A coherent imaging device and method
CN122283750BActive Publication Date: 2026-08-28WUHAN INST OF TECH
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Patent Information
- Application Number
- CN202610630558.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2026-05-09
- Publication Date
- 2026-08-28
- Estimated Expiration
- 2046-05-09
AI Technical Summary
Technical Problem
[0005]有鉴于此，有必要提供一种相干成像装置及方法，用以解决现有方式无法实时测量公共路径相位噪声、难以将几何误差与慢变相位漂移解耦校正所导致的相干成像质量差的技术问题
Benefits of technology
[0016]本发明的有益效果是：本发明提供的相干成像方法，通过引入光学频率梳构建参考干涉支路，实时提取参考拍频信号来补偿测量拍频信号，能够直接捕获公共路径上的相位抖动并加以抑制；同时将参考相位噪声映射为扫描器漂移观测量，联合估计几何参数误差与相位漂移误差，再根据估计结果修正几何映射并做精相位补偿，使得原本相互耦合的扫描器偏差和环境慢变漂移得以分开校正，实现跨扫描位置的相位一致性明显提升，有利于提高相干成像的聚焦质量和三维点云的空间准确性，从而提高相干成像的质量。
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Abstract
The application provides a kind of coherent imaging device and method, belong to photoelectric detection and three-dimensional imaging technical field, the device includes: FMCW laser output sweep frequency light;Splitter is divided into sweep frequency light and reference branch sampling light and local branch light of measurement branch light;Measurement interference branch outputs measurement beat frequency signal;Reference interference branch utilizes optical frequency comb output reference beat frequency signal;Digital processing module is based on reference beat frequency signal compensation measurement beat frequency signal and generates scanner drift observation, utilizes the joint estimation of compensation result and drift observation geometric parameter error and phase drift error, according to the estimation result, carries out geometric mapping correction and precision phase compensation, outputs coherent three-dimensional point cloud or coherent detection image.Using the application can improve the phase consistency of coherent imaging and three-dimensional point cloud quality.
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