DocumentCode :
1221374
Title :
An Instrument to Measure Cutaneous Blood Flow Using the Doppler Shift of Laser Light
Author :
Watkins, Dennis ; Holloway, G. Allen, Jr.
Author_Institution :
Center for Bioengineering, University of Washington
Issue :
1
fYear :
1978
Firstpage :
28
Lastpage :
33
Abstract :
A system utilizing the Doppler shift of monochromatic laser light has been developed to measure blood flow in skin. Light from a low power (S mW) He-Ne laser is coupled into a quartz fiber and transmitted to the skin. This light is reflected from both the nonmoving tissues (reference beam) and moving red blood cells (Doppler shifted beam), received by a plastic fiber, and transmitted back to a photodiode where optical heterodyning occurs. The heterodyned output signal, which is proportional to the Doppler shift frequency, is amplified and both RMS and dc values obtained. The RMS value is weighted against the backscattered light intensity using the measured dc value as an index of total received power. This is used as the output flow velocity value.
Keywords :
Blood flow; Doppler shift; Fiber lasers; Fluid flow measurement; Instruments; Laser beam cutting; Laser beams; Optical coupling; Power lasers; Skin; Blood Flow Velocity; Doppler Effect; Humans; Lasers; Methods; Skin;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.1978.326374
Filename :
4122767
Link To Document :
بازگشت