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Proceedings Paper

Fluorescence-based temperature measurement in laser-induced vapor bubbles
Author(s): Kin Foong Chan; T. Joshua Pfefer; Daniel X. Hammer; E. Duco Jansen; Martin Frenz; Ashley J. Welch
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Paper Abstract

A fluorescence-based temperature probe (optrode) was designed to measure temperature within laser-induced vapor bubbles. The optrode consisted of a 400-micrometer optical fiber with a rhodamine B-doped polyurethane film attached to the fiber tip. The film exhibited a fluorescence decay time of 4 ns, and the measured fluorescence yield was temperature dependent in the range from 20 to 110 degrees Celsius. A Ho:YAG laser ((lambda) equals 2.12 micrometer, (tau) p equals 250 microseconds) with a pulse energy of 256 plus or minus 7 mJ delivered through a fiber was used to produce the vapor bubbles. The bubbles reached maximum expansion 200 microseconds after the onset of the laser pulse and had an average lifetime of 350 microseconds. The temperature was measured by positioning the optrode within the vapor bubble and exciting its fluorescent film-coated tip with a nitrogen dye laser ((lambda) equals 540 nm, (tau) p equals 500 ps). At maximum expansion, the temperatures in the vapor bubbles were approximately 61 degrees Celsius, indicating sub-atmospheric saturated vapor pressures. The vapor pressure at maximum expansion was confirmed by Rayleigh's equation.

Paper Details

Date Published: 13 May 1998
PDF: 11 pages
Proc. SPIE 3254, Laser-Tissue Interaction IX, (13 May 1998); doi: 10.1117/12.308174
Show Author Affiliations
Kin Foong Chan, Univ. of Texas at Austin (United States)
T. Joshua Pfefer, Univ. of Texas at Austin (United States)
Daniel X. Hammer, Univ. of Texas at Austin (United States)
E. Duco Jansen, Vanderbilt Univ. (United States)
Martin Frenz, Univ. Berne (Switzerland)
Ashley J. Welch, Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 3254:
Laser-Tissue Interaction IX
Steven L. Jacques; Jeff Lotz, Editor(s)

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