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公开(公告)号：NO982586L
公开(公告)日：1998-12-07
申请号：NO982586
申请日：1998-06-05
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , FERSHT SAMUEL N
Abstract: A system (10) for measuring changes in an environmental parameter, such as velocity or pressure, includes an optical signal source (11, 12, 13) for providing a pulsed, coherent light signal, and an interferometer having first and second optical legs (33, 35) of unequal optical path lengths. The signal is split into first and second beams that are respectively directed into the first and second optical legs of the interferometer. A fixed mirror (41) reflects the first beam received at the end of the first optical leg (33) . An optical pick-off (51) includes a movable mirror, positioned to reflect the second beam received from the end of the second optical leg (35). The movable mirror is movable in response to changes in the value of the parameter to be measured. An optical coupler (38) combines the first and second beams after they have been reflected back into their respective optical legs, producing an interference signal, which is detected by an optical detector (39). The detector (39) generates an electronic signal having a value indicative of the value of the interference signal. The electronic signal is analyzed to correlate its value to changes in the value of the environmental parameter to be measured.
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公开(公告)号：CA2117416A1
公开(公告)日：1996-01-26
申请号：CA2117416
申请日：1994-07-25
Applicant: LITTON SYSTEMS INC
Inventor： CORDOVA AMADO , BILINSKI DONALD J , FERSHT SAMUEL N , SURABIAN GLENN M , WILDE JOHN D , HINMAN PAUL A
IPC: G01C19/72
Abstract: A sensor coil for a fiber optic gyroscope. The coil is formed on a spool of carbon composite material or of another material whose coefficient of thermal expansion approximates that of the overlying windings of the glass optical fiber. The windings are potted in an adhesive material. Various bias effects are addressed by the coil design. The close matching of the thermal expansion characteristics of the spool and the fiber windings as well as proper selection of the coil potting material minimizes the Shupe-like bias caused by thermal stress that would be otherwise exerted by a standard metallic spool. By careful selection of potting material (particularly its modulus of elasticity) vibration-induced bias, coil cracking, degradation of h-parameter and temperature-ramp bias sensitivity are also minimized.
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公开(公告)号：CA2016808A1
公开(公告)日：1991-06-26
申请号：CA2016808
申请日：1990-05-15
Applicant: LITTON SYSTEMS INC
Inventor： FERSHT SAMUEL N , WYSE STANLEY F
IPC: G01C19/5607 , G01P13/00
Abstract: A vibrating rotation rate sensor of the type that includes a generally-planar, H-shaped frame of piezoelectric material such as quartz. A first set of drive electrodes is fixed to a pair of upper tines and a second set of pickoff electrodes is fixed to a pair of lower tines. An array of control electrodes is fixed to the upper tine pair adjacent the cross-piece of the H-shaped frame. The control electrodes permit the application of control signals for nulling coriolisinduced out-of-plane vibration of the upper tines allowing use of a resonant frame.
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公开(公告)号：DE3500045A1
公开(公告)日：1985-08-01
申请号：DE3500045
申请日：1985-01-03
Applicant: LITTON SYSTEMS INC
Inventor： FERSHT RENA S , FERSHT SAMUEL N
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公开(公告)号：NO844461A
公开(公告)日：1985-07-31
申请号：NO844461
申请日：1984-11-08
Applicant: LITTON SYSTEMS INC
Inventor： FERSHT RENA S , FERSHT SAMUEL N
CPC classification number: G01C19/70
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Patent Agency Ranking
公开(公告)号：DE69829022T2
公开(公告)日：2006-02-09
申请号：DE69829022
申请日：1998-07-24
Applicant: LITTON SYSTEMS INC
Inventor： WYSE STANLEY F , STEWART ROBERT E , FERSHT SAMUEL N
IPC: G01C19/56
Abstract: A mounting plate is placed in a housing with a plurality of compliant, damped pads arranged between the housing and the mounting plate. A hub arranged to produce rotational oscillations about a drive axis extends from the mounting plate, and a first drive member is connected to the hub. A first sensing apparatus having a support element is connected to the drive member to transmit rotational oscillations of the drive member about the drive axis to the support element. The first sensing apparatus includes a sensing element connected to the support element and arranged to oscillate with the support element about the drive axis. The sensing element is arranged to oscillate rotationally relative to the support element about a sensing axis perpendicular to the drive axis for input rotation rates of the frame about an input axis which is perpendicular to both the sensing axis and the drive axis. A second drive member is connected to the first drive member and is arranged to produce rotational oscillations about the drive axis that are opposite in direction to the rotational oscillations produced by the first drive member. The second sensing apparatus has a second sensing element arranged to oscillate rotationally relative to the support element about second sensing axis that is parallel to the first sensing axis.
