基于激光和机器视觉的微量液体容量计量方法

针对玻璃量器的液体容量计量,提出一种基于激光和机器视觉技术的液位测量方法。建立了标准玻璃量器液位高度和容量对应关系的容积表,通过测量得到液位高度就能得到对应的液体体积值;采用数字图像处理等技术,使用高精度摄像头和图像处理软件,提取特征元素,实现玻璃量器中液体体积的高精度测量。设计了和静力衡量法的比对试验进行方法验证,对于100mL的玻璃量器,测量装置引用误差优于0.2%,拟合算法的扩展不确定度为0.137%(k=2),测量重复性为0.08%。

Volume Metrology Method for Micro Liquid Based on Laser and Machine Vision

For the liquid volume measurement of volumetric glass gauge, a liquid level measurement method for micro liquid volume based on laser and machine vision technology was proposed. A volume table for correspondence relationship of liquid level and capacity in the standard glass gauge was established. The corresponding value of liquid volume can be obtained by measuring the liquid level. Measuring the liquid level of the standard glass gauge is the main point in the method. Liquid level measurement combined with computer and digital image processing technology, and used high-resolution camera and image processing software to extract feature element. High-precision volume measurement was realized, a comparative test with the static measure method was also designed, and validated the method. For the 100mL glass container, the measuring accuracy is better than 0.2%, the expanded uncertainty of the fitting algorithm is 0.137% (k=2), and the repeatability of measurement is 0.08%.