Non-contact optical three dimensional liner metrology.

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Description

We optically captured the 'as-built' liner geometry of NTLX (near term liner experiments) for Shiva Star using ultra-precision ranging lasers. We subsequently verified the resulting digitized geometry against the 3D CAD model of the part. The results confirmed that the Liner contours are within designed tolerances but revealed subtle fabrication artifacts that would typically go undetected. These features included centimeters long waviness and saddle and bulge regions of 1 micron or less in magnitude. The laser technology typically provided 10 micron spatial resolution with {+-}12 nanometer ranging precision. Atlas liners in the future may have to be diamond turned and ... continued below

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6 p.

Creation Information

Sebring, R. J. (Robert J.); Anderson, W. E. (Wallace E.); Bartos, J. J. (Jacob J.); Garcia, F. (Fermin); Randolph, B. (Blaine); Salazar, M. A. (Mike A.) et al. January 1, 2001.

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Description

We optically captured the 'as-built' liner geometry of NTLX (near term liner experiments) for Shiva Star using ultra-precision ranging lasers. We subsequently verified the resulting digitized geometry against the 3D CAD model of the part. The results confirmed that the Liner contours are within designed tolerances but revealed subtle fabrication artifacts that would typically go undetected. These features included centimeters long waviness and saddle and bulge regions of 1 micron or less in magnitude. The laser technology typically provided 10 micron spatial resolution with {+-}12 nanometer ranging precision. Atlas liners in the future may have to be diamond turned and will have the centimeter wavelength and 100 angstrom amplitude requirements. The advantages of using laser technology are (1) it avoids surface damage that may occur with conventional contact probes and (2) dramatically improves spatial resolution over CMM, capacitance and inductance type probes. Our work is the result of a perceived future need to develop precision, non-contact, liner inspection techniques to verify geometry, characterize machining artifacts and map wall thickness on delicate diamond turned surfaces. Capturing 'as-built' geometry in a non-contact way coupled with part-to-CAD verification software tools creates a new metrology competency for MST-7.

Physical Description

6 p.

Source

  • Submitted to: Pulsed Power Plasma Sciences Conference, Las Vegas, NV, June 17-22, 2001.

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  • Report No.: LA-UR-01-3227
  • Grant Number: none
  • Office of Scientific & Technical Information Report Number: 975541
  • Archival Resource Key: ark:/67531/metadc931381

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  • January 1, 2001

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  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 4:29 p.m.

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Sebring, R. J. (Robert J.); Anderson, W. E. (Wallace E.); Bartos, J. J. (Jacob J.); Garcia, F. (Fermin); Randolph, B. (Blaine); Salazar, M. A. (Mike A.) et al. Non-contact optical three dimensional liner metrology., article, January 1, 2001; United States. (digital.library.unt.edu/ark:/67531/metadc931381/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.