设计了无损检测光波沿人体经脉传输特性的实验方案，测量了658 nm光波沿人体手臂心包经脉线与旁开非经脉线方向的漫射光辐出度，分析了光波斩波频率和经脉阻滞对测量光信号的影响。结果表明,658 nm光波沿心包经脉方向和非经脉方向传输时，光强度的衰减遵循一定规律，但衰减程度存在明显的差异，这种差异性具有高度的医学统计意义(P<0.01)。研究表明斩波频率、经脉阻滞对光信号具有一定的影响，即在低频范围内(10-370 Hz)，光信号随着斩波频率的增加而相应减弱，经脉线与非经脉线方向测得光波信号的相对差异随着阻滞压力的增加而增大。研究结果对于揭示人体经脉现象的客观存在以及经脉腧穴理化特性研究具有参考价值。

An experimental scheme was established for noninvasively measuring the characteristics of light propagation along human meridian direction. The diffuse emittance of the arm skin along the pericardium meridian and non-meridian directions for 658 nm light radiation were measured. The influence of the light chopped frequency and the meridian block on the detected signal was investigated. Our study suggest that the light attenuation along both the meridian and non-meridian directions conforms to definite law. There is a high significant difference between the propagations along the meridian direction and non-meridian direction (P<0.01). Furthermore, the chopped frequency and the meridian block can affect the detected signal. The diffuse emittance signal decreases with the chopped frequency’s increment in the range of low frequency(10-370 Hz), and the relative difference of detected signal along meridian and non-meridian directions increases with the block force’s increment. These research results are important and valuable for interpreting the human meridian phenomena and the physical-chemical characteristics of acupuncture point and meridian by biomedical optics.