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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
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.
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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
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.
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公开(公告)号：JPH11110673A
公开(公告)日：1999-04-23
申请号：JP21462198
申请日：1998-07-29
Applicant: LITTON SYSTEMS INC
Inventor： FREDERICK DONALD A , HALL DAVID B
Abstract: PROBLEM TO BE SOLVED: To provide an optical pressure sensor having high accuracy and not requiring a wide area and also not being influenced by a loss accompanying the transmission of an optical signal, by using a contactless pressure sensor which is not electrical. SOLUTION: Plural optical couplers are connected to an optical transmission cable 16 with intervals placed and a partial signal is taken out form a pulse signal at the connection place. When a pulse optical signal transmits along the cable 16 and enters an array of an optical pressure sensor 22, plural couplers are respectively provided with an optical splitter, the sensor 22 and non pressure sensitive reflector 26, and non overlap signal pairs 30a to 30c are returned to the cable 16. The signal pairs 30a to 30c are inputted to a processor, and an intensity ratio of a pressure presentation signal 24 and a reference signal 28 which are included in the pairs 30a to 30c till here respectively is calculated. With this, because noise and loss can be compensated by using the signal 28, it is possible to acquire accurate pressure measurement value regardless of the position of the pressure sensor.
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4.发明申请
公开(公告)号：WO0135062A2
公开(公告)日：2001-05-17
申请号：PCT/US0029674
申请日：2000-10-26
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B
CPC classification number: G01D5/35383 , G01D5/35303 , G01H9/004
Abstract: An electromechanical sensor (12) produces an electrical signal in response to a change in a physical parameter being monitored. An optical phase modulator (16) is arranged such that electrical signals from the electromechanical sensor (12) causes a phase change in optical signals propagating in the two legs (46, 48) of the interferometer (44). Applying the electrical signal to the phase modulator (16) changes the optical path length difference between the interferometer legs (46, 48) and produces an optical signal that can be transmitted to a remote location. The optical signal into an electrical signal that can be processed to measure changes in the parameter.
Abstract translation: 机电传感器（12）响应于被监测的物理参数的变化而产生电信号。 光学相位调制器（16）被布置成使得来自机电传感器（12）的电信号导致在干涉仪（44）的两个腿部（46,48）中传播的光信号的相位变化。 将电信号施加到相位调制器（16）改变干涉仪支路（46,48）之间的光程长度差，并产生可以传输到远程位置的光信号。 将光信号转换成电信号，可以对其进行处理，以测量参数的变化。
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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
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。
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Patent Agency Ranking
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。
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公开(公告)号：WO9604702A3
公开(公告)日：1996-04-04
申请号：PCT/US9509258
申请日：1995-07-24
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B
CPC classification number: H01S3/137 , H01S3/1392
Abstract: The wavelength of a light source (e.g., laser) is stabilized by introducing a collimated beam from the source into a 'wedged' etalon, i.e., an etalon having a Fabry-Perot cavity that continuously decreases in width along at least one axis that is normal to the axis of beam propagation. A pair of photodetectors at the output side of the etalon detect respective portions of the beam traversing different cavity widths. The respective output signals of the photodetectors are employed in a feedback loop, whereby the wavelength of the light source is controlled so as to minimize the amplitude difference between the two photodetector signals. The wavelength of the light source can be tuned by varying the ratio of the amplitudes of the photodetector output signals. The wedged etalon can also be used as a multi-channel optical receiver, wherein a multi-wavelength collimated incident beam is introduced into the etalon. An array of photodetectors is disposed at the output side of the etalon, each located at a position corresponding to a different cavity width, so that each photodetector receives one of the component wavelengths of the incident beam.
