Accession Number : ADD014131

Title :   Method and Apparatus for Transient Unit Cell Measurement.

Descriptive Note : Patent, Filed 29 Feb 88, patented 11 Apr 89,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Whitlock, Robert R ; Wark, Justin S ; Hauer, Allan

Report Date : 11 Apr 1989

Pagination or Media Count : 10

Abstract : A method and apparatus is disclosed for measuring the lattice parameters of a single crystal material while that material is undergoing a transient shock wave. In a first embodiment, a first target is located at a preselected position in space with respect to a single crystal to be measured. A first laser beam pulse is transmitted through a beam block to the crystal to produce a transient shock wave in part of the crystal. A second laser been pulse, synchronized to the first laser beam pulse, is transmitted to the first target to cause the first target to produce first and second sets of x-rays which are Bragg-diffracted from shocked and unshocked atomic planes of the crystal as the crystal is undergoing the shock wave. A first x-ray detector records the positions of the first and second sets of Bragg-diffracted x-rays to provide a first measurement of the lattice parameters of the crystal. In a second embodiment, a third laser beam pulse, synchronized to the second laser beam pulse, is transmitted to a second target to cause the second target to produce third and fourth sets of x-rays which are Bragg-diffracted from shocked and unshocked atomic planes of the crystal as the crystal is undergoing the shock wave. A second x-ray detector records the positions of the third and fourth sets of Bragg-diffracted x-ray to provide a second measurement of the lattice parameters of the crystal. Patents. (MJM)

Descriptors :   *SHOCK WAVES, *SINGLE CRYSTALS, *TARGETS, CELLS, DETECTORS, LASER BEAMS, LASERS, MATERIALS, MEASUREMENT, PATENTS, PULSED LASERS, RECORDS, TRANSIENTS, X RAYS

Subject Categories : Physical Chemistry
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE