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    • 42. 发明授权
    • Backscatter error reducer for interferometric fiber optic gyroscope
    • 用于干涉光纤陀螺仪的后向散射误差减小器
    • US5781300A
    • 1998-07-14
    • US741464
    • 1996-10-31
    • Lee K. StrandjordGlen A. SandersBogdan SzafraniecRalph A. Bergh
    • Lee K. StrandjordGlen A. SandersBogdan SzafraniecRalph A. Bergh
    • G01C19/72
    • G01C19/72
    • A backscatter or secondary wave error reducer for an interferometric fiber optic gyroscope having at least one phase modulator for receiving a square wave bias phase modulation signal and a sine wave carrier suppression modulation signal. The amplitude of the carrier suppression modulation signal is sufficient to greatly reduce the interference between two sets of backscattered or secondary waves of light originating in the Sagnac loop of the gyroscope. Reduction or elimination of the interference of the two sets of secondary waves reduces or eliminates the secondary wave induced rotation rate sensing error. The frequency of the carrier suppression signal is near or equal to an even harmonic of the proper frequency of the Sagnac loop to reduce the sinusoidal or periodic rotation rate sensing error caused by the carrier suppression modulation signal.
    • 一种用于干涉光纤陀螺仪的后向散射或二次波衰减器,其具有用于接收方波偏置相位调制信号和正弦波载波抑制调制信号的至少一个相位调制器。 载波抑制调制信号的幅度足以大大减少源自陀螺仪的Sagnac回路的两组反向散射光或二次波之间的干扰。 减少或消除两组二次波的干扰减少或消除二次波感应的旋转速率感测误差。 载波抑制信号的频率接近或等于Sagnac环路的适当频率的偶次谐波,以减少由载波抑制调制信号引起的正弦或周期性转速检测误差。
    • 43. 发明授权
    • Fiber optic gyroscope output noise reducer
    • 光纤陀螺输出降噪器
    • US5469257A
    • 1995-11-21
    • US158116
    • 1993-11-24
    • James N. BlakeGlen A. SandersLee K. Strandjord
    • James N. BlakeGlen A. SandersLee K. Strandjord
    • G01C19/72
    • G01C19/721
    • A noise reducer for reducing the results in the system output signal of optical noise introduced into an optical subsystem therein, having a phase modulator, by a source through obtaining a noise representation signal used to offset the noise components in the signal obtained from the output of the optical subsystem. This noise representation signal is not delayed in the obtaining thereof by any more than half the delays of the waves emitted from the source in reaching the optical subsystem output. The noise reducer may incorporate a device for adjusting the amplitude of the noise representation signal. It may also include another device for adjusting the phase of the noise representation signal, which may be used to affect the amplitude of the noise representation signal. These adjustments can result in an optimization of the noise representation signal so as to better effectively cancel the optical noise signal at the output of the fiber optic gyro having the noise reducer. The phase adjustment may be accomplished by affecting the phase of the bias modulation signal that goes to demodulate the fiber optic gyroscope system output signal or to demodulate both the fiber optic gyroscope system output signal and the noise representation signal, before the two latter signals are combined. A generator may be used for constructing a periodic signal, such as a triangular wave, having an appropriate amplitude and phase, to be a noise representation signal that is used to offset or cancel the noise components in the output signal from the fiber optic gyroscope system.
