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    • 2. 发明授权
    • Encoder signal analysis system for high-resolution position measurement
    • 用于高分辨率位置测量的编码器信号分析系统
    • US5933106A
    • 1999-08-03
    • US890741
    • 1997-07-11
    • Gang HeHarry A. Atwater
    • Gang HeHarry A. Atwater
    • H03M5/22
    • H03M5/22
    • A signal analysis system for processing quadrature analog waveforms from an encoder. High-resolution position measurements for external measurement devices are obtained. A hardware component receives the quadrature analog signals from the encoder and processes these signals to generate low and high-resolution waveforms. These waveforms are then further processed and sent as first and second data streams to a computational component of the signal analysis system. The absolute phase angle (.THETA.) of the encoder's analog signal is determined by processing the data streams with the computational component. .THETA. is compared to a series of calibration factors to determine the position of the translating component of the external measurement device.
    • 用于处理来自编码器的正交模拟波形的信号分析系统。 获得外部测量装置的高分辨率位置测量。 硬件组件从编码器接收正交模拟信号,并处理这些信号以产生低分辨率和高分辨率波形。 然后将这些波形进一步处理并作为第一和第二数据流发送到信号分析系统的计算部件。 编码器模拟信号的绝对相位角(THETA)是通过用计算分量处理数据流来确定的。 将THETA与一系列校准因子进行比较,以确定外部测量装置的平移部件的位置。
    • 10. 发明授权
    • Ferroelectric nanophotonic materials and devices
    • 铁电纳米光子材料和器件
    • US07346248B2
    • 2008-03-18
    • US11497935
    • 2006-08-01
    • Harry A. AtwaterKaushik BhattacharyaKaushik DayalMatthew DickenDemetri PsaltisAxel SchererGuruswami Ravichandran
    • Harry A. AtwaterKaushik BhattacharyaKaushik DayalMatthew DickenDemetri PsaltisAxel SchererGuruswami Ravichandran
    • G02B6/00
    • G02F1/03B82Y20/00G02B6/3574G02F2202/32
    • Systems and methods for manipulating light with tunable ferroelectric photonic devices. Devices having tunable properties that exhibit photonic bandgap behavior are fabricated from ferroelectric materials. Apparatus is provided to apply tuning signals to the ferroelectric material using one or more of electric fields, mechanical forces, optical fields, and thermal fields. Control circuitry is provided to generate the control signals needed to apply the tuning signals. Input and output ports are provided to allow input signals to be received and to provide output signals. In some cases, a feedback loop is provided to use a portion of the output signal as a diagnostic signal for control of the operation of the device within an acceptable range. It is expected that ferroelectric photonic devices operating according to principles of the invention will be useful for a wide variety of applications, including optical switching, optical modulation, optical computing, and performing logic optically.
    • 用可调谐铁电光子器件操纵光的系统和方法。 具有光子带隙特性的具有可调谐特性的器件由铁电材料制成。 提供了使用电场,机械力,光场和热场中的一个或多个来将调谐信号施加到铁电材料的装置。 提供控制电路以产生应用调谐信号所需的控制信号。 提供输入和输出端口以允许接收输入信号并提供输出信号。 在一些情况下,提供反馈回路以使用输出信号的一部分作为用于在可接受范围内控制装置的操作的诊断信号。 期望根据本发明的原理操作的铁电光子器件对于各种应用(包括光学开关,光学调制,光学计算和光学执行逻辑)将是有用的。