光纤被比作电线,但它与电线是有区别的。光纤的弯曲损失和光纤同光学元件的耦合系数对外部来的刺激非常敏感,因此在传输中光的强度很容易变化。鉴于这种事实,在光纤传感器的结构上应予以注意。在光纤传感器中,造成光强度变化的主要原因有如下几点:(1)光源的输出变化。 Fiber is likened to a wire, but it is different from a wire. The bending loss of an optical fiber and the coupling coefficient of an optical fiber with an optical element are very sensitive to external stimuli, so the intensity of light is easily changed during transmission. In view of this fact, attention should be paid to the structure of the optical fiber sensor. In the optical fiber sensor, the main reason that causes the light intensity to change has the following points: (1) The light source output changes.