公开(公告)号：JPH1123223A

公开(公告)日：1999-01-29

申请号：JP15883398

申请日：1998-06-08

Applicant: LITTON SYSTEMS INC

Inventor： HALL DAVID B ,  FERSHT SAMUEL N

IPC: G01P15/03 ,  G01B9/02 ,  G01B11/00 ,  G01H9/00 ,  G01L9/00

Abstract: PROBLEM TO BE SOLVED: To provide a fiber-optic interferometer sensor system in which an ordinary batch-treated silicon sensor can be used when the sensor system is applied to a hydrophone, etc. SOLUTION: Optical signals are split into first and second beams respectively guided to the first and second optical branches 33 and 35 of an interferometer 31. A fixed mirror 41 reflects the first beam received at the end section of the first branch 33. An optical pick-off incorporates a mobile mirror which is positioned to reflect the second beam received from the end section of the second branch 35. The mobile mirror is constituted so that the mirror can be moved in accordance with the value fluctuation of a parameter to be measured. An optical coupler 38 generates an interference signal which is detected by means of a photodetector 39 by synthesizing the first and second beams with each other after the beams respectively return to the branches 33 and 35 after reflection. The photodetector 39 generates an electronic signal having a value indicating the value of the interference signal. The electronic signal is analyzed and the correlation between the value of the electronic signal and the value fluctuation of the environmental parameter to be measured is taken.

公开(公告)号：JPH11142164A

公开(公告)日：1999-05-28

申请号：JP24646798

申请日：1998-07-29

Applicant: LITTON SYSTEMS INC

Inventor： WYSE STANLEY F ,  STEWART ROBERT E ,  FERSHT SAMUEL N

IPC: G01C19/56 ,  G01P9/04

Abstract: PROBLEM TO BE SOLVED: To constitute a rotary sensor nearly as highly accurate as can be a navigation class while reducing the cost sufficiently. SOLUTION: A first driving member 38 is coupled to a hub. A first detecting device 34 having a supporting member is coupled to the driving member so that a rotary vibration of the driving member centering a driving shaft can be transmitted to the supporting member. The first detecting device 34 is coupled to the supporting member, including a detecting element 110 vibrating together with the supporting member about the driving shaft. The detecting element is constituted to vibrate rotatably to the supporting member about a detection shaft perpendicular to the driving shaft in response to an input rotational speed of a frame 50 centering an input shaft perpendicular to the detection shaft and the driving shaft. A second driving member 40 is coupled to the first driving member 38 and set so as to generate a rotary vibration in a direction opposite to the rotary vibration generated by the first driving member. A second detecting device 36 has a second detecting element 112 vibrating about a second detection shaft in parallel to the first detection shaft.

公开(公告)号：JP2000065633A

公开(公告)日：2000-03-03

申请号：JP24781599

申请日：1999-07-30

Applicant: LITTON SYSTEMS INC

Inventor： HALL DAVID B ,  FREDERICK DONALD A ,  FERSHT SAMUEL N

IPC: G01B9/02 ,  G01H9/00 ,  G01V1/16 ,  G01V1/22

Abstract: PROBLEM TO BE SOLVED: To provide an optical waveguide vibration sensor system with improved maximum frequency displacement when configuring frequency modulation. SOLUTION: An optical waveguide pipe 28 formed in an integrated optical substrate 30 is included in the light path of a light interferometer 51, a light signal source 12 is provided so that it gives a light signal to the light interferometer 51, a channel waveguide phase modulator 38 is formed on the substrate 30, the light signal guided by the optical waveguide pipe 28 can be subjected to phase modulation, a signal from a diophone 50 for generating an electrical signal according to mechanical vibration is inputted to the phase modulator 38, the diophone 50 is connected to the channel waveguide phase modulator 38, the phase of the light signal guided by the optical waveguide pipe 28 is modulated by an electrical signal, an interference pattern that is outputted from the light interferometer 51 indicates the amplitude of mechanical vibration, and at least one optical fiber 24 is included in the light interferometer 51 for giving mismatching between the optical path lengths of the interferometer.

