OSA's Digital Library

Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 27 — Sep. 20, 1999
  • pp: 5724–5733

Beam misalignments and fluid velocities in laser-induced thermal acoustics

Stefan Schlamp, Eric B. Cummings, and Hans G. Hornung  »View Author Affiliations


Applied Optics, Vol. 38, Issue 27, pp. 5724-5733 (1999)
http://dx.doi.org/10.1364/AO.38.005724


View Full Text Article

Enhanced HTML    Acrobat PDF (256 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Beam misalignments and bulk fluid velocities can influence the time history and intensity of laser-induced thermal acoustics (LITA) signals. A closed-form analytic expression for LITA signals incorporating these effects is derived, allowing the magnitude of beam misalignment and velocity to be inferred from the signal shape. It is demonstrated how instantaneous, nonintrusive, and remote measurement of sound speed and velocity (Mach number) can be inferred simultaneously from homodyne-detected LITA signals. The effects of different forms of beam misalignment are explored experimentally and compared with theory, with good agreement, allowing the amount of misalignment to be measured from the LITA signal. This capability could be used to correct experimental misalignments and account for the effects of misalignment in other LITA measurements. It is shown that small beam misalignments have no influence on the accuracy or repeatability of sound speed measurements with LITA.

© 1999 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(050.2770) Diffraction and gratings : Gratings
(120.6780) Instrumentation, measurement, and metrology : Temperature
(120.7280) Instrumentation, measurement, and metrology : Vibration analysis
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing

History
Original Manuscript: April 1, 1999
Revised Manuscript: June 21, 1999
Published: September 20, 1999

Citation
Stefan Schlamp, Eric B. Cummings, and Hans G. Hornung, "Beam misalignments and fluid velocities in laser-induced thermal acoustics," Appl. Opt. 38, 5724-5733 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-27-5724

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited