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An integrated laser blood flowmeter

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3 Author(s)
Higurashi, E. ; NTT Microsystem Integration Labs., Kanagawa, Japan ; Sawada, Renshi ; Ito, Takahiro

We have constructed a very small and lightweight blood flowmeter using micromachining and surface mounting techniques for a wearable health monitoring system. The hybrid integrated structure of the optical system incorporates a InGaAsP-InP distributed feedback laser diode (DFB-LD) with a wavelength of 1310 nm, an edge-illuminated photodiode (PD) and a polyimide waveguide on silicon substrate (2 mm × 3 mm). This integrated flowmeter can be positioned directly on the tissue and permits real-time monitoring of capillary microcirculation. In-vivo measurements of blood perfusion in a finger confirm the feasibility of the blood flowmeter.

Published in:

Lightwave Technology, Journal of  (Volume:21 ,  Issue: 3 )