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    Laser doppler velocimeter
    5.
    发明授权
    Laser doppler velocimeter 失效
    激光多普勒测速仪

    公开(公告)号：US5587785A

    公开(公告)日：1996-12-24

    申请号：US407671

    申请日：1995-03-21

    申请人： Satoru Kato ,  Hiroshi Ito ,  Tadashi Ichikawa ,  Manabu Kagami

    发明人： Satoru Kato ,  Hiroshi Ito ,  Tadashi Ichikawa ,  Manabu Kagami

    IPC分类号： G01P5/00 ,  G01F1/66 ,  G01P3/36 ,  G01P5/26 ,  G01S17/58 ,  G01S17/95 ,  G01D3/36

    CPC分类号： G01P5/26 ,  G01P3/366 ,  G01S17/95

    摘要： A laser Doppler velocimeter in which laser light whose frequency changes continuously at least for a fixed time duration is branched into at least two beams, and the at least two branched beams are respectively transmitted by at least one pair of optical fibers having an optical path difference therebetween, and are focused onto a region to be measured by at least one focusing device. The scattered light of the laser beams focused in the region to be measured are received by a light-receiving device via at least one incident device. At least one Doppler shift frequency in the region to be measured is calculated on the basis of the frequency of a signal of the scattered light received by the light-receiving device, the optical path difference, and a rate of change of the frequency of the laser light. The flow velocity and the direction of the flow velocity are calculated from the calculated Doppler shift frequency.

    摘要翻译： 一种激光多普勒测速仪，其中频率连续至少持续固定持续时间的激光被分支成至少两个光束，并且所述至少两个分支光束分别由具有光程差的至少一对光纤传输 并且通过至少一个聚焦装置聚焦到待测量的区域上。 聚焦在待测区域中的激光束的散射光经由至少一个入射装置由光接收装置接收。 基于由受光装置接收的散射光的信号的频率，光程差以及频率的变化率来计算待测区域中的至少一个多普勒频移 激光灯。 从计算出的多普勒频移计算流速和流速方向。

    Fiberoptic apparatus for measuring electromagnetic field intensity with an electro-optic sensor
    6.
    发明授权
    Fiberoptic apparatus for measuring electromagnetic field intensity with an electro-optic sensor 失效
    光电传感器测量电磁场强度的光纤设备

    公开(公告)号：US5278499A

    公开(公告)日：1994-01-11

    申请号：US787791

    申请日：1991-11-04

    申请人： Hiroshi Ito ,  Tadashi Ichikawa ,  Satoru Kato

    发明人： Hiroshi Ito ,  Tadashi Ichikawa ,  Satoru Kato

    IPC分类号： G01R15/24 ,  G01R29/08 ,  G01R33/032 ,  G02B6/34 ,  G01R33/02 ,  G01D5/34 ,  G02B5/14 ,  H01J5/16

    CPC分类号： G01R33/032 ,  G01R29/0885

    摘要： An electromagnetic field intensity measuring apparatus comprises a sensor located in the electromagnetic field measuring place for receiving the measuring light from the optical fiber, the sensor being adapted to modulate the measuring light entering the sensor depending on the intensity of the electromagnetic field, the modulated light being then re-applied to the optical fiber; a polarization rotating device located between the measuring light generating device and the optical fiber, the polarization rotation device being operative to cause the polarized wavefront of the measuring light passed therethrough to rotate a given angle in the direction of passage; and a polarization beam splitter disposed between the measuring light generating device and the polarization rotating device, the polarization beam splitter being operative to permit only the measuring light from said measuring light generating device to pass through said polarization beam splitter and also to reflect the modulated measuring light inputted through the polarization rotating device in a predetermined direction. The electromagnetic field intensity in the measuring place can be calculated, based on the amplitude of the measuring light reflected by the polarization beam splitter.

    摘要翻译： 电磁场强度测量装置包括位于电磁场测量位置的传感器，用于接收来自光纤的测量光，该传感器适于根据电磁场的强度调制进入传感器的测量光，调制光 然后再次应用于光纤; 位于所述测量光产生装置和所述光纤之间的偏振旋转装置，所述偏振旋转装置可操作以使通过的测量光的偏振波前沿通过方向旋转给定的角度; 以及设置在所述测量光产生装置和所述偏振旋转装置之间的偏振分束器，所述偏振分束器用于仅允许来自所述测量光产生装置的测量光通过所述偏振分束器并且还将所述调制测量 通过偏振旋转装置沿预定方向输入的光。 可以根据由偏振分束器反射的测量光的振幅来计算测量场所的电磁场强度。

    Method of forming groove by laser
    7.
    发明授权
    Method of forming groove by laser 失效
    通过激光形成凹槽的方法

