The theory of optical fiber displacement sensor based on F-P is introduced.The flexivity of a beam, which is acted on by 3-division point force, is measured by dial gauge and F-P displacement sensor.

• 介绍了基于F-P原理的光纤位移计的基本原理，对一简支梁在三分点加载的中部挠度进行了测量，测得的结果与普通百分表的测量值相比较，两者吻合很好。