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    PUSH-PULL TWO WAVELENGTH FABRY PEROT SENSOR FOR FIBER OPTIC ACOUSTIC SENSOR ARRAYS
    4.
    发明公开
    PUSH-PULL TWO WAVELENGTH FABRY PEROT SENSOR FOR FIBER OPTIC ACOUSTIC SENSOR ARRAYS 有权
    方法和VORRICHUNG与光纤法布里 - 珀罗传感器声学测量用两种不同波长推挽方式

    公开(公告)号：EP2304398A2

    公开(公告)日：2011-04-06

    申请号：EP09788884.6

    申请日：2009-07-09

    申请人： Northrop Grumman Guidance and Electronics Company, Inc.

    发明人： HALL, David, B.

    IPC分类号： G01H9/00

    CPC分类号： G01H9/004

    摘要： Two optical wavelengths are used to interrogate a fiber optic Fabry-Perot sensor ( 1-4) having a moveable diaphragm (34) that changes the width of a gap (36) between two reflective surfaces (38, 40). By picking the right operating point for the gap (36), the power output for one wavelength increases as the gap width changes and the power for the other wavelength decreases. A ratio of the difference of the two powers over the sum of the two powers is formed to generate a detected signal independent of power and phase fluctuations in a fiber (22) between signal sources (46, 48) and sensor (1-4) and between sensor ( 1-4) and detector (73). This ratio, which is called the visibility, has a response proportional to the pressure of acoustic disturbances that move the diaphragm (34). The push-pull sensor ( 1-4) can be used with both TDM and CW fan-out array architectures (45, 47).

    METHOD OF CONTROLLING THE DC BIAS OF AN ELECTRO-OPTIC SWITCH DRIVEN WITH POSITIVE AND NEGATIVE RF VOLTAGES
    5.
    发明公开
    METHOD OF CONTROLLING THE DC BIAS OF AN ELECTRO-OPTIC SWITCH DRIVEN WITH POSITIVE AND NEGATIVE RF VOLTAGES 审中-公开
    用于控制DC-偏压正的和负的RF电压的方法来控制电光开关

    公开(公告)号：EP2171528A1

    公开(公告)日：2010-04-07

    申请号：EP08794636.4

    申请日：2008-07-22

    申请人： Northrop Grumman Guidance and Electronics Company, Inc.

    发明人： HALL, David, B.

    IPC分类号： G02F1/01

    摘要： A method for balancing optical transmission for a first ON state and a second ON state of an electro-optic switch having an RF input port and a DC port, in one implementation, comprises the steps of associating a positive RF voltage with the first ON state of the electro-optic switch, associating a negative RF voltage with the second ON state of the electro-optic switch, wherein absolute value of the negative RF voltage associated with the second ON state is approximately equal to the positive RF voltage associated with the first ON state, and balancing optical transmission of the first ON state and the second ON state by adjusting a voltage applied to the DC port to obtain minimum optical transmission in an OFF state of the electro-optic switch.

    摘要翻译： 一种用于平衡针对第一ON状态和第二ON具有RF输入端口和DC端口的电光开关的状态的光传输方法中，在一个实现中，包括正RF电压与所述第一接通状态相关联的步骤 电光开关，关联与第二ON电光开关，worin与所述第二导通状态相关的负面RF电压的绝对值近似等于与所述第一相关联的正RF电压的状态下的负射频电压 ON状态，并且平衡第一接通状态，通过调整施加到所述DC端口以获得电光开关的关闭状态下的最小光传输的电压在第二导通状态的光传输。

    SMALL OPTICS CELL FOR MINIATURE NUCLEAR MAGNETIC RESONANCE GYROSCOPE
    9.
    发明公开
    SMALL OPTICS CELL FOR MINIATURE NUCLEAR MAGNETIC RESONANCE GYROSCOPE 有权
    小型光学小区一个微型核弹头磁旋转

    公开(公告)号：EP2350564A2

    公开(公告)日：2011-08-03

    申请号：EP09752527.3

    申请日：2009-11-05

    申请人： Northrop Grumman Guidance and Electronics Company, Inc.

    发明人： HALL, David, B.

    IPC分类号： G01C19/62 ,  G01R33/26

    CPC分类号： G01R33/26 ,  G01C19/62

    摘要： A beamsplitter (60) is arranged to split an incident laser beam into a pump beam (61) and a detection beam (83). The pump beam (61) passes through the beam splitter (60) and then reflects from a pair of mirrors (66, 78) to a quarter waveplate (74) into an interaction cell (76). After passing through the interaction cell (76), the pump beam (61) reflects from a mirror to a first photodetector. The detection beam (83) reflects from the beam splitter (60) and propagates on a path perpendicular to the path of the pump beam (61) through the interaction cell (76). After passing through the interaction cell (76), the detection beam (83) is incident upon a polarizer (84). The polarized portion of the detection beam (83) then is incident upon a photodetector (86).