Published
2026-05-08
Section
Articles
How to Cite
零差式激光多普勒测振系统全链路建模与关键参数影响分析
刘 佳函
东华大学
尚 建华
东华大学
DOI: https://doi.org/10.59429/kxjsyy.v3i2.13851
Keywords: 激光多普勒测振（LDV）；零差干涉；碳纤维增强复合材料（CFRP）；参数影响分析
Abstract
激光多普勒测振（Laser Doppler Vibrometry, LDV）技术凭借非接触、高精度优势，在结构振动测量领域具有重要应用。为定量评估实际系统中非理想因素对测量精度的影响，本文基于相干探测原理构建零差式 LDV 系统全链路数学模型，系统分析激光器噪声、光学混频器相位误差、平衡探测器噪声、望远镜参数及碳纤维增强复合材料（Carbon Fiber Reinforced Polymer, CFRP）反射特性对多普勒频移解调精度的影响。仿真结果表明：光学混频器相位误差需控制在 0.2°以内；平衡探测器总噪声误差小于 0.04%；望远镜接收光功率与孔径直径平方成正比、与测量距离平方成反比；CFRP 表面漫反射引入的散斑噪声可通过提高镜面反射权重因子有效抑制。本文建立涵盖光源、光路、目标反射特性的全链路数值模型，揭示镜面反射权重因子 η 与解调精度的量化关系，为高精度 LDV 系统设计与复合材料无损检测提供理论支撑。
References
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