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公开(公告)号:US20060274322A1
公开(公告)日:2006-12-07
申请号:US11142423
申请日:2005-06-01
申请人: David Chu , Lee Kalem , William Schluchter
发明人: David Chu , Lee Kalem , William Schluchter
IPC分类号: G01B11/02
CPC分类号: G01B9/02059 , G01B9/02003 , G01B9/02083
摘要: A method for non-linearity compensating interferometer position data generated from a measurement signal includes generating a first set of non-linearity parameters based on received digital position values. The method includes sensing whether a low velocity condition exists. A first one of the non-linearity parameters is updated based on an estimated magnitude of the measurement signal if the low velocity condition exists. At least one digital position value is compensated based on the updated non-linearity parameter if the low velocity condition exists.
摘要翻译: 从测量信号生成的用于非线性补偿干涉仪位置数据的方法包括基于接收的数字位置值生成第一组非线性参数。 该方法包括检测是否存在低速条件。 如果存在低速条件,则基于测量信号的估计幅度来更新非线性参数中的第一个。 如果存在低速条件,则基于更新的非线性参数来补偿至少一个数字位置值。
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公开(公告)号:US20050062624A1
公开(公告)日:2005-03-24
申请号:US10668851
申请日:2003-09-23
申请人: David Chu , Carol Courville , Lee Kalem
发明人: David Chu , Carol Courville , Lee Kalem
CPC分类号: H03M1/303
摘要: A method of digitizing first and second signals in imperfect quadrature for obtaining characteristic parameters of the first signal comprises providing a first signal, the first signal comprising an inphase quasi-sinusoidal analog signal. The method comprises providing a second signal, the second signal comprising a quadrature signal. The method comprises digitizing the first signal at a sampling rate, thereby generating a first plurality of sets of digital signal waveform samples and digitizing the second signal at the sampling rate, thereby generating a second plurality of sets of digital signal waveform samples. The method comprises digitally processing successive first and second sets of digital signal waveform samples to generate continually updated digital characteristic parameters representing a characteristic behavior of the first signal.
摘要翻译: 数字化不正确正交中的第一和第二信号以获得第一信号的特性参数的方法包括提供第一信号,第一信号包括同相准正弦模拟信号。 所述方法包括提供第二信号,所述第二信号包括正交信号。 该方法包括以采样率对第一信号进行数字化,从而产生第一多组数字信号波形样本,并以采样率对第二信号进行数字化,从而产生第二组多组数字信号波形样本。 该方法包括数字处理连续的第一和第二组数字信号波形样本以产生表示第一信号的特征行为的不断更新的数字特征参数。
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3.
公开(公告)号:US5608523A
公开(公告)日:1997-03-04
申请号:US622650
申请日:1996-03-26
申请人: Lee Kalem , Robert L. Wilson
发明人: Lee Kalem , Robert L. Wilson
IPC分类号: G01B11/00 , G01B9/02 , G01B21/00 , H03K5/1536
CPC分类号: G01B9/02083 , G01B9/0201 , G01B2290/45
摘要: A laser interferometer measurement system eliminates detection of "false" zero crossings in the measurement signal. The measurement signal is shifted in phase by an integrator or a differentiator. The positive portion of the shifted measurement signal is used to determine falling portions of the measurement signal while the negative portion of the shifted measurement signal is used to determine the rising portions of the measurement signal. Each portion is compared to the reference signal. A SR latch receives the result of each comparator. The output signal of the SR latch reflects the zero crossings of the measurement signal without the effects of noise.
摘要翻译: 激光干涉仪测量系统消除了测量信号中“假”过零点的检测。 测量信号由积分器或微分器相位移位。 移位测量信号的正部分用于确定测量信号的下降部分,而移位的测量信号的负部分用于确定测量信号的上升部分。 每个部分与参考信号进行比较。 SR锁存器接收每个比较器的结果。 SR锁存器的输出信号反映了测量信号的过零点,而没有噪声的影响。
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4.
公开(公告)号:US5530542A
公开(公告)日:1996-06-25
申请号:US423236
申请日:1995-04-19
申请人: Lee Kalem , Robert L. Wilson
发明人: Lee Kalem , Robert L. Wilson
IPC分类号: G01B11/00 , G01B9/02 , G01B21/00 , H03K5/1536
CPC分类号: G01B9/02083 , G01B9/0201 , G01B2290/45
摘要: A laser interferometer measurement system eliminates detection of "false" zero crossings in the measurement signal. The measurement signal is shifted in phase by an integrator or a differentiator. The positive portion of the shifted measurement signal is used to determine falling portions of the measurement signal while the negative portion of the shifted measurement signal is used to determine the rising portions of the measurement signal. Each portion is compared to the reference signal. A SR latch receives the result of each comparator. The output signal of the SR latch reflects the zero crossings of the measurement signal without the effects of noise.
摘要翻译: 激光干涉仪测量系统消除了测量信号中“假”过零点的检测。 测量信号由积分器或微分器相位移位。 移位测量信号的正部分用于确定测量信号的下降部分,而移位的测量信号的负部分用于确定测量信号的上升部分。 每个部分与参考信号进行比较。 SR锁存器接收每个比较器的结果。 SR锁存器的输出信号反映了测量信号的过零点,而没有噪声的影响。
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