• 作者： 周傅心; 江彥瑾
• 作者服務機構： 台灣大學應用力學研究所
• 中文摘要： 本文研究邁克森式和極化光纖感測器應用於振動量測和控制，將光纖之一小段置於樑結構，由光纖因樑結構振動產生之應變所造成的光程變化，量測樑結構之應變和振動。 樑結構之振動控制，係依據結構振動之理論，以控制結構上一點或數點之振動，而控制結構之振動，結構振動主動控制系統由光纖感測器，壓電致動器，和反相放大器組成，利用將光讖感測器量測得到之振動，輸出一對應結構振態力（state-dependent vibratory force）之電信號，此電信號經放大和反相處理後，回授和感測器同置之壓電致動器，壓電致動器將此對應動態控制力（dynamic control force )，產生與原振動反相之控制運動，因而控制結構之振動。
• 英文摘要： Michelson interferometric and polarimetric optical fiber sensors for sensing and control of thevibration of a cantilevered beam are studied in this paper. A small section of the sensing fiber arm isattached to the beam to sense the vibration of the beam. The optical phase of the light passing throughthe fiber is modulated by the strain field of the vibrating beam A Michelson interferometric sensor detectsthis phase modulation by interference between the lights propagating in the sensing fiber and in a referencefiber. A polarimetric sensor utilizes interference between two modes propagating in a fiber to sense thestrain induced in the fiber. The active homodyne technique is used to process the signal to obtain anoutput which is proportional to the vibration of the beam. A closed-loop active control system comprises a combination of a colocated fiber sensor and apiezoelectric actuator, and an inverting power amplifier The sensor sensed signal is amplified and inverted,and then fed into the actuator to generate a dynamical control force on the body. Experimental resultsshowed that the vibration of the cantilevered beam was substantially reduced by applying a single controlsystem with the Michelson and polarimetric fiber sensors.
• 中文關鍵字： Michelson; Polarimetric; colocated; active control
• 英文關鍵字： --