19-picometer mechanical step displacement measurement using heterodyne interferometer with phase-locked loop and piezoelectric driving flexure-stage
19-picometer mechanical step displacement measurement using heterodyne interferometer with phase-locked loop and piezoelectric driving flexure-stage
复制标题
使用锁相环和压电驱动挠曲台外差干涉仪进行 19 皮米机械步进位移测量
DOI:
10.1016/j.sna.2020.111880
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Masato Aketagawa
中科院分区:
文献类型:
--
作者:
Thanh Dong Nguyen;Quang Anh Duong;Masato Higuchi;Thanh Tung Vu;Dong Wei;Masato Aketagawa
In this paper, we discuss 20-picometer-order mechanical step displacement measurements using a heterodyne interferometer with a phase-locked loop (PLL) and two piezoelectric (PZT) driving flexure-stages. First, the phase meter for heterodyne interferometry using one simple digital PLL is developed. Two inputs and one output of the single PLL are the reference and measurement signals of the heterodyne interferometer and the phase shift due to the movement of the target mirror, respectively. The PLL includes an active phase shifter, a mixer (multiplier), a low-pass filter combined with an averaging operation, and an integrator. In electronics evaluation of the PLL, the PLL shows a phase resolution of 174 μrad with 4.2 μrad noise (standard deviation) and a phase noise floor of 3 μrad/√Hz above 0.2 Hz with an output sampling rate of 200 Hz. Using the single PLL, a four-pass normal commercial heterodyne interferometer, and high-stiff-parallel spring stage driven by PZT actuator, we demonstrate the actuations and measurements of mechanical step displacements of 19 pm (1.5 mrad) and a displacement noise floor of 1.1 pm/√Hz (90 μrad/√Hz) above 1 Hz in normal air. In the paper, the principle, instrumentation, and experimental results are discussed.
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影响因子:
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DOI:
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发表时间:
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期刊:
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