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    • 2. 发明授权
    • Polarization plane maintaining optical fiber fabricating method
    • 偏振平面保持光纤制造方法
    • US4828592A
    • 1989-05-09
    • US883456
    • 1986-07-08
    • Hiroyoshi MatsumuraToshio KatsuyamaTsuneo Suganuma
    • Hiroyoshi MatsumuraToshio KatsuyamaTsuneo Suganuma
    • C03B37/018G02B6/10
    • C03B37/01807C03B37/01869G02B6/105C03B2203/10C03B2203/24C03B2203/30
    • An optical fiber having an intense polarization plane maintenability is constructed of an optical waveguide having a circular core and a circular cladding, a jacket formed on the outer circumference of the optical waveguide and having an elliptical outer circumference, and a supporting portion formed on the jacket.In order to fabricate the above-specified optical fiber, a preformed rod therefor is prepared by forming the inner wall of an silica glass tube with the jacket and the optical waveguide made of such materials as satisfy a relationship of c.sub.2 /a.gtoreq.200/(100-.gamma.)-1, wherein: letter .gamma. stands for the ellipticity of the outer circumference of the aforementioned jacket; letter c.sub.2 stands for the minor axis of an ellipse; and letter a stands for the radius of the circular optical waveguide, and by subsequently collapsing the aforementioned silica glass tube while having its internal pressure made lower than the atmospheric pressure by 1 to 20 mmH.sub.2 O.
    • 具有强偏振平面可维护性的光纤由具有圆形芯和圆形包层的光波导构成,形成在光波导的外圆周上并具有椭圆形外周的外套和形成在外壳上的支撑部 。 为了制造上述规定的光纤,通过形成具有护套的石英玻璃管的内壁和由满足关系式c2 / a> / = 200的材料制成的光波导来制备预成型棒 /(100-gamma)-1,其中:字母gamma代表上述外套的外圆周的椭圆率; 字母c2表示椭圆的短轴; 字母a表示圆形光波导的半径,并且随后将其内压低于大气压的上述石英玻璃管塌缩1〜20mmH 2 O。
    • 3. 发明授权
    • Optical gyroscope with large propagation constant difference
    • 具有较大传播常数差的光学陀螺仪
    • US4483617A
    • 1984-11-20
    • US354187
    • 1982-03-03
    • Hiroyoshi MatsumuraToshio KatsuyamaTsuneo Suganuma
    • Hiroyoshi MatsumuraToshio KatsuyamaTsuneo Suganuma
    • G01C19/72G01P3/36G01B9/02G01C19/64
    • G01C19/721
    • In an optical gyroscope comprising a coil of an optical fiber having opposite ends on which linearly polarized input light beams are incident and from which output light beams are derived which create an interference pattern to be detected, the optical fiber has orthogonal principal axes along which the light beams propagate at a large propagation constant difference. The application of the linearly polarized input light beams to the opposite ends of the optical fiber coil is such that the polarization plane of the linearly polarized light beam coincides with the same principal axis on the opposite ends. Thus, polarization characteristics of the output light beam from the optical fiber coil becomes time invariant and the light paths for the two light beams coincide with each other. In particular, in order to minimize the influence of external disturbances, the optical fiber has a structure defined by.vertline.N.sub.x -N.sub.y .vertline.>.lambda./R.sub.owhere N.sub.x and N.sub.y are refractive indices of said optical fiber in directions of the orthogonal principal axes, R.sub.o is the radius of said optical fiber coil, and .lambda. is the wavelength of the light beam.
    • 在包括光纤的线圈的光学陀螺仪中,所述光纤的线圈具有相对的端部,线偏振的输入光束入射,从中导出输出光束,产生要检测的干涉图案,所述光纤具有正交的主轴, 光束以大的传播常数差传播。 将线偏振输入光束施加到光纤线圈的相对端,使得线偏振光束的偏振平面与相对端的相同主轴重合。 因此,来自光纤线圈的输出光束的偏振特性变得不变,并且两个光束的光路彼此一致。 特别地,为了最小化外部干扰的影响,光纤具有由| Nx-Ny>λ/ Ro定义的结构,其中Nx和Ny是所述光纤在正交主轴的方向上的折射率,Ro 是所述光纤线圈的半径,λ是光束的波长。