基于Labview的图像采集与应变场测量系统开发研究

莫迪威 张春良 王文龙 朱厚耀

摘要：介绍基于Labview编写的上位机系统，其中包括自动对焦系统与全场位移检测系统基本原理，以及系统软件与硬件设备的主要结构与工作过程。在该软件系统中集成了实时位移场监测、应变场检测、数据记录、参数调节、对焦、截取 ROI、相机位置控制等功能。控制系统中，以Labview编写的上位机作为主控，Arduino作为下位机，驱动步进电机带动三轴移动平台进行相机位置的控制。全场位移检测系统采用Labview的模板匹配函数获取位移场，并转换成应变场，同时记录数据进行分析。应用该系统进行隐裂牙的微小变形检测，以期检测出牙齿裂纹，并进行连续拍摄实验测试系统的稳定性。试验结果表明，系统具有方便控制以及高精度的特点，且工作时性能稳定可靠，值得在实际工程运用中进行推广。关键词：非接触测量;数字图像相关检测;应变场检测;Labview;监测系统

中图分类号：TP391.41文献标志码：A

文章编号：1009-9492（2021）11-0012-05

开放科学（资源服务）標识码（OSID）：

Development of Image Acquisition and Strain Field Measurement System Based on Labview

Mo Diwei，Zhang Chunliang，Wang Wenlong※，Zhu Houyao

（College of Mechanical and Electrical Engineering， Guangzhou University， Guangzhou 510006， China）

Abstract： The host computer system based on Labview was introduced， including the basic principles of the focus system and the full-field displacement detection system， as well as the main structure and working process of the system software and hardware equipment. The software systemintegratedreal-timedisplacement fieldmonitoring，strain fielddetection，datarecording，parameteradjustment， focusing，ROI interception， camera position control and other functions. In the control system， the upper computer written by Labview was used as the main control， and Arduino was used as the lower computer to drive the stepper motor to drive the three-axis moving platform to control the camera position. The full-field displacement detection system used the template matching function of Labview to obtain the displacement field and convert it into a strain field. At the same time， the data was recorded for analysis. In order to detect tooth cracks， the system was used to detect small deformations of cracked teeth， continuous shooting experiments were taken to test the stability of the system. The test results show that the system has the advantages of convenient control and high precision， convenient operation， stable and reliable performance during work， etc. It is worthy of popularization in practical engineering applications.

Key words： digital image correlation detection; strain field detection; Labview; monitoring system

0 引言

数字图像相关法（DIC）又称数字散斑相关法[1]，是一种现代光学测量技术，具有高精度、非接触、结构相对简单等特点，可用于物体的全场位移或应变检测[2]。根据数字图像相关法的原理，图像处理程序将参考散斑图像与变形散斑图像进行比较，并根据变形前后给定的散斑灰度强度，通过相关计算，获得图像的位移或变形信息[3-4]。

Labview是美国国家仪器（ NI ）公司研发的编程开发环境，集成了工程上常用的工具包，且编程思……