Skip to main content
×
×
Home

Crystal orientation measurements using transmission and backscattering

  • Wing S. Chan (a1), Merlin L. Mah (a1), Donald E. Voight (a2), Joan J. Fitzpatrick (a3) and Joseph J. Talghader (a1)...
Abstract

A method has been devised and tested for measuring the c-axis orientation of crystal grains in thin sections of glacier ice. The crystal orientation and grain size of ice are of great interest to glaciologists since these parameters contain information on the prior thermal and flow history of the ice. The traditional method of determining c-axis orientation involves a transmission measurement through an ice sample, a process that is time-consuming and therefore impractical for obtaining a continuous record. A reflection- or backscatter-based method could potentially be used inside boreholes, with bubbles as reflectors to avoid such drawbacks. The concept demonstration of this paper is performed on ice slices, enabling a direct comparison of accuracy with traditional methods. Measurements of the crystal orientations (θ, ϕ) in 11 grains showed an average error of ±0.8° in ϕ, with no grain error >1.4°. Measurements of θ showed an average error of ±8.2° on ten grains, with unexplained disagreement on the remaining grain. Although the technique is applied specifically to glacier ice, it should be generally applicable to any transparent birefringent polycrystalline material.

  • View HTML
    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Crystal orientation measurements using transmission and backscattering
      Available formats
      ×
      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Crystal orientation measurements using transmission and backscattering
      Available formats
      ×
      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Crystal orientation measurements using transmission and backscattering
      Available formats
      ×
Copyright
References
Hide All
Azuma, N (1994) A flow law for anisotropic ice and its application to ice sheets. Earth Planet. Sci. Lett., 128(3–4), 601614 (doi: 0.1016/0012–821X(94)90173–2)
Clarke, D and Grainger, JF (1971) Polarised light and optical measurement. (International Monographs in Natural Philosophy 35) Pergamon, Oxford
Cuffey, KM and Paterson, WSB (2010) The physics of glaciers, 4th edn. Butterworth-Heinemann, Oxford
Goodman, JW (2005) Introduction to Fourier optics, 3rd edn. Roberts, Englewood, CO
Hansen, DP and Wilen, LA (2002) Performance and applications of an automated c-axis ice-fabric analyzer. J. Glaciol., 48(160), 159170 (doi: 10.3189/172756502781831566)
Landauer, JK and Plumb, H (1956) Measurements on anisotropy of thermal conductivity of ice. SIPRE Res. Pap. 16
Langway, CC Jr (1958) Ice fabrics and the universal stage. SIPRE Tech. Rep. 62
Petrenko, VF and Whitworth, RW (1999) Physics of ice. Oxford University Press, Oxford
Rigsby, GP (1951) Crystal fabric studies on Emmons Glacier, Mount Rainier, Washington. J. Geol., 59(6), 590598
Wilen, LA (2000) A new technique for ice-fabric analysis. J. Glaciol., 46(152), 129139 (doi: 10.3189/172756500781833205)
Wilen, LA, Di Prinzio, CL, Alley, RB and Azuma, N (2003) Development, principles, and applications of automated ice fabric analyzers. Microsc. Res. Techn., 62(1), 218 (doi: 10.1002/jemt.10380)
Wilson, CJL, Russell-Head, DS and Sim, HM (2003) The application of an automated fabric analyzer system to the textural evolution of folded ice layers in shear zones. Ann. Glaciol., 37, 717 (doi: 10.3189/172756403781815401)
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Glaciology
  • ISSN: 0022-1430
  • EISSN: 1727-5652
  • URL: /core/journals/journal-of-glaciology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords

Metrics

Full text views

Total number of HTML views: 4
Total number of PDF views: 29 *
Loading metrics...

Abstract views

Total abstract views: 59 *
Loading metrics...

* Views captured on Cambridge Core between 10th July 2017 - 18th August 2018. This data will be updated every 24 hours.