公开(公告)号：US5608525A

公开(公告)日：1997-03-04

申请号：US404817

申请日：1995-03-14

申请人： Tatsuya Kumagai ,  Keiji Abe ,  Munehiro Akiyama ,  Hiroshi Kajioka ,  Hisao Sonobe ,  Shigeru Oho

发明人： Tatsuya Kumagai ,  Keiji Abe ,  Munehiro Akiyama ,  Hiroshi Kajioka ,  Hisao Sonobe ,  Shigeru Oho

IPC分类号： G01C19/72

CPC分类号： G01C19/72

摘要： A photodetector generates an electric signal by receiving a light signal which is obtained by coupling lights having propagated through an optical fiber sensing loop in clock-wise and counter clock-wise directions, and modulated in a phase modulator. The electric signal is detected in a synchronous detection circuit to generate a fundamental wave component of the phase modulation signal, a duplicate harmonic wave component, a quadruple harmonic wave component, and an orthogonal component which is obtained in accordance with a phase shift of the quadruple harmonic wave component by one quarter period.

摘要翻译： 光电检测器通过接收光信号来产生电信号，所述光信号是通过将在光纤传感环路中传播的光沿时钟方向和逆时针方向耦合而获得的，并在相位调制器中进行调制。 在同步检测电路中检测出电信号，生成相位调制信号的基波分量，重复谐波分量，四次谐波分量，以及根据四极的相移得到的正交分量 谐波分量四分之一。

公开(公告)号：US5701177A

公开(公告)日：1997-12-23

申请号：US795293

申请日：1997-02-04

申请人： Tatsuya Kumagai ,  Hiroshi Kajioka ,  Osamu Kobayashi ,  Munehiro Akiyama ,  Shigeru Oho ,  Hisao Sonobe

发明人： Tatsuya Kumagai ,  Hiroshi Kajioka ,  Osamu Kobayashi ,  Munehiro Akiyama ,  Shigeru Oho ,  Hisao Sonobe

IPC分类号： G01C25/00 ,  G01C19/72 ,  G01C19/64

CPC分类号： G01C19/721

摘要： A phase modulated light is propagated through an optical fiber sensing loop, from which a propagated light is obtained. The propagated light is converted to an electric signal, from which a fundamental wave component and even number harmonic wave components of a phase modulating signal for the phase modulated signal are detected. In accordance with the changes of the fundamental and even number harmonic wave components, fault is detected. On the other hand, the electric signal may be integrated to provide an integrated signal. In accordance with the comparison between the integrated signal and a fault reference voltage, the fault may be detected.

摘要翻译： 相位调制光通过光纤感测环路传播，从中获得传播的光。 传播的光被转换成电信号，从中检测相位调制信号的相位调制信号的基波分量和偶次谐波分量。 根据基波和偶次谐波成分的变化，检测到故障。 另一方面，电信号可以被集成以提供积分信号。 根据集成信号与故障参考电压的比较，可以检测到故障。

公开(公告)号：US5555235A

公开(公告)日：1996-09-10

申请号：US305490

申请日：1994-09-13

申请人： Tatsuya Kumagai ,  Hiroshi Kajioka ,  Munehiro Akiyama ,  Shigeru Oho ,  Hisao Sonobe

发明人： Tatsuya Kumagai ,  Hiroshi Kajioka ,  Munehiro Akiyama ,  Shigeru Oho ,  Hisao Sonobe

IPC分类号： G01C19/72

CPC分类号： G01C19/721

摘要： A signal processing circuit of an optical fiber gyro comprises a memory for storing data measured in the signal processing circuit in accordance with angular velocities applied to an optical fiber sensing loop at preparatory stage, and the applied angular velocities. In operation, the memory is accessed in accordance with data obtained in the signal processing circuit at an operation stage, so that an angular velocity is read from the memory without complicated calculation.

摘要翻译： 光纤陀螺仪的信号处理电路包括存储器，用于根据在准备阶段施加到光纤感测回路的角速度和所施加的角速度来存储在信号处理电路中测量的数据。 在操作中，根据在操作阶段在信号处理电路中获得的数据访问存储器，从而在没有复杂计算的情况下从存储器读取角速度。

公开(公告)号：US5264914A

公开(公告)日：1993-11-23

申请号：US11833

申请日：1993-02-01

申请人： Shigeru Oho ,  Hisao Sonobe ,  Junichi Makino ,  Hiroshi Kajioka ,  Tatsuya Kumagai

发明人： Shigeru Oho ,  Hisao Sonobe ,  Junichi Makino ,  Hiroshi Kajioka ,  Tatsuya Kumagai

IPC分类号： G01C19/72

CPC分类号： G01C19/72

摘要： An interference sensor passes radiation from a source and a polariser to a loop of optical fiber so that radiation beams circulate in opposite directions around the loop and interfere. The loop contains an optical phase modulator which imposes an optical modulator on the radiation beams circulating on the loop. A converter detects the interfering and modulated beams and generates an interference signal which is then processed by an analyser. The interference in the loop is dependent on rotation of the loop and therefore analysis of the interference signal permits that rotation to be measured. In the present invention, the interference signal is (i) sampled at a frequency different from that of the optical modulation, or (ii) electronically modulated in the analyser at a frequency different from that of the optical modulation, or (iii) optically modulated in the loop at a second optical modulation frequency. The analysis in the analyser may be in the frequency domain (i.e. consideration being given to the frequency of the interference signal) or in the time domain (i.e. independent of frequency).

