A Dual-Axis Optoelectronic Inclinometer Based on Wavefront Interference Fringes

Hu, Pengcheng; Lin, Xionglei; Zhang, Yifan; Yu, Liang

doi:10.1109/tim.2023.3272378

Cited by 1 publication

(2 citation statements)

References 36 publications

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“…In the level previously proposed by our team [18], a zero-padding and curve-fitting algorithm was adopted. In this algorithm, the signal was first zero padded in the time domain, and then the padded signal was processed by means of FFT and fitting.…”

Section: High-resolution-angle-decoupling Algorithm Based On Zoom Fftmentioning

confidence: 99%

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A Two-Dimensional Precision Level for Real-Time Measurement Based on Zoom Fast Fourier Transform

Fu,

Wang,

Lin

et al. 2023

Micromachines

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This paper proposes a two-dimensional precision level for real-time measurement using a zoom fast Fourier transform (zoom FFT)-based decoupling algorithm that was developed and integrated in an FPGA. This algorithm solves the contradiction between obtaining high resolution and obtaining high measurement speed, and achieves both high angle-resolution measurement and real-time measurement. The proposed level adopts a silicone-oil surface as the angle-sensitive interface and combines the principle of homodyne interference. By analyzing the frequency of the interference fringes, the angle variation can be determined. The zoom-FFT-based decoupling algorithm improves the system’s frequency resolution of the interference fringes, thereby significantly enhancing the angle resolution. Furthermore, this algorithm improves the efficiency of angle decoupling, while the angle decoupling process can also be transplanted to the board to realize real-time measurement of the level. Finally, a prototype based on the level principle was tested to validate the effectiveness of the proposed method. The principle analysis and test results showed that the angle resolution of the prototype improved from 9 arcsec to about 0.1 arcsec using this angle-solution method. At the same time, the measurement repeatability of the prototype was approximately ±0.2 arcsec. In comparison with a commercial autocollimator, the angle measurement accuracy reached ±0.6 arcsec.

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Section: High-resolution-angle-decoupling Algorithm Based On Zoom Fftmentioning

confidence: 99%

“…Previously, our team proposed a dual-axis optoelectronic level based on wave-front interference fringes [18], which can achieve an angle resolution at the sub-microradian level. This level obtained the measured angle by solving the interference fringes.…”

Section: Introductionmentioning

confidence: 99%