Single Doppler methods remained a limited application for LDFM. Various distances effect between laser diode and spectrometer is important role in this application techniques especially medicine physics. In this research aimed to determine the effect of distance between the spectrum analyzer and laser diode by single Doppler Method on perfusion of the Artery. This is the position of arteriosclerosis diagnosis Results shown Change the distance between LD (wavelengths 780 nm) and spectrum analyzer (2,4,6, and 8 cm) that intensity incresed to 4 cm when enter light through position of artery, but decresed when incresed distance 8 cm. results is prove the increased blood velocity also increases the single signal, At distance 6 cm s is relatively higher for velocity having propagated a long distance, and therefore their contribution to the perfusion effect to the blood concentration and the measurement velocity will decrease compared to the distance 2 and 4 cm.
According test the results from samples of clinically normal for ages(20-59) and diabetes mellitusfor measure of blood concentration and resolved velocity by a single shift of laser Doppler flowmetry based on illuminated laser beam on the foot has been reported in this paper of patient safety and noninvasively. The main research to arrive a simple method noninvasive and get more information about the resolved velocity to diagnose the nature of disorder blood flow for different person by using low power laser source, coherent light without thermal effect upon living tissue.
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