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公开(公告)号：US5294075A
公开(公告)日：1994-03-15
申请号：US752109
申请日：1991-08-28
摘要： An optical position sensing system for sensing the position of a displaceable element. An electro-optical unit outputs a modulated optical signal and a chirped rf signal. The envelope of the modulated optical signal has a phase that has a known relation to the phase of the chirped rf signal. The electro-optical unit is coupled to a light guide element and receives and transmits the modulated optical signal along an optical path for reflection off a surface of the displaceable element in order to provide a position sensing optical signal. A reference reflecting element is disposed in the optical path upstream of the displaceable element for partially reflecting the transmitted modulated optical signal in order to provide a reference optical signal. A transducing unit receives the rf signal at one input and has another input optically coupled for receiving the position sensing optical signal and the reference optical signal which have, respectively, first and second time delays with respect to the chirped rf signal. The transducing unit produces a multi-frequency electrical signal which includes first and second frequencies corresponding to the first and second time delays, respectively. A position detecting unit coupled to the output of the transducing unit processes the multi-frequency signal in order to determine a difference frequency corresponding to the difference between the first and second frequencies and representing the position of the displaceable element.
摘要翻译： 一种光学位置检测系统，用于感测位移元件的位置。 电光单元输出调制光信号和啁啾rf信号。 调制光信号的包络具有与啁啾rf信号的相位已知关系的相位。 电光单元耦合到光导元件，并且沿着光路接收并发射调制的光信号，用于反射离开可移位元件的表面，以便提供位置感测光信号。 参考反射元件设置在可移动元件的上游的光路中，用于部分地反射发射的调制光信号，以便提供参考光信号。 转换单元在一个输入处接收rf信号，并且具有光耦合的另一输入，用于接收相对于啁啾rf信号分别具有第一和第二时间延迟的位置感测光信号和参考光信号。 转换单元产生分别包括对应于第一和第二时间延迟的第一和第二频率的多频电信号。 耦合到转换单元的输出的位置检测单元处理多频信号，以便确定与第一和第二频率之间的差对应的差频，并表示可移位元件的位置。
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公开(公告)号：US5422477A
公开(公告)日：1995-06-06
申请号：US130509
申请日：1993-10-01
摘要： An optical sensing system with a rotation sensor head for sensing the rotation of a rotatable object while simultaneously sensing the position of a displaceable object with a position sensor head. An electro-optical unit outputs a modulated optical signal and a chirped rf signal. The envelope of the modulated optical signal has a phase that has a known relation to the phase of the chirped rf signal. The electro-optical unit is coupled to a light guide element and receives and transmits the modulated optical signal along an optical path for reflection off a disk secured to the rotatable object in order to provide a rotation sensing optical signal. A transducing unit receives the rf signal at one input and has another input optically coupled to receive the rotation sensing optical signal while simultaneously receiving position sensing optical signals from the position sensor heads. The transducing unit produces a multi-frequency electrical signal which includes first and second frequencies, the first frequency corresponding to the rotation sensor location and the difference between the first and second frequencies corresponding to the rotation rate of the rotatable object. A rotation detecting unit coupled to the output of the transducing unit processes the multi-frequency signal in order to determine the difference frequency corresponding to the rotation rate of the rotatable object.
摘要翻译： 一种光学感测系统，其具有用于感测可旋转物体的旋转的旋转传感器头，同时利用位置传感器头感测位移物体的位置。 电光单元输出调制光信号和啁啾rf信号。 调制光信号的包络具有与啁啾rf信号的相位已知关系的相位。 电光单元耦合到光导元件，并且沿着光路接收并发送经调制的光信号，用于从固定到可旋转对象的盘反射，以提供旋转感测光信号。 转换单元在一个输入处接收rf信号，并具有光耦合的另一个输入，以接收旋转感测光信号，同时从位置传感器头接收位置感测光信号。 转换单元产生多频电信号，该多频电信号包括第一和第二频率，对应于旋转传感器位置的第一频率以及对应于可旋转物体的转速的第一和第二频率之间的差。 耦合到转换单元的输出的旋转检测单元处理多频信号，以便确定与可旋转物体的旋转速度对应的差频。
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公开(公告)号：US5467942A
公开(公告)日：1995-11-21
申请号：US130519
申请日：1993-10-01
摘要： An optical sensing system for sensing the temperature at a first location, including: electro-optical unit for producing a modulated optical signal and a light guide unit for receiving and transmitting the modulated optical signal along an optical path. The optical system further includes temperature sensing fiber which receives and guides the modulated optical signal along a temperature sensing optical path. One portion of the modulated optical signal serves as a reference optical signal and another portion of the modulated optical signal serves as a target optical signal. The optical sensor system also has a transducing unit, which receives the reference optical signal, the target optical signal having first and second time delays with respect to a chirped rf signal from the electro-optical unit. The transducing unit produces a multi-frequency electrical signal which includes a first frequency corresponding to the first time delay a second frequency corresponding to the second time delay. The optical sensor system further has a temperature detecting means coupled to the output of the transducing unit which processes the multi-frequency signal and determines a difference frequency corresponding to the temperature at the first location.
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公开(公告)号：US09158137B1
公开(公告)日：2015-10-13
申请号：US13601726
申请日：2012-08-31
申请人： Gregory L. Abbas
发明人： Gregory L. Abbas
IPC分类号： G02F1/01 , H04B10/508
CPC分类号： H04B10/564 , G02F1/0123 , H04B10/2575 , H04B10/50575 , H04B10/508 , H04B10/54 , H04J14/005
摘要： An optical modulator has a continuous wave laser input, an RF input, a bias and dither input and an output. A photodiode connected to an output tap produces a voltage that is amplified. Noise is removed from the amplified output. A spread-spectrum dither harmonic is generated and supplied to a multiplier with the amplified and filtered feedback and is used to create a DC bias. A spread-spectrum dither is created and added to the DC bias. Spread spectrum dither and bias both are applied to the bias input of optical modulator. The bias and spread spectrum dither controller is usable with other non-optical modulators and other electronic devices.
摘要翻译： 光调制器具有连续波激光输入，RF输入，偏置和抖动输入和输出。 连接到输出抽头的光电二极管产生被放大的电压。 从放大的输出中消除噪声。 产生扩频抖动谐波并将其提供给具有放大和滤波反馈的乘法器，并用于产生DC偏置。 产生扩频抖动并将其添加到DC偏置。 扩频抖动和偏置两者都应用于光调制器的偏置输入。 偏置和扩频抖动控制器可用于其它非光学调制器和其他电子设备。
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