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

1994; Optica Publishing Group; Volume: 19; Issue: 18 Linguagem: Inglês

10.1364/ol.19.001489

1539-4794

P. Kauranen, Hans M. Hertz, Sune Svanberg,

Electrical and Bioimpedance Tomography

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.