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Heterodyne detection for measuring extinction coefficient in mammalian tissue

L Poupinet and G Jarry

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Optical extinction in mammalian tissues is measured at 633 nm by using heterodyne detection. Its sensitivity, directivity and signal to noise ratio allows one to detect coherent photons after attenuation of up to 10 optical densities. This method permits one to detect unscattered photons passing through more than 5 mm of different tissues such as: muscle, skin and liver.


PACS

87.64.K- Spectroscopy

06.20.fb Standards and calibration

87.19.Ff Muscles

Subjects

Instrumentation and measurement

Medical physics

Biological physics

Dates

Issue 6 (November 1993)



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