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Development of a laser-Doppler system for measurement of velocity fields in PVT crystal growth systemsA laser-Doppler velocimetry (LDV) system capable of measuring velocities as low as 10 exp -5 m/s is presented, and a calibration system for determining the accuracy of the LDV system at these velocities is described. The results obtained in mercurous chloride crystal grown in cylindrical ampoules at 300 C, using physical vapor transport (PVT) methods, are presented. It is concluded that the overall flow pattern observed is a unicellular, asymmetric pattern between Rayleigh number of 125 and 250.
Document ID
19930049076
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jones, O. C. (NASA Headquarters Washington, DC United States)
Glicksman, M. E. (NASA Headquarters Washington, DC United States)
Lin, J. T. (NASA Headquarters Washington, DC United States)
Kim, G. T. (Rensselaer Polytechnic Inst. Troy, NY, United States)
Singh, N. B. (Rensselaer Polytechnic Inst., Troy, NY; Westinghouse Science and Technology Center Pittsburgh, PA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Crystal growth in space and related optical diagnostics; Proceedings of the Meeting, San Diego, CA, July 22, 23, 1991 (A93-33051 12-29)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Instrumentation And Photography
Accession Number
93A33073
Distribution Limits
Public
Copyright
Other

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