摘要翻译： 干扰传感器将来自源极和偏振器的辐射传递到光纤环，使得辐射束在环绕环路的相反方向上循环并且干涉。 该环路包含光学相位调制器，该光相位调制器在循环中的辐射束上施加光学调制器。 A转换器检测干扰和调制的波束并产生干扰信号，然后由分析仪进行处理。 环路中的干扰取决于环路的旋转，因此干扰信号的分析允许测量旋转。 在本发明中，干扰信号是（i）以与光调制不同的频率进行采样，或者（ii）在分析仪中以与光调制不同的频率进行电子调制，或（iii）光调制 在第二光调制频率的环路中。 分析仪中的分析可能处于频域（即考虑到干扰信号的频率）或时域（即独立于频率）。

公开(公告)号：US5208652A

公开(公告)日：1993-05-04

申请号：US691977

申请日：1991-04-26

申请人： Hisao Sonobe ,  Shigeru Oho ,  Junichi Makino ,  Yasuhiro Gunji ,  Hiroshi Kajioka ,  Tatsuya Kumagai

发明人： Hisao Sonobe ,  Shigeru Oho ,  Junichi Makino ,  Yasuhiro Gunji ,  Hiroshi Kajioka ,  Tatsuya Kumagai

IPC分类号： G01C19/72

CPC分类号： G01C19/72

摘要： In an optical fiber gyroscope, the sensitivity thereof is optimized with a phase bias afforded by utilizing the phase characteristics of an optical branching/coupling unit. Further, the fluctuation of the intensity of a light source and the error and secular change of the phase characteristics of the optical branching/coupling unit are compensated by an electronic circuit. Moreover, an optical fiber loop is located in a heat insulation casing so as not to be affected by an ambient temperature change, thereby to prevent the drift of the optical fiber gyroscope attributed to an temperature change. Thus, the optical fiber gyroscope of high measurement accuracy is provided.

公开(公告)号：US5396327A

公开(公告)日：1995-03-07

申请号：US982206

申请日：1992-11-25

申请人： Tatsuya Kumagai ,  Hiroshi Kajioka ,  Hisao Sonobe

发明人： Tatsuya Kumagai ,  Hiroshi Kajioka ,  Hisao Sonobe

IPC分类号： G01C19/72

CPC分类号： G01C19/721

摘要： The light emitted from a laser diode is divided into two lights and the divided lights are introduced into a sensing loop such that the lights propagate through the sensing loop clockwise and counterclockwise. These lights are combined by a light receiving device and then a signal processing circuit calculates an angular velocity .OMEGA.'. The temperature near the laser diode is detected to obtain a correction value Kt, a current supplied to the laser diode is detected to obtain a correction value Ki and a corrected angular velocity .OMEGA. is obtained by calculating the product of the angular velocity with the correction values Ki and Kt, i.e., .OMEGA.=.OMEGA.'*Ki*Kt.

摘要翻译： 从激光二极管发射的光被分成两个光，并且将分光引入到感测环中，使得光顺时针和逆时针传播通过感测环。 这些灯由光接收装置组合，然后信号处理电路计算角速度OMEGA'。 检测激光二极管附近的温度以获得校正值Kt，检测提供给激光二极管的电流以获得校正值Ki，并通过计算角速度与校正值的乘积来获得校正角速度OMEGA Ki和Kt，即OMEGA = OMEGA'* Ki * Kt。

公开(公告)号：US4818047A

公开(公告)日：1989-04-04

申请号：US91632

申请日：1987-09-01

申请人： Yuuetsu Takuma ,  Hiroshi Kajioka ,  Tatsuya Kumagai ,  Toshihide Tokunaga ,  Kohdo Yamada

发明人： Yuuetsu Takuma ,  Hiroshi Kajioka ,  Tatsuya Kumagai ,  Toshihide Tokunaga ,  Kohdo Yamada

IPC分类号： G02B6/024 ,  G02B6/10 ,  G02B6/22

CPC分类号： G02B6/105

摘要： A polarized wave preserving fiber has a core at its center, cladding, an oval jacket, and a support member in order to improve transmitting property of the polarized single mode by adjusting the refractive index distribution and the ellipticity of the oval jacket.

