摘要
针对基于可调谐法布里珀罗(F-P)滤波器的光纤光栅解调系统存在波长解调准确度不够高的问题,从理论上系统地分析了在解调过程中对光纤光栅B ragg波长进行直线拟合的可行性,即光纤光栅B ragg波长与F-P滤波器的调谐电压之间存在线性相关性。在实验研究的基础上,用最小二乘法对光纤光栅B ragg波长和F-P滤波器的调谐电压进行直线拟合,结果表明:它们之间的确存在密切的线性相关性。为提高拟合的效果,提出了分段直线拟合,它可以使测量误差降低至少1个数量级,从而提高了F-P滤波器光纤光栅解调系统的准确度。
Refer to the demodulation system of fiber grating Bragg wavelength with a Fabry-Perot filter, of which the demodulation accuracy is not high enough, the feasibility of straight line fitting of fiber grating Bragg wavelength is analyzed theoretically. Bragg wavelength of fiber grating and tuning voltage of Fabry-Perot filter is linear. It is also proved by experiment that there is strong linear dependency between them. In order to improve the fitting effect, a sectional straight line fitting algorithm based on least square method is proposed. The demodulation accuracy of the system is improved.
出处
《传感器与微系统》
CSCD
北大核心
2006年第6期25-27,共3页
Transducer and Microsystem Technologies
基金
国家自然科学基金资助项目(60477028)
