地质露头激光扫描反射强度外部干扰因素研究  

Research on external interference factors of laser scanning reflection intensity in geological outcrop

作　　者：蒋梦月 邵燕林[1] 曾齐红[2] 魏薇[1] 邓帆 胡忠贵[1] JIANG Mengyue;SHAO Yanlin;ZENG Qihong;WEI Wei;DENG Fan;HU Zhonggui(School of Geosciences,Yangtze University,Wuhan 430000,China;Petro China Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]长江大学地球科学学院,武汉430000 [2]中国石油勘探开发研究院,北京100083

出　　处：《激光杂志》2023年第3期81-86,共6页Laser Journal

基　　金：湖北省教委科研基金(No.2018289);湖北省高等学校实验室研究项目(No.HBSY2018-28);受中石油科技项目“重点地区数字露头勘查技术研究应用”(No.KT2021-06-14)资助。

摘　　要：地质露头激光反射强度不仅受控于扫描仪特性,露头物质组成和结构特征,还受大气环境、扫描几何条件等外部因素干扰,导致露头上“同物异值,异物同值”。针对地质露头激光扫描时反射强度的外部干扰因素开展研究,从扫描距离、入射角、水浸和环境温度四方面设计实验方案,运用对比分析方法。得出:距离对反射强度存在显著影响,且不同型号扫描仪近距离效应和受影响程度不同;入射角的影响随岩石表面粗糙程度的不同而表现出较大差异;水能吸收近红外激光,致使水浸后的强度值降低;强度值对环境温度变化不敏感。基于研究认识,针对地质露头野外扫描作业的特征,提出了地质露头野外采集技术规范,以降低扫描时的外部干扰,提高数据采集质量。The laser reflection intensity of the geological outcrop is not only controlled by scanner characteristics,outcrop mineral composition and structural feature,but also interfered by the atmospheric environment,scanning geometric conditions and other external factors,resulting in"same object with different intensity value,foreign object with the same intensity value"in the outcrop.This paper studies the external interference factors of the reflection intensity in the laser scanning process of geological outcrops,designs experimental schemes from four aspects:scanning distance,incident angle,water immersion,and ambient temperature,and uses comparative analysis methods to study.The study shows that the distance has a significant effect on the reflection intensity,the proximity effect and degree of impact of different scanner models are different;the incident angle influence varies greatly with the rock surface roughness;water can absorb the near-infrared laser,which reduces intensity value after immersion;and the intensity value is not sensitive to the ambient temperature change.Based on the research understanding,according to the characteristics of geological outcrop field scanning operation,the technical specifications for geological outcrop field collection are proposed,so as to reduce external interference during scanning and improve the quality of data collection.

关 键 词：地面三维激光扫描 激光反射强度 地质露头 干扰因素 

分 类 号：TN249[电子电信—物理电子学]