    • 一种降噪器,用于通过获得噪声表示信号来减少引入到其中的光学子系统中的光学子系统中的光学系统输出信号的结果,该信号由相位调制器通过获得用于偏移从输出中获得的信号中的噪声分量的噪声表示信号 光子系统。 在获得噪声表示信号时,该噪声表示信号在到达光学子系统输出时从源发射的波的延迟的一半以上不被延迟。 降噪器可以包括用于调整噪声表示信号的幅度的装置。 它还可以包括用于调整噪声表示信号的相位的另一装置,其可以用于影响噪声表示信号的幅度。 这些调整可以导致噪声表示信号的优化,以便更有效地抵消具有降噪器的光纤陀螺仪的输出处的光噪声信号。 相位调整可以通过在两个后一个信号组合之前影响去解调光纤陀螺仪系统输出信号或解调光纤陀螺仪系统输出信号和噪声表示信号的偏置调制信号的相位 。 发生器可以用于构造具有适当的幅度和相位的诸如三角波的周期信号,作为用于偏移或消除来自光纤陀螺仪系统的输出信号中的噪声分量的噪声表示信号 。
    • 44. 发明授权
    • Fiber optic gyroscope modulation amplitude control
    • 光纤陀螺调制幅度控制
    • US5384637A
    • 1995-01-24
    • US684721
    • 1991-04-12
    • Glen A. SandersLee K. Strandjord
    • Glen A. SandersLee K. Strandjord
    • G01C19/72G01B9/02
    • G01C19/727
    • An amplitude reset controller for a resonator fiber optic gyroscope using a feedback loop and modulation to control amplitudes of a serrodyne waveform provided by a serrodyne signal generator at an operation frequency depending on resonance conditions in the resonator. The controller with a single serrodyne signal generator switches between such control at greater rotation rates and the removal of such control at smaller rotation rates, using instead a reference command. Also, a blanking operation mode can be additionally used to eliminate signals controlling the controlled frequency adjustment signal generator operation frequency during phase resets in its output serrodyne signal.
    • 一种用于谐振器光纤陀螺仪的振幅复位控制器,其使用反馈环路和调制,以根据谐振器中的谐振条件以操作频率来控制由serrodyne信号发生器提供的serrodyne波形的幅度。 具有单个serrodyne信号发生器的控制器以更大的旋转速率在这种控制之间切换,并且以较小的旋转速率移除这种控制,而使用参考命令。 另外,也可以使用消隐操作模式来消除控制频率调节信号发生器工作频率在输出信号信号相位复位期间的信号。
    • 47. 发明申请
    • BIAS-INSTABILITY REDUCTION IN FIBER OPTIC GYROSCOPES
    • 光纤陀螺中的偏置不稳定性降低
    • US20100033729A1
    • 2010-02-11
    • US12187932
    • 2008-08-07
    • Tiequn QiuSteven J. SandersSorin MosorGlen A. Sanders
    • Tiequn QiuSteven J. SandersSorin MosorGlen A. Sanders
    • G01C19/72G06G7/48
    • G01C19/64
    • A computer-implementable method of reducing bias instability in a fiber optic gyroscope includes receiving, with a computer, a first data set enabling the computer to generate a model of the gyroscope, including a light source, a photodetector, and a plurality of optical components and fiber sections coupling the light source to the photodetector, and a light signal to be propagated from the light source to the photodetector. The light signal has an associated wavelength spectrum. For each wavelength of the spectrum, the relative lightwave intensity reaching the photodetector is calculated. A signal-wave intensity and a spurious-wave intensity are determined from the calculated relative lightwave intensities. A scale factor is determined from the signal-wave intensity. The spurious-wave intensity is integrated over the wavelength spectrum of the light source to obtain a total spurious-wave intensity. A rate bias error is determined based on the total spurious-wave intensity and the scale factor.
    • 一种降低光纤陀螺仪中的偏压不稳定性的计算机可实现的方法包括:利用计算机接收第一数据组,使得该计算机能够生成陀螺仪的模型,该模型包括光源,光电检测器和多个光学部件 以及将光源耦合到光电检测器的光纤部分,以及从光源传播到光电检测器的光信号。 光信号具有相关的波长谱。 对于光谱的每个波长,计算到达光电检测器的相对光波强度。 从计算的相对光波强度确定信号波强度和寄生波强度。 从信号波强度确定比例因子。 寄生波强度集成在光源的波长光谱上,以获得总的杂散波强度。 基于总杂散波强度和比例因子确定速率偏差误差。
    • 48. 发明申请
    • FIBER OPTIC CHEMICAL SENSOR
    • 光纤化学传感器
    • US20090067775A1
    • 2009-03-12
    • US11757904
    • 2007-06-04
    • Glen A. Sanders
    • Glen A. Sanders
    • G02B6/00
    • G01N21/7746G01N2021/7716G01N2021/7776G02B6/02009G02B6/02304G02B6/02333G02B6/024G02B6/4228
    • Optical systems for sensing chemicals. An example system includes a light source, a light sensor, a processing device in signal communication with the light source and the light sensor, and a fiber optic cable that receives light from the light source and delivers light to the light sensor. The fiber optic cable includes a cladding material that is permeable to a predefined substance and an optical fiber core surrounded by the cladding material. The optical fiber core is a single mode optical fiber having a diameter greater than 30 μm. The optical fiber core includes a hollow center having a diameter between 1-50 μm. The optical fiber core includes a plurality of lengthwise holes positioned to provide single mode light propagation properties. The plurality of lengthwise holes have a diameter between 0.2-4 μm.
    • 用于感应化学品的光学系统。 示例性系统包括光源,光传感器,与光源和光传感器信号通信的处理设备,以及光纤电缆,其从光源接收光并将光传送到光传感器。 光纤电缆包括对预定物质是可渗透的包层材料以及由包层材料包围的光纤芯。 光纤芯是直径大于30μm的单模光纤。 光纤芯包括直径在1-50μm之间的中空中心。 光纤芯包括多个纵向孔,其定位成提供单模光传播特性。 多个纵向孔的直径在0.2-4μm之间。
    • 49. 发明申请
    • Fiber optic current sensor and method for sensing current using the same
    • 光纤电流传感器及其使用方法
    • US20080159684A1
    • 2008-07-03
    • US11647654
    • 2006-12-29
    • Glen A. SandersSteve J. Sanders
    • Glen A. SandersSteve J. Sanders
    • G01R33/032
    • G01R15/246
    • An apparatus for sensing current and a method for sensing current are provided. The apparatus includes an optical fiber having first and second opposing ends and a hollow passageway therethrough, a recirculator configured such that when light propagates from the respective first and second ends of the optical fiber, at least some of the light is reflected by the recirculator into the respective opposing ends of the optical fiber to propagate through the optical fiber and form an optical loop having an opening therethrough, and a Faraday sensitive material positioned in the optical loop such that the light passes therethrough, an index of refraction of the Faraday sensitive material changes when a current flows through the opening of the optical loop.
    • 提供一种用于感测电流的装置和用于感测电流的方法。 该设备包括具有第一和第二相对端和穿过其中的中空通道的光纤,再循环器构造成使得当光从光纤的相应的第一和第二端传播时,至少一些光被再循环器反射成 光纤的相对端部通过光纤传播并形成具有开口的光学环路,以及位于光学环路中的法拉第敏感材料,使得光通过其中,法拉第敏感材料的折射率 当电流流过光环路的开口时发生变化。
    • 50. 发明授权
    • Sensor using ultra thin waveguides and optical fibers
    • 传感器采用超薄波导和光纤
    • US07336859B2
    • 2008-02-26
    • US11321158
    • 2005-12-28
    • Glen A. Sanders
    • Glen A. Sanders
    • G02B6/00G02B6/02
    • G01N21/552G01N21/7703G01N21/7746G01N21/94G01N2021/7783G01N2201/0873G01N2201/088G02B6/107
    • Methods and apparatus are provided for detecting one or more contaminant particles in an environment with an optical sensor. The sensor includes at least one optical waveguide in a resonant arrangement and a light source positioned in an environment in which the presence of a contaminant particle is sought to be determined. The at least one optical waveguide is of a diameter that an evanescent tail of the lightwave extending there through extends into the environment and is reactive to at least one contaminant particle in the surrounding environment. A detector is positioned to receive light indicative of the sharpness of the optical resonance lineshape of the optical resonator at a pre-selected optical wavelength. The detected information determines the specific contaminant particle in the environment and the concentration of the contaminant particle in the environment.
    • 提供了用于利用光学传感器检测环境中的一种或多种污染物颗粒的方法和装置。 传感器包括至少一个谐振装置中的光波导和位于其中寻求确定污染物颗粒的存在的环境中的光源。 至少一个光波导具有直径延伸到其中的光波的渐逝尾部延伸到环境中并且对周围环境中的至少一种污染物质具有反应性的直径。 检测器被定位成以预选的光波长接收指示光学谐振器的光学谐振线形状的清晰度的光。 检测到的信息确定环境中的特定污染物颗粒和环境中污染物颗粒的浓度。