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Tomographic imaging of fluid flows by the use of two-tone frequency-modulation spectroscopy

By P Kauranen, H. M Hertz and Sune Svanberg


Diode laser absorption measurements obtained with two-tone frequency-modulation spectroscopy (TTFMS) are combined with tomography to produce spatially resolved quantitative images of fluid flows. The high sensitivity, good accuracy, and high stability of TTFMS absorption measurements permit optical-absorption tomography to be performed with low noise on extremely weakly absorbing objects. The method is demonstrated on a small oxygen flow with a GaAlAs diode laser operating near 760 nm and with an absorption sensitivity of 1:106

Topics: Atom and Molecular Physics and Optics
Publisher: 'The Optical Society'
Year: 1994
DOI identifier: 10.1364/OL.19.001489
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