Pulsed-Laser Generation of Ultra-Short Acoustic Pulses: Application for Thin-Film Ultrasonic Measurements.
Abstract
We demonstrate opto-acoustic generation and detection of acoustic pulses of 1 nanosecond duration in condensed matter. Such opto-acoustic pulses are at least one order of magnitude shorter than those previously reported. These narrow acoustic pulses find new application for thin-film pulse measurement which are not possible with conventional transducer techniques. Round trip echo times are measured to 1% accuracy for stainless steel films of 12 micron thickness. This provides a new high accuracy thickness measurement in a pulsed mode. Ultrasonic attenuation for the narrow acoustic pulses are very large and are also measured. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 18, 1984
- Accession Number
- ADA141874
Entities
People
- A. C. Tam
Organizations
- International Business Machines Corporation (Armonk, NY)