Measurement of the fluid-velocity profile using a self-mixing superluminescent diode

A novel optical Doppler velocimeter using a self-mixing superluminescent diode is proposed and demonstrated. The operation mechanism uses the photodiode on the back-face of a commercial superluminescent diode to detect the Doppler signal from an interferometer. Thanks to the low coherence length of the optical source, the position of the measuring volume can be easily moved into the sample under test by adjusting the reference arm length, thus allowing us to measure the velocity profile of the flowing scatterers even in turbid media. The proposed velocimeter is expected to have several industrial as well as medical applications.

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