Abstract
Blood flow is influenced by blood pressure, geometric configurations of blood vessel, properties of blood itself and so on. Measurement of local blood velocity may be useful in evaluating the characteristics of blood flow and finding out vascular lesions. In this study, a fiber-optic LDV (laser Doppler velocimetry) sensor which was directly inserted into blood vessel was developed as a monitoring device for clinical use. By chemical etching with a HF-NH_4F buffer solution, a convex lens-like surface was formed on the fiber tip, which allowed local velocity measurement in opaque fluid including blood. The local velocity measurement was demonstrated using either LD or He-Ne laser as a light source to confirm which light source could optimize the performance of the fiber-optic LDV sensor. As a result, higher signal to noise ratio was obtained in using LD, and in high concentration of the white poster color, local velocity of pulsatile flow was measured by the fiber-optic LDV sensor with LD.
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