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Title: Absolute calibration of the OMEGA streaked optical pyrometer for temperature measurements of compressed materials

Experiments in high-energy-density physics often use optical pyrometry to determine temperatures of dynamically compressed materials. In combination with simultaneous shock-velocity and optical-reflectivity measurements using velocity interferometry, these experiments provide accurate equation-of-state data at extreme pressures (P > 1 Mbar) and temperatures (T > 0.5 eV). This paper reports on the absolute calibration of the streaked optical pyrometer (SOP) at the Omega Laser Facility. The wavelength-dependent system response was determined by measuring the optical emission from a National Institute of Standards and Technology–traceable tungsten-filament lamp through various narrowband (40 nm-wide) filters. The integrated signal over the SOP’s ~250-nm operating range is then related to that of a blackbody radiator using the calibrated response. We present a simple closed-form equation for the brightness temperature as a function of streak-camera signal derived from this calibration. As a result, error estimates indicate that brightness temperature can be inferred to a precision of <5%.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
1316; LLNL-JRNL-698798
Journal ID: ISSN 0034-6748; RSINAK; 2016-113; 2271; 1316; TRN: US1701197
Grant/Contract Number:
NA0001944; AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Rochester, NY (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); LLNL Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 36 MATERIALS SCIENCE
OSTI Identifier:
1341873
Alternate Identifier(s):
OSTI ID: 1333763; OSTI ID: 1376029

Gregor, M. C., Boni, R., Sorce, A., Kendrick, J., McCoy, C. A., Polsin, D. N., Boehly, T. R., Celliers, P. M., Collins, G. W., Fratanduono, D. E., Eggert, J. H., and Millot, M.. Absolute calibration of the OMEGA streaked optical pyrometer for temperature measurements of compressed materials. United States: N. p., Web. doi:10.1063/1.4968023.
Gregor, M. C., Boni, R., Sorce, A., Kendrick, J., McCoy, C. A., Polsin, D. N., Boehly, T. R., Celliers, P. M., Collins, G. W., Fratanduono, D. E., Eggert, J. H., & Millot, M.. Absolute calibration of the OMEGA streaked optical pyrometer for temperature measurements of compressed materials. United States. doi:10.1063/1.4968023.
Gregor, M. C., Boni, R., Sorce, A., Kendrick, J., McCoy, C. A., Polsin, D. N., Boehly, T. R., Celliers, P. M., Collins, G. W., Fratanduono, D. E., Eggert, J. H., and Millot, M.. 2016. "Absolute calibration of the OMEGA streaked optical pyrometer for temperature measurements of compressed materials". United States. doi:10.1063/1.4968023. https://www.osti.gov/servlets/purl/1341873.
@article{osti_1341873,
title = {Absolute calibration of the OMEGA streaked optical pyrometer for temperature measurements of compressed materials},
author = {Gregor, M. C. and Boni, R. and Sorce, A. and Kendrick, J. and McCoy, C. A. and Polsin, D. N. and Boehly, T. R. and Celliers, P. M. and Collins, G. W. and Fratanduono, D. E. and Eggert, J. H. and Millot, M.},
abstractNote = {Experiments in high-energy-density physics often use optical pyrometry to determine temperatures of dynamically compressed materials. In combination with simultaneous shock-velocity and optical-reflectivity measurements using velocity interferometry, these experiments provide accurate equation-of-state data at extreme pressures (P > 1 Mbar) and temperatures (T > 0.5 eV). This paper reports on the absolute calibration of the streaked optical pyrometer (SOP) at the Omega Laser Facility. The wavelength-dependent system response was determined by measuring the optical emission from a National Institute of Standards and Technology–traceable tungsten-filament lamp through various narrowband (40 nm-wide) filters. The integrated signal over the SOP’s ~250-nm operating range is then related to that of a blackbody radiator using the calibrated response. We present a simple closed-form equation for the brightness temperature as a function of streak-camera signal derived from this calibration. As a result, error estimates indicate that brightness temperature can be inferred to a precision of <5%.},
doi = {10.1063/1.4968023},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = {2016},
month = {11}
}