30 April 1999 Coherent photodetection for pulse profile registration
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Proceedings Volume 3598, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications III; (1999); doi: 10.1117/12.347490
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States
Abstract
The arterial pulse profile registration method using an optical coherent photodetection in a diode laser is presented. An experimental device with pigtail laser diode has been developed. This device is able to detect pulsation profiles of major arteries with potentially useful information including pulse wave velocity and profile of pulse pressure. The basis of the registration is the self- mixing that occurs in the diode laser cavity when the radiation, scattered back by the skin into the laser, interferes with the field inside it and causes the changes of the laser pump current. These changes are being registered in two different ways simultaneously; with using a photodiode accommodated in the rear facet of the diode laser package and with a help of small resistance resistor from the chain of laser pump current. The delay of pulse wave in different regions of human body is measured relatively to ECG signal. Registered signals are sorted after digitalization and pre-processed using LabView for Windows environment.
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Kalju Meigas, Hiie Hindrikus, Rain Kattai, Jaanus Lass, "Coherent photodetection for pulse profile registration", Proc. SPIE 3598, Coherence Domain Optical Methods in Biomedical Science and Clinical Applications III, (30 April 1999); doi: 10.1117/12.347490; http://dx.doi.org/10.1117/12.347490
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KEYWORDS
Semiconductor lasers

Doppler effect

Arteries

Optical fibers

Laser resonators

Reflectivity

Skin

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