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首页> 外文会议>Conference on Lidar technologies, techniques, and measurements for atmospheric remote sensing >Research on the nonlinearity correction method for the piezoelectricoptical scanner in a lidar system
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Research on the nonlinearity correction method for the piezoelectricoptical scanner in a lidar system

机译：激光雷达系统中压电光电扫描器非线性校正方法的研究

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摘要

The laser scanning system of a lidar usually needs a laser scanner with characteristics such as fast linear scanning, small size and small rotational inertia moment. Traditional laser scanners, such as galvanometer and rotating multi-faceted mirror, are difficult to achieve fast linear scanning with low moment of inertia. In order to solve these problems, a piezoelectric optical scanner based on novel piezoelectric actuator is designed in this paper. First of all, the scanner system components based on self-learning feed-forward controller is introduced. Furthermore, the principle and method of amending the scanner hysteresis loop are analyzed. Finally, one-dimensional linear scanning in a wide range of frequencies using the control platform with the core of digital signal processor TMS320F2812 is achieved. The experimental results show that the hysteresis characteristics have been restrained and scanning linear performance of the piezoelectric optical scanner has been remarkably improved in low frequencies. In high frequencies, the nonlinearity of triangle wave scanning is reduces by adding a notch filter circuit which restrained the structure resonance of the scanner. The piezoelectric optical scanner also has other advantages such as large optical scanning angle, high first step resonance frequency, small size and simple structure.
机译：激光雷达的激光扫描系统通常需要具有诸如快速线性扫描，小尺寸和小转动惯量的特征的激光扫描仪。传统的激光扫描仪，例如振镜和旋转多面镜，很难实现具有低惯性矩的快速线性扫描。为了解决这些问题，本文设计了一种基于新型压电致动器的压电光学扫描仪。首先，介绍了基于自学习前馈控制器的扫描仪系统组件。此外，分析了修改扫描仪磁滞回线的原理和方法。最后，使用以数字信号处理器TMS320F2812为核心的控制平台，实现了在宽频率范围内的一维线性扫描。实验结果表明，在低频情况下，磁滞特性得到了抑制，压电光学扫描仪的扫描线性性能得到了显着改善。在高频下，通过添加陷波滤波器电路来减少三角波扫描的非线性，陷波滤波器电路会限制扫描仪的结构共振。压电光学扫描器还具有其他优点，例如大的光学扫描角，高的第一步共振频率，小的尺寸和简单的结构。

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