基于可调谐法布里—珀罗滤波器的驱动系统设计.docVIP

摘要 光纤光栅(fiber Bragg grating，FBG)(Fabry．Perot，F-P)(giant magnetostrictive material，GMM)(piezoelectric，PZT)通滤波后依然存在噪声导致信号失真的问题，根据FBG的反射谱特性对信号进行了局部高斯拟合，保证了求取峰值时间的准确性。 分析了串联型和并联型的实时校正方案，选择并完善了并联型方案。最后设计了一种基于可调谐F-P滤波器的多点FBG解调系统，此系统根据48个参考点采用快速分段算法确定PZT驱动电压一波长函数，使用此函数实时校正微驱动器件的非线性误差以及可调谐F-P滤波器的结构性误差，从而能够提高系统的测量精度。此外，设计了以现场可编程门阵列(field programmable gatearray，FPGA) Abstract Fiber Bragg gratings are one type of developing fast passive fiber devices in recent years．As sensing element，they encode the sensing information in a wavelength form，which are their distinguished advantages over other transducers．FBG sensors have the characteristics of compact structure，easy to integrate and bury．Also they are modulated by wavelength and immune to electromagnetic interference and light intensity fluctuation．Multi-sensing like stress and temperature sensing are achieved by wavelength，time and space division multiplexing technologies．FBG sensors are mainly applied in the fields of civilian，aviation，ship，electric power and petroleum．Many demodulation techniques and methods for FBG sensors have been reported such as the fiber unbalanced Mach-Zehnder interferometer，edge filters，and matched fibre gratings filters and tunable fiber Fabry-Perot(F-P)interferomcter．Due to the advantages of high sensitivity,wide tunable range，the fiber F-P interferometer demodulation uses micro-driving device to change the microcavity for scanning spectrum of the FBGs，which is more sutable for multi-point demodulating．Therefore，a FBG demodulation method based on the tunable fiber F-Pinterferometer is deeply studied． Absorption loss in the fiber interfaces，effects of the finite multi-beam interference and the unparalleled reflection plates on the F-P interferometer performance are given here．Then the parameters and design requirements of the tunable F-P interferometer are presented．A driver based on gradient magnetic field force and a driver based on electric field force are designed by simulati