An Innovative Dual-Axis Precision Level Based on Light Transmission and Refraction for Angle Measurement

Huang, Yubin; Yang, Fan; Lou, Zhifeng; Fan, Kuang‐Chao; Sun, Wei

doi:10.3390/app10176019

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…Three papers on angle measurement technology were included. An innovative dualaxis precision level based on the light passing through a liquid container was designed and commercialized [21]. It works better than the current commercial levels as it is light weight, has a low cost, and has two axes for pitch and roll error measurement of machine tool stages.…”

Section: Angle Measurementsmentioning

confidence: 99%

Special Issue on Manufacturing Metrology

Fan

Kinnell

2021

Applied Sciences

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Section: Angle Measurementsmentioning

confidence: 99%

Special Issue on Manufacturing Metrology

Fan

Kinnell

2021

Applied Sciences

Self Cite

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“…As the laser beam exits the pentaprism, it is aligned parallel to the first rail through adjusting the laser and the pentaprism. When moving the pentaprism from the first guideway position to the second guideway position, the adjustment is guided by a dual-level sensor [16] integrated to the pentaprism assembly so that its pitch and roll positions are identical to its first guideway position. In result, a laser beam direction the same as for the first rail is established.…”

Section: Parallelism Measurementmentioning

confidence: 99%

Metrology and Measurement Systems

Xu,

Li,

Zhao

et al. 2021

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A laser measurement system for measuring straightness and parallelism error using a semiconductor laser was proposed. The designing principle of the developed system was analyzed. Addressing at the question of the divergence angle of the semiconductor laser being quite large and the reduction of measurement accuracy caused by the diffraction effect of the light spot at the long working distance, the optical structure of the system was optimized through a series of simulations and experiments. A plano-convex lens was used to collimate the laser beam and concentrate the energy distribution of the diffraction effect. The working distance of the system was increased from 2.6 m to 4.6 m after the optical optimization, and the repeatability of the displacement measurement is kept within 2.2 m in the total measurement range. The performance of the developed system was verified by measuring the straightness of a machine tool through the comparison tests with two commercial multi-degree-of-freedom measurement systems. Two different measurement methods were used to verify the measurement accuracy. The comparison results show that during the straightness measurement of the machine tool, the laser head should be fixed in front of the moving axis, and the sensing part should move with the moving table of the machine tool. Results also show that the measurement error of the straightness measurement is less than 3 m compared with the commercial systems. The developed laser measurement system has the advantages of high precision, long working distance, low cost, and suitability for straightness and parallelism error measurement.

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“…Liquid-based levels are usually based on the refraction or reflection of a liquid and combine it with the autocollimation principle to detect the position change of light spots to measure the angle change. Yubin Huang et al from the Dalian University of Technology proposed a dual-axis level based on transmittance and refraction [14]. This method employs liquid as a reflective medium, achieving errors that are better than ±0.6 arcsec within a measurement range of ±100 arcsec and better than ±5 arcsec within a range of ±800 arcsec.…”

Section: Introductionmentioning

confidence: 99%

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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An Innovative Dual-Axis Precision Level Based on Light Transmission and Refraction for Angle Measurement

Cited by 6 publications

References 21 publications

Special Issue on Manufacturing Metrology

Special Issue on Manufacturing Metrology

Metrology and Measurement Systems

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

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