Accession Number:

ADA416417

Title:

Femtosecond Photoacoustic Equipment for Materials Characterization

Descriptive Note:

Final rept. 1 Jun 2002-31 May 2003

Corporate Author:

NORTHWESTERN UNIV EVANSTON IL CENTER FOR QUALITY ENGINEERING AND FAILURE PREVENTION

Personal Author(s):

Report Date:

2003-07-01

Pagination or Media Count:

11.0

Abstract:

The objective of this project was to configure non-contact nondestructive photo-acoustic measurement systems for characterization of micro- and nano-structured material systems including thin films and coatings. Specifically, a femtosecond photo-acoustic materials characterization facility has been established. At Northwestern University, we are actively pursuing research efforts to increase the sensitivity of photo-acoustic metrology. These efforts have led to advance in laser-based ultrasonics, fiber-optic ultrasonic sensors, and photo-acoustic characterization of thin films. The femtoseconc photo-acoustic system has now extended our acoustic frequency reach to the Gigahertz range. Specific research projects that we are continuing to pursue include transient grating and pump-probe photo-acoustic experiments on very thin films, MEMS devices, and nano-structured composites. Specific material and geometric properties that can be characterized using the photo-acoustics facility include elastic moduli, thickness, and residual stress.

Subject Categories:

  • Coatings, Colorants and Finishes
  • Lasers and Masers
  • Acoustooptic and Optoacoustic Devices
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE