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Yunfei Zhang

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Proceedings Article | 28 December 2010 Paper

Factorial tests for the air beam assisted form error in-process optical measurement

Y. Zhang, Y. Gao, K. Li

Proceedings Volume 7544, 754402 (2010) https://doi.org/10.1117/12.885879

KEYWORDS: Astatine, Optical testing, Process control, CCD cameras, Lanthanum, Error analysis, Calibration, Sensors, Transmittance, Image processing

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Form error in-process optical measurement is to provide feedback during a machining process for precision control. Based on the method of water beam assisted form error in-process optical measurement, a new air beam approach was proposed to solve the problems of coolant dilution and optical transmittance through multiple media. In order to identify key parameters to reduce the workload of experimental tests, a factorial test was conducted on transparent window size A_t and stability est. Calibration and assessment of A_t and e_st were introduced. Factorial test design was also examined. Results of the study show that v_t, v_a, and d_a are the key parameters on A_t. Although all 6 main parameters are not significant, vt is relatively more important on est. When v_t increases, A_t will decrease. When v_a or d_a increases, A_t will increase. The findings agree with our understanding of the physical process of fluid flow. When v_t decreases, the transparent window size stability e_st will be better. Consider both stability e_st and air velocity v_a, Run 11 should be the best choice of conditions for A_t. A larger transparent window size At typically gives better transparent window size stability e_st. To achieve a balance between e_st and v_a, a suitable size of transparent window at A_t=~30 mm² should be a good choice. Further studies are necessary to confirm the findings.

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