Accession Number : ADA325846
Title : Laser Generation of Ultrasound.
Descriptive Note : Final rept.,
Corporate Author : BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA
Personal Author(s) : Rudd, Michael J. ; Doughty, Jeffrey A.
PDF Url : ADA325846
Report Date : FEB 1983
Pagination or Media Count : 69
Abstract : An experimental and analytical study has been conducted into the use of carbon dioxide TEA lasers to generate ultrasonic waves. When the laser is fired at a plastic target, waves with a peak-to-peak pressure of 10 bars are generated. Teflon and Mylar were the most effective. There was no damage to the plastic, even after several hundred shots. This was not the case for glass or aluminum with a much smaller absorption depth and lower conversion efficiency. The sound wave could be directed by using an off axis zone plate. This generated a 10 MHz tone burst, 45 degree off axis with a duration of 4 microseconds. A theoretical analysis of the phenomena is given which accounts for the waveforms and peak pressures measured.
Descriptors : *ULTRASONICS, *SOUND WAVES, *PLASTICS, *TEA LASERS, NONDESTRUCTIVE TESTING, RADIATION ABSORPTION, PRESSURE, CARBON DIOXIDE LASERS, LASER DAMAGE, POLYETHYLENE PLASTICS, TETRAFLUOROETHYLENE RESINS, THERMOELASTICITY.
Subject Categories : Lasers and Masers
Distribution Statement : APPROVED FOR PUBLIC RELEASE