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公开(公告)号：US5381229A
公开(公告)日：1995-01-10
申请号：US937651
申请日：1992-08-31
申请人： Kent Murphy , Ashish Vengsarkar , Shari Feth , Richard Claus , Sridhar Gollapudi , Anbo Wang
发明人： Kent Murphy , Ashish Vengsarkar , Shari Feth , Richard Claus , Sridhar Gollapudi , Anbo Wang
CPC分类号： G01D5/268 , G01K11/3206
摘要： An optical interferometer comprises a multi-mode sapphire fiber as a high temperature sensor. One end of the sapphire fiber is coupled to a silica fiber and, in turn, to the sapphire fiber. The sapphire fiber sensor produces reference and sensor reflections that produce optical fringes at the output of a detector coupled to the silica optical fiber via an opto-coupler. The optical fringes are related to displacements of the sensor which, in turn, can provide an indirect measurement of pressure, strain or temperature of the surface.
摘要翻译： 光干涉仪包括作为高温传感器的多模式蓝宝石光纤。 蓝宝石纤维的一端与二氧化硅纤维相连，而与蓝宝石纤维相连。 蓝宝石光纤传感器产生参考和传感器反射，其通过光耦合器在耦合到二氧化硅光纤的检测器的输出处产生光边。 光学条纹与传感器的位移相关，传感器的位移又可以提供对表面的压力，应变或温度的间接测量。
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公开(公告)号：US5208877A
公开(公告)日：1993-05-04
申请号：US751737
申请日：1991-08-29
CPC分类号： G02B6/02047 , G01D5/3538 , G02B6/02123 , G02B6/14
摘要： Two-mode, elliptical-core optic fibers with a permanent photo-induced index change are used as sensors with sensitivity varying as a function of length. The optic fiber sensors act as vibrational-mode filters thereby performing initial signal processing of the sensor signal. The sensors are based on photo-induced refractive index changes. These refractive index changes affect the differential phase modulation between the LP.sub.01 and the LP.sub.11.sup.even modes. The change in beat-length is dependent on the amount of strain induced in the fiber while the grating is being formed. The pattern is thus varied along the length of the fiber by straining the fiber in a specific fashion while the grating is being written. This changes the sensitivity, of the sensor along its length. By choosing an appropriate weighting function in the manufacture of the sensor, it is possible to implement vibrational-mode analysis, vibrational-mode filtering and other functions that are critical in control system applications.
摘要翻译： 使用具有永久光诱导指数变化的双模，椭圆芯光纤作为传感器，灵敏度随长度的变化而变化。 光纤传感器用作振动模式滤波器，从而执行传感器信号的初始信号处理。 传感器基于光诱导的折射率变化。 这些折射率变化影响LP01和LP11模式之间的差分相位调制。 拍子长度的变化取决于在形成光栅时光纤中诱发的应变量。 因此，通过在光栅被写入时以特定的方式使光纤变窄，沿着光纤的长度变化图案。 这会改变传感器沿其长度的灵敏度。 通过在传感器的制造中选择适当的加权函数，可以实现在控制系统应用中至关重要的振动模式分析，振动模式滤波和其他功能。
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