摘要翻译： 偏振波保留光纤在其中心具有芯，包层，椭圆形护套和支撑构件，以便通过调节椭圆形护套的折射率分布和椭圆率来改善偏振单模的透射特性。

公开(公告)号：US5471301A

公开(公告)日：1995-11-28

申请号：US223711

申请日：1994-04-05

申请人： Tatsuya Kumagai ,  Hisao Iitsuka ,  Hiroshi Kajioka ,  Wataru Ohnuki ,  Toshiyuki Tetsu

发明人： Tatsuya Kumagai ,  Hisao Iitsuka ,  Hiroshi Kajioka ,  Wataru Ohnuki ,  Toshiyuki Tetsu

IPC分类号： G01C19/72 ,  G01C19/64

CPC分类号： G01C19/721

摘要： In an optical fiber gyro for detecting a rotation angular velocity by Sagnac phase difference of light signals propagated through an optical fiber sensing loop, no polarizer is used, and a light source having a difference in attenuation or amplification factor between two orthogonally polarized lights is used. Alternatively, a light source is optically coupled to an optical coupler for supplying two divided light signals to the sensing loop and receiving the two light signals propagated through sensing loop by an optical fiber of a predetermined length which is set to meet a relation in which a distance difference determined by the predetermined length and a phase difference of two orthogonally polarized lights propagated through the optical fiber is greater than an interference distance of the light source.

摘要翻译： 在用于通过光纤传感回路传播的光信号的Sagnac相位差检测旋转角速度的光纤陀螺仪中，不使用偏振器，并且使用具有两个正交偏振光之间的衰减或放大系数差的光源 。 或者，光源光学耦合到光耦合器，用于向感测环路提供两个分开的光信号，并且通过预定长度的光纤接收通过感测环路传播的两个光信号，该光纤设置为满足以下关系： 通过预定长度确定的距离差和通过光纤传播的两个正交偏振光的相位差大于光源的干涉距离。

公开(公告)号：US08922760B2

公开(公告)日：2014-12-30

申请号：US13698988

申请日：2011-05-18

申请人： Hiroshi Kajioka

发明人： Hiroshi Kajioka

IPC分类号： G01N33/48 ,  G01N21/55 ,  A61B5/1455 ,  G01N21/59 ,  G01N21/21 ,  A61B5/145

CPC分类号： G01N21/55 ,  A61B5/14532 ,  A61B5/1455 ,  A61B5/14558 ,  G01N21/21 ,  G01N21/59 ,  G01N2201/08

摘要： There is provided an optical rotation measurement apparatus and a measuring system which are user-friendly, capable of measuring glucose concentration in drawn blood and living bodies with high accuracy in real time such that it is available for use at an actual medical site without depending on a reagent, and capable of measuring glucose concentration in a living body noninvasively with high accuracy, a new polarized light converting optical system that can be used for the measuring system, and an optical rotation measurement method using the optical system.The problems are resolved by inserting a non-reciprocal optical system sandwiching a specimen in an optical fiber ring interferometer, using input/output optical fibers of the non-reciprocal optical system, which are comprised of a large core diameter low NA single mode optical fiber, as an input/output part, connected via a mode-matching unit to a small core diameter and high NA polarization preserving fiber as a transmission part, and employing a defocused configuration without deploying the optical fiber ends at focal points of lenses.

摘要翻译： 提供了一种用户友好的光学旋转测量装置和测量系统，能够实时高精度地测量抽取的血液和活体中的葡萄糖浓度，使其可以在实际的医疗场所使用而不依赖于 能够高精度地测量生物体中的葡萄糖浓度的试剂，能够用于测定系统的新的偏振光转换光学系统和使用该光学系统的光学旋转测定方法。 通过将不可逆的光学系统插入到光纤环形干涉仪中，使用不可逆光学系统的输入/输出光纤将大型芯径的低NA单模光纤 作为输入/输出部分，通过模式匹配单元连接到小芯直径和高NA偏振保留光纤作为透射部分，并且采用散焦构造而不将光纤端部部署在透镜的焦点处。

公开(公告)号：US4859223A

公开(公告)日：1989-08-22

申请号：US141364

申请日：1988-01-05

申请人： Hiroshi Kajioka ,  Koudo Yamada ,  Yuuetsu Takuma ,  Tatsuo Teraoka

发明人： Hiroshi Kajioka ,  Koudo Yamada ,  Yuuetsu Takuma ,  Tatsuo Teraoka

IPC分类号： C03B37/014

CPC分类号： C03B37/01466 ,  C03B37/01493 ,  C03B2203/22 ,  C03B2203/30

摘要： Two opposite portions of the surface of a core rod whose section is circular are removed by machining in the longitudinal direction thereof, so that the section of the core rod is transformed into a non-circular shape. On the surface of the thusly shaped non-circular core rod, glass particulates are accumulated, and then the glass particulates accumulated on the core rod are sintered to create a preform. Then, the preform is heated and drawn, so that a polarization-maintaining optical fiber of non-circular section is obtained.

摘要翻译： 通过在其纵向方向上的机械加工来除去截面为圆形的芯棒的表面的两个相对部分，使得芯棒的截面变成非圆形。 在如此形成的非圆形芯棒的表面上，玻璃颗粒被堆积，然后将堆积在芯棒上的玻璃微粒烧结以形成预制件。 然后，对预成型体进行加热拉拔，得到非圆形截面的偏振保持光纤。