Mr. Yiqing Wang Profile

Yiqing Wang

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Proceedings Article | 3 February 2009 Paper

A detection and control method of resin liquid-level of stereolithography apparatus

Yiqing Wang, Wanhua Zhao, Leping Shi, Bingheng Lu

Proceedings Volume 7160, 716009 (2009) https://doi.org/10.1117/12.819841

KEYWORDS: Liquids, Control systems, Stereolithography, Signal processing, Calibration, Laser sources, Rapid manufacturing, Signal detection, Sensors, Lithium

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A set of laser detecting system for liquid-level with inclination measurement-based high-resolution and a sinking-block device are developed to detect and control the liquid-level of Stereolithography Apparatus precisely. A brightness-variable laser source is adopted to eliminate the computational error of divider, a closed-loop circuit is set to measure the terminal voltage directly which proportional to the output current of PSD, and hence the position of laser beam can be indicated accurately. A sinking-block device is employed to control the liquid level. The precise calibration result of this detecting device indicates that the resolution of the liquid-level detection can reach ±1.5µm. Compared with overflow liquid-level control, this liquid-level control device of sinking-block style can allow the liquid-level wave reduce from ±45µm to ±15µm. This system works stable with the high precision and antijamming ability. It has applied successfully in Stereolithography Apparatus.

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