小视场大范围坐标测量方法

doi:10.3901/JME.2018.10.029

机械工程学报 ›› 2018, Vol. 54 ›› Issue (10): 29-35.doi: 10.3901/JME.2018.10.029

小视场大范围坐标测量方法

赵敏, 刘月婵, 黄秋红, 朱凌建

西安理工大学机械与精密仪器工程学院西安 710048

收稿日期:2017-07-15 修回日期:2017-12-12 出版日期:2018-05-20 发布日期:2018-05-20
通讯作者: 赵敏(通信作者),女,1975年出生,博士,副教授,硕士研究生导师。主要研究方向为视觉测量、坐标测量。E-mail:zhaomin1973@xaut.edu.cn
基金资助:
国家自然科学基金（51405382，51305346）和陕西省教育厅项目（2010JC16）资助项目。

Wide Range Coordinate Measurement Method under Small Field of View

ZHAO Min, LIU Yuechan, HUANG Qiuhong, ZHU Lingjian

School of Mechanical Instrumental Engineering, Xi'an University of Technology, Xi'an 710048

Received:2017-07-15 Revised:2017-12-12 Online:2018-05-20 Published:2018-05-20

摘要/Abstract

摘要： 靶标成像法存在高分辨率与大范围不能兼顾的难题。提出基于编码靶标成像的小视场坐标测量新方法，利用视觉测量获取编码靶标局部信息，依据靶标的全息性即可获得靶标端点的位置信息，实现相对大范围的坐标测量。设计出编码靶标，采用红外光点组合编码，只要成像视场大于3个编码间距即可正确解码和测量。建立系统测量模型，仿真分析了系统主要参数与测量精度的关系，构建优化的测量系统。定点测量和距离测量试验和数据证明了通过获取编码靶标的局部信息可以实现高精度坐标测量。仿真和试验表明，采用编码靶标测量，不仅利用较小视场实现较大范围内的高精度测量，而且利用视场内尽可能大范围的光点参与计算提高测量精度，编码靶标方法显著优于普通靶标方法。利用编码靶标的全息特点扩大测量范围而并不损失测量的分辨率，可以解决视觉测量中大范围与高分辨率不能兼顾的矛盾，为视觉坐标测量提供新思路，具有后续研究价值和实际应用价值。

关键词: 编码靶标, 精度, 小视场, 坐标测量

Abstract: There is a conflict between wider range and higher resolution in the target imaging method. The new coordinate measurement method of coding target imaging under small field of view is introduced. The local information of the coding target is obtained by visual measurement, then the position information of the target endpoint is acquired by holographic property of coding target, and then coordinate measurement of relatively wider range is achieved. The coding target is designed, coding by infrared spot. The coding target can be correctly decoded if the field of view is greater than 3 code distances. The system measurement model is established, then the relationship between main parameters and measuring accuracy is analyzed on simulation, and then the optimized measurement system is built. Fixed point measurement and distance measurement experiment and data prove that high precision coordinate measurement can be achieved through acquiring the local information of the coding target. The simulation and experiment prove that the method with coding target significantly outperforms a method with normal target. With the coding target method, the high precision measurement in a relatively wider range is realized under small field of view, and light spot of the range as wide as possible is utilized into calculation for improving precision. The measurement resolution would not lose when the measurement range is extended by taking advantage of the holographic property of coding target. The contradiction between wider scope and higher resolution in visual measurement is solved. A new idea for visual coordinate measurements is provided. As a result, this method is valued to be further studied and taken into practice.

Key words: coding target, coordinate measurement, precision, small field of view

中图分类号:

TH741

赵敏, 刘月婵, 黄秋红, 朱凌建. 小视场大范围坐标测量方法[J]. 机械工程学报, 2018, 54(10): 29-35.

ZHAO Min, LIU Yuechan, HUANG Qiuhong, ZHU Lingjian. Wide Range Coordinate Measurement Method under Small Field of View[J]. Journal of Mechanical Engineering, 2018, 54(10): 29-35.

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小视场大范围坐标测量方法

Wide Range Coordinate Measurement Method under Small Field of View

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