The central one of the fiber probe is used for transmitting laser beam, the others having same spaces to the center one are used for receiving scatteredsignal.
在装置中间，其中一根光纤用于传输入射激光，周围多根光纤与中心光纤等间隔，用于接收血液中的散射光。
2
However, the scattered light is extremely weak and therefore yields a very low signal.
然而，这种散射光极其微弱，因此只产生一个非常弱的信号。
3
Going even lower, there is a more subtle, scattered, and more medially distributed region of abnormally high signal.