量块中心长度绝对测量中干涉条纹的自动判读-《南京理工大学学报》（自然科学版）

文章信息/Info

Title:: Automatic Interference Fringes Processing in the Absolute Measurement of Central Length of Gauge Block

作者:: 葛爱明; 陈进榜; 陈磊; 蒋秀兰¹; 傅云霞¹; 南京理工大学电子工程与光电技术学院, 南京210094
¹ 上海市计量测试技术研究院, 上海200040

Author(s):: GeAiming ChenJinbang ChenLei JiangXiulan ① FuYunxia ①; School of Electronic Engineering & Optoelectric Technology,NUST,Nanjing 210094)

Keywords:: gauge block; measurement; laser interferometry; interference fringes integer; interference fringe f ract ion

摘要:: 利用高分辨率的图像采集系统读取干涉条纹 ,是提高量块长度测量准确度的前提条件。该文介绍利用激光干涉与数字图像处理技术以及应用快速傅里叶变换 (FFT)分析干涉条纹方法 ,分析并解决量块中心长度的自动测量。系统采用了2个频率稳定的激光器 ,提高了视场照度和相干强度。分别在 2种波长下 ,自动测量量块中心干涉条纹小数部分。仪器由CCD摄取干涉条纹 ,计算机计算量块中心干涉条纹的位置。该方法不但提高仪器的自动化程度 ,而且能够提高测量精度。

Abstract:: Using high resolut ion imag e sampling system to recognize interference f ringes is the premise of improving the measurement accuracy of gauge block length. Based on laser interference, digital image processing technology and the FFT method, this paper analyzes and solves the problems on automat ic interference fringe processing in absolute measurement of central length of gauge block. T he system makes use of two frequency stabilised lasers to increase the i-l luminance and coherence st reng th. The fract ions of cent ral fring e of gauge blocks w ere measured automat ically at the tw o w avelengths, the interference f ringes w ere photographed w ith a CCD camera and the cent ral f ringe’ s posit ions w ere calculated w ith a computer. The method has the instrument more automatized and provides hig her accuracy in measurement as w ell.