ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
We designed a new module of Laser Doppler Anemometry (LDA) with fiber opticalsystem, which is mainly comprised of a laser diode, optical fibers and a two dimensional (2D)photodetector. The fiber optical system involved a laser diode (VCSEL, Copax Inc.) with 850 nmwavelength, single mode fiber (Prime Optical Fiber Inc.), half coupler and two fiber collimators.The 2D photodetector made by silicon PIN photodiode is aligned between the two collimators with39° beams cross angle and all the components were set into a rectangle case, which have coin’s sizeand can be accommodated by two same set of these components. We added anticoagulant andantiseptic into fresh chicken blood and diluted it with normal saline, and then put the diluted bloodinto a beaker with a motor in the liquid. The diluted blood was pumped by the motor into anaqueduct which is connected to glass aqueduct, and back to the beaker to form a circulation system.In the experiments, we evaluate the relationships among the blood cell velocity and diameter ofglass tube, temperature variation of blood, and concentrations of blood. By analyzing the results ofthese experiments, the main factor that affects the precision of velocity measurement is the crossangle of two injected laser beams and the intensity of scattering light. The module constructed byoptical fiber light can precisely measure the velocity of blood flow at most 5% error
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1355.pdf
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