    公开(公告)号：US06268585B1

    公开(公告)日：2001-07-31

    申请号：US09143087

    申请日：1998-08-28

    申请人： Tadashi Ichikawa ,  Hiroshi Ito

    发明人： Tadashi Ichikawa ,  Hiroshi Ito

    IPC分类号： B23K2638

    CPC分类号： B23K26/066 ,  B23K26/073 ,  B23K26/361 ,  B23K26/364

    摘要： A method of forming a groove having a desired cross section easily and rapidly, by making laser beam scan in the longitudinal direction of the groove. In the method, a laser beam 11 is irradiated to a work 15 to form a groove 16. When the longitudinal and the width direction of the groove is the x-axis and the y-axis, respectively, an intensity distribution of the laser beam in an irradiated region Q on the work is expressed by f(x, y). An integral of f(x, y) with respect to x, i.e., g(y), is proportional to a depth distribution of the groove 16, d(y), and the intensity distribution f(x, y) is formed by passing the laser beam 11 through a mask pattern 12a which has an appropriate transmission factor distribution. The groove 16 is formed by moving the region Q in the x-axis direction. The cross section of the groove 16 is determined by the mask pattern 12a. And the groove 16, having a desired cross section, is obtained in one scanning in the x-axis direction.

    摘要翻译： 通过沿槽的纵向进行激光扫描，容易且快速地形成具有所需横截面的槽的方法。 在该方法中，激光束11照射到工件15上以形成凹槽16.当凹槽的纵向和宽度方向分别为x轴和y轴时，激光束的强度分布 在照射区域Q上的工作由f（x，y）表示。 f（x，y）相对于x的积分，即g（y）与凹槽16的深度分布d（y）成比例，并且强度分布f（x，y）由 使激光束11通过具有适当的透射因子分布的掩模图案12a。 通过沿X轴方向移动区域Q形成槽16。 凹槽16的横截面由掩模图案12a确定。 并且具有期望的横截面的凹槽16在x轴方向上进行一次扫描。

    Optical integrated voltage sensor for optically measuring the magnitude of a voltage
    8.
    发明授权
    Optical integrated voltage sensor for optically measuring the magnitude of a voltage 失效
    用于光学测量电压大小的光学集成电压传感器

    公开(公告)号：US5969341A

    公开(公告)日：1999-10-19

    申请号：US949006

    申请日：1997-10-10

    申请人： Hiroshi Ito ,  Tadashi Ichikawa ,  Satoru Kato

    发明人： Hiroshi Ito ,  Tadashi Ichikawa ,  Satoru Kato

    IPC分类号： G01R29/08 ,  G01R1/07 ,  G01R13/34 ,  G02B5/14

    CPC分类号： G01R1/071 ,  G01R13/347

    摘要： A compact voltage sensor with stable characteristics is provided. A measuring beam that is incident from an optical fiber is branched into first and second modulation-inducing waveguides of a wave branching/combining section within an optical integrated circuit. Phase changes of opposite sign are induced in the measuring beams propagating within the first and second modulation waveguides by applying voltages of mutually opposite sign to modulation-inducing electrodes, to induce a phase difference between the two. By reflecting the measuring beams from a reflective surface, propagating them back in the opposite direction within the first and second modulation waveguides, and passing them through the optical intensity modulation section again, thus applying a further phase modulation thereto, the phase difference between the measuring beams proceeding in the opposite direction within the first and second modulation waveguides can be made to be substantially twice the phase difference of the measuring beams before they are reflected by the reflective surface. The sensor also has a function to protect a sensor section thereof from dielectric breakdown caused by the accidental input of a high voltage.

    摘要翻译： 提供具有稳定特性的紧凑型电压传感器。 从光纤入射的测量光束被分支到光集成电路内的波分支/合成部分的第一和第二调制诱导波导。 通过向调制诱导电极施加相互相反的电压的电压，在第一和第二调制波导中传播的测量光束中引起相反符号的相位变化，以引起两者之间的相位差。 通过从反射表面反射测量光束，在第一和第二调制波导内沿相反方向传播它们，并再次通过光强度调制部分，从而对其进行相位调制，测量之间的相位差 在第一调制波导和第二调制波导之间沿相反方向前进的光束在被反射表面反射之前可以大致是测量光束的相位差的两倍。 传感器还具有保护其传感器部分免受高电压意外输入引起的电介质击穿的功能。

    Optical-optical modulators
    9.
    发明授权
    Optical-optical modulators 失效
    光学调制器

    公开(公告)号：US5627920A

    公开(公告)日：1997-05-06

    申请号：US446308

    申请日：1995-05-22

    申请人： Naohiko Kato ,  Tadashi Ichikawa ,  Hiroshi Ito ,  Tomoyoshi Motohiro ,  Tatsumi Hioki

