Accession Number:

ADA207062

Title:

Assessment of the Vulnerability and Lethality of Aerospace Systems. Volume 2. Laser Coupling Measurements

Descriptive Note:

Technical rept. 1 Sep 1984-15 Apr 1986

Corporate Author:

SRI INTERNATIONAL MENLO PARK CA

Personal Author(s):

Report Date:

1986-05-31

Pagination or Media Count:

60.0

Abstract:

Piezoresistant gages were used to measure the surface pressure histories produced by pulsed lasers on targets either in air or in a vacuum. A new vapor-deposited ytterbium gage was developed for these measurements. This gage has improved temporal response over older ytterbium gage designs. Calculations relating surface pressure to gage resistance change showed that pressure rise times of about 10 ns can be measured with this gage. In addition to the surface pressure measurements, total impulse was measured during the experiment series in air. The pressure and impulse measurements in air were made using neodymium-glass laser 1.06 micron wavelength with a pulse width of 30 ns, pulse energies from 100 to 1000 J, and spot sizes of 1 and 2 cm diameter. The pressure measurements in a vacuum were made using an XeF laser 3.532 micron wavelength with a pulse width of 1.5 microsec, pulse energies from 168 to 241 J, and spot sizes of 8 and 12.4 mm diameter. Keywords Laser coupling, Wave propagation, Stress gages, Laser target interactions.

Subject Categories:

  • Lasers and Masers
  • Test Facilities, Equipment and Methods
  • Plasma Physics and Magnetohydrodynamics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE