Fiber sensor used in detecting radial vibration of high rotating speed shaft

Optical fiber measuring technique is adopted to detect radial vibration of a high speed rotating shaft in aerial impeller pump and the principle of the detecting system is introduced in detail in this paper. A new type fiber gauge head has been developed, and relevanted compensatory approach is given. Also, the displacement characteristic modulating function is educed and the emulator curve is provided through studying of the system. Experimental results show that the system can eliminate the infection from light intensity fluctuation, fiber flexural loss and surface reflection index and detect the radial vibration of high speed rotating shaft in aerial impeller pump under the surrounding of strong electromagnetic interference and high temperature. Experiments also show that amplitude of radial vibration increases monotonously with rotation speed of the shaft ranging from 1000 r/min to 10000 r/ min, it agrees with the physical situation.