Accession Number : ADA141876

Title :   Optical Generation and Detection of Acoustic Pulse Profiles in Gases for Novel Ultrasonic Absorption Spectroscopy.

Descriptive Note : Technical rept.,

Corporate Author : IBM RESEARCH LAB SAN JOSE CA

Personal Author(s) : Tam,A C ; Leung,W P

PDF Url : ADA141876

Report Date : 22 May 1984

Pagination or Media Count : 19

Abstract : We demonstrate a new all-optical, frequency-multiplexed and fast technique for gas-phase ultrasonic absorption spectroscopy. A pulsed laser produces a short-duration acoustic pulse in the gas sample, and the acoustic pulse profiles at two distances are monitored by focused continuous probe beams. Fourier decompositions of these probe deflection signals provide the absorption spectrum, and examples for CO2 + H2O mixture are given Ultrasonic propagation speeds in the MHz regime are also obtained for several gases.

Descriptors :   *Absorption spectra, *Ultrasonics, Acoustic waves, Pulsed lasers, Optical detection, Gases, Pulses

Subject Categories : Lasers and Masers
      Acoustic Detection and Detectors
      Acoustics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE