Measuring vibration by using fiber Bragg grating and demodulating it by blazed grating
A method of measuring vibration by using fiber Bragg grating (FBG) and demodulating the spectrum by blazed grating is introduced. The sensor system is made of a simple supported beam with a FBG adhered to its upper surface. A blazed grating is used to demodulate the changing spectrum that is got from the sensor system, and a line charge-coupled device (CCD) is used to accept the diffraction spectrum.Through analyzing the number of the CCD's pixels, we can get the amplitude of vibration and the change of the temperature. The experimental results show that the vibration amplitude of the exciter matches the detected signal under the stable frequency. The temperature shift and vibration signal are also successfully separated.
作 者： 郭晓金 殷宗敏 宋宁 作者单位： The State Key Laboratory on Fiber-Optic Local Area Networks and Advanced Optical Communication Systems, Shanghai Jiaotong University, Shanghai 200030 刊 名： 中国光学快报(英文版) ISTIC EI 英文刊名： CHINESE OPTICS LETTERS 年，卷(期)： 2004 2(7) 分类号： 关键词：