基于旋转不变技术信号参数估计的激光扫频干涉测量方法

激光扫频干涉测量技术具有无测距盲区、非接触、单次测量多目标的能力.通过傅里叶变换可提取目标拍频频率,进而解算距离.然而受激光器调频带宽限制,通过傅里叶变换得到的目标分辨率受限于固有分辨率.为解决该问题,本文提出采用基于旋转不变技术的信号参数估计(ESPRIT)算法对测量信号进行频谱分析.实验通过插值拟合法校正测量信号拍...

Laser frequency scanning interferometry based on estimating signal parameters via rotational invariance technique

The laser frequency scanning interferometry,as a non-contact method,has non-ranging blind zone and achieves multi-target testing in a single measurement.The beat frequency of target can be extracted by Fourier transform,and then the distance can be solved.However,due to the limitation of laser frequency modulation bandwidth,the resolution of target obtained by Fourier transform is limited to the inherent resolution.In order to solve this problem,in this paper we propose to use the estimating signal parameter via rotational invariance technique(ESPRIT)to perform spectrum analysis on the measured signal.In the experiment,the resampling method is adopted to correct the non-linearity of the measured signal beat frequency,and then the ESPRIT algorithm is used to obtain the target distance.The results show that the Fourier transform algorithm cannot distinguish the target signal from the frequencies of adjacent target,but the ESPRIT algorithm can do.The thickness of the measured target is 2.08 mm.This provides ideas for measuring,such as damage point in the proximity of the fiber,height of thin step,or small hole.