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10 条记录 (耗时 0.038 秒)

    Longitudinal mode fiber acoustic waveguide with solid core and solid cladding
    8.
    发明授权
    Longitudinal mode fiber acoustic waveguide with solid core and solid cladding 失效
    具有实芯和固体包层的纵向模式纤维声波导

    公开(公告)号：US4743870A

    公开(公告)日：1988-05-10

    申请号：US910539

    申请日：1986-09-23

    申请人： Cheng K. Jen ,  Ahmad Safaai-Jazi ,  Jean F. Bussiere ,  Gerald W. Farnell

    发明人： Cheng K. Jen ,  Ahmad Safaai-Jazi ,  Jean F. Bussiere ,  Gerald W. Farnell

    IPC分类号： G10K11/24 ,  H03H9/02 ,  H03H9/13 ,  H03H9/30

    CPC分类号： H03H9/30 ,  G10K11/24

    摘要： An elastic waveguide, for propagating acoustic waves, consists of an elongated solid core region and an elongated solid outer cladding region. The acoustic waves propagate in a mode where the principle particle displacement is substantially parallel to the longitudinal axis of the waveguide, this mode is called longitudinal mode. The material densities and the bulk shear wave velocities of the core and cladding region are substantially the same but the bulk longitudinal wave velocity of the cladding region is larger than that of the core region.

    摘要翻译： 用于传播声波的弹性波导由细长的实心芯区域和细长的实心外包层区域组成。 声波以原理粒子位移基本上平行于波导的纵向轴线的方式传播，该模式被称为纵向模式。 芯和包层区域的材料密度和体积剪切波速度基本相同，但是包层区域的体积纵波速度大于核心区域的体积纵波速度。

    Narrowband fiberoptic spectral filter formed from fibers having a refractive index with a W profile and a step profile
    9.
    发明授权
    Narrowband fiberoptic spectral filter formed from fibers having a refractive index with a W profile and a step profile 失效
    窄带光纤光谱滤波器由具有W分布和阶梯轮廓的折射率的纤维形成

    公开(公告)号：US4976512A

    公开(公告)日：1990-12-11

    申请号：US333572

    申请日：1989-04-05

    申请人： Ahmad Safaai-Jazi

    发明人： Ahmad Safaai-Jazi

    IPC分类号： G02B6/036 ,  G02B6/34

    CPC分类号： G02B6/03627 ,  G02B6/29332

    摘要： A narrowband optical fiber spectral filter comprises a fiber optic coupler formed from a W fiber and step index fiber. The W index fiber comprises a core having a high index of refraction. The core is surrounded by an inner cladding that has a very low index of refraction. An outer cladding surrounds the inner cladding and has an index of refraction that is greater than that of the inner cladding but less than that the core. The core of the step index fiber is surrounded by an outer cladding that preferably has the same index of refraction as the outer cladding of the first fiber. The two fibers are fused together to form a fiberoptic coupler that has an interaction region of predetermined length. The resulting fiberoptic coupler has different transmission characteristics for the two component fibers at which light can transfer between the fibers. The dispersion characteristics are the same for only a very narrow range of wavelengths. The resulting spectral filter thus has a narrower bandwidth than obtained by modifying other parameters of a fiberoptic spectral filter.

    摘要翻译： 窄带光纤光谱滤波器包括由W光纤和阶跃折射率光纤形成的光纤耦合器。 W折射率纤维包括具有高折射率的纤芯。 该芯由被折射率非常低的内包层包围。 外包层围绕内包层并且具有大于内包层的折射率但小于芯的折射率。 阶跃折射率纤维的纤芯由外包层围绕，外包层优选地具有与第一纤维的外包层相同的折射率。 将两根纤维熔合在一起形成具有预定长度的相互作用区域的光纤耦合器。 所得到的光纤耦合器对于光可以在光纤之间传输的双组分纤维具有不同的透射特性。 只有非常窄的波长范围，色散特性是相同的。 所得到的光谱滤波器因此具有比通过修改光纤光谱滤波器的其它参数获得的带宽更窄的带宽。

    Birefringent single-mode acoustic fiber
    10.
    发明授权
    Birefringent single-mode acoustic fiber 失效
    双折射单模声波光纤

    公开(公告)号：US4742318A

    公开(公告)日：1988-05-03

    申请号：US27874

    申请日：1987-03-19

    申请人： Cheng-Kuei Jen ,  Gerald W. Farnell ,  Ahmad Safaai-Jazi

    发明人： Cheng-Kuei Jen ,  Gerald W. Farnell ,  Ahmad Safaai-Jazi

    IPC分类号： G01D5/48 ,  G10K11/24 ,  H03H9/30

    CPC分类号： G01D5/48 ,  G10K11/24

    摘要： A birefringent single-mode acoustic fiber for propagating linearly polarized shear acoustic waves while preserving linear polarization, comprises an elongated core region of a solid material in which acoustic waves can be propagated in two orthogonal shear mode components, and a cladding region enclosing all surfaces of the core region except end surfaces thereof, the cladding region being also of a solid material in which acoustic waves can be propagated in two orthogonal shear mode components. The core and cladding regions have different shear wave velocities with the shear wave velocity of the core region being lower than that of the cladding region, the core or cladding region being characterized by at least one birefringence causing factor selected from the group consisting of (a) noncircular geometry of the core region, (b) asymmetry of shear wave velocity distribution in the core region and (c) asymmetrical stress induced in the cladding region, whereby to strongly break degeneracy between the two orthogonal shear mode components and preserve linear polarization thereof throughout the fiber. The birefringent single-mode acoustic fiber according to the invention is particularly useful in acoustic fiber sensor systems for monitoring environmental changes in pressure, temperature, strain, stress, etc.

    摘要翻译： 用于传播线性偏振剪切声波同时保持线性偏振的双折射单模声波光纤包括固体材料的细长芯区域，其中声波可以在两个正交剪切模式分量中传播，包围区域包围所有表面的 核心区域除了其端面之外，包层区域也是固体材料，其中声波可以在两个正交剪切模式分量中传播。 核心区域和包层区域具有不同的剪切波速度，其中核心区域的剪切波速度低于包层区域的剪切波速度，芯部或包层区域的特征在于至少一个双折射引起因子，其选自（a ）核心区域的非圆形几何形状，（b）芯区域中剪切波速度分布的不对称性和（c）在包层区域中诱发的不对称应力，从而强烈地破坏两个正交剪切模式分量之间的简并性并保留线性极化 整个纤维。 根据本发明的双折射单模声波光纤在用于监测压力，温度，应变，应力等环境变化的声学光纤传感器系统中特别有用。