Accession Number : AD0293290

Title :   THE USE OF A LASER AS A LIGHT SOURCE FOR PHOTOGRAPHIC LIGHT SCATTERING FROM POLYMER FILMS

Corporate Author : MASSACHUSETTS UNIV AMHERST POLYMER RESEARCH INST

Personal Author(s) : RHODES,MARION B. ; KEEDY,DANIEL A. ; STEIN,RICHARD S.

Report Date :

Pagination or Media Count : 1

Abstract : A light-weight portable self-contained laser and power supply which produces a 0.1 joule plane polarized pulse having wavelength 6943A from a 90 degree cut 2 in. x 1/4 in. ruby crystal excited by a 400 joule pulse from two xenon flash lamps was used as a light source for this study. A V sub v polariz d scatteri g pattern from a mil thick medium density polyethylene film obtained with a single fl sh of the laser of duration about 500 micron sec is compared with a similar picture for the s me sample requiring a 4.5 hour exposure with conventional apparatus. The laser pattern is somewhat larger in size because of the longer wavelength. Pictures were obtained in single flashes equivalent to 4 day conventional exposures. It is possible by taking a number of pictures in succession of follow time dependent processes such as crystalliz tion rates, orientation relaxation, annealing and changes accompanying dynamic strain. (Author)

Descriptors :   *LASERS, *OPTICS, *PHOTOGRAPHIC FILM, *POLYMERS, ETHYLENES, LABORATORY EQUIPMENT, LIGHT, RUBY, SCATTERING, SOURCES

Distribution Statement : APPROVED FOR PUBLIC RELEASE