西安理工大学学报
西安理工大學學報
서안리공대학학보
JOURNAL OF XI'AN UNIVERSITY OF TECHNOLOGY
2015年
1期
95-99
,共5页
光纤光栅%传感%有限冲激响应(FIR)滤波%FPGA
光纖光柵%傳感%有限遲激響應(FIR)濾波%FPGA
광섬광책%전감%유한충격향응(FIR)려파%FPGA
fiber Bragg grating%sensing%FIR%FPGA
光纤光栅传感器是通过检测被测物理量引起的光纤光栅中心波长的漂移量来得到该物理量的变化，波长检测精度常受到各种噪声的限制。为了提高波长的检测精度，本文提出采用数字滤波进行去噪。分析了不同窗函数 FIR低通滤波器对光纤光栅传感信号去噪能力的影响，发现凯泽（Kaiser ）窗的通带纹波、阻带衰减以及去噪后的信噪比和均方误差均比较好，并确定了其阶数和β参数。用设计的滤波器对光栅反射谱进行了去噪处理，效果较好，尤其是在峰值波长处，光栅反射谱较平滑，峰值波长的分辨能力显著提高。最后用FPGA实现FIR滤波并对光纤光栅传感信号去噪，进一步验证了设计的FIR滤波器对光栅传感信号具有良好去噪效果。
光纖光柵傳感器是通過檢測被測物理量引起的光纖光柵中心波長的漂移量來得到該物理量的變化，波長檢測精度常受到各種譟聲的限製。為瞭提高波長的檢測精度，本文提齣採用數字濾波進行去譟。分析瞭不同窗函數 FIR低通濾波器對光纖光柵傳感信號去譟能力的影響，髮現凱澤（Kaiser ）窗的通帶紋波、阻帶衰減以及去譟後的信譟比和均方誤差均比較好，併確定瞭其階數和β參數。用設計的濾波器對光柵反射譜進行瞭去譟處理，效果較好，尤其是在峰值波長處，光柵反射譜較平滑，峰值波長的分辨能力顯著提高。最後用FPGA實現FIR濾波併對光纖光柵傳感信號去譟，進一步驗證瞭設計的FIR濾波器對光柵傳感信號具有良好去譟效果。
광섬광책전감기시통과검측피측물리량인기적광섬광책중심파장적표이량래득도해물리량적변화，파장검측정도상수도각충조성적한제。위료제고파장적검측정도，본문제출채용수자려파진행거조。분석료불동창함수 FIR저통려파기대광섬광책전감신호거조능력적영향，발현개택（Kaiser ）창적통대문파、조대쇠감이급거조후적신조비화균방오차균비교호，병학정료기계수화β삼수。용설계적려파기대광책반사보진행료거조처리，효과교호，우기시재봉치파장처，광책반사보교평활，봉치파장적분변능력현저제고。최후용FPGA실현FIR려파병대광섬광책전감신호거조，진일보험증료설계적FIR려파기대광책전감신호구유량호거조효과。
Fiber Bragg grating sensor makes acquisition to physical change by detecting the FBG central wavelength drift caused by physical change ,while the wavelength detection precision is limited by noises .To improve the detection precision in noisy circumstance ,this paper suggests that the digital filter wave to denoise .By analyzing the ability of denoising for FIR low‐pass filter with various window functions ,it is discovered that the Kaiser window has a better performance in pass‐band ripple ,stopband attenuation ,SNR and MSE ,so that its order and βparameters are determined .The designed wave filter is used to carry out the de‐noising treatment of the FBG re‐flection spectrum with good results obtained ,particularly in the peak value of wavelength .So that the FBG reflection spectrum is rather smooth and the resolution ability of peak value wave‐length is obviously improved .Finally the PPGA is used to realize FIR filter wave and to denoise fiber Bragg grating sensing signal ,and the designed FIR wave filter has further been tested to have a better denoising effects .