公开(公告)号：JPH10206172A

公开(公告)日：1998-08-07

申请号：JP35478697

申请日：1997-12-24

Applicant: LITTON SYSTEMS INC

Inventor： CORDOVA AMADO ,  FERSHT SAMUEL N

IPC: G01C19/72

Abstract: PROBLEM TO BE SOLVED: To minimize a bias error introduced from an environment by receiving an output from an optical energy source as a pair of beams propagated in a relative direction by an embedded coil, and supplying obtained interference pattern as a gyro output to a detector. SOLUTION: Shupe (phonetic) bias error is minimized by replacing part of a sensor coil 18 with a dummy layer. The layer forms part of a wound coil structure, but does not carry or transmit an optical signal responding to rotation. Such a layer contributes to a second element 24 of the coil 18. If the layer has thermomechanical characteristics similar to characteristics of the embedded sensor coil, plotting contributing to Shupe integration is not corrected due to the presence of the layer. A rotation responding element includes a small fiber layer that contribution to the integration at all temperatures. Accordingly, small Shupe bias error is produced by the integration of the responding element.

公开(公告)号：WO0140742A2

公开(公告)日：2001-06-07

申请号：PCT/US0029629

申请日：2000-10-26

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT SAMUEL N ,  HALL DAVID B ,  BATHELT CARL

IPC: G01H1/00 ,  G01H9/00 ,  G01P15/093 ,  G01V1/18 ,  G02B6/00

CPC classification number: G01V1/186 ,  G01H9/004 ,  G01P15/093

Abstract: A fiber optic seismic sensor (10) includes a pair of central support members (30, 32) formed of a metal such as aluminum. A support plate (42) has an inner portion (39) retained between the central support members (30, 32) and an outer portion (41) that extends beyond the central support members (30, 32). A pair of hollow cylindrical substrates (14, 18) are mounted in axial alignment on opposite sides of the outer portion (41) of the support plate (41) with the central support members (30, 32) extending through the centers of the substrates (14, 18). The central support member (30) has a cavity (36) in one end, and the central support member (32) has a projection (38) extending therefrom and arranged to be received within the cavity (36) in the first central support member (30). The support plate (42) includes a passage (44) arranged to receive the projection (38) such that the inner portion (39) of the support plate (42) is retained between the first and second central support members (30, 32). A first spiral-wound optical fiber coil (14) is formed on an outer end (22) of the first substrate (14), and a second spiral-wound optical fiber coil (16) is formed on an outer end (26) of the second substrate (16). An interferometer (50) includes the first spiral-wound optical fiber coil (14) in a first leg and the second spiral-wound optical fiber coil (16) in a second leg. Acceleration along an axis perpendicular to the planes of the optical fiber coils (14, 16) causes a deflection in the support plate (42), which changes the difference in length of optical fiber coils (14, 16).

Abstract translation: 光纤地震传感器（10）包括由金属（例如铝）形成的一对中心支撑构件（30,32）。 支撑板（42）具有保持在中心支撑构件（30,32）之间的内部部分（39）和延伸超过中心支撑构件（30,32）的外部部分（41）。 一对中空圆柱形基板（14,18）以支撑板（41）的外部部分（41）的相对侧轴向对准地安装，中心支撑构件（30,32）延伸穿过基板的中心 （14,18）。 中心支撑构件（30）在一端具有空腔（36），并且中心支撑构件（32）具有从其延伸的突出部（38）并布置成容纳在第一中心支撑构件 （30）。 支撑板（42）包括布置成容纳突起（38）的通道（44），使得支撑板（42）的内部部分（39）保持在第一和第二中心支撑构件（30,32）之间， 。 第一螺旋卷绕光纤线圈（14）形成在第一基板（14）的外端（22）上，第二螺旋缠绕光纤线圈（16）形成在第二螺旋卷绕光纤线圈（16）的外端 第二基板（16）。 干涉仪（50）包括第一支腿中的第一螺旋缠绕光纤线圈（14）和第二支腿中的第二螺旋缠绕光纤线圈（16）。 沿着垂直于光纤线圈（14,16）的平面的轴的加速度导致支撑板（42）中的偏转，这改变了光纤线圈（14,16）的长度差。

公开(公告)号：WO02068319A2

公开(公告)日：2002-09-06

申请号：PCT/US0142606

申请日：2001-10-11

Applicant: LITTON SYSTEMS INC

Inventor： STEWART ROBERT E ,  CHERBETTCHIAN AGOP H ,  FERSHT SAMUEL N ,  HALL DAVID B

IPC: B81B3/00 ,  B81C1/00 ,  G02B6/35 ,  G02B26/08 ,  B81B7/02 ,  G02B26/02

CPC classification number: G02B26/0866 ,  B81B3/0024 ,  B81B2201/045 ,  B81B2203/0109 ,  B81B2203/051 ,  B81B2203/053 ,  G02B6/3514 ,  G02B6/3518 ,  G02B6/3546 ,  G02B6/358 ,  G02B6/3584 ,  G02B26/0841 ,  H01H2001/0042

