Assessment of the Vulnerability and Lethality of Aerospace Systems. Volume 2. Laser Coupling Measurements
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1986
- Accession Number
- ADA207062
Entities
People
- Bavard S. Holmes
Organizations
- SRI International