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Proceedings Paper

Time-resolved photoacoustic Doppler characterization of flow using pulsed excitation
Author(s): Adi Sheinfeld; Sharon Gilead; Avishay Eyal
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Paper Abstract

A new approach for implementing pulsed excitation enables time-resolved characterization of flow, using the photoacoustic Doppler effect. The method yields two-dimensional maps of the Doppler shift vs. axial position of flowing absorbing particles. It takes advantage of the unique flexibility and accuracy of external modulation which offers excellent control over the parameters of the pulsed optical excitation. The experimental setup comprised a CW tunable laser source operating in the fiber optic communications band (1510-1620nm) followed by an electro-optic modulator, electronically driven by an arbitrary waveform generator. Using the technique the flow of a suspension of carbon particles in a C-flex tube was measured over a wide range of velocities from 18 mm/sec up to 200mm/sec.

Paper Details

Date Published: 23 February 2010
PDF: 6 pages
Proc. SPIE 7564, Photons Plus Ultrasound: Imaging and Sensing 2010, 75643N (23 February 2010); doi: 10.1117/12.858340
Show Author Affiliations
Adi Sheinfeld, Tel Aviv Univ. (Israel)
Sharon Gilead, Tel Aviv Univ. (Israel)
Avishay Eyal, Tel Aviv Univ. (Israel)

Published in SPIE Proceedings Vol. 7564:
Photons Plus Ultrasound: Imaging and Sensing 2010
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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