Development of High-Resolution Liquid-Level Laser Detecting System for Stereolithography Apparatus

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Development of High-Resolution Liquid-Level Laser Detecting System for Stereolithography Apparatus

更新时间：2025-07-09

- Development of High-Resolution Liquid-Level Laser Detecting System for Stereolithography Apparatus
- Vol. 42, Issue 11, Pages: 1394-1397(2008)
- 作者机构：
  
  西安交通大学机械制造系统工程国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TP391
- Online First：10 November 2008，
  
  Published：2008
- 稿件说明：
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Development of High-Resolution Liquid-Level Laser Detecting System for Stereolithography Apparatus[J]. 2008, 42(11): 1394-1397.
DOI：

Development of High-Resolution Liquid-Level Laser Detecting System for Stereolithography Apparatus[J]. 2008, 42(11): 1394-1397. DOI：

摘要

为了精确控制光固化快速成型的树脂液位

开发了基于倾角测量原理的高分辨激光液位检测系统.系统中采用亮度可变的激光源

克服了除法器的运算误差

通过闭环控制回路

测量出正比于位置传感器(PSD)输出电流的端电压

由此可精确地反映出光束位置.采用交流调制激光分离背景光和暗电流

不仅提高了PSD的检测敏感度

而且有效地消除了杂散光和暗电流对检测精度的影响.经过检测系统的精度标定

高分辨激光液位检测系统在液位为1～7 mm的变化范围内

分辨率可以达到1.5 μm.

Abstract

A set of inclination measurement-based high-resolution liquid-level laser detecting system is developed to detect the liquid-level of stereolithography apparatus

where a brightness-variable laser source is adopted to remove the computational error of divider

and a closed-loop circuit is set to measure the terminal voltage directly proportional to the output current of position sensitive device and hence the position of laser beam can be accurately indicated. An AC-modulated laser enables to separate background light and dark current to effectively eliminate the influence of stray light and dark current on the detection accuracy. By means of the precision calibration of detecting system

the resolution of this system can reach to 1.5 μm in the liquid-level varying range of 1-7 mm.

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references

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