High-precision self-adaptive phase-calibration method for wavelength-tuning interferometry

Zhu, Xueliang; Zhao, Huiying; Dong, Longchao; Wang, Hongjun; Liu, Bingcai; Yuan, Daocheng; Tian, Anmin; Wang, Fangjie; Zhang, Chupeng; Ban, Xinxing

doi:10.1088/1361-6501/aa58b8

Cited by 4 publications

(2 citation statements)

References 14 publications

(16 reference statements)

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“…Therefore, there inevitably exists some systematic errors in the phase difference between the nodes. To improve the phase difference measurement accuracy, a calibration is made based on the phase frequency characteristics of the sensors [25,26].…”

Section: The Principle Of High Precision Time-difference Informatimentioning

confidence: 99%

A Method of FPGA-Based Extraction of High-Precision Time-Difference Information and Implementation of Its Hardware Circuit

Yan

et al. 2019

Sensors

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The positioning technology to find shallow underground vibration sources based on a wireless sensor network is receiving great interest in the field of underground position measurements. The slow peaking and strong multi-waveform aliasing typical of the underground vibration signal result in a low extraction accuracy of the time difference and a poor source-positioning accuracy. At the same time, the transmission of large amounts of sensor data and the host computer’s slow data processing speed make locating a source a slow process. To address the above problems, this paper proposes a method for high-precision time-difference measurements in near-field blasting and a method for its hardware implementation. First, based on the broadband that is typical of blast waves, the peak frequency of the P-wave was obtained in the time–frequency domain, taking advantage of the difference in the propagation speed of the P-wave, S-wave, and the surface wave. Second, the phase difference between two sensor nodes was found by means of a spectral decomposition and a correlation measurement. Third, the phase ambiguity was eliminated using the time interval of the first break and the dynamic characteristics of the sensors. Finally, following a top-down design idea, the hardware system was designed using Field Programmable Gate Array(FPGA). Verification, using both numerical simulations and experiments, suggested that compared with generalized cross-correlation-based time-difference measurement methods, the proposed method produced a higher time-difference resolution and accuracy. Compared with the traditional host computer post-position positioning method, the proposed method was significantly quicker. It can be seen that the proposed method provides a new solution for solving high-precision and quick source-location problems, and affords a technical means for developing high-speed, real-time source-location instruments.

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Section: The Principle Of High Precision Time-difference Informatimentioning

confidence: 99%

A Method of FPGA-Based Extraction of High-Precision Time-Difference Information and Implementation of Its Hardware Circuit

Yan

et al. 2019

Sensors

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“…However, the surface accuracy of optical components is generally determined as the measured difference between the component surface and a flat reference mirror employed in the interferometer system. erefore, the accuracy of interferometry measurements is limited by the surface accuracy of the reference mirror, and the impact of reference mirror surface errors on the measurement results is not negligible when the surface accuracy of the reference mirror resides at a comparable level to that of the optical component [2,3]. Accordingly, the influence of gravity-induced deformation of the reference mirror cannot be ignored in subnanometer scale measurements.…”

Section: Introductionmentioning

confidence: 99%

Multiposition Rotation Interference Absolute Measurement Method for High-Precision Optical Component Surfaces

Zhu

Nie

Liu

et al. 2021

International Journal of Optics

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Modern optical engineering requires increasingly sophisticated interferometry methods capable of conducting subnanometer scale measurements of the large aperture, high-precision optical component surfaces. However, the accuracy of interferometry measurement is limited to the accuracy with which the surface of the reference mirror employed in the interferometer system is known, and the influence of gravity-induced deformation cannot be ignored. This is addressed in the present work by proposing a three-flat testing method based on multiposition rotation interference absolute surface measurement technology that combines the basic theory of N-position rotation with the separability of surface wavefront functions into sums of even and odd functions. These functions provide the rotational symmetric components of the wavefront, which then enables the absolute surface to be reconstructed based on the N-position rotation measurements. In addition, we propose a mechanical clamping combined with computational method to compensate for the gravity-induced deformations of the flats in the multiposition rotation absolute measurements. The high precision of the proposed absolute surface measurement method is demonstrated via simulations. The results of laboratory experiments indicate that the combination compensation method provides the high-precision surface reconstruction outcomes. The present work provides an important contribution for supporting the interferometry measurement of large aperture, high-precision optical component surfaces.

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Wavelength-tuning multiple-surface interferometric analysis with compression of Zernike piston phase error

et al. 2021

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High-precision self-adaptive phase-calibration method for wavelength-tuning interferometry

Cited by 4 publications

References 14 publications

A Method of FPGA-Based Extraction of High-Precision Time-Difference Information and Implementation of Its Hardware Circuit

A Method of FPGA-Based Extraction of High-Precision Time-Difference Information and Implementation of Its Hardware Circuit

Multiposition Rotation Interference Absolute Measurement Method for High-Precision Optical Component Surfaces

Wavelength-tuning multiple-surface interferometric analysis with compression of Zernike piston phase error

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