变温条件下的红外偏振BRDF快速测量系统  

Infrared Polarized BRDF Rapid Measurement System at Variable Temperatures

作　　者：黄昂 王景辉[1] 董伟[1] 孟凡山 黄帅 李益文[3] 冯国进[4] HUANG Ang;WANG Jing-hui;DONG Wei;MENG Fan-shan;HUANG Shuai;LI Yi-wen;FENG Guo-jin(Division of Thermo-physics Metrology,National Institute of Metrology,Beijing 100029,China;College of Mechanical and Transportation Engineering,China University of Petroleum,Beijing,Beijing 102249,China;Science and Technology on Plasma Dynamic Laboratory,Airforce Engineering University,Xi'an 710038,China;Division of Optical Metrology,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院热工计量科学研究所,北京100029 [2]中国石油大学(北京)机械与储运工程学院,北京102249 [3]空军工程大学等离子体动力学实验室,陕西西安710038 [4]中国计量科学研究院光学计量科学研究所,北京100029

出　　处：《光谱学与光谱分析》2025年第3期650-657,共8页Spectroscopy and Spectral Analysis

基　　金：国家科技重大专项(J2019-V-0008-0102-003);国家重点研发专项-人工智能多模态感知关键计量测试技术研究项目(2021YFF0600204);中国计量科学研究院基本科研业务费(AKYZZ2306,AKYZD2310);陕西省杰出青年科学基金项目(2022JC-29)资助。

摘　　要：在变温条件下的红外偏振BRDF能准确反映材料表面的辐射特性,为表面光学特性研究提供基础数据,在热成像和红外目标检测等领域有广泛的应用前景。然而,目前的偏振BRDF测量系统主要采用离散逐点扫描方式,单角度扫描时间在5 min以上,完整BRDF测量时间达数小时,并且分辨率较低。在应用于变温测量时,需要长时间保持样品表面的高温,这会导致能耗增加且实施困难。因此,迫切需要研究快速测量方法。研制一套可实现室温~1000℃便携式样片加热的红外偏振BRDF测量系统,克服机械臂的负载和耐温问题。针对研制系统构建测量模型,并提出一种基于机械臂的偏振BRDF连续扫描方法,通过机械臂离散转动-环轨连续扫描和环轨离散转动-机械臂连续扫描两种方式实现不同偏振态下的三维BRDF快速连续测量,在提高测量速度的同时提高了测量分辨率,单角度扫描时间在1 min以内,完整BRDF测量时间缩短至约1 h,更适用于变温BRDF测量。将所提出的测量方法应用于镜面反射较强的磨砂不锈钢样片表面变温BRDF测量,针对强反射位置附近进行精细连续扫描,获得6.1×10^(-6)、1.37×10^(-5)和3.81×10^(-5) sr三种探测立体角度下的局部偏振BRDF三维分布。立体角越大,空间滤波效果越强,显现出更小的测量峰值,这与BRDF理论测量模型相吻合。因此,在进行强镜面反射材料的BRDF测量时,需要采用小立体角探测,减小空间滤波效应,不锈钢样片测量采用6.1×10^(-6) sr的立体角。在变温实验中,当温度升高时,不锈钢样片表面发生氧化反应,S和P偏振BRDF峰值均随温度升高而降低,两个偏振态下的最大测量标准差相比于BRDF平均值占比分别为0.56%和0.24%,不同温度下BRDF测量重复性较好,且两者变化趋于一致,说明了研制系统的偏振BRDF测量的有效性。Infrared-polarized BRDF at variable temperatures can accurately reflect the radiation characteristics of the material surface,provide basic data for studying the optical properties of the surface,and have a wide range of applications in thermal imaging and infrared target detection.However,existing polarized BRDF measurement systems mainly use a discrete point-by-point scanning strategy,with a single-angle scanning time of more than 5 minutes and a complete BRDF measurement time of several hours,and the resolution is relatively low.When BRDF systems are applied to variable temperature measurements,high temperatures must be maintained on the sample surface for a long time,which leads to increased energy consumption and is difficult to implement.Therefore,there is an urgent need to investigate fast measurement methods.In this work,an infrared polarization BRDF measurement system with a portable sample heater from room temperature to 1000℃was developed,and the mechanical arm s load and temperature resistance problems were overcome.A continuous scanning method of polarized BRDF based on a robotic arm was proposed.Fast and continuous 3D BRDF measurements in different polarization states were realized in two ways:discrete rotation of the robotic arm with continuous scanning of the rotary table and discrete rotation of the rotary table with continuous scanning of the robotic arm,improving the measurement speed and resolution.The single-angle scanning time was less than 1 minute,and the complete BRDF measurement time was shortened to about 1 hour,which is more suitable for variable-temperature BRDF measurements.The developed system was applied to measure the BRDF of a frosted stainless steel sample with a high specular reflection surface at variable temperatures.The area of strong reflections was finely scanned continuously,and three-dimensional distributions of polarized BRDF at three solid angles of 6.1×10^(-6),1.37×10^(-5),and 3.81×10^(-5) were obtained.The larger the solid angle,the stronger the spatial filterin

关 键 词：双向反射分布函数 偏振测量 变温环境 红外反射 

分 类 号：O439[机械工程—光学工程]