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对构成法布里-珀罗腔(F-P腔)的光纤布喇格光栅的传输特性进行了分析,推导了F-P腔的光强透射率和反射率的解析表达式。将F-P腔内一个光纤布拉格光栅的背面贴一压电陶瓷,通过给压电陶瓷施加扫描电压使透过F-P腔的光的波长发生改变。光纤光栅受应力、应变及温度的影响时,其反射波长要发生相应变化,当探测器探测到最大光强时,根据给压电陶瓷施加的电压变化量就可确定布喇格光栅反射波长的移位量,测量精度可达到0.01 nm。
The transmission characteristics of fiber Bragg gratings forming Fabry-Perot cavity (F-P cavity) are analyzed, and the analytic expressions of light transmittance and reflectivity of F-P cavity are deduced. A Fragment P-cavity fiber Bragg grating on the back of a piezoelectric ceramic paste, by applying a scanning voltage to the piezoelectric ceramic so that the wavelength of light through the F-P cavity changes. When the fiber grating is affected by stress, strain and temperature, its reflection wavelength should be changed accordingly. When the detector detects the maximum light intensity, the wavelength of the reflection of the Bragg grating can be determined according to the voltage variation applied to the piezoelectric ceramic Displacement, measurement accuracy can reach 0.01 nm.