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公开(公告)号：DE69829022D1
公开(公告)日：2005-03-24
申请号：DE69829022
申请日：1998-07-24
Applicant: LITTON SYSTEMS INC
Inventor： WYSE STANLEY F , STEWART ROBERT E , FERSHT SAMUEL N
IPC: G01C19/56
Abstract: A mounting plate is placed in a housing with a plurality of compliant, damped pads arranged between the housing and the mounting plate. A hub arranged to produce rotational oscillations about a drive axis extends from the mounting plate, and a first drive member is connected to the hub. A first sensing apparatus having a support element is connected to the drive member to transmit rotational oscillations of the drive member about the drive axis to the support element. The first sensing apparatus includes a sensing element connected to the support element and arranged to oscillate with the support element about the drive axis. The sensing element is arranged to oscillate rotationally relative to the support element about a sensing axis perpendicular to the drive axis for input rotation rates of the frame about an input axis which is perpendicular to both the sensing axis and the drive axis. A second drive member is connected to the first drive member and is arranged to produce rotational oscillations about the drive axis that are opposite in direction to the rotational oscillations produced by the first drive member. The second sensing apparatus has a second sensing element arranged to oscillate rotationally relative to the support element about second sensing axis that is parallel to the first sensing axis.
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公开(公告)号：DE69723409T2
公开(公告)日：2004-06-09
申请号：DE69723409
申请日：1997-10-02
Applicant: LITTON SYSTEMS INC
Inventor： CORDOVA AMADO , FERSHT SAMUEL N
Abstract: A fibre optic gyroscope has a sensor coil (18). At least one dummy layer (24) forms an integral structure with, and shares the thermal expansion characteristics of, a potted coil (18) comprising a plurality of layers of windings of a first optical fibre. In the gyroscope, the potted coil (18) is arranged to receive the output of a source of optical energy (10) as a pair of beams that counter-propagate therein and to provide the resultant interference pattern, as gyro output, to a detector (16). The dummy layer (24) displaces layers or windings of the potted coil from regions likely to contribute to Shupe bias effects.
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公开(公告)号：BR9801787A
公开(公告)日：1999-06-15
申请号：BR9801787
申请日：1998-06-05
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , FERSHT SAMUEL N
Abstract: A system (10) for measuring changes in an environmental parameter, such as velocity or pressure, includes an optical signal source (11, 12, 13) for providing a pulsed, coherent light signal, and an interferometer having first and second optical legs (33, 35) of unequal optical path lengths. The signal is split into first and second beams that are respectively directed into the first and second optical legs of the interferometer. A fixed mirror (41) reflects the first beam received at the end of the first optical leg (33) . An optical pick-off (51) includes a movable mirror, positioned to reflect the second beam received from the end of the second optical leg (35). The movable mirror is movable in response to changes in the value of the parameter to be measured. An optical coupler (38) combines the first and second beams after they have been reflected back into their respective optical legs, producing an interference signal, which is detected by an optical detector (39). The detector (39) generates an electronic signal having a value indicative of the value of the interference signal. The electronic signal is analyzed to correlate its value to changes in the value of the environmental parameter to be measured.
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公开(公告)号：CA2236201A1
公开(公告)日：1998-12-06
申请号：CA2236201
申请日：1998-04-28
Applicant: LITTON SYSTEMS INC
Inventor： FERSHT SAMUEL N , HALL DAVID B
Abstract: A system for measuring changes in an environmental parameter, such as velocity or pressure, includes an optical signal source for providing a pulsed, coherent light signal, and an interferometer having a first and second optical legs of unequal optical path lengths. The signal is split into first and second beams that are respectively directed into the first and second optical legs of the interferometer. A fixed mirror reflects the first beam received at the end of the first optical leg. An optical pick-off includes a movable mirror, positioned to reflect the second beam received from the end of the second optical leg. The movable mirror is movable in response to changes in the value of the parameter to be measured. An optical coupler combines the first and second beams after they have been reflected back into their respective optical legs, producing an interference signal, which is detected by an optical detector. The detector generates an electronic signal having a value indicative of the value of the interference signal. The electronic signal is analyzed to correlate its value to changes in the value of the environmental parameter to be measured.
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