光学学报, 2016, 36 (1): 0112003, 网络出版: 2015-12-31   

扫频干涉测距光频率非线性阶次跟踪抑制方法

Suppression of Nonlinear Frequency Sweep in Frequency Sweeping Interferometer Based on Order Tracking Technique
作者单位
西安交通大学机械制造系统工程国家重点实验室, 陕西 西安 710049
摘要
针对激光频率扫描干涉(FSI)测距系统中激光器输出光频率非线性对测量精度的影响,提出了一种基于非平稳信号阶次跟踪的方法。从频域的角度分析了FSI测距系统中影响测量精度的主要因素。通过检测法布里-珀罗标准具的透射信号,实现对光频率的快速间接测量。利用最小二乘的方法对光频率进行线性拟合,实现对光频率变化率的修正。通过多项式拟合的方法确定光频率的时间-频率数学表达式,构造等频率的间隔点对其逆向插值,获得对应的时间序列。对采样的干涉信号在时间序列处正向插值,重构等频率间隔采样的干涉信号,对重构的干涉信号进行频谱分析,最终得到非平稳干涉信号的干涉频率。结果表明,在不限制待测距离的条件下,利用阶次跟踪的方法,可以有效抑制激光器输出光频率非线性的影响,FSI测距系统的测量精度得到显著提高。在1000 mm 的测量范围内,测量结果的空间分辨率提高了36倍以上。
Abstract
A new method based on order tracking technique for reducing the effect of nonlinear optical frequency swept in frequency sweeping interferometer(FSI) is presented. The main factors affecting the measuring accuracy of the FSI system are discussed in frequency domain. This method utilizes the optical resonant characteristic of a Fabry-Perot etalon to measure the instantaneous optical frequency of a laser rapidly. Carries on the data linear fitting to the optical frequency on the least- square method and make the slope of the linear equation as the correction rate of optical frequency. The time series of equidistant optical frequency grid can be obtained with polynomial fit and interpolation of optical frequency. The interference signal can be resampled according to time series of equidistant optical frequency grid, and then reconstructed by using data interpolation. The frequency value of non-stationary interference signal is achieved after spectral analysis of reconstructed interference signal. The results indicate that this method dramatically reduces the effects of the nonlinear sweep without limit the range of the measured distance, and demonstrates spatial resolution enhancement of more than 36 times in the range of 1000 mm.

刘哲, 刘志刚, 邓忠文, 陶龙. 扫频干涉测距光频率非线性阶次跟踪抑制方法[J]. 光学学报, 2016, 36(1): 0112003. Liu Zhe, Liu Zhigang, Deng Zhongwen, Tao Long. Suppression of Nonlinear Frequency Sweep in Frequency Sweeping Interferometer Based on Order Tracking Technique[J]. Acta Optica Sinica, 2016, 36(1): 0112003.

本文已被 3 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!