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公开(公告)号：CA1212992A
公开(公告)日：1986-10-21
申请号：CA447971
申请日：1984-02-21
Applicant: LITTON SYSTEMS INC
Inventor： LAM LEO K , PHILLIPS EDWARD
Abstract: A method and apparatus for optical pumping of an NMR cell by means of laser light. A current driver provides an a.c. current waveform as injection current to a laser diode. The resulting laser intensity spectrum closely approximates the absorption spectrum of the cell to thereby increase the signal generated for a given power input.
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公开(公告)号：CA1340367C
公开(公告)日：1999-02-02
申请号：CA596485
申请日：1989-04-12
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , LAM LEO K
IPC: G01C19/66
Abstract: Disclosed herein is a multi-pole magnetic geometry for a multi-oscillator ring laser gyroscope. Multi-pole magnetic geometry configurations are disclosed which are useful for providing Faraday rotation where the multi-oscillator uses a Faraday rotator and high magnetic field effect where the nature of the multi-oscillator ring laser gyroscope is of split gain configuration. The multi-post magnetic geometry includes a plurality of top or bottom loaded diametrically opposed north and south pole axially directed magnets which are positioned substantially transverse to the optical pathway but suitable for providing axially directed magnetic fields to portions of the optical pathway only where desired. The multi-pole magnetic geometry disclosed herein substantially produces a magnetic flux that is restricted in its position to localized portions of the optical pathway with low far field effects.
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公开(公告)号：FR2729753A1
公开(公告)日：1996-07-26
申请号：FR9001505
申请日：1990-02-09
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID BARNETT , LAM LEO K
IPC: G01C19/66
Abstract: The gyroscope includes a closed pathway defined by a bore cavity providing out-of-plane reciprocal image rotation of a number of electromagnetic waves propagating within the path way. A device is included for providing non-reciprocal polarisation rotation of the waves including magnetic device. The latter includes a number of external magnetic elements, each of which is adjustably mounted for rotation about its own axis and transversely directed with respect to the bore cavity defining the closed pathway. The magnetic elements are cylindrically-shaped posts made from a permanent magnetic material where the north and south poles of each magnetic element are each positioned on opposite sides of a diameter of each of the posts.
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Patent Agency Ranking
公开(公告)号：DE4003800A1
公开(公告)日：1996-07-11
申请号：DE4003800
申请日：1990-02-08
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , LAM LEO K
Abstract: The gyroscope includes a closed pathway defined by a bore cavity providing out-of-plane reciprocal image rotation of a number of electromagnetic waves propagating within the path way. A device is included for providing non-reciprocal polarisation rotation of the waves including magnetic device. The latter includes a number of external magnetic elements, each of which is adjustably mounted for rotation about its own axis and transversely directed with respect to the bore cavity defining the closed pathway. The magnetic elements are cylindrically-shaped posts made from a permanent magnetic material where the north and south poles of each magnetic element are each positioned on opposite sides of a diameter of each of the posts.
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公开(公告)号：GB2137357B
公开(公告)日：1987-01-14
申请号：GB8405311
申请日：1984-02-29
Applicant: LITTON SYSTEMS INC
Inventor： LAM LEO K , PHILLIPS EDWARD
Abstract: A method and apparatus for optical pumping of an NMR cell by means of laser light. A current driver provides an a.c. current waveform as injection current to a laser diode. The resulting laser intensity spectrum closely approximates the absorption spectrum of the cell to thereby increase the signal generated for a given power input.
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公开(公告)号：GB2302203B
公开(公告)日：1997-07-02
申请号：GB8928719
申请日：1989-12-20
Applicant: LITTON SYSTEMS INC
Inventor： HALL DAVID B , LAM LEO K
IPC: G01C19/66
Abstract: Disclosed herein is a multi-pole magnetic geometry for a multi-oscillator ring laser gyroscope. Multi-pole magnetic geometry configurations are disclosed which are useful for providing Faraday rotation where the multi-oscillator uses a Faraday rotator and high magnetic field effect where the nature of the multi-oscillator ring laser gyroscope is of split gain configuration. The multi-post magnetic geometry includes a plurality of top or bottom loaded diametrically opposed north and south pole axially directed magnets which are positioned substantially transverse to the optical pathway but suitable for providing axially directed magnetic fields to portions of the optical pathway only where desired. The multi-pole magnetic geometry disclosed herein substantially produces a magnetic flux that is restricted in its position to localized portions of the optical pathway with low far field effects.
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公开(公告)号：DE4239438A1
公开(公告)日：1995-04-06
申请号：DE4239438
申请日：1992-11-23
Applicant: LITTON SYSTEMS INC
Inventor： MARTIN GRAHAM JOHN , LAM LEO K
Abstract: A triaxial multi-oscillator for operation in accordance with an operation mode which requires superposition of an essentially uniform axial magnetic field on the amplification range of each laser cavity, contains an integral frame of glass-ceramic material, having twelve faces which are in each case rhombic, and contains three closed laser cavities which in each case consist of four straight segments. The cavities contain three mutually parallel segments, respectively one for each cavity, which are arranged at regular intervals on a circle perpendicular to the axis of the frame. An inner cathode and six anodes are assigned to the frame, in order to produce amplification in each of the three segments. The frame is positioned inside a closed cylindrical soft-iron element by means of a fastening system. The fastening system holds magnets next to the upper and lower ends of the element, in order to produce parallel magnetic flux lines therein. The frame is arranged inside the container in such a way that the cavity segments which contain the three amplification regions, are aligned with the parallel flux lines, in order to produce the required axial fields in the three amplification regions.
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公开(公告)号：GB2137357A
公开(公告)日：1984-10-03
申请号：GB8405311
申请日：1984-02-29
Applicant: LITTON SYSTEMS INC
Inventor： LAM LEO K , PHILLIPS EDWARD
Abstract: A method and apparatus for optical pumping of an NMR cell by means of laser light. A current driver provides an a.c. current waveform as injection current to a laser diode. The resulting laser intensity spectrum closely approximates the absorption spectrum of the cell to thereby increase the signal generated for a given power input.
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