基于悬臂梁的光纤光栅匹配解调系统  

Fiber Bragg grating matching demodulation system based on cantilever beam

作　　者：赵立民[1] 刁春暖[1] 王鑫[1] 

机构地区：[1]沈阳工业大学信息科学与工程学院,沈阳110178

出　　处：《沈阳工业大学学报》2008年第6期672-674,683,共4页Journal of Shenyang University of Technology

基　　金：辽宁省自然科学基金资助项目(20052044);辽宁省教育厅基金资助项目(202063304)

摘　　要：为了开发一种高精度低成本的光纤光栅解调系统,提出了一种基于悬臂梁的光纤光栅匹配解调方案,即利用ADC0804对PD信号进行采集,将采集的数据交给PC机进行处理,根据处理结果对步进电机进行控制;利用步进电机的角位移与控制脉冲的精确同步,通过机械装置带动悬臂梁自由端移动,实现对匹配光栅的拉伸控制,使其与传感光栅的中心波长一致,从而达到对传感光栅解调的目的.实验结果表明,系统的匹配灵敏度可达到1.3×10-3nm/step,完全满足一般光纤光栅的解调要求.For developing a high precision and low cost fiber grating demodulation system, a fiber Bragg grating matching demodulation scheme based on cantilever beam was proposed. In the scheme, ADC0804 was adopted to collect PD signal, and PC was used for data processing. A stepping motor was controlled by the processed data. Using precise synchronization between angular displacement and control pulse of the stepping motor, the free side of cantilever beam was moved by mechanical device to bring the center wavelength of sensor grating into correspondence with that of matching grating. Thus, the demodulation of the sensor grating was achieved. The experimental result indicates that the matching sensitivity of the system is approximately 1.3× 10^- 3 nm/step, which can completely satisfy the demodulation of general fiber Bragg grating.

关 键 词：匹配 解调 悬臂梁 步进电机 光纤BRAGG光栅 

分 类 号：TN253[电子电信—物理电子学]