基于二维运动的应力分布测量系统的设计

Design of Stress Distribution Measurement System Based on Two-dimensional Motion

为了克服传统应力测量不能实现对光学元件应力分布的全局测量的问题,该文提出了一种应力自动测试系统。该系统通过双弹光调制光路产生调制信号,经FPGA中的数字锁相技术实现解调后传输到上位机中计算出相关的应力参数。同时又加入了二维运动平台来实现待测样品的运动,进而实现对待测样品每个位置都能进行测量。最终上位机将各点的应力参数结合二维平台运动的位置参数绘制出二维显示图,实现了对样品应力测量的二维可视化显示。根据实验结果,测量的相对误差为0.5%,并能直观地展示应力分布。该测试系统的弹光调制信号、二维运动参数信号和数据处理都由上位机软件进行控制,实现了光机电一体化,具有良好的实际应用价值。

In order to overcome the traditional stress measurement can not achieve the global measurement of the stress distribution of optical elements,an automatic stress measurement system is proposed in this paper.The system generates modulation signal through double elastic optical modulation optical path,demodulates it by digital phase lock technology in FPGA,and then transmits it to the upper computer to calculate relevant stress parameters.At the same time,a two-dimensional motion platform is added to realize the movement of the sample to be measured,so that each position of the sample to be measured can be measured.Finally,the upper computer will draw a two-dimensional display diagram by combining the stress parameters of each point with the position parameters of the two-dimensional platform movement,which realizes the two-dimensional visual display of the sample stress measurement.According to the experimental results,the relative error of measurement is 0.5%,and the stress distribution can be displayed intuitively.The elastic optical modulation signal,two-dimensional motion parameter signal and data processing of the test system are controlled by the upper computer software,which realizes the optical electromechanical integration and has good practical application value.