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本文报导了用光纤布拉格光栅和长周期光栅结合的传感器系统对油气井下应力和温度实现同时在线检测。实验中用一宽带半导体激光器驱动一损耗中心波长为λＬＰ＝１５５０ｎｍ的长周期光栅和两个反射中心波长分别为λＢ１＝１５４０ｎｍ和λＢ２＝１５６０ｎｍ的光纤布拉格光栅。信息处理部分采用光纤平面法—珀滤波器进行波长扫描测量。获得应力和温度的误差分别为±１０μ∈和±１．５℃。
This paper reports the simultaneous on-line detection of downhole stress and temperature with a combination of fiber Bragg grating and long-period grating. In the experiment, a broadband semiconductor laser was used to drive a long-period grating with loss center wavelength λLP = 1550nm and two fiber Bragg gratings with reflection wavelength λB1 = 1540nm and λB2 = 1560nm respectively. Part of the information processing using optical fiber planar method - Perot filter for wavelength scanning measurements. The errors in stress and temperature were ± 10με and ± 1.5 ° C, respectively.