Abstract: A bi-stable micro-actuator is formed from a first and a second silicon-on-insulator wafer fused together at an electrical contact layer. A cover has a V-groove that defines an optical axis. A collimated optical signal source in the V-groove couples an optical signal to an optical port in the V-groove. A mirror surface on the transfer member blocks or reflects the optical signal. The transfer member has a point of support at the first and second end. The central portion of the transfer member carrying a mirror is displaced from the compressive axis with transfer member in a bowed first or second state. The mirror blocks or reflects the optical axis. An expandable structure applies a compressive force between the first and second point of support along the compressive axis to hold the transfer member in a bowed first state or a bowed second state. A control signal is applied to a heating element in the expandable structure to reduce the compressive force transferring the transfer member to a second state. The central portion of the transfer member moves from a bowed first state past the compressive axis into a bowed second state to clear the optical axis.

Abstract translation: 双稳态微致动器由在电接触层处熔合在一起的第一和第二绝缘体上硅晶片形成。 盖具有限定光轴的V形槽。 V沟槽中的准直光信号源将光信号耦合到V沟槽中的光端口。 转印部件上的镜面阻挡或反射光信号。 传送构件在第一和第二端具有支撑点。 携带反射镜的转印部件的中心部分处于压缩轴线，转印部件处于弯曲的第一或第二状态。 镜子阻挡或反射光轴。 可膨胀结构沿着压缩轴线在第一和第二支撑点之间施加压缩力，以将转移构件保持在弯曲的第一状态或弓形的第二状态。 控制信号被施加到可膨胀结构中的加热元件，以减小将转印构件传递到第二状态的压缩力。 转印构件的中心部分从弯曲的第一状态经过压缩轴线移动到弯曲的第二状态以清除光轴。

公开(公告)号：WO0210774A3

公开(公告)日：2002-05-23

申请号：PCT/US0123436

申请日：2001-07-25

Applicant: LITTON SYSTEMS INC

Inventor： FERSHT SAMUEL N

IPC: G01P15/00 ,  G01P15/093 ,  G01P15/08 ,  G01H9/00 ,  G01V1/18

CPC classification number: G01P15/00 ,  G01P15/093

Abstract: A fiber optic particle motion accelerometer has a housing with a mid-section mounted therein such that the mid-section flexes in response to acceleration along a sensing axis. A proof mass is mounted to an outer edge of the mid-section. A first spiral-wound optical fiber coil is mounted to a first side of the mid-section and a second spiral-wound optical fiber coil is mounted to a second side of the mid-section. A first hinge is formed in the mid-section adjacent the mounting of the mid-section in the housing, and a second hinge is formed in the mid-section between the proof mass and the first and second fiber optic coils. The optical fiber coils are included in an outerferometer such that acceleration along the sensing axis produces a phase difference between optical signals propagating in the optical fiber coils.

Abstract translation: 光纤粒子运动加速度计具有安装在其中的中间部分的壳体，使得中间部分响应于沿感测轴线的加速度而弯曲。 检测质量安装在中段的外边缘。 第一螺旋缠绕光纤线圈安装到中间部分的第一侧，并且第二螺旋缠绕光纤线圈安装到中间部分的第二侧。 第一铰链形成在靠近壳体中间部分的安装的中间部分中，并且第二铰链形成在检测质量体与第一和第二光纤线圈之间的中间部分中。 光纤线圈包括在外部温度计中，使得沿感测轴的加速度产生在光纤线圈中传播的光信号之间的相位差。

公开(公告)号：DE69914981T2

公开(公告)日：2004-12-09

申请号：DE69914981

申请日：1999-07-28

Applicant: LITTON SYSTEMS INC

Inventor： HALL DAVID B ,  FREDERICK DONALD A ,  FERSHT SAMUEL N

IPC: G01B9/02 ,  G01H9/00 ,  G01V1/16 ,  G01V1/22

公开(公告)号：DE69528735T2

公开(公告)日：2003-03-13

申请号：DE69528735

申请日：1995-08-25

Applicant: LITTON SYSTEMS INC

Inventor： BILINSKI DONALD J ,  CHIN GENE H ,  CORDOVA AMADO ,  FERSHT SAMUEL N

IPC: G01C19/72 ,  G02B6/00 ,  G02B6/44

公开(公告)号：NO20013609D0

公开(公告)日：2001-07-20

申请号：NO20013609

申请日：2001-07-20

Applicant: LITTON SYSTEMS INC

Inventor： GOLDNER ERIC LEE ,  TWEEDY MICHAEL J ,  FERSHT SAMUEL N ,  HALL DAVID B

IPC: G01H20060101 ,  G01H9/00 ,  H04R1/46 ,  G01H