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本文介绍了一种利用激光照射皮肤表面,收集其具有多普勒频移的散射光来检测血细胞运动,形成皮下毛细血管血流图象的仪器。典型的毛细血管的血细胞流速为1mm/s的量级上,产生的频移为3KHz,较深的血管散射出的多普勒频移为10KHz。由于光在皮肤组织上随机散射,所以多普勒频移和血细胞流速不直接相关。绝对校准多普勒流量仪是不可能的。一般是利用多普勒光谱与皮肤中血流参数的某些相关变量来建立反映出组织中血细胞一般运动的经验公式,而不是真实的流速的测量。本仪器使用2mv的氦氖激光安放在四个光
This paper presents an instrument that utilizes laser light to irradiate the surface of the skin to collect scattered light with Doppler shift to detect blood cell movement and form a blood capillary image of subcutaneous capillaries. Typical capillaries have a blood flow rate on the order of 1 mm / s, resulting in a frequency shift of 3 kHz and a darker vessel that scatters Doppler shift of 10 kHz. Doppler shift and blood cell flow rate are not directly related as the light scatters randomly across the skin tissue. Absolute calibration Doppler flow meter is not possible. Instead of a true measure of flow rate, empirical formulas that reflect the general motion of blood cells in the tissue are generally established using Doppler spectra and certain related variables of the blood flow parameters in the skin. The instrument uses 2mv of He-Ne laser placed in four light