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  • Vol. 19, Iss. 17 — Sep. 1, 1994
  • pp: 1361–1363

Laser-induced thermal acoustics: simple accurate gas measurements

E. B. Cummings  »View Author Affiliations


Optics Letters, Vol. 19, Issue 17, pp. 1361-1363 (1994)
http://dx.doi.org/10.1364/OL.19.001361


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Abstract

Laser-induced thermal acoustics (LITA), an optical four-wave mixing technique, has been used for sensitive measurement of the sound speed, thermal diffusivity, acoustic damping rate, and complex susceptibility of a gas. In LITA, laser-induced acoustic waves scatter laser light into a coherent, modulated signal beam. A simple expression accurately describes the signal. Atmospheric sound speeds accurate to 0.5% and transport properties accurate to 30% have been measured in a single shot without calibration. LITA spectra have been taken of weak spectral lines of NO2 in concentrations of less than 50 parts in 109. Signal reflectivities up to 10−4 are estimated.

© 1994 Optical Society of America

History
Original Manuscript: February 17, 1994
Published: September 1, 1994

Citation
E. B. Cummings, "Laser-induced thermal acoustics: simple accurate gas measurements," Opt. Lett. 19, 1361-1363 (1994)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-19-17-1361


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References

  1. E. B. Cummings, GALCIT Rep. FM92-2 (California Institute of Technology, Pasadena, Calif., 1992).
  2. R. J. D. Miller, R. Casalegno, K. A. Nelson, M. D. Fayer, Chem. Phys. 72, 371 (1982). [CrossRef]
  3. M. Buntine, D. Chandler, C. Hayden, “Detection of excited-state absorption in water via laser-induced grating spectroscopy,” J. Chem. Phys. (to be published).
  4. R. W. Boyd, Nonlinear Optics (Academic, New York, 1992), Chap. 8, pp. 327–331.
  5. B. J. Berne, R. Pecora, Dynamic Light Scattering (Wiley, New York, 1976), Chap. 10, pp. 229–232.
  6. A. C. Eckbreth, Laser Diagnostics for Combustion Species and Temperature (Abacus,Cambridge, Mass., 1988), pp. 249–252.

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