28 April 2000 Simple coherence method for blood flow detection
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Proceedings Volume 3915, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications IV; (2000) https://doi.org/10.1117/12.384147
Event: BiOS 2000 The International Symposium on Biomedical Optics, 2000, San Jose, CA, United States
The blood flow velocity registration method using an optical coherent photo detection in a diode laser is presented. The dependence of signal on distance and non-conventional self- mixing interferences has bene discussed. Also, an experimental device with pigtail laser diode is developed. This device is able to measure blood flow velocity or velocity of liquid suspension containing particles with size of erythrocytes. During experiments the liquid suspension containing polymer micro spheres with spheres diameter 7.0 microns and density 1.05 g/cc was used instead of real blood. The basis of the registration is the self-mixing that occurs in diode laser cavity when the radiation scattered back by the particles into the laser interferes with the field inside it and causes a changes of a laser pump current. National Instruments software LabView for Windows is used for output signal digitalization and pre-processing purposes. There is good correlation between calculated and measured with proposed device values of different velocities. Described device as application of self-mixing method highlighted the significant advantages of simplicity, compactness, and robustness as well as the self-aligning and self-detecting abilities of such methods when compared with the use of conventional interferometric methods.
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Kalju Meigas, Kalju Meigas, Hiie Hindrikus, Hiie Hindrikus, Rain Kattai, Rain Kattai, Jaanus Lass, Jaanus Lass, "Simple coherence method for blood flow detection", Proc. SPIE 3915, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications IV, (28 April 2000); doi: 10.1117/12.384147; https://doi.org/10.1117/12.384147

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