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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