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公开(公告)号：US4663588A
公开(公告)日：1987-05-05
申请号：US634791
申请日：1984-07-26
摘要： A detector head for use in a measuring device includes a plurality of constituent measuring elements arranged in at least two blocks, each block producing an output signal of equal amplitude, and a phase shifter provided to shift the relative phases of the output signals of the blocks to have a predetermined relative phase difference, whereby selected higher-order harmonic components are cancelled from the resultant signal formed by summing the signals produced by the separate blocks of constituent elements.
摘要翻译： 用于测量装置的检测器头包括布置在至少两个块中的多个构成测量元件，每个块产生相等振幅的输出信号，以及移相器，用于移位块的输出信号的相对相位 具有预定的相对相位差，从而通过对由分离的组成元件块产生的信号进行求和而形成的结果信号来消除所选择的高阶谐波分量。
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公开(公告)号：US4309702A
公开(公告)日：1982-01-05
申请号：US14318
申请日：1979-02-23
摘要： Apparatus for detecting the displacement of a member having a magnetic scale on which are provided calibrating signals of a predetermined wavelength. First and second magnetic heads are disposed to reproduce the calibrating signals from the magnetic scale; and these heads also are energized with pulse signals, whereby each of the magnetic heads produces a balanced modulated pulse signal derived from the reproduced calibrating signal and the energizing pulse signal supplied thereto. The balanced modulated pulse signals from the two heads are added to obtain a phase modulated pulse signal. A predetermined higher harmonic of the phase modulated pulse signal is selected; and predetermined increments of phase shift in the selected higher harmonic of the phase modulated pulse signal are detected so as to produce output pulse signals representing corresponding increments of displacement.
摘要翻译： 用于检测具有磁标尺的构件的位移的装置，其被提供有预定波长的校准信号。 第一和第二磁头被设置为再现来自磁标度的校准信号; 并且这些磁头也被脉冲信号激励，由此每个磁头产生从再现的校准信号和提供给它的激励脉冲信号导出的平衡调制脉冲信号。 来自两个磁头的平衡调制脉冲信号相加以获得相位调制脉冲信号。 选择相位调制脉冲信号的预定高次谐波; 并且检测相位调制脉冲信号的所选高次谐波中的相移的预定增量，以便产生表示相应的位移增量的输出脉冲信号。
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