提出并實(shí)驗(yàn)了一種探測(cè)光纖光柵波長(zhǎng)移動(dòng)的新方法。該方法用一組與各個(gè)傳感光纖光柵的參數(shù)對(duì)應(yīng)相同的光纖光柵作為濾波元件,用抖動(dòng)倍頻的方法跟蹤傳感光纖光柵的反射光譜的峰值點(diǎn),同時(shí)采用高分辨率的光柵尺作為系統(tǒng)的讀出設(shè)備,徹底消除了壓電陶瓷的非線性性及滯后性帶來的誤差,從而得到高精度的測(cè)量結(jié)果。
關(guān)鍵詞: 測(cè)量;光纖光柵;傳感器
Abstract : A new method is presented to detect the wavelength shift on in2fiber Bragg gratings. The system employs a series of in2fiber Bragg gratings ,having the same parameters as the sensing in2fiber Bragg gratings ,as filter elements. Furthermore ,the system tracks the maximum wavelength of the reflected spectrum of in2fiber Bragg gratings through dithering and doubling the frequency. A grating with high sensitivity is used to read the output of the system. The non2 linearity and hysteresis of PZT have been erased thoroughly ,so the accuracy of the system is improved a lot .
Key words : measurement ;in2fiber Bragg gratings(FBG) ;senso