新型光学对中自动测量装置的设计

Automatic measuring device for optical alignment based on color linear CCD

摘要:

针对光学对中器采用面阵电荷耦合器件或者黑白线阵电荷耦合器件作为图像传感器的不足,设计了一种新型光学对中自动测量装置。测量装置由N型自发光目标、光学镜头、彩色线阵电荷耦合器件、处理电路、FPGA和电源模块组成。利用彩色线阵电荷耦合器件和N型自发光目标协同工作进行二维位置测量。通过实验,验证该装置在露天环境下工作,反射光等强干扰时,能区分有用目标信号和干扰信号。论文着重介绍了彩色线阵电荷耦合器件图像传感器的优点和N型自发光目标的尺寸设计。最后,对新型光电对中器的测量精度进行了实验验证和误差分析。在本设计中,图像传感器的选择分别采用黑白线阵CCD和彩色线阵CCD进行实验验证, X轴方向测量精度: ±0.649mm≤1.597mm；Y轴方向测量精度：±1.176mm≤3.940mm。实验结果表明：采用彩色线阵电荷耦合器件作图像传感器时,抗干扰性强,测量结果精确、稳定。

Abstract:

A new type of optical centering automatic measurement device was designed for the lack of planar array charge-coupled devices or black-and-white linear array charge-coupled devices as image sensors for optical alignment devices. The measuring device consists of an N-type self-emission target, an optical lens, a color line array charge-coupled device, a processing circuit, an FPGA, and a power supply module. Two-dimensional position measurement was performed by using color line array charge-coupled devices and N-type self-emission targets to work together. Through experiments, it was verified that the device can distinguish between useful target signals and interference signals when it is operated in open air environment and reflected light and other strong interference. This paper focuses on the advantages of the image sensor of the color linear array charge-coupled device and the size design of the N-type self-luminous target. Finally, the experimental verification and error analysis of the measurement accuracy of the new photoelectric centering device were carried out. In this design, the selection of the image sensor uses black and white linear array CCDs and color linear array CCDs for experimental verification. The accuracy in the X-axis direction is ±0.649mm≤1.597mm; the accuracy in the Y-axis direction is ±1.176mm≤3.940mm. The experimental results show that when a color line array charge coupled device is used as an image sensor, the anti-interference performance is strong, and the measurement result is accurate and stable.