    发明人： Naohiko Kato ,  Tadashi Ichikawa ,  Hiroshi Ito ,  Tomoyoshi Motohiro ,  Tatsumi Hioki

    IPC分类号： G02F1/035 ,  G02B6/12 ,  G02F1/01 ,  G02F1/225 ,  G02F7/00 ,  G02B6/10

    CPC分类号： G02F1/0126 ,  G02F1/225 ,  G02B2006/12142

    摘要： An optical-optical modulator (10) has a substrate (1) made of Zcut-LiNbO.sub.3 and a Ti-diffused waveguide (2) thereon. The waveguide (2) is separated into two branches which merge later into one again and constitute the Mach-Zehnder interferometer. A pair of electrodes (3a, 3b) for phase modulation is formed on a modulation part (A) which is in the middle of the waveguide (2). A CdS.sub.x Te.sub.1-x photoelectric conversion film (6) is formed directly contacting the pair of electrodes (3a, 3b). The photoelectric film (6) is manufactured by oblique vapor deposition utilizing CdS and CdTe as two vapor deposition sources. When the photoelectric conversion film 6 receives a control light (Lc), the film (6) generates voltage. The generated voltage is applied to the pair of electrodes (3a, 3b) and becomes a modulation signal of the carrier light (La).

    摘要翻译： 光学调制器（10）具有由Zcut-LiNbO 3构成的基板（1）和Ti扩散波导（2）。 波导（2）被分成两个分支，后来再合并成一个分支，构成马赫 - 曾德尔干涉仪。 在波导（2）的中间的调制部（A）上形成有用于相位调制的一对电极（3a，3b）。 直接与一对电极（3a，3b）接触的CdSxTe1-x光电转换膜（6）。 光电膜（6）通过使用CdS和CdTe作为两个气相沉积源的倾斜气相沉积来制造。 当光电转换膜6接收到控制光（Lc）时，膜（6）产生电压。 所产生的电压被施加到一对电极（3a，3b），并成为载体光（La）的调制信号。

    Stabilizing device for optical modulator
    10.
    发明授权
    Stabilizing device for optical modulator 失效
    光调制器稳定装置

    公开(公告)号：US5907426A

    公开(公告)日：1999-05-25

    申请号：US884661

    申请日：1997-06-27

    申请人： Naohiko Kato ,  Hiroshi Ito ,  Tadashi Ichikawa ,  Tomoyoshi Motohiro ,  Tatsumi Hioki

    发明人： Naohiko Kato ,  Hiroshi Ito ,  Tadashi Ichikawa ,  Tomoyoshi Motohiro ,  Tatsumi Hioki

    IPC分类号： G01D3/028 ,  G01R15/24 ,  G01R29/08 ,  G02F1/01 ,  H04B10/145 ,  G02F1/035 ,  G02F1/055

    CPC分类号： G02F1/0123 ,  G01D3/028 ,  G01R29/0885 ,  G01R15/241

    摘要： A device for stabilizing a modulation operation of an optical modulator is provided, the optical modulator having an optical waveguide provided on a substrate and an electrode provided so as to correspond to the optical waveguide, modulating light inputted to the optical waveguide by a voltage corresponding to a physical amount to be measured which is inputted to the electrode, and outputting the modulated light. The device includes: an optical detecting device for outputting signal corresponding to intensity of light outputted from the optical modulator; a control signal outputting device for, on the basis of the output signal of the optical detecting device, outputting a control signal which compensates a phase bias fluctuation of the optical modulator; a light source device for outputting control light corresponding to the control signal; and a voltage applying device, provided in contact with the electrode of the optical modulator, for applying voltage corresponding to the control light to the electrode. Accordingly, the light source device illuminates to the voltage applying device a control light corresponding to a driving signal which negatively feeds back a phase bias fluctuation signal. In this way, the voltage applying device applies a voltage which is set so as to offset variation in phase bias fluctuation in accordance with bias fluctuation, and the phase bias fluctuation is offset.

    摘要翻译： 提供一种用于稳定光调制器的调制操作的装置，所述光调制器具有设置在基板上的光波导和设置成对应于光波导的电极，将输入到光波导的光调制为对应于 输入到电极的要测量的物理量，并输出调制光。 该装置包括：光检测装置，用于输出对应于从光调制器输出的光强度的信号; 控制信号输出装置，用于根据光学检测装置的输出信号输出补偿光调制器的相位偏差波动的控制信号; 光源装置，用于输出对应于控制信号的控制光; 以及电压施加装置，与光调制器的电极接触，用于将对应于控制光的电压施加到电极。 因此，光源装置向电压施加装置照射与驱动信号对应的控制光，负极反馈相位偏差波动信号。 以这种方式，电压施加装置施加电压，该电压被设定为根据偏置波动来偏移相位偏差波动的变化，并且相位偏差波动被偏移。