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公开(公告)号：NO323869B1
公开(公告)日：2007-07-16
申请号：NO983282
申请日：1998-07-16
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , FREDERICK DONALD A
Abstract: A pressure measuring device which utilizes an array of optical, non-acoustic pressure sensors (22) with a laser light source (12) which generates a pulsed light signal into a light transmitting cable (16), wherein the pulsed light signal propagates along the light transmitting cable through the array of optical pressure sensors. A plurality of optical couplers (18) are attached to the light transmitting cable (16) at multiple locations spaced apart from one another in order to branch off at least a portion of the pulsed light each location. Each of the plurality of optical couplers includes a respective optical pressure sensor (22) and a pressure insensitive reflector (26), wherein the branched off portion of the pulsed light signal is transmitted into both the optical pressure sensor (22) and the reflector (26). Each optical pressure sensor (22) reflects a pressure indicating signal back into the optical coupler (18), while the pressure insensitive reflector (26) reflects a reference signal back into the optical coupler. The pressure indicating signal and the reference signal are reflected through the optical coupler (18) into the light transmitting cable as a pair of non-overlapping pulsed signals, which are then retrieved from the light transmitting cable by a signal detector (32) . The retrieved pressure indicating signal is compared with the retrieved reference signal to determine the pressure acting upon the optical pressure sensor.
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公开(公告)号：DE60111137T2
公开(公告)日：2006-05-04
申请号：DE60111137
申请日：2001-07-19
Applicant: LITTON SYSTEMS INC
Inventor： GOLDNER ERIC LEE , TWEEDY MICHAEL J , FERSHT SAMUEL N , HALL DAVID B
IPC: G01H9/00 , A61K31/164 , G01P15/093 , G01V1/18
Abstract: A displacement sensor (21) and an acceleration sensor (23) are mounted to a common support member. The displacement sensor (21) comprises a first circular flexural disk (40) having a natural frequency less than the frequency range of the acoustic waves of interest. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the first flexural disk (40). The acceleration sensor (23) comprises a second flexural disk (68) having a natural frequency greater than the frequency range of the acoustic waves. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the second flexural disk (68). A fiber optic interferometer provides an output signal that is a combination of signals output from the displacement sensor (21) and the acceleration sensor (23). The displacement sensor (21) includes an inertia ring (58) mounted to an edge of the first flexural disk (40) to keep it nearly stationary when an acoustic wave in the selected frequency range is incident upon the housing (22). The flexural disks (40, 68) include upper and lower rings (72, 74) spaced apart from the support post with portions of the disks (40, 68) between the rings (72, 74) and the support post defining hinges (75) at which the flexural disks (40, 68) flex in response to acceleration of the support member along its longitudinal axis. The surfaces of the first and second flexural disks (40, 68) preferably include grooves (84) extending between the upper rings (72) and the outer edges of the flexural disks (268, 274). The grooves (84) are arranged to allow lengths of optical fiber adjacent the rings (72, 74) to pass under the optical fiber coils (77, 79) that are formed on the surfaces of the flexural disks (40, 68).
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公开(公告)号：CA2353428C
公开(公告)日：2004-10-19
申请号：CA2353428
申请日：2001-07-23
Applicant: LITTON SYSTEMS INC
Inventor： TWEEDY MICHAEL J , FERSHT SAMUEL N , GOLDNER ERIC LEE , HALL DAVID B
IPC: G01H9/00 , G01P15/093 , G01H1/00 , G01J9/02
Abstract: A displacement sensor (21) and an acceleration sensor (23) are mounted to a common support member. The displacement sensor (21) comprises a first circular flexural disk (40) having a natural frequency less than the frequen cy range of the acoustic waves of interest. Spiral-wound optical fiber coils (5 3, 55) are mounted to opposite sides of the first flexural disk (40). The acceleration sensor (23) comprises a second flexural disk (68) having a natural frequency greater than the frequency range of the acoustic waves. Spiral-wound optical fiber coils (53, 55) are mounted to opposite sides of the second flexural di sk (68). A fiber optic interferometer provides an output signal that is a combination of signals output from the displacement sensor (21) and the acceleration sensor (23). The displacement sensor (21) includes an inertia ring (58) mounted to an edge of the first flexural disk (40) to keep it nearly stationary when an acoustic wave in the selected frequency range is incident upon the housing (22). The flexural disks (40, 68) include upper and lower rings (72, 74) spaced apart from the support post with portions of the disks (40, 68) between the rings (72, 74) and the support post defining hinges (75) at which the flexural disks (40, 6 8) flex in response to acceleration of the support member along its longitudina l axis. The surfaces of the first and second flexural disks (40, 68) preferabl y include grooves (84) extending between the upper rings (72) and the outer edges of the flexural disks (268, 274). The grooves (84) are arranged to allow lengths of optical fiber adjacent the rings (72, 74) to pass under the optical fiber coils (77, 79) that are formed on the surfaces of the flexural disks (40, 68).
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