing the detector and then reading the image line by line, the image line on the leading edge of the scanning fan beam is reset to erase the scatter accumulated prior to the arrival of the fan beam x-rays, while the image line on the trailing edge of the scanning fan beam is read out to acquire the image signals following the fan-beam exposure. These reset and readout processes are alternated and repeated as the x-ray fan beam scans across the detector. An anthropomorphic chest phantom was imaged to evaluate the scatter rejection ability and the low-contrast performance for the ALER technique and compare them with those for the anti-scatter grid method in full-field chest imaging. With a projected beam width of 16 mm, the slot-scan/ALER technique resulted in an average reduction of the scatter-to-primary ratios by 81%, 84%, 82%, and 86% versus 65%, 73%, 74%, and 73% with the anti-scatter grid method in the lungs, mediastinum, retrocardium, and subdiaphragm, respectively. The average CNR for the slot-scan/ALER technique was found to improve by 135%, 133%, 176%, and 87% versus 15%, 15%, 38%, and -11% with the anti-scatter grid method in the mediastinum, retrocardium, subdiaphragm, and lungs, respectively. These results demonstrated that the slot-scan/ALER technique can be used to achieve equally effective scatter rejection but substantially higher low-contrast performance than the anti-scatter grid method.« less
  • Knowledge of the density of aerogel foams used in high energy density physics experiments is crucial for simulating and understanding the results of experiments. An average density for the foams is gravimetrically determined, but provides no information on the uniformity of the density. X-ray radiography is used to determine the density uniformity of the foams and the average density of the foams. A comparison between a monochromatic and polychromatic method of determining the density from the x-ray radiography is performed and compared to the gravimetric results.