Diode laser absorption spectroscopy for process control: Sensor system design methodology

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A laser absorption spectroscopy (LAS) system has been developed at Lawrence Livermore National Laboratory (LLNL) for process control. LAS has proven itself to be an accurate and reliable method to monitor both density and composition. In this paper the important features and components of an industrial LAS diagnostic are described. Application of this approach to vaporization processes requires careful selection of the species and transitions to be monitored The relative vapor pressure, hyperfine structure, isotopic frequency shifts, and electronic temperature all effect the selection of a particular transition. In this paper we describe the methodology for choosing the optimal transition ... continued below

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25 p.

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Berzins, L. V.; Anklam, T. M.; Chambers, F.; Galanti, S.; Haynam, C. A. & Worden, E. F. March 1995.

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Description

A laser absorption spectroscopy (LAS) system has been developed at Lawrence Livermore National Laboratory (LLNL) for process control. LAS has proven itself to be an accurate and reliable method to monitor both density and composition. In this paper the important features and components of an industrial LAS diagnostic are described. Application of this approach to vaporization processes requires careful selection of the species and transitions to be monitored The relative vapor pressure, hyperfine structure, isotopic frequency shifts, and electronic temperature all effect the selection of a particular transition. In this paper we describe the methodology for choosing the optimal transition or transitions. Coevaporation of a titanium-niobium alloy is used to illustrate the methodology. In a related paper, T.M. Anklam et al describe the application of this diagnostic to monitoring and controlling composition in a physical vapor deposition process of industrial interest.

Physical Description

25 p.

Notes

INIS; OSTI as DE95011801

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  • 22. international AVS conference on metallurgical coatings and thin films (ICMCTF-22), San Diego, CA (United States), 24-28 Apr 1995

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  • Other: DE95011801
  • Report No.: UCRL-JC--118757
  • Report No.: CONF-950454--1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 80398
  • Archival Resource Key: ark:/67531/metadc736998

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Office of Scientific & Technical Information Technical Reports

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  • March 1995

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  • Oct. 19, 2015, 7:39 p.m.

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  • Dec. 7, 2015, 12:26 p.m.

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Berzins, L. V.; Anklam, T. M.; Chambers, F.; Galanti, S.; Haynam, C. A. & Worden, E. F. Diode laser absorption spectroscopy for process control: Sensor system design methodology, article, March 1995; California. (digital.library.unt.edu/ark:/67531/metadc736998/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.