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1. 发明授权

US5995207A Method for determining the phase difference of light waves propagated over two paths 失效
标题翻译：用于确定在两条路径上传播的光波的相位差的方法
公开(公告)号：US5995207A
公开(公告)日：1999-11-30
申请号：US979162
申请日：1997-11-26
申请人： David B. Hall , Donald A. Frederick , James B. Bunn , James S. Bunn, Jr.
发明人： David B. Hall , Donald A. Frederick , James B. Bunn , James S. Bunn, Jr.
IPC分类号： G01J9/00 , G01C3/08 , G01B9/02
CPC分类号： G01J9/00
摘要： The invention is a method for obtaining a measure of the light propagation time difference for two light-propagating-media paths. The first step consists of generating two substantially-identical frequency-modulated light waves whereby the frequency of the light waves is offset from a reference frequency by a different frequency increment for each basic time interval in each of a plurality of groups of three or more basic time intervals. Each frequency increment is the sum of a specified increment and a frequency-modulation-error increment. The frequency-modulation-error increments associated with the specified increments are independent of each other and unknown. The second step consists of feeding the two light waves into the entry points of two light-propagating-media paths having a light propagation time difference and obtaining a combination light wave by summing the light waves emerging from the exit points of the two light-propagating-media paths. The third step consists of calculating an estimated corrected or estimated uncorrected phase measure of the light propagation time difference for the two paths for a plurality of groups using only measured properties of the combination light wave.
摘要翻译：本发明是一种用于获得两个光传播介质路径的光传播时间差测量的方法。第一步包括产生两个基本上相同的频率调制光波，由此在三个或更多个基本的多个组中的每组中，每个基本时间间隔，光波的频率偏离参考频率不同的频率增量时间间隔。每个频率增量是指定增量和频率调制误差增量之和。与指定增量相关联的频率调制误差增量彼此独立，未知。第二步包括将两个光波馈送到具有光传播时间差的两个光传播介质路径的入口点，并通过将从两个光传播的出射点出射的光波相加获得组合光波媒体路径。第三步包括仅使用组合光波的测量属性来计算多个组的两个路径的光传播时间差的估计校正或估计的未校正相位测量。

2. 发明授权

US5452086A Interferometer amplitude modulation reduction circuit 失效
标题翻译：干涉仪幅度调制降低电路
公开(公告)号：US5452086A
公开(公告)日：1995-09-19
申请号：US34036
申请日：1993-03-22
申请人： James B. Bunn
发明人： James B. Bunn
IPC分类号： G01D5/353 , G01B9/02 , G01C19/64
CPC分类号： G01D5/35303
摘要： An interferometer amplitude modulation reduction circuit coupled to receive an interferometer output signal from the output of a fiber optic interferometer sensor. The interferometer sensor is excited by a frequency modulated input light signal from a light source having an unwanted amplitude modulation and intensity noise signal component. The interferometer output signal has both wanted interference induced intensity modulation and also unwanted amplitude modulation and intensity noise from the unwanted amplitude modulation and intensity noise signal components present on the frequency modulated input light signal. The invention circuit has a sampling means for sampling a sample portion of the frequency modulated input light signal from the output of the light source. The sampling means detects and the sample portion signal to provide a detected sample intensity signal having a detected unwanted amplitude modulation and intensity noise signal component. A detector detects the interferometer output signal from the output of the fiber optic interferometer sensor and converts the interferometer output signal into a detected AM modulated phase-generated carrier signal containing a detected unwanted amplitude modulation and intensity noise signal component. A divider scales and divides the detected AM modulated phase-generated carrier signal by the detected sample intensity signal to provide a corrected interferometer output signal. The detected unwanted amplitude modulation and intensity noise signal components common to both the detected sample intensity signal and the detected AM modulated phase-generated carrier signal are substantially canceled by the division process.
摘要翻译：干涉仪幅度调制降低电路，耦合以从光纤干涉仪传感器的输出接收干涉仪输出信号。干涉仪传感器由具有不想要的幅度调制和强度噪声信号分量的光源的调频输入光信号激发。干涉仪输出信号既有需要的干涉感应强度调制，也有来自频率调制输入光信号上存在的不想要的幅度调制和强度噪声信号分量的不需要的幅度调制和强度噪声。本发明电路具有采样装置，用于从光源的输出对采样部分的调频输入光信号进行采样。采样装置检测和采样部分信号以提供具有检测到的不需要的幅度调制和强度噪声信号分量的检测的采样强度信号。检测器检测来自光纤干涉仪传感器的输出的干涉仪输出信号，并将干涉仪输出信号转换成检测到的AM调制相位产生的载波信号，该载波信号包含检测到的不需要的幅度调制和强度噪声信号分量。分频器通过检测到的采样强度信号对所检测到的AM调制相位产生的载波信号进行分频，并将其校正，以提供经校正的干涉仪输出信号。检测到的采样强度信号和检测到的AM调制相位产生的载波信号共同的检测到的不需要的幅度调制和强度噪声信号分量基本上被除法处理消除。

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