Accession Number : ADA141874

Title :   Pulsed-Laser Generation of Ultra-Short Acoustic Pulses: Application for Thin-Film Ultrasonic Measurements.

Descriptive Note : Technical rept.,

Corporate Author : IBM RESEARCH LAB SAN JOSE CA

Personal Author(s) : Tam,A C

PDF Url : ADA141874

Report Date : 18 May 1984

Pagination or Media Count : 19

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)

Descriptors :   *Pulsed lasers, *Sound generators, *Short pulses, *Short range(Time), *Acoustics, Acoustic detectors, Thin films, Transducers, Stainless steel, Thickness, Measurement, Acoustic attenuation, Ultrasonic frequencies, Echoes

Subject Categories : Acoustic Detection